Abstract: An optical system includes optical devices that each have a top side and a bottom side between lateral sides. A first one of the devices has one or more first waveguides immobilized on a first base. The first device having a first via that defines an optical path that extends from the top side of the first device to the bottom side of the first device. A second one of the devices has a second waveguide immobilized on a second base. An optical fiber has a fiber facet immobilized relative to the first device and aligned with the first via. The first device is between the fiber facet and the second device. The first device, the second device and the optical fiber are arranged such that a light signal exchanged between the optical fiber and the second waveguide travels through the first via.

Abstract: An apparatus comprises one or more electro-optical coupling modules. An electro-optical coupling module comprises a diode, a flexible optical coupling element, a reflective surface, and an optical fiber. The diode performs an electro-optical conversion on a signal. The flexible optical coupling element communicates the signal between the diode and the reflective surface. The reflective surface reflects the signal between the flexible optical coupling element and the optical fiber.

Abstract: Devices, systems and techniques for directly coupling an optical slot waveguide to another optical waveguide without a taper waveguide region between the two optical waveguides.

Abstract: A two-ring optical buffer comprising a first ring operatively connected to a waveguide and a second ring, the second ring being operatively connected to only the first ring, the second ring and the first ring having a circumferential ratio substantially equal to 2m, where m is an integer. A ratio of resonance splitting over resonance broadening may be approximately 0.6.

Abstract: In a connector system, a first connector is mechanically and optically mateable with a second connector to form one or more optical signal communication links A wiping cleaner is included on at least one of the first and second connectors for cleaning an optical port of the other of the first and second connectors when the connectors are plugged together.

Abstract: Techniques are generally disclosed for optical devices that may be used to implement a variety of logic devices or other circuits by optical means. Example optical devices use a photodiode to alter the charge carrier concentration in a waveguide, thereby altering the index of refraction of the waveguide. The photodiode may be driven by an optical signal, which may be coupled to the photodiode through an optical waveguide. The optical signal may be configured to control the phase of coherent light coupled through the waveguide. A variety of logic devices and other circuits may be implemented by allowing the light coupled through the waveguide to constructively or destructively interfere with other coherent light.

Abstract: An optical interconnect that uses silver, gold, copper or other materials whose refractive index n is less than unity as the transmitting media has been conceived. This optical interconnect will transfer information over short distances faster than electrical conduction and faster than free-space optical transmission. The transfer speed is many times the free-space speed of light.

Abstract: A system for detecting single-shot pulse contrast includes a correlator generating a correlation signal, a spectral filter filtering light signals having wavelengths different from the correlation signal, a fiber array comprising a plurality of fibers with different lengths for transmitting the correlation signal in parallel forming parallel correlation signals, and a fiber bundle bounding the fibers at the end thereof for converging the parallel correlation signals, wherein due to different lengths of the fibers, the parallel correlation signals are converted into serial correlation signals at end of the fibers, a plurality of fiber attenuators spliced into at least one of the fibers respectively for attenuating the parallel correlation signals, a detector for detecting the serial correlation signals to produce analog signals, an A/D convertor converting the analog signals to digital signals, and a computer for processing the digital signals for retrieving the single-shot pulse contrast.

Abstract: An optical coupling device includes an optical fiber holder configured to hold an optical fiber, a wavelength conversion member including a phosphor and an optical characteristic matching member and a wavelength conversion member holder configured to hold the wavelength conversion member. The optical coupling device includes a first region which is formed on an end face of the optical fiber and an end face of the wavelength conversion member, which are optically coupled, when bonding the optical fiber holder and the wavelength conversion member holder, and in which foreign bodies that shield the laser beam are removed from an optical axis of the optical fiber and an optical axis of the wavelength conversion member and a second region which is formed outside the first region when bonding the optical fiber holder and the wavelength conversion member holder, and in which the foreign bodies removed from the first region flow.

