Abstract: An optical substrate includes: a submount; a planar optical element which is mounted on the submount; a pair of positioning members which are disposed at an interval across the planar optical element on the submount; an optical waveguide in which a core and a clad are formed by a flexible material; and a holding member which holds the optical waveguide to allow a tip end of the optical waveguide to be inserted between the pair of positioning members, and the optical waveguide to be bent to extend parallel to the submount.

Abstract: An optical splitter adjacent a downstream end of a fiber optic cable is operable for supplying an optical signal to at least one optical fiber from the downstream end of the fiber. A preterminated fiber optic distribution cable includes a first access location having an optical fiber termination fed from an upstream end of the cable and a second access location having an optical fiber termination fed from a downstream end of the cable, wherein the cable includes an upstream optical splitter for feeding a first set of optical fibers and a downstream optical splitter for back-feeding a second set of optical fibers. A fiber optic cable comprising a first set of optical fibers that are terminated and fed from an upstream end of the fiber optic cable and a second set of optical fibers that are terminated and fed from a downstream end of the fiber optic cable.

Abstract: An optical apparatus comprises an optical device formed on a device substrate, a first optical waveguide formed on the substrate or on the optical device, and a second, mechanically discrete optical waveguide assembled with the device substrate, optical device, or first optical waveguide. The first optical waveguide is arranged for transferring an optical signal between the optical device and the first optical waveguide. The first and second optical waveguides are arranged, when the second optical waveguide is assembled with the device substrate, optical device, or first optical waveguide, for transferring the optical signal therebetween via optical transverse coupling.

Abstract: An adjustable optical tap for adjusting input power, output power and drop power in a communications network includes an enclosure having a plurality of connector assemblies being configured for interconnecting input and output cables; a cover attachable to the enclosure, the cover including a plurality of drop cable ports; and a tunable splitter disposed in the enclosure in communication with the input cable and the drop cable ports, the tunable splitter being configured for adjustment to affect attenuation in a broad wavelength band.

Abstract: A technique for photonic switching is disclosed. In one particular exemplary embodiment, the technique may be realized as a method for photonic switching. The method may comprise receiving at least one optical signal at a photonic line card, wherein the at least one optical signal comprises one or more wavelength channels and the photonic line card comprises at least one integrated optical switch. The method may also comprise routing at least one of the one or more wavelength channels through the at least one integrated optical switch to a photonic bus, wherein the photonic bus comprises a plurality of optical paths and each of the plurality of optical paths is capable of carrying multiple wavelength channels.

Abstract: The present invention relates to an optical module that has a structure for protecting a pumping light source at a low cost. The optical module comprises an amplification optical fiber, an optical coupler, a pumping light source, a delay optical fiber, a seed light source, an optical fiber, a photodetector, an optical fiber, an optical isolator, an optical isolator, and a control section. Through the insertion of the delay optical fiber between the pumping light source and the optical coupler, the timing of the output control of the pumping light source which is carried out after the photodetector detects return light leads the timing with which the return light enters the pumping light source. Hence, the time with which the return light enters the pumping light source is shortened and the accumulative damage time of the pumping light source is reduced.

Abstract: An optical fiber line arranging guide groove capable of sensing optical signals is provided for detecting the status of optical signals in the optical fiber line. Through an optical detection circuit and a display element, the connection status of optical signals for the optical fiber line in the optical fiber line arranging guide groove is determined.

Abstract: An optical device including (a) a substrate having an electro-optic effect; (b) an optical waveguide formed on a surface layer portion of said substrate and including an optical waveguide for performing optical modulation for light inputted to said substrate and an output optical waveguide and a monitoring optical waveguide branched from and connected to a downstream side portion of said modulating optical waveguide, said monitoring optical waveguide guiding light for monitoring optical modulation operation of said modulating optical waveguide; and (c) a reflecting portion being provided on the downstream side of said monitoring optical waveguide for reflecting light propagated along said monitoring optical waveguide, the width of a reflection face of said reflecting portion being substantially equal to the cut-out width of said monitoring optical waveguide.

