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Fiber component and laser device

Tue, 15 Dec 2015 08:00:00 EST

The fiber component of the present invention has a fusion splice section for connecting optical fibers. The optical fiber as the receiver of transmitted light is coated with at least two-layer resin. In the vicinity of the fusion splice section for connecting optical fibers, the innermost layer of a resin-coat section is uncovered with other resin coat at the boundary between the resin-coat section and resin-coat removed section of the optical fiber coated with two-layer resin. The structure effectively releases light and suppresses increase in temperature of the resin-coat section, protecting the optical fibers from burn-out.



Ferrule and ferrule with optical fiber

Tue, 23 Jun 2015 08:00:00 EDT

Provided is a ferrule which includes a positioning mechanism configured to position an optical fiber having a predetermined outer diameter, and a recess configured for an adhesive to be disposed therein and having a first inner wall from which a front end of the optical fiber portion positioned by the positioning mechanism is protrudable, and a second inner wall opposite to the first inner wall. A distance between the first inner wall and the second inner wall is less than or equal to four times the outer diameter of the optical fiber.



Optical transceiver having an extra area in circuit board for mounting electronic circuits

Tue, 26 May 2015 08:00:00 EDT

An optical transceiver of one embodiment includes a transmitter optical subassembly to transmit an optical signal, a receiver optical subassembly to receive an optical signal, a mother board, a daughter board, and a housing. The mother board mounts electronic circuits that electrically communicate with the optical transmitter optical subassembly and the receiver optical subassembly. The daughter board mounts other electronic circuits that electrically communicate with the optical transmitter optical subassembly and the receiver optical subassembly. The daughter board has an extra area mounting a portion of the other electronic circuits. The housing defines a space for installing the optical transmitter optical subassembly, the receiver optical subassembly, the mother board, and the daughter board. The extra area is disposed outside the space.



Platforms and systems for fiber optic cable attachment

Tue, 26 May 2015 08:00:00 EDT

Platforms for connecting fiber optic cable assemblies to fiber optic equipment using a universal footprint are disclosed. In one embodiment, a platform for connecting at least one fiber optic cable assembly to fiber optic equipment includes a coupling surface having at least one cable engagement feature, wherein the at least one cable engagement feature is configured to couple the at least one fiber optic cable assembly to the coupling surface, and a plurality of plate engagement features configured to be removably coupled to a plurality of equipment engagement features positioned on the fiber optic equipment. Fiber optic cable assembly coupling systems for coupling fiber optic cable assemblies to fiber optic equipment are also disclosed.



Collapsible cable reel

Tue, 26 May 2015 08:00:00 EDT

A collapsible cable reel comprising a frame assembly having with a first end and a second end and at least one cable support is disclosed. A first end assembly releasably connects to the first end of the frame assembly and a second end assembly releasably connects to the second end of the frame assembly. At least one cable support extends from the frame assembly to the first end assembly and is adapted to support a length of cable wound around the collapsible cable reel. The length of the at least one cable support and the frame assembly are shortenable allowing the first end assembly to move closer to the second end assembly and the collapsible cable reel to move from a first position to a second position.



Cable spool assembly

Tue, 26 May 2015 08:00:00 EDT

A spool assembly includes a drum having a first axial end and an oppositely disposed second axial end. The drum includes an inner surface that defines a bore that extends through the first and second axial ends. A drum support is disposed in the bore of the drum. The drum support includes a first end and an oppositely disposed second end. The drum support has an exterior surface. The exterior surface of the drum support and the inner surface of the drum define a plurality of channels. A first flange is engaged to the first end of the drum support. A second flange is engaged to the second end of the drum support.