Abstract: A light input/output terminal module 100 comprises a jacket tube 110 and a flange 120. A glass portion 20 of the optical fiber is inserted in the center portion thereof. To efficiently remove the leaked light in a cladding 22 to the jacket tube 110, the jacket tube 110 is made of silica glass or the same material as that of the cladding 22. The jacket tube 110 is fixed by fusion splicing or adhesion to the cladding so as to integrally unify the jacket tube 110 and the cladding 22. The beam diameter at the fiber end portion is enlarged by an optical component which fusion bonds the tip end of the optical fiber to the coreless fiber so that the optical power density at the light input/output terminal module is reduced.

Abstract: An adapter couples a length of optical fiber to a hollow probe and to an optical coherence tomography instrument. The length of optical fiber may be greater than the length of the adapter itself. The optical fiber is fixed to an optical coupler at a proximal end of the adapter and may be maintained in a curved configuration by features located in an internal cavity of the adapter. An optical fiber advance mechanism be used to advance and/or retract the length of optical fiber to align it within the hollow probe.

Abstract: The invention relates to an optical component including an array of coupled waveguides, wherein said waveguide array includes: a first area made of parallel waveguides coupled according to a first coupling coefficient; a second area adjacent to the first area and made of parallel waveguides coupled according to a second coupling coefficient lower than the first coupling coefficient; a third area adjacent to the second area and made of parallel waveguides coupled according to a third coupling coefficient higher than the second coupling coefficient; a fourth area adjacent to the third area and made of parallel waveguides coupled according to a fourth coupling coefficient lower than the third coupling coefficient; and a fifth area adjacent to the fourth area and made of parallel waveguides coupled according to a fifth coupling coefficient higher than the fourth coupling coefficient.

Abstract: A method to maximize the coupling efficiency between a collimated, free-space optical signal and a fiber optic waveguide using an active optical element to steer and focus the collimated beam driven by an adaptive controller that periodically auto-calibrates the active optical element's parameters to maximize the measured power received by the waveguide using a gradient ascent optimization algorithm.

Abstract: The present invention relates to light guide bodies having improved luminous intensity and transparency, to a method for their production and to their use.

Abstract: The present invention provides an optical branching device and an optical communication system which are easy to connect with optical fibers. In the optical branching device, when light emitted from an optical fiber in a front stage is incident on an entrance port of a multicore optical fiber, the light propagates through a first core and then is distributed from the first core to four second cores by core-to-core crosstalk between the first and second cores. The light beams distributed to the four second cores propagate through the respective cores and are emitted to four optical waveguides optically coupled core-to-core thereto within a fan-out part at exit ports.

Abstract: A tunable optical filter is formed by the longitudinal alignment of two opposing end sections of single-mode optical fibers. On at least one of the end sections is a collimator fiber section which is formed from a section of a graded-index, multimode optical fiber which is an odd number of quarter pitches long. The collimator fiber section has an angled end surface which joined to the reciprocally angled end surface of the at least one single-mode optical fiber end section. Piezoelectric material controls the separation between the first and second single-mode optical fiber end sections and sets the wavelengths of optical signals carried through the first and second single-mode optical fiber end sections.

Abstract: A variety of structures, methods, systems, and configurations can support plasmons for multiplexing.

Abstract: A light transmission assembly includes a light circuit board and a light transmission module. The board is embedded with waveguide layers, the waveguides layers includes core wires and shielding lays sandwiching the core wires, the waveguide layers defines a second light port portion of which the core wires defines vertical end faces. The light transmission module includes a base and a first light port portion projecting from a first face of the base, the first light port portion defines vertical end faces, the base defines a slanting surface at a second face opposite to the first face thereof. The first and second light port portions are aligned with each other when the light transmission module is coupled with light circuit board so that light lines go directly from the core wires through the light transmission module and reflect at the slant surface.

Abstract: An optocoupler with optical transmitter and receiver dies attached to a single conductive pad is presented. One of the optical transmitter and receiver dies may be attached directly to the conductive pad, while the other one of the optical transmitter and receiver dies may be attached to the conductive pad by means of three layers of materials comprising an isolation layer sandwiched between two attachment layers. A multi-channel optocoupler with multiple transmitter and/or receiver dies is also presented, in which one of the optical transmitter and receiver dies may be attached directly to the conductive pad. The other optical transmitter or receiver dies may be attached to the conductive pad by means of three layers of materials comprising an isolation layer sandwiched between two attachment layers.