Abstract: There is provided an optical waveguide including: a waveguide core through which light propagates; a cavity that is present inside the waveguide core so as to be open at least one end in the thickness direction of the waveguide core; a layer-form first cladding having a lower refractive index than the waveguide core, and sealing at least one of the at least one opening of the cavity to thereby close the opening of the cavity; and a second cladding having a lower refractive index than the waveguide core, and surrounding the waveguide core. There is also provided a method of manufacturing the optical waveguide.

Abstract: An optically connectable circuit board and optical components mounted thereon. At least one component includes optical transceivers and provides an optical connection to the board. Electronic components may be directly connected to the board electrically or optically. Also, some electronic components may be indirectly connected optically to the board through intermediate optical components.

Abstract: An optical waveguide element having a plurality of surface waveguide portions. A connecting portion for connecting the surface waveguide portions. An output light-outputting waveguide portion connected to the connecting portion each on a dielectric substrate. An output light optical fiber connected to an output end of the output light-outputting waveguide portion. A reinforcing capillary for a connection between the optical waveguide element and the output light optical fiber and a monitoring light receiver. The reinforcing capillary has a hole or groove for supporting the output light optical fiber, a connecting face bonded to an output end face of the substrate, and a terminal surface opposite to the connecting face. The light outputted from the optical waveguide element, therethrough to the outside of the capillary.

Abstract: The present disclosure relates to a fiber optic telecommunications cable assembly including a main fiber optic cable and a tether cable that branches from the main fiber optic cable at a breakout location. The fiber optic telecommunications cable assembly also includes a breakout block mounted to the main fiber optic cable at the breakout location, and an over-mold that covers the breakout block and at least a portion of the main fiber optic cable. The breakout block defines a straight-through channel in which the main fiber optic cable is received and a breakout channel that branches out from the straight-through channel. The breakout block includes seams with overlap configurations that prevent the over-mold from entering the breakout block through the seams. The breakout block also includes barrier dams for preventing bonding material from entering the breakout channel.

Abstract: An optical device is disclosed which suppresses a bias shift which is a deviation of a phase relationship between output signal light and monitoring light. The optical device includes a substrate having an electro-optic effect, a modulating optical waveguide formed on a surface layer portion of the substrate and forming an interference optical modulator for modulating input light, and an output optical waveguide and a monitoring optical waveguide each formed on the surface layer portion of the substrate and branched from and connected to a downstream side portion of the modulating optical waveguide. The monitoring optical waveguide guides light for monitoring optical modulation operation of the modulating optical waveguide. The monitoring optical waveguide has a reduced width region which has a reduced waveguide width.

Abstract: A compact variable optical attenuator having optical-tap functionality is described comprising a planar waveguide attenuator, a lens, and a photodetector. Input and output waveguides are located close to the optical axis of the lens, which reduces optical aberrations and insertion loss. The waveguide attenuator works by light absorption with virtually no scattered light present, which improves fidelity of measurements of the tapped optical power by the photodetector. The entire tap-attenuator assembly is packaged into a small form pluggable (SFP) package having two optical connectors.

Abstract: An optical switch comprises one or more input ports for directing an optical beam into the switch; dispersive means configured to receive said optical beam and which spatially separate the optical beam into individual wavelength components which are routed to an actuator; wherein the actuator is in the form of an array of elongate movable fingers for selectively interfering with individual wavelength components and means are provided to direct optical beams to selected one or more output ports.

Abstract: A curved optical waveguide comprising a core and a clad, characterized in that: the core shape of the curved optical waveguide has no reversal of a curvature on a halfway; and curvatures at both ends of the curved optical waveguide gradually approach zero. A curved optical waveguide comprising a core and a clad, characterized in that: the core shape of the curved optical waveguide has no reversal of a curvature on a halfway; a curvature at one end of the curved optical waveguide gradually approaches zero; and a radius of curvature at other end is finite. An optical waveguide comprising such a curved optical waveguide and an optical waveguide having a different core shape optically connected with the former, and an optical device using such a curved optical waveguide.

Abstract: Integrated fiber tap monitors with variable optical attenuators where light from an input fiber is reflected to the output fiber and a tap is generated from measuring transmission at the reflection.