Switch rack system

Tue, 26 May 2015 08:00:00 EDT

In one embodiment, the system comprises: (a) a chassis; (b) one or more cards mounted in the chassis, each card having a plurality of switch ports, the plurality of switch ports being aligned in one or more columns; (c) an aggregator mounted adjacent the chassis, the aggregator having a plurality of bays, each bay being aligned with a card in the chassis, at least one of the bays having a faceplate comprising at least first and second aggregator ports aligned in a column; (d) at least first and second hydras, wherein each hydra comprises at least (i) a first connector; (ii) a plurality of second connectors; (iii) a plurality of conductors, each conductor connecting the first connector to one of the second connectors, the plurality of conductors being bundled together to form a trunk portion from the first connector to a breakout point, the plurality of conductors being separated into breakout portions from the breakout point to the second connectors; (iv) wherein the trunk portion of the first cable is longer than that of the second cable; and (e) wherein the first connector of the first hydra is connected to the first aggregator port and the second connectors of the first hydra are connected to a first set of switch ports, and the first connector of the second hydra is connected to the second aggregator port and the second connectors of the second hydra are connected to a second set of switch ports, wherein the first set of switch ports are further away from the aggregator than the second set of switch ports.



Bare glass fiber holder

Tue, 26 May 2015 08:00:00 EDT

A fiber holder is provided which includes first and second holder plates having first and second main surfaces, respectively. The first holder plate includes a first channel insert including a first fiber channel configured to receive a fiber therein, and a first insert channel disposed on the first main surface such that the first insert channel extends through a length of the first main surface and is configured to receive the first channel insert. The second holder plate includes a second channel insert including a second fiber channel configured to receive the fiber therein, and a second insert channel disposed on the second main surface such that the second insert channel extends through a length of the second main surface and is configured to receive the second channel insert. The first and second channel inserts are disposed within the first and second insert channels, respectively.



Resonator for thermo optic device

Tue, 26 May 2015 08:00:00 EDT

A resonator for thermo optic devices is formed in the same process steps as a waveguide and is formed in a depression of a lower cladding while the waveguide is formed on a surface of the lower cladding. Since upper surfaces of the resonator and waveguide are substantially coplanar, the aspect ratio, as between the waveguide and resonator in an area where the waveguide and resonator front one another, decreases thereby increasing the bandwidth of the resonator. The depression is formed by photomasking and etching the lower cladding before forming the resonator and waveguide. Pluralities of resonators are also taught that are formed in a plurality of depressions of the lower cladding. To decrease resonator bandwidth, waveguide(s) are formed in the depression(s) of the lower cladding while the resonator is formed on the surface. Thermo optic devices formed with these resonators are also taught.



Method and structure combining vertical and angled facets in silicon photonic waveguides

Tue, 26 May 2015 08:00:00 EDT

Embodiments of the invention use crystallographic etching of SOI wafers with a (110)-oriented epi layer to form both the vertical input facet and the re-entrant mirror. Proposed layout design combined with proposed orientation of the epi enables both vertical facets and re-entrant (upward-reflecting) mirror facets to be made in a single wafer-level wet etch process.



Low bending loss multimode fiber transmission system

Tue, 26 May 2015 08:00:00 EDT

A bend-loss tolerant multimode fiber transmission system is provided. The system includes: a transmission fiber having a core and a cladding, and a mode-launching system for selectively exciting only a useful portion of the transmission modes, that portion corresponding to high effective refractive indices relative to a refractive index of the cladding the useful portion corresponding to a substantial number of modes. The mode-launching system may include a lead-in fiber, coupled to the transmission fiber, supporting a number of lead-in modes substantially corresponding to the number of transmission modes in the useful portion. The transmission fiber may have a refractive index profile, within a region of its core that is aligned with the lead-in fiber core, which has a shape that matches a refractive index profile shape in the lead-in fiber core. The transmission fiber core may have a graded refractive index profile that is parabolic or nearly parabolic or truncated.



