Abstract: An optical fiber fastening device holds an optical fiber which includes a core and a cladding layer surrounding the core. The cladding layer includes strips peeled from the core. The optical fiber fastening device includes a clamping member and a fastening sleeve. The clamping member includes a first and a second clamping portion buckled together to clamp the optical fiber, with one including at least one locating rod configured for being wrapped around by the strips, and the other including at least one locating hole receiving the at least one locating rod. The fastening sleeve sleeves over and holds the first and the second clamping portion together.

Abstract: An alignment jig for an optical lens array is furnished on an optical alignment apparatus. The alignment machine is for performing active optical alignment operations of a sensor chip located on a circuit board and a lens socket plugged with a fiber plug. The alignment jig includes a support arm, a pick-up mechanism and a pushing mechanism. The support arm is fixed to the optical alignment apparatus for supporting the alignment jig. The pick-up mechanism is furnished on the support arm for picking-up and holding the lens socket in a detachable manner at a predetermined position corresponding to the sensor chip. The pushing mechanism holds the plugging status when the fiber plug is plugged into the lens socket and provides a pushing force, such that the fiber plug has a tendency to be pushed toward and engage the lens socket tightly.

Abstract: A fiber optic ribbon cable includes a stack of fiber optic ribbons, strength members surrounding the stack, and a jacket defining an exterior of the cable. The jacket forms a cavity through which the stack and the strength members extend. The stack has a bend preference, but the strength members are positioned around the stack or are flexible in bending such that the strength members do not have a bend preference. Furthermore, the jacket is structured such that the jacket does not have a bend preference. The cavity is sized relative to the stack in order to allow the stack to bend and twist within the cavity with respect to the jacket as the cable bends, facilitating movement of the optical fibers of the fiber optic ribbons to low-stress positions within the cavity and decoupling the bend preference of the stack from transfer to the jacket.

Abstract: Apparatus and methods are described herein for cleaving an optical element at a defined distance from a splice (or other reference point/feature) of the optical element within a desired precision and/or accuracy. In some embodiments, a method includes receiving an indication of a location of a feature in an intermediate optical assembly visible within an image of the intermediate optical assembly. The feature can be for example, a splice. A position of the intermediate optical assembly is translated relative to a cleave unit based on the indication. After translating, the intermediate optical assembly, the intermediate optical assembly is cleaved to form an optical assembly that has an end face at a location disposed at a non-zero distance from the location of the feature. In some embodiments, the location of the feature can be determined with an image recognition system.

Abstract: Cascaded optical harmonic generators and methods for cascaded optical harmonic generation are disclosed. Relative disposition of individual harmonic generators of a cascaded harmonic generator in an optical path of the fundamental optical beam may be reversed. In a third harmonic generator, the fundamental optical beam may enter the third harmonic crystal first, and the second harmonic crystal second. When the fundamental optical beam enters the third harmonic crystal first, the fundamental light may remain non-depleted by second harmonic generation process.

Abstract: A method of generating light is disclosed. The method comprises: directing an optical pulse to a semiconductor optical amplifier being at a temperature above 0° C. The optical pulse is preferably characterized by a wavelength within an emission spectrum of the semiconductor optical amplifier and by a pulse area selected to induce Rabi oscillations in the semiconductor optical amplifier, and to emit light at a frequency of at least 1 THz.

Abstract: A ferrule of the invention includes: a ferrule main body having a front edge and a rear edge; a fiber insertion hole into which an optical fiber is to be inserted; a recess provided at a top surface of the ferrule main body, having a reflection surface converting an optical path of a front end of the optical fiber into an optical path of a light emission-launch end provided at a lower surface side of the ferrule main body; a light emission-launch portion provided on the optical path of the light emission-launch end at a lower surface of the ferrule main body; a locating pin provided closer to the front edge than the light emission-launch portion at the lower surface of the ferrule main body; and a recessed portion provided between the locating pin at the lower surface of the ferrule main body and the light emission-launch portion.

Abstract: A method for fabricating, and a structure embodying, a single-mode polymer wave guide array aligned with a polymer waveguide array through adiabatic coupling. The present invention provides a structure having a combination of (i) a stub fabricated on a polymer and (ii) a groove fabricated on a silicon (Si) chip, with which an adiabatic coupling can be realized by aligning (a) a (single-mode) polymer waveguide (PWG) array fabricated on the polymer with (b) a silicon waveguide (SiWG) array fabricated on the silicon chip; wherein, the stub fabricated on the polymer is patterned according to a nano-imprint process, along with the PWG array, in a direction in which the PWG array is fabricated, and the groove fabricated on the silicon chip is fabricated along a direction in which the SiWG array is fabricated.

Abstract: An integrated optical semiconductor device includes a substrate including first and second regions; a plurality of light receiving devices disposed in the second region; a multimode interference coupler disposed in the first region, the multimode interference coupler including output optical waveguides optically coupled to the corresponding light receiving devices; first and second conductive layers disposed on a back surface of the substrate in the first and second regions, respectively; and a plurality of capacitors disposed in the second region, each of the capacitors including a first electrode connected to one of the light receiving devices and a second electrode connected to the second conductive layer. The second conductive layer is electrically insulated from the first conductive layer. The substrate is made of a semi-insulating semiconductor. The multimode interference coupler and the light receiving devices include the same n-type semiconductor layer disposed on a principal surface of the substrate.