Abstract: A multiple dwelling unit (MDU) optical fiber splitting unit (FBU). One or more fiber strands enters the FBU at the MDU. Each strand may be connected to a variable attenuator. Each strand is subject to a one to four split. Each of the four split fibers is connected to an optical connection interface such as an SC/ACP connector. Each optical output is connected to an MDU-ONT that supplies an optical interface to copper and cable infrastructure, enabling fiber-based services to be provided to units in an MDU with reduced installation costs and utilization of existing twisted pair and coaxial distribution lines.

Abstract: The present invention provides a splitter. The splitter includes a substrate and a layer formed on the substrate. The layer is patterned such that a signal applied to at least one input port is provided to a plurality of output ports. The relative power of the signal provided at each of the plurality of output ports is determined by at least one property of the substrate and at least one property of the layer.

Abstract: The invention relates to a method and a device for coupling fiber optic cables. Said device comprises at least one module, which is equipped with at least one retaining unit for retaining at least two cassettes. The invention is characterized in that: a cassette is configured with at least one coupling element; at least one strand bundle can be fixed to the module, whereby said strand bundle can be split into at least two strands comprising at least one fiber optic cable; an excess length of strand can be retained by a cassette, the fiber optic cable or cables being connected to the coupling element and the cassette together with its retained strand being detachably connected to the retaining unit.

Abstract: To secure an optical lens over an optoelectronic transmitter or receiver, it is proposed to use a UV-initiated or photoinitiated, cationically curing epoxy resin, by means of which the bonded joint can be set and thereby fixed in a few seconds. Also proposed, for use as adhesives, are resin compositions that can be applied as liquids, are optically matched, and are optimized for durable, reliable use in optoelectronic components and for the large-scale manufacture thereof.

Abstract: An optical substrate includes: a submount; a planar optical element which is mounted on the submount; a pair of positioning members which are disposed at an interval across the planar optical element on the submount; an optical waveguide in which a core and a clad are formed by a flexible material; and a holding member which holds the optical waveguide to allow a tip end of the optical waveguide to be inserted between the pair of positioning members, and the optical waveguide to be bent to extend parallel to the submount.

Abstract: An optical fiber and methods of processing and manufacturing an optical fiber comprising a core, a cladding and a coating covering a segment of the cladding proximate to an end of the optical fiber are presented where patterned apertures are provided in the coating such that a portion of light propagating in the cladding escapes through the patterned apertures of the coating. The patterned apertures allow non-confined light to escape from the cladding in the coating region to provide reduced absorption of the non-confined light by the coating.

Abstract: The invention relates to a method of dividing the power of an input electromagnetic signal into two equal-power signals with a relative phase difference of 180° between them and an equal propagation delay. The inventive method makes use of a photonic crystal coupler comprising two parallel guides which are disposed close to one another and which are based on coupled cavities. The method consists in exciting the odd mode of the coupler which, owing to the symmetry thereof, ensures that the field maxima coincide in one guide with the minima in the adjacent guide, thereby producing a relative phase difference of 180°. The two output signals are obtained through the spatial separation of the guides forming the coupler, making use of the property possessed by guides in photonic crystals for high transmission efficiency through very tight curves. In this way, the size of the structure can be reduced considerably. The inventive method can be used for both two-dimensional and three-dimensional photonic crystals.

Abstract: A system and method directed to an integrated fiber optic splitter assembly having at least two fused splitters disposed in a common substrate. An integrated optical splitter assembly includes a plurality of input fibers, a plurality of output fibers, and a plurality of splitters disposed on a single substrate to either split or couple optical signals between the input and output optical fibers.

Abstract: The present invention provides nanometer-sized diameter silica fibers that exhibit high diameter uniformity and surface smoothness. The silica fibers can have diameters in a range of a about 20 nm to about 1000 nm. An exemplary method according to one embodiment of the invention for generating such fibers utilizes a two-step process in which in an initial step a micrometer sized diameter silica preform fiber is generated, and in a second step, the silica preform is drawn while coupled to a support element to form a nanometer sized diameter silica fiber. The portion of the support element to which the preform is coupled is maintained at a temperature suitable for drawing the nansized fiber, and is preferably controlled to exhibit a temporally stable temperature profile.