Energy target system

Tue, 26 May 2015 08:00:00 EDT

A system for determining properties of a radiant energy beam. The system include a plurality of fiber optic cables each including a first end and a second end and a plurality of optical coupling nodes coupled to a target body, wherein each optical coupling node includes one or more terminations, wherein each termination is coupled to the first end of one of the plurality of fiber optical cables to receive radiant energy from an incident radiant energy beam to determine properties of the radiant energy beam.



Water-soluble water-blocking element

Tue, 26 May 2015 08:00:00 EDT

The present invention provides optical-fiber communication cables with an improved water-blocking element that reduces or eliminates microbending caused by water-swellable particulate powders. In one embodiment, such water-swellable powders may be employed in conjunction with a smooth water-soluble carrier tape. In another embodiment, such water-swellable powders may embedded within a water-soluble binder. The water-blocking element is deployed within optical-fiber buffer tubes to water-block the buffer tubes and to minimize microbending that can occur when water-swellable particulate powders press against optical fibers.



Universal optical fibers for optical fiber connectors

Tue, 26 May 2015 08:00:00 EDT

An optical fiber for use as a stub fiber in an optical fiber connector is disclosed. The optical fiber is configured with a segmented core that includes a single-mode segment with a step-index profile and at least one multimode segment having at least one alpha profile. A connector that employs the stub fiber can connect to both a single mode fiber and a multimode fiber.



Optical coupling module for silicon photonics chip

Tue, 26 May 2015 08:00:00 EDT

An optical coupling module for a silicon photonics chip in which a grating is formed on an optical waveguide, and a material having an intermediate refractive index between refractive indexes of a core and a cladding for side surface optical coupling of the silicon photonics chip is provided. The optical coupling module which is optically coupled with an internal/external optical fiber comprises a core transmitting light, and a cladding covering the core and holding the light in the core through total internal reflection, wherein a grating is formed at one end of the core, and a refractive element is formed between the one end of the core and the cladding, has an intermediate refractive index between the refractive indexes of the core and the cladding, and is optically coupled with the internal/external optical fiber.



Hybrid laser light sources for photonic integrated circuits

Tue, 26 May 2015 08:00:00 EDT

A light source for a photonic integrated circuit may comprise a reflection coupling layer formed on a substrate in which an optical waveguide is provided, at least one side of the reflection coupling layer being optically connected to the optical waveguide; an optical mode alignment layer provided on the reflection coupling layer; and/or an upper structure provided on the optical mode alignment layer and including an active layer for generating light and a reflection layer provided on the active layer. A light source for a photonic integrated circuit may comprise a lower reflection layer; an optical waveguide optically connected to the lower reflection layer; an optical mode alignment layer on the lower reflection layer; an active layer on the optical mode alignment layer; and/or an upper reflection layer on the active layer.



Optical switch and optical switch array

Tue, 26 May 2015 08:00:00 EDT

An optical switch includes: a semiconductor substrate, including a first rotation part and a first torsion beam disposed at two ends of the first rotation part, where the first torsion beam is configured to drive the first rotation part to rotate; a microreflector, disposed on a surface of the first rotation part of the semiconductor substrate; a first latching structure, disposed on a surface of the first torsion beam, the first latching structure including a form self remolding (FSR) material layer and a thermal field source, where the thermal field source is configured to provide a thermal field for the FSR material layer and the FSR material layer is configured to undergo form remolding under the thermal field, so as to latch the first rotation part and the microreflector in a position after rotation.



Multiple port, multiple state optical switch

Tue, 26 May 2015 08:00:00 EDT

An optical switch (16) for alternatively redirecting a source beam (14) includes a director assembly (18) that is selectively moveable between (i) a first switch position (350), (ii) a second switch position (352), and (iii) a dual switch position (354). In the first switch position (350), the source beam (14) passes to a first port (36). In the second switch position (352), the source beam (14) is directed to a second port (38). In the dual switch position (354), the director assembly (18) splits the source beam (14) into a first beam part (314A) that is directed to the first port (36), and a second beam part (314B) that is directed to the second port (38).