Abstract: An optocoupler with a light guide defining element is presented. The light guide defining element has at least one cavity configured to define the shape of the light guide formed by a transparent encapsulant encapsulating the optical transmitter and receiver dies. The transparent encapsulant in liquid form may be injected into the cavity prior to a curing process to harden the encapsulant into a light guide with a predetermined shape. The cavity of the light guide element may be defined by a reflective surface having micro-optics formed thereon. A multichannel optocoupler with multiple transmitter and/or receiver dies having such light guide defining element is also presented. The light guide defining element may have a single cavity enveloping all the optical transmitter or receiver dies, or a multiple cavities by having a pair of transmitter and receiver dies inside each cavity.

Abstract: A coupling structure of waveguide including a line defect (LD) waveguide portion having an LD waveguide, an electromagnetic field distribution matching portion (EFDMP) connected between the LD waveguide portion and a first tapered portion, the first tapered portion connected with the EFDMP, and a thin line waveguide portion connected with the first tapered portion and having a thin line waveguide. The EFDMP has a matching portion LD as the LD of a columnar photonic crystal, and the matching portion LD is connected with the LD waveguide. The first tapered portion consists of a first thin wire core, and the first LD of a columnar photonic crystal arranged along at least one side of first thin line core. At least one of the first thin line core and the first LD is connected with the matching portion line defect. The thin line waveguide is connected with the first thin line core.

Abstract: A method of forming a waveguide or an optical assembly includes molding a waveguide material, optionally in alignment with one or more optical components. The one or more optical components are aligned in a precision mold that is also used to form the waveguide. A cladding and encapsulation material can also be molded. The molded materials can be used to hold the components together in alignment in a single assembly. A connector structure can be molded as part of the assembly or can be prefabricated and incorporated into the molded assembly to facilitate connecting the assembly to other components without requiring active alignment or polishing of optical fiber ends.

Abstract: A Mach-Zehnder type optical modulator includes an optical waveguide formed in an electro-optical substrate, an input section that inputs light to the optical waveguide, a plurality of branch modulation sections that generate branched input light, extend from the input section and modulate the branched input light, an interference photocoupler including a plurality of input ports and a plurality of output ports, the input ports being coupled to the branch modulation sections, and an output photocoupler including a plurality of input ports coupled to the output ports of the interference photocoupler and also including a plurality of output ports.

Abstract: Methods and structures are disclosed demultiplexing optical signals transmitted over an optical fiber into a silicon substrate and to multiple detectors. The silicon substrate has two spaced-apart surfaces and a diffractive element disposed adjacent to one of the surfaces. Each of the optical signals corresponds to one of multiple wavelengths. The optical signals are directed into the silicon substrate along a path through the first surface to be incident on the diffractive element. The path is oriented generally normal with the first surface and/or with the diffractive element, which angularly separates the optical signals such that each of the wavelengths traverses through the substrate in a wavelength dependent direction to the first surface. Each optical signal is steered from the first surface towards the second surface to be incident on different optical elements that direct them generally normal to the first surface to be incident on one of the detectors.

Abstract: This invention provides a versatile unit cell as well as programmable and reconfigurable optical signal processors (such as optical-domain RF filters) that are constructed from arrays of those unit cells interconnected by optical waveguides. Each unit cell comprises an optical microdisk, an optical phase shifter, and at least one input/output optical waveguide, wherein the microdisk and the phase shifter are both optically connected to a common waveguide.

Abstract: An optical waveguide comprising a core and a clad characterized in that a desired part is heated and transited to machining strain release state, the part transited to the machining strain release state is curved with a specified bending radius and transited to machining strain state. That part of the optical waveguide is heated to a temperature within a range between the bending point and softening point and transited to machining strain state. The optical waveguide is an optical fiber having the outer diameter not shorter than 50 ?m. The optical waveguide has the outer diameter not shorter than ten times of the mode field diameter of the optical waveguide. The optical waveguide has a bending radius of 5.0 mm or less and difference equivalent of refractive index &Dgr;1 between the core and clad falls within a range of 0.8-3.5%.