Abstract: This invention relates to optical splitters, particularly to optical splitters for use in optical touch screens. The present invention provides an optical splitter for distributing light substantially equally from a multimode input waveguide to an array of output waveguides, via a slab region. The distribution of output waveguide widths is chosen to complement the intensity distribution in the slab region, which may or may not be substantially uniform. The invention also provides an optical splitter for distributing light substantially equally from an optical source to a plurality of waveguides, wherein said optical source directs a beam of light into a slab region. The distribution of waveguide widths is chosen to complement the intensity distribution in the slab region, which may or may not be substantially uniform. When used to distribute optical power in optical touch screens, the splitters of the present invention may be used in series and/or in parallel.

Abstract: An optical power monitor comprising a pig-tail fiber and a GRIN lens opposed to each other with a spacing and each having an end face (angled face) angled with respect to the axis, being low on reflection loss and able to be easily assembled. The pig-tail fiber and the GRIN lens are fixed in respective sleeves having axial end faces adhered to each other. At least one of the pig-tail fiber and the GRIN lens has an arc-segmental end face directed in its axial direction at the tip of its angled face. The arc-segmental end face is positioned in the same plane as the axial end face of the sleeve of the one. The axis of the sleeve of the one is kept vertical to the axial end face of the sleeve of the one. It can be prevented that the axial tip of the other enters the sleeve of the one and comes into contact with an inner wall of the sleeve of the one. Therefore, the assembling man-hours needed to adjust their relative positions can be reduced, and the assembling yield can be improved.

Abstract: An optical power monitor capable of being reduced in size even when designed as a multi-channel monitor, and having a reduced light transmission loss is disclosed. The optical power monitor has two optical fibers provided on the light transmission upstream and downstream sides and having cores, the end surfaces which are opposed to each other with the core optical axes offset from each other, and which are fusion-spliced to each other in a fusion splicing portion, a light reflection surface which faces a portion of the upstream-side optical fiber core end surface offset to protrude from the downstream-side optical fiber core end surface in the fusion splicing portion, and which is provided in the downstream-side optical fiber cladding layer, and a photo-diode positioned opposite from the light reflection surface with respect to the downstream-side optical fiber core.

Abstract: Invention discloses an apparatus that provides linear optical modulation of light carrier signals by an electrical modulation signal. Linearized modulation is achieved through the selection of a spacing profile between two optical transmission waveguides. The spacing profile relates to a transfer function, the parameters of which are chosen to yield linear modulation within a particular dynamic range. A preferred embodiment discloses the invention being fabricated within a monolithic structure.

Abstract: A coated optical fiber capable of transmitting high-power light, which is an optical fiber having an outer surface coated with a coating material, is characterized in that the coating material is made of a transparent UV curable resin so as to prevent the coating material from absorbing light leaked outside from the optical fiber to generate heat. Further, a light transmitting method is characterized in that a fiber fuse propagation threshold which is a minimal light output required for fiber fuse propagation is obtained and a transmitted light output is controlled so that the transmitted light output becomes smaller than the fiber fuse propagation threshold.

Abstract: The present invention has an object to provide an optical device capable of leading out a light propagated through an optical waveguide to a desired substrate side face while maintaining the sufficient power of the light, within a range of limited substrate size. To this end, according to the optical device of the present invention, a groove is formed in the vicinity of an end portion on the optical output side of the optical waveguide, on the substrate on which the optical waveguide is formed, a side wall of the groove is used as a reflecting plane, the light output from the optical waveguide is reflected by the reflecting plane, and the reflected light is emitted from the desired substrate side face.

Abstract: A method and system are provided for remotely monitoring undersea cable systems. Upon receiving a fault alert message, an optical cross-connect is set up between the subject cable station and a testing platform. Testing is conducted and a determination is made whether the fault is in the undersea portion of the network, or in the terrestrial backhaul. By making that determination early, unnecessary technician travel is reduced.