Waveguide lens for coupling laser light source and optical element

Tue, 26 May 2015 08:00:00 EDT

A waveguide lens includes a substrate, a planar waveguide formed on the substrate and configured to couple with a laser light source that emits a laser beam into the planar waveguide along an optical axis, and a media grating film including two media gratings with a gap intervening therebetween. Each media grating is symmetrical about a widthwise central axis. Each widthwise central axis and the optical axis are substantially parallel with each other and cooperatively define a plane that is substantially perpendicular to the planar waveguide.



Optical waveguide platform with hybrid-integrated optical transmission device and optical active device and method of manufacturing the same

Tue, 26 May 2015 08:00:00 EDT

Disclosed are an optical waveguide platform with integrated active transmission device and monitoring photodiode. The optical waveguide platform with hybrid integrated optical transmission device and optical active device includes an optical waveguide region formed by stacking a lower cladding layer, a core layer and an upper cladding layer on a substrate; a trench region formed by etching a portion of the optical waveguide region; and a spot expanding region formed on the core layer in the optical waveguide region, in which the optical transmission device is mounted in the trench region and the optical active device is flip-chip bonded to the spot expanding region. The monitoring photodiode is flip-chip bonded to the spot expanding region of the core layer of the optical waveguide, thereby monitoring output light including an optical coupling loss that occurs during flip-chip bonding.



Photonic monitoring for optical signals

Tue, 26 May 2015 08:00:00 EDT

This invention concerns real-time multi-impairment signal performance monitoring. In particular it concerns an optical device, for instance a monolithic integrated photonics chip, comprising a waveguide having an input region to receive a signal for characterization, and a narrow band CW laser signal. A non-linear waveguide region to mix the two received signals. More than one output region, each equipped with bandpass filters that extract respective discrete frequency bands of the RF spectrum of the mixed signals. And, also comprising (slow) power detectors to output the extracted discrete frequency banded signals.



Electro-optic modulator

Tue, 26 May 2015 08:00:00 EDT

An electro-optical modulator device includes an optical signal path partially defined by a waveguide portion, a radio frequency (RF) signal path partially defined by a conductive line portion, an interaction region where an RF signal propagating in the RF signal path interacts with an optical signal propagating in the optical signal path to modulate the optical signal, and a first tuning portion arranged proximate to the conductive line portion, the first tuning portion including a conductive portion and a switch portion operative to connect the conductive portion to ground.



Optical modulator including graphene

Tue, 26 May 2015 08:00:00 EDT

An optical modulator includes a first graphene and a second graphene on an upper surface of a semiconductor layer, a first electrode on the first graphene, and a second electrode on the second graphene. Respective side surfaces of the first graphene and the second graphene are separated from each other. A first ridge portion of the semiconductor layer and a second ridge portion on the second graphene constitute an optical waveguide, and the first and second graphenes are on a center portion of the optical waveguide in a vertical direction to the semiconductor.



Thermal management of a communication transceiver in an electrical communication device

Tue, 26 May 2015 08:00:00 EDT

Disclosed herein are various systems and methods relating to communication devices that include modular transceivers, such as small form pluggable transceivers. According to one embodiment, a communication device may include a chassis defining an interior and an exterior of the communication device. The chassis includes a top, a bottom, and a plurality of sides that together with the top and the bottom form an enclosure. One of the sides may include a first segment disposed in a first plane and a second segment disposed in a second plane. The second segment includes an outwardly extending communication transceiver housing configured to receive a communication transceiver. The communication transceiver may extend through an aperture in the second segment and into interior of the communication device to contact an electrical connector, while a second portion of the communication transceiver in the communication transceiver housing remains on the exterior of the communication device.