Abstract: Disclosed herein is a photonic crystal waveguide inlet structure for improving coupling efficiency of a strip waveguide and a photonic crystal waveguide. The photonic crystal waveguide inlet structure includes an inlet region of the photonic crystal waveguide. The photonic crystal waveguide includes photonic crystals in which air holes are arranged in a triangle lattice shape in a dielectric, and a hybrid waveguide in which at least one of the air holes is removed, the hybrid waveguide spacing the inlet region apart from the strip waveguide.

Abstract: A method for producing the optical coupler includes mounting a first conversion element on an upper surface of a first terminal plate, mounting a second conversion element on an upper surface of a second terminal plate, supplying a translucent primary mold resin in a fluidized state to the upper surfaces of the first terminal plate and the second terminal plate such that the first conversion element and the second conversion element are covered with the primary mold resin, curing the primary mold resin while inverting vertically the first terminal plate and the second terminal plate to retain the primary mold resin in a state in which the primary mold resin hangs from the first terminal plate and the second terminal plate, and covering a surface of the primary mold resin with a secondary mold resin having a refractive index lower than that of the primary mold resin.

Abstract: A fiberoptic system for clearance detection between rotating and stationary turbomachinery components is presented. The system comprises an optical fiber probe comprising a plurality of optical fibers, at least one of the optical fibers comprising a transmission fiber and at least one of the optical fibers comprising a signal fiber; a light source for providing light through the transmission fiber towards a target; filters for receiving light from the signal fibers, at least two of the filters for filtering different wavelengths; and at least one photodetector for receiving filtered light from the filters.

Abstract: An optical sight is provided and may include a housing, at least one optic supported by the housing, and an illumination device associated with the at least one optic that selectively supplies the at least one optic with light. The illumination device may include a first fiber associated with a first light source and a second fiber associated with a second light source. A coupler may join the first fiber and the second fiber and may supply the at least one optic with light from at least one of the first light source and the second light source.

Abstract: A method and system for implementing high-speed electrical interfaces between semiconductor dies in optical communication systems are disclosed and may include communicating electrical signals between an electronics die and an optoelectronics die via coupling pads which may be located in low impedance points in Tx and Rx paths. The electrical signals may be communicated via one or more current-mode, controlled impedance, and/or capacitively-coupled interfaces. The current-mode interface may include a cascode amplifier stage split between source and drain terminals of transistors on the dies. The controlled-impedance interfaces may include transmission line drivers on a first die and transmission lines on a second die. The capacitively-coupled interfaces may include capacitors formed by contact pads on the dies. The coupling pads may be connected via one or more of: wire bonds, metal pillars, solder balls, or conductive resin. The dies may comprise CMOS and may be coupled in a flip-chip configuration.

Abstract: A combined structure of optical waveguides with high accuracy can be easily materialized by arranging cutout sections 11a and 12a for half-lap joint in a light-emitting sided-optical waveguide and a light-receiving sided-waveguide to combine both of the cutout sections by a half-lap joint 13. This enables to significantly reduce time for minor adjustments after assembling.

Abstract: Provided are a photoelectric conversion module for direct optical interconnection and a method of manufacturing the same, wherein an optical element array is bonded to a side surface of an IC board having a semiconductor chip mounted thereon and an optical waveguide array is bonded to one end of the optical element array having the other end bonded to the IC board to be optically connected to the optical element array, thereby improving the efficiency of optical coupling between optical elements and optical waveguides, and wherein since the optical coupling between the optical elements and the optical waveguides is realized on the same plane between the optical waveguides having the same array as the optical elements, multi-channel optical coupling can be facilitated to enable easy implementation of an optical design.

Abstract: A polarization filter utilizing Brewster's angle. The polarization filter includes a stimulus receiving body having more than one facet. At least two of the more than one facet being arranged at Brewster's angle (relative to the plane of polarization of the incident stimulus) and positioned in different radial orientations (relative to the incident stimulus) which are adapted to provide differential transmission or reflection of polarized electro-magnetic radiation coming from a common source.