Abstract: An optical instrument for splitting optical spectrum, comprising a series of hollow core optical wave guides (12, 22, and so on) connected by optical couplers (16, 26, and so on) transporting broad band incident optical wave from one stage to another, a narrow band optical wave guide (14, 24, and so on) made of photonic crystal materials mounted inside each of said hollow core optical wave guide and along it, and specified for confining certain portion of the incident optical spectrum. Said inner narrow band optical wave guides bend out at the ends of said outer hollow core optical wave guides to extract and guide out the selected component of the incident optical spectrum. Said optical couplers couple the output optical waves of said outer hollow core wave guides of the previous stages into said inner optical wave guides of the next stages for further splitting.

Abstract: Disclosed is a high-voltage supply unit for electofilters. The unit includes high-voltage devices which are arranged close to the electrofilter and by which the electrofilter is supplied with high voltage, measuring heads which are assigned to the high-voltage devices and by which measured values and optional diagnostic data from the high-voltage devices are detected and transmitted, and control units, each of which is assigned to one high-voltage device and by which the high-voltage devices assigned thereto are controlled and regulated according to the requirements and by taking into account measured values and optional diagnostic data that are transmitted by the measuring heads.

Abstract: An optical waveguide monitor equipped with an output light monitor having a decreased restriction in the dimensions and form thereof, a high reliability and a low production cost includes an optical waveguide element (having a plurality of surface waveguide portions, a connecting portion for converging and connecting the surface waveguide portions and an output light-outputting waveguide portion connected to the connecting portion each formed on a dielectric substrate plate; an output light optical fiber connected to an output end of the output light-outputting waveguide portion, a reinforcing capillary for reinforcing a connection between the optical waveguide element and the output light optical fiber and a monitoring light receiving means, wherein the reinforcing capillary has a hole or groove for containing and supporting the output light optical fiber therein, a connecting face thereof bonded to an output end face of the substrate, and a terminal surface opposite to the connecting face, to thereby enable

Abstract: Integrated fiber tap monitors with variable optical attenuators where light from an input fiber is reflected to the output fiber and a tap is generated from measuring transmission at the reflection.

Abstract: A 1×2 splitter design having low loss is described. The splitter has a non-adiabatic tapered waveguide (22) connected between a substantially single-mode input waveguide (20) and two output waveguides (24, 26). The non-adiabatic tapered waveguide widens in width towards the output waveguide, and merges substantially continuously with the input waveguide in a direction parallel to the optical axis of the input waveguide. This keeps radiation mode generation to a minimum which, in turn, keeps insertion loss low. In the described embodiment, the non-adiabatic taper shape is based on a perturbed cosine function. The 1×2 splitter can be cascaded with other such splitters in order to build a 1×2N splitter design.

Abstract: In an optical tap module, a first lens, a focusing lens, and a photodiode are arranged such that a center axis of a cylindrical case housing the first lens, the focusing lens, and the photodiode is substantially located on the same line. When light propagates through a second optical fiber and is emitted from an end surface facing the first lens so as to be incident on an optical filter, and light transmitted the optical filter is converged by the focusing lens, the photodiode and a chip mounting support are arranged such that a focal point of light is located spatially distant from the surfaces of the photodiode and the chip mounting support.

Abstract: To solve the wavelength dependence of loss uniformity between waveguides for output. A waveguide for input for introducing an optical signal, a slab waveguide for branching off the optical signal introduced in the waveguide for input by diffraction and propagating, and a plurality of waveguides for output for outputting individually a plurality of optical signals which are branched off inside of the slab waveguide are provided. The waveguide for input is configured such that an output end thereof is connected to an incident end of the slab waveguide and has a function for converting a spot size of the optical signal on the incident end of the slab waveguide at a connection point with the slab waveguide.

Abstract: The described integrated planar optical structure comprises a principal waveguide having a core and a cladding that define a first light path ad means sensitive to the light radiated into the cladding comprising at least one secondary waveguide having a core and a cladding that define a second light path. The secondary waveguide has an entry situated in the cladding of the principal waveguide at such a distance from the core of the latter as not to interfere with the propagation of the light along the first optical path and a core section that becomes greater in a first part from the entry onwards to collect the light energy radiated into the cladding. Also described are a system for monitoring the light energy emitted by a source and an optical attenuator that comprise the aforesaid optical structure.