Chip-based frequency comb generator with microwave repetition rate

Tue, 26 May 2015 08:00:00 EDT

A frequency comb generator fabricated on a chip with elimination of a disadvantageous reflow process, includes an ultra-high Q disk resonator having a waveguide that is a part of a wedge structure fabricated from a silicon dioxide layer of the chip. The disk resonator allows generation of a frequency comb with a mode spacing as low as 2.6 GHz and up to 220 GHz. A surface-loss-limited behavior of the disk resonator decouples a strong dependence of pumping threshold on repetition rate.



Photomixer-waveguide coupling tapers

Tue, 26 May 2015 08:00:00 EDT

Disclosed are systems and methods for improving the performance of systems for generating and detecting electromagnetic radiation at terahertz (THz) frequencies. Embodiments of the systems and methods include the fabrication and use of coupling tapers to provide efficient transfer of THz radiation between a photomixer and a waveguide that supports a propagating THz mode. A representative system comprises of a photomixer to convert high-frequency components of an optical pump signal into corresponding electrical THz frequencies, a waveguide that supports a propagating THz mode, and a matching taper that effectively converts the highly localized currents generated by the photomixer to the mode supported by the waveguide.



Combined optical and electrical interface

Tue, 26 May 2015 08:00:00 EDT

A connection port provides electrical and/or optical interface capability. The combined electrical and optical interface port may include an optical communication light engine within the connection port itself. The connection port includes a connector housing, an electrical interface assembly, and an optical interface assembly incorporated together. One implementation of the optical communication light engine includes a laser diode to generate optical signals, a photo diode to receive optical signals, and an optical integrated circuit (IC) to control optical interface.



Compact multi-channel optical transceiver module

Tue, 26 May 2015 08:00:00 EDT

A compact multi-channel optical may include a multi-channel transmitter optical subassembly (TOSA), a multi-channel receiver optical subassembly (ROSA) and a circuit board configured and arranged to fit within a relatively small space. The multi-channel ROSA is spaced from the circuit board to allow circuit components to be mounted between the circuit board and the ROSA. The multi-channel ROSA may also be inverted and mounted proximate a transceiver top housing portion, for example, using an L-shaped ROSA support, to transfer heat from the ROSA to the transceiver housing portion. The optical transceiver may be used in a wavelength division multiplexed (WDM) optical system, for example, in an optical line terminal (OLT) in a WDM passive optical network (PON).



Interposer

Tue, 26 May 2015 08:00:00 EDT

An interposer comprising: (a) a planar substrate having top and bottom surfaces, said bottom surface defining at least one ferrule alignment structure, and one or more fiber bores extending from said bottom surface to said top surface, each fiber bore being in a certain position relative to said ferrule alignment structure and adapted to receive a fiber; (b) one or more lenses on or near said top surface, each lens aligned with one of said fiber bores; (c) at least one ferrule having an end face and comprising one or more fibers protruding from said end face, and at least one alignment feature cooperating with said ferrule alignment structure to position said ferrule precisely on said bottom surface such that said fibers are disposed in said fiber bores and are optically coupled with said lenses; and (d) at least one optical component having one or more optical interfaces and being mounted on said top surface such that each of said optical interfaces is aligned with one of said fiber bores and is optically coupled with one of said lenses corresponding to said one of said fiber bores.



Optical transceiver having enhanced EMI tolerance

Tue, 26 May 2015 08:00:00 EDT

An optical transceiver that attenuates the EMI radiation leaked therefrom is disclosed. The optical transceiver includes a top cover and the bottom base to form a cavity into which a TOSA, a ROSA, and a circuit are set. At least one of the top cover and the bottom base provides a combed structure in a rear portion of the optical transceiver, where the combed structure has a plurality of T-shaped fins to attenuate the EMI radiation.



Optical transceiver with finger tightly fastened to housing

Tue, 26 May 2015 08:00:00 EDT

An optical transceiver easily set within the cage of the host system. The optical transceiver of an embodiment provides a finger surrounding the housing of the optical transceiver. The finger has an rear edge, whose tip is bent downward so as to be received in the first groove of the housing, extending diagonally to the brim of the cage; and a reinforced portion with a U-shaped cross section tightly set within the second groove of the housing.