Abstract: A fibre optic transmission application, in particular, an optical device that can be incorporated into telecommunications equipment as well as into test and measurement equipment with reduced insertion loss, reduced crosstalk effects and reduced height, with increased versatility in the implementation of optical functions other than multiplexers and demultiplexers. Relates to components, modules, equipments and instruments such as multiplexers, demultiplexers, routers, channel monitors, and tunable filters that encompass such optical devices.

Abstract: An optical fiber is designed to transmit high-power laser radiation. The optical fiber includes a fiber core, and an inner fiber cladding surrounding the fiber core, where the inner fiber cladding is configured to carry the laser radiation in the fiber core. The optical fiber also includes a first outer fiber cladding surrounding the inner fiber cladding. The first outer fiber cladding has a capillary-free longitudinal section and has a smaller refractive index than the refractive index of the inner fiber cladding. The optical fiber includes an outermost fiber cladding surrounding the first outer fiber cladding. The outermost fiber cladding has scattering centers that surround the capillary-free longitudinal section, where the scattering centers scatter laser radiation emerging from the inner fiber cladding through the first outer fiber cladding along the capillary-free section.

Abstract: Disclosed are an optical waveguide and a bi-directional light transceiver, in which a wavelength selective filer is provided in the core of the optical waveguide to divide bi-directional signals, so that manual alignment of optical components are easily achieved and thus a small bi-directional light transceiver is realized and transmission/reception efficiency of light is enhanced.

Abstract: A filter element includes a first glass substrate having a pair of parallel surfaces and a band pass filter arranged on one of the parallel surfaces, a pair of single-crystal substrates (Si wafers) each including a primary surface formed with a depression having an inclined surface with respect to the primary surface occupying at least one half of the opening of the depression, and a second glass substrate having an optical element. The primary surfaces of the single-crystal substrate pair are bonded to a pair of the surfaces of the glass substrate. The depressions are faced through the glass substrate and surround the band pass filter. By this configuration, the filter element can be mass produced with a high accuracy and a low cost by the wafer-level process.

Abstract: According to an optical fiber splicing technique in which optical fibers F11 and F12 respectively connected to optical members 3 and 4 of an optical member unit are connected by fusion splicing, the plurality of optical fibers F11 and F12 and a looped turn-around fiber F21 are positioned facing each other and connected by fusion splicing, to connect the plurality of optical fibers F11 and F12 with each other.

Abstract: An optical fiber connector has a first ferrule holding an end of a first optical fiber, a first fiber stub connected to the first ferrule, a second ferrule holding an end of a second optical fiber, and a second fiber stub connected to the second ferrule. The first fiber stub enlarges the beam diameter of light transmitted through the first optical fiber, and produces the collimated light. The second fiber stub reduces the beam diameter of the collimated light, and leads the converging light into the second optical fiber. The first and second fiber stubs are detachably connected inside a connection sleeve across a predetermined gap. First and second GI fibers contained in the first and second fiber stubs satisfy L1?L2 and L1+L2?½ pitch, wherein L1 and L2 represent the lengths of the first and second GI fibers, and one pitch is a sinusoidal period of the light transmitted therethrough.

Abstract: In one embodiment, an apparatus may include an optical fiber that may have a surface non-normal to a longitudinal axis of a distal end portion of the optical fiber. The surface may define a portion of an interface configured to redirect electromagnetic radiation propagated from within the optical fiber and incident on the interface to a direction offset from the longitudinal axis. The apparatus may also include a doped silica cap that may be fused to the optical fiber such that the surface of the optical fiber may be disposed within a cavity defined by the doped silica cap.

Abstract: Provided herein are photonic devices configured to display photonic band gap structure with a degenerate band edge. Electromagnetic radiation incident upon these photonic devices can be converted into a frozen mode characterized by a significantly increased amplitude, as compared to that of the incident wave. The device can also be configured as a resonance cavity with a giant transmission band edge resonance. In an exemplary embodiment, the photonic device is a periodic layered structure with each unit cell comprising at least two anisotropic layers with misaligned anisotropy. The degenerate band edge at given frequency can be achieved by paper choice of the layers' thicknesses and the misalignment angle. In another embodiment, the photonic device is configured as a waveguide periodically modulated along its axis.