Abstract: An optical device is made up of a glass substrate, an optical fiber array fixed to an upper portion of the glass substrate, a slit that extends from an upper surface of the optical fiber array into the glass substrate, a filter member inserted into the slit, and a resin filled in an interval between the slit and the filter member. An upper end of a light-incident surface of the filter member is positioned substantially in alignment with upper surfaces of the optical fibers, and an upper end of a light-exiting surface of the filter member is disposed at a position below the upper surfaces of the optical fibers.

Abstract: An optical add/drop patch cord. The optical add/drop patch cord has an optical add/drop component enclosed by a casing. An input fiber is optically coupled to the optical add/drop component and permanently or detachably connected to the casing. A drop fiber is optically coupled to the optical add/drop component and permanently or detachably connected to the casing. An add fiber is optically coupled to the optical add/drop component and permanently connected to the casing. An output fiber is optically coupled to the optical add/drop component and permanently connected to the casing.

Abstract: An optical apparatus of the invention has a fusion splice portion where respective ends of two optical fibers each having a core, a cladding, and a UV coat portion provided on the outside of the cladding are fusion spliced, and a re-coat portion which re-coats a portion where the UV coat portion is removed in the vicinity of the fusion splice portion is formed using a material capable of absorbing light radiated from the fusion splice portion. As a result light which is radiated from the fusion splice portion can be reliably prevented from coupling into another optical fiber adjacent to an outside of the re-coat portion.

Abstract: The present invention is directed to the creation of optical waveguiding devices from standard optical fibers by the creation of zones of permanently altered refractive index characteristics therein. A high intensity femtosecond laser beam is focused at a predetermined target region in the fiber so as to soften the glass material at the target region. After aligning the focal region with the target region in the fiber there will be relative movement between the focal region and the fiber, which has the effect of sweeping the focal region across the fiber in a predetermined path, so as to create a secondary waveguide path. A portion of the light traveling along the core is removed from the core along the secondary waveguide path such that the device can be utilized as an attenuator, an optical tap, or a polarimeter.

Abstract: Systems and methods, including azimuthally asymmetric fiber gratings are disclosed.

Abstract: An optical power monitor capable of being reduced in size even when designed as a multi-channel monitor, and having a reduced light transmission loss is disclosed. The optical power monitor has two optical fibers provided on the light transmission upstream and downstream sides and having cores, the end surfaces which are opposed to each other with the core optical axes offset from each other, and which are fusion-spliced to each other in a fusion splicing portion, a light reflection surface which faces a portion of the upstream-side optical fiber core end surface offset to protrude from the downstream-side optical fiber core end surface in the fusion splicing portion, and which is provided in the downstream-side optical fiber cladding layer, and a photo-diode positioned opposite from the light reflection surface with respect to the downstream-side optical fiber core.

Abstract: A waveguide to waveguide monitor includes an optics block between the two waveguides. The optics block couples light between the two waveguides and includes at least two parallel surfaces. The monitor also has an optical tap which creates a monitor beam. The optics block may be flush with the endfaces of the waveguides, even if the endfaces are angled. At least two optical elements needed to couple the light between the two optical waveguides and direct the monitor beam on a detector are on the at least two parallel surfaces of the optics block and any surfaces secured thereto.

Abstract: A funnel-type planar lightwave circuit (PLC) optical splitter having an input optical waveguide, a slab waveguide receiving the input optical signal from the input optical waveguide, and output waveguides projecting from the slab region. The region connecting the slab waveguide to the output waveguides is characterized by a segmented taper structure. In another additional, or alternative aspect of the present invention, a cladding mode absorption region runs along either or both sides of the input optical waveguide. A funnel-type splitter with both a cladding mode absorption region and a segmented taper structure provides a “super” low loss splitter design, when considering both insertion loss and polarization dependent loss. Advantageously, the disclosed funnel-type PLC splitter does not require a quartz substrate due to its very low PDL, and a silicon substrate can be used. Silicon substrates are known to be lower cost, with a higher resistance to fracture.

Abstract: An AWG device includes a plurality of arrayed waveguides positioned close to each other. An input signal excites one of these coupled waveguides and the power is then transferred to all of the arrayed waveguides so there are enough degrees of freedom in the device to achieve any desired distribution.