Optical-electric converting module

Tue, 26 May 2015 08:00:00 EDT

An optical-electric converting module includes a printed circuit board (PCB) and an optical-electric coupling element. The PCB includes a supporting surface, laser diodes and photo diodes. The laser diodes and the photo diodes are positioned on the supporting surface. The optical-electric coupling element includes a lower surface. The lower surface defines a cavity. A bottom portion of the first cavity forms light-receiving coupling lenses and light-emitting coupling lenses. The optical-electric coupling element is positioned on the supporting surface, with each light-receiving coupling lens being aligned with a laser diode, and each light-emitting coupling lens being aligned with a photo diode. A distance between the light-receiving coupling lenses and the laser diodes is equal to a distance between the light-emitting coupling lenses and the photo diodes in a direction perpendicular to the support surface.



Optical signal transmission device

Tue, 26 May 2015 08:00:00 EDT

An optical signal transmission device includes a first and a second photoelectric converting device, a first and a second connector, a plurality of first optical fibers, a plurality of second optical fibers, and an adapter module. The first and the second photoelectric converting devices are electrically connected with the first and the second electronic device. The first and the second connectors separately define a plurality of first and second fixed grooves. The adapter module includes a first and a second adapter portion. The first adapter portion defines a plurality of third fixed grooves. The second adapter portion defines a plurality of fourth fixed grooves. Several optical couplings are generated between the first connector and the first photoelectric converting device, between the second connector and the second photoelectric converting device, and between the first adapter portion and the second adapter portion.



Fixing device for optical fiber detection

Tue, 26 May 2015 08:00:00 EDT

An optical fiber fixing device includes a base, first fixing block and a second fixing block. The base includes an upper surface has a receiving groove and a groove which is connected with the receiving groove. The receiving groove receives an optical fiber connector, the optical fiber connector receives a plurality of optical fibers, and two ends of the optical fibers separately protrude out of the optical fiber connector. The groove has an optical detecting device, the detecting device defines a plurality of light apertures. The first fixing block is set on the upper surface, which is configured to fix the optical fiber connector into the receiving groove. The second fixing block is received in the groove, in order to fix the detecting device in the groove, the plurality of light apertures are aligned with the plurality of optical fibers.



Fiber optic connector structure

Tue, 26 May 2015 08:00:00 EDT

A fiber optic connector structure contains a base, a covering member, and a fitting sleeve. The base includes a holding face, two contacting portions, and at least one slot. A respective one of the at least one slot has an opening and has a bottom portion. The bottom portion of the respective one of the at least one slot has at least one notch, and a respective one of the at least one notch has a first inserting segment and a second inserting segment. The covering member includes two resilient extensions corresponding to the two contacting portions and a sliding block sliding from the opening to the bottom portion. The fitting sleeve is fitted on the base and the covering member, and provides a force on the sliding block, so that the sliding block retains the fiber stub and the field fiber.



Adhesive compositions including partially cross-linked resins and thermoset resins and methods for use thereof

Tue, 26 May 2015 08:00:00 EDT

An optical connector for terminating an optical fiber may include a ferrule, a optical fiber, and an adhesive composition. The ferrule may include a fiber-receiving passage defining an inner surface and the adhesive composition may be disposed within the ferrule and in contact with the inner surface of the ferrule and the optical fiber. The adhesive composition may include a partially cross-linked resin and a thermoset resin. The adhesive composition may include between about 1 to about 85 parts by weight of the thermoset resin per 100 parts by weight of the partially cross-linked resin.