Abstract: A photonic connection includes a first fiber and a second fiber. The first fiber has a core with a first predetermined pattern defined on or in a facet thereof, and the second fiber has a core with a second predetermined pattern defined on or in a facet thereof. The second predetermined pattern is complementary to the first predetermined pattern such that the first fiber or the second fiber fits into another of the second fiber or the first fiber at a single orientation and position.

Abstract: A system and method for compensating for non-uniform illumination from a light guide for a display in an electronics device is provided. The system comprises: a memory device storing a data representing a first compensation pattern for generation on the display to block light from a first portion of the light guide relative to light from a second portion of the light guide; a first module to incorporate the stored representation into an image to be displayed on the display; and a second module to generate the image with the stored representation for display on the display. In the system, when the first module generates the first compensation pattern on the display, the first compensation pattern aligns with the first and second portions to reduce an intensity of light from a light source passing through the first compensation pattern from the first portion relative to an intensity of light passing through the first compensation pattern from the second portion from the light source.

Abstract: In one or more embodiments, an optical fiber coupler for coupling pump radiation into a rectangular optical fiber includes a fiber section and a pump fiber. The fiber section includes a core having a high aspect ratio cross-section and an interface section. The core is positioned in contact with first and second signal claddings to form reflective boundaries at fast-axis boundaries of the core. The pump fiber is side coupled to the fiber section via the interface section, and configured to couple the pump radiation into the fiber section.

Abstract: All solid photonic bandgap optical fiber comprising a core region and a cladding region is disclosed. The cladding region surrounding the core region includes a background optical material having a first refractive index and elements arranged in a two-dimensional periodic structure. In one embodiment, each of the elements comprises a center part and peripheral part having a higher refractive than the central part. In other embodiments, each element comprises a plurality of rods having a higher refractive index higher than the fist, the rods of each element arranged in a circle or polygon. Light transmission apparatus and methods of using the fiber are also disclosed.

Abstract: An optical fiber includes a cladding, a first core, and a second core. At least one of the first core and the second core is hollow and is substantially surrounded by the cladding. At least a portion of the first core is generally parallel to and spaced from at least a portion of the second core. The optical fiber includes a defect substantially surrounded by the cladding, the defect increasing a coupling coefficient between the first core and the second core.

Abstract: An electrically modulated plasmonic junction generates surface plasmons from an electrical signal from an electrical source, with the tunnel junction having a contact with a tapered end forming the junction in a gap between the contact and a substrate, with the gap serving to translate electrical signals into surface plasmons that are in turn translated into emitted photons communicated externally through a transmissive oxide, so that the junction can function as an electrically controlled light emitter preferably built as a nano-scale broadband optical emitter whose output wavelength can be electrically tuned over hundreds of nanometers, can be directly modulated at high speeds, and can have improved efficiencies compared to standard silicon optical sources, and the junction can also operate in a reserve mode for light detection.

Abstract: An optical device includes a first waveguide having an end portion configured to receive an optical signal, the optical signal having a fundamental mode; a second waveguide having an end portion spaced from the end portion of the first waveguide; and a cladding layer surrounding the first and second waveguides. The first waveguide is configured such that the optical signal undergoes multimode interference to focus the fundamental mode at the end portion of the second waveguide.

Abstract: An optical device that comprises an input waveguide, an output waveguide, a high-Q resonant or photonic structure that generate slow light connected to the input waveguide and the output waveguide, and an interface, surface or mode volume modified with at least one material formed from a single molecule, an ordered aggregate of molecules or nanostructures. The optical device may include more than one input waveguide, output waveguide, high-Q resonant or photonic structure and interface, surface or mode volume. The high-Q resonant or photonic structure may comprise at least one selected from the group of: microspherical cavities, microtoroidal cavities, microring-cavities, photonic crystal defect cavities, fabry-perot cavities, photonic crystal waveguides.