Method to assemble and polish a connector with optical fiber that has air-gaps or “voids” in its cladding

Tue, 26 May 2015 08:00:00 EDT

A method for assembling a fiber optic connector that includes heating an end of a cleaved fiber, inserting the end of the cleaved fiber into a ferrule until the end protrudes from the ferrule, wherein a first portion of the heated end protrudes from the ferrule and a second portion of the heated end remains in the ferrule, fixing the fiber in place in the ferrule, and polishing the end of the cleaved fiber.



Multiport optical fiber terminal

Tue, 26 May 2015 08:00:00 EDT

A multiport optical fiber connection terminal with a compact footprint has a configuration that allows for easy accessibility and interconnection of cables, while providing several mounting options and including storage space within the terminal. The terminal may include cable connectors that are configured to allow for weather proof installation of pre-terminated fiber optic cables with the terminal ports.



Optical fiber connector

Tue, 26 May 2015 08:00:00 EDT

An optical fiber connector includes a first optical-electric coupling element, a second optical-electric coupling element and an elastic location cap. The first optical-electric coupling element includes a location post. The second optical-electric coupling element defines a location hole. The elastic location cap defines a receiving hole. A length of the location post is greater than a length of the location hole. The location post is inserted into the location post to assemble the first optical-electric coupling element to the second optical-electric coupling element, with an exposed portion of the location post exposing out of the location hole. The elastic location cap caps the location post with the exposed portion received in the receiving hole.



Device for connecting optical fibers

Tue, 26 May 2015 08:00:00 EDT

An optical fiber connection device mainly made up of two coupling elements shaped to be inserted in cavities of two connector housings. Each coupling element (11A, 11B) includes a fiber bar (14) having an optical fiber segment (16) passing axially therethrough, and each bar is situated at a predetermined distance from a lens (13) held stationary in the corresponding coupling element; the two coupling elements include conical engagement endpieces.



Backlight module

Tue, 26 May 2015 08:00:00 EDT

A backlight module includes a laser light source, a light guiding board located at a side of the laser light source, a first lens and a second lens both located at a light path of light beams emitted from the laser light source. The laser light source includes one laser diode or a plurality of laser diodes. The light guiding board includes a light incident face and a light emerging face. The first lens firstly converges and then diverges the light beams emitted from the laser light source. The second lens changes the light beams passed through the first lens to be parallel light beams. The parallel light beams have a larger width than that of the light beams just emitted from the laser light source. The parallel light beams enter the light guiding board via the light incident face of the light guiding board.



Long-haul undersea transmission system and fiber

Tue, 19 May 2015 08:00:00 EDT

An undersea long-haul transmission system includes an optical fiber transmission span and a coherent detection and digital signal processing module for providing dispersion compensation. The transmission span includes at least one fiber pair comprising substantially equal lengths of a positive-dispersion first fiber and a negative-dispersion second fiber that are configured to provide a signal output at transmission distances greater than 10,000 km, in which the combined accumulated dispersion across the operating bandwidth does not exceed the dispersion-compensating capacity of the coherent detection and digital signal processing module. Further described is a fiber for use in an undersea long-haul transmission span. At a transmission wavelength of 1550 nm, the fiber has a dispersion coefficient in the range of −16 to −25 ps/nm·km, and a dispersion slope in the range of 0.04 to 0.02 ps/nm2·km.



Fiber optic cable pass-thru fitting

Tue, 19 May 2015 08:00:00 EDT

A cable pass-thru assembly includes a fiber optic cable and a cable pass-thru fitting. The fiber optic cable includes an optical fiber and a strength member. The cable pass-thru fitting is adapted to receive at least a portion of the fiber optic cable. The cable pass-thru fitting includes a housing assembly and an insert assembly. The housing assembly defines a bore. The insert assembly is adapted for engagement with the housing assembly. At least a portion of the insert assembly is disposed in the bore of the housing assembly. The insert assembly includes a nozzle and a retention member. The nozzle defines a cable passage through which the optical fiber of the fiber optic cable passes. The retention member is engaged with the nozzle so that the strength member is captured between the nozzle and the retention member.



Fiber optic enclosure with tear-away spool

Tue, 19 May 2015 08:00:00 EDT

Example fiber optic enclosures include a cable spool assembly and a cover. Each disc of the cable spool assembly has a removable section that extends radially outwardly from a central portion of the disc. The cable spool assembly has a first diameter when the removable sections are attached to the discs. The central portion of each disc has a second diameter. The cover has a lateral dimension that is smaller than the first diameter of the cable spool assembly and larger than the second diameter of the cable spool assembly. Certain types of spool assemblies include a termination region including a plurality of adapters that rotate in unison with the first disc of the cable spool assembly.



Wire connection and distribution casing with connecting part, hollow pipe columns and connected part for communication cables

Tue, 19 May 2015 08:00:00 EDT

A wire connection and distribution casing with a connecting part, hollow pipe columns and a connected part for communication cables includes at least one cable inlet and outlet end face and at least one connected part. At least one connecting part and at least one hollow pipe column which is provided for the communication cables penetrating through the cable inlet and outlet end face and entering into the wire connection and distribution casing for the communication cables are formed on the cable inlet and outlet end face, and the communication cables which are to penetrate through the hollow pipe columns form waterproof structures by means of elastic shrinkable pipes. The connected part may form a waterproof structure by combining with the connecting part. The invention involves many problems which result from the waterproof means of the wire connection and distribution casing for the communication cables in the prior art.



Optical fiber preform, method for producing optical fiber, and optical fiber

Tue, 19 May 2015 08:00:00 EDT

An easily producible optical fiber preform which is drawn to an optical fiber having a core containing a sufficient concentration of alkali metal is provided. An optical fiber preform 10 is composed of silica-based glass and includes a core portion 20 and a cladding portion 30. The core portion 20 includes a first core portion 21 including a central axis and a second core portion 22 disposed on the perimeter of the first core portion 21. The cladding portion 30 includes a first cladding portion 31 disposed on the perimeter of the second core portion 22 and a second cladding portion 32 disposed on the perimeter of the first cladding portion 31. The core portion 20 contains an alkali metal at an average concentration of 5 atomic ppm or more. The concentration of the OH group in the perimeter portion of the first cladding portion 31 is 200 mol ppm or more.



Laser based frequency standards and their applications

Tue, 19 May 2015 08:00:00 EDT

Frequency standards based on mode-locked fiber lasers, fiber amplifiers and fiber-based ultra-broad bandwidth light sources, and applications of the same.



Method and device for diffuse excitation in imaging

Tue, 19 May 2015 08:00:00 EDT

A coupling device for an optical fiber used in optical tomography examination of a medium includes a mass of diffusing material for a wavelength guided by the optical fiber. This mass includes a bearing surface to be applied against the surface of the medium. At least one housing is provided in the mass to receive the end of the optical fiber.



Spot size converters and methods of manufacturing the same

Tue, 19 May 2015 08:00:00 EDT

Provided are a spot size converter and a method of manufacturing the spot size converter. The method includes stacking a lower clad layer, a core layer, and a first upper clad layer on a substrate, tapering the first upper clad layer and the core layer in a first direction on a side of the substrate, forming a waveguide layer on the first upper clad layer and the lower clad layer, and etching the waveguide layer, the first upper clad layer, the core layer, and the lower clad layer such that the waveguide layer is wider than a tapered portion of the core layer on the side of the substrate and has the same width as that of the core layer on another side of the substrate.



Adiabatic mode-profile conversion by selective oxidation for photonic integrated circuit

Tue, 19 May 2015 08:00:00 EDT

Waveguide designs and fabrication methods provide adiabatic waveguide eigen mode conversion and can be applied to monolithic vertical integration of active and passive elements in PICs. An advantage of the designs and methods is a simple fabrication procedure with only a single etching step in combination with subsequent well-controllable selective oxidation. As a result, improved manufacturability and reliability can be achieved.