Abstract: Provided is a flat-top mode generating device. The flat-top mode generating device includes an input waveguide, a double-tapered structure connected to the input waveguide, and an input star coupler connected to the double-tapered structure. The double-tapered structure includes a first part having a first height hat is equal to that of each of the input waveguide and the input star coupler, and a second part disposed in the first part on the plane and having a second height that is less than the first height, the second part being tapered from the input star coupler toward the input waveguide.

Abstract: The present invention relates to frequency rulers. At least one embodiment includes a mode locked pump source operated at pulse repetition rate, and a pump output having a pump carrier envelope offset frequency. A nonlinear optical system outputs a frequency ruler spectrum comprising individual frequency modes. The frequency modes may be characterized by a frequency spacing which is an integer multiple of the repetition rate and by distinct ruler carrier envelope offset frequencies which exhibit at least one discontinuity across the frequency output. The ruler carrier envelope offset frequencies are substantially locked to the carrier envelope offset frequency of the pump laser. One preferred embodiment includes a frequency doubled, doubly resonant, non-degenerate OPO (DNOPO), a supercontinuum generation (SC) stage and at least one reference laser arranged downstream from a Tm fiber-based pump source. A plurality of beat signals generated therefrom provide for stabilization of the system.

Abstract: Pluggable connector including a connector housing having a leading end configured to mate with a receptacle assembly. The connector housing has an interior cavity. The pluggable connector also includes a communication assembly held by the connector housing. The communication assembly includes internal electronics located within the interior cavity, and a mating terminal located proximate to the leading end. The mating terminal is communicatively coupled to the internal electronics. The pluggable connector also includes a thermal-transfer assembly that is disposed within the interior cavity. The thermal-transfer assembly includes first and second thermal-transfer modules that each include a plurality of spaced-apart projections. The corresponding projections of the first and second thermal-transfer modules are interleaved with one another. The first thermal-transfer module is coupled to the internal electronics, and the second thermal-transfer module is coupled to the connector housing.

Abstract: An optical module includes a light emitting element, an optical fiber, a wavelength separating filter that is arranged at a predetermined angle with respect to a longitudinal direction of the optical fiber on a plane including the longitudinal direction of the optical fiber, and a lens for focusing light emitted from the light emitting element on the optical fiber via the wavelength separating filter. The light emitting element is arranged while being offset in a direction perpendicular to a central axis of the lens on a plane where the wavelength separating filter has the predetermined angle with respect to the central axis of the lens.

Abstract: An optical coupling system includes a first unit including a source of light or a first multi-core optical fiber, each of the source and the first multi-core optical fiber including at least a first aperture, a second unit including a second multi-core optical fiber including at least a second aperture corresponding to the first aperture of the first unit, and a lens array unit redirecting light between the first unit and the second unit, the lens array unit substantially matching light rays transmitted or received between the first aperture of the first unit and the corresponding second aperture of the second unit.

Abstract: A semiconductor laser diode with integrated heating generally includes a lasing region and a heating region integrated into the same semiconductor structure or chip. The lasing region and the heating region include first and second portions, respectively, of the semiconductor layers forming the semiconductor structure and include first and second portions, respectively, of the active regions formed by the semiconductor layers. Separate laser and heater electrodes are electrically connected to the respective lasing and heating regions for driving the respective lasing and heating regions with drive currents. The heating region may thus be driven independently from the lasing region, and heat may be conducted through the semiconductor layers from the heating region to the lasing region allowing the temperature to be controlled more efficiently.

Abstract: An optical fiber containing an alkali metal element and exhibiting low attenuation as well as excellent radiation resistance is provided. The optical fiber of the present invention has a core region and a cladding region enclosing the core region. The core region contains alkali metal elements by an average concentration of 0.2 atomic ppm or more. The attenuation at a wavelength of 1550 nm after irradiating with the radiation of 0.10 Gy or more of cumulative absorbed dose increases by 0.02 dB/km or less as compared with the attenuation exhibited prior to radiation exposure.

Abstract: An optical circuit for sensing a biological entity in a fluid and a method of configuring an optical circuit for sensing a biological entity in a fluid are provided. The optical circuit includes a sensing arrangement including a reference arm having a reference waveguide and a sensing arm having a waveguide; wherein lengths of the reference waveguide and the waveguide are configured in accordance with a temperature dependency reduction criterion.

Abstract: An apparatus includes an optical adaptor having monolithically integrated optical elements and first micro-mechanical features, the latter defining at least a first horizontal reference surface and a first vertical reference surface; wherein the first horizontal reference surface is perpendicular to an optical plane, the latter being perpendicular the optical axis of the optical elements; and wherein the first vertical reference surface is perpendicular to the first horizontal reference surface and parallel to the optical axis.

Abstract: An apparatus including a waveguide input coupler, a tapered branch waveguide, and a waveguide adaptor physically connected to the waveguide input coupler proximal end and to the branch waveguide proximal end. The waveguide input coupler includes a distal end having a distal end width and a proximal end having a proximal end width. The tapered branch waveguide includes a distal end having a distal end width and a proximal end having a proximal end width, the branch waveguide distal end width being greater than the branch waveguide proximal end width. The waveguide input coupler, the branch waveguide, and the waveguide adapter are configured to convert input light having a base transverse waveguide mode to output light having a higher-order waveguide mode.

Abstract: A traceable cable and method of forming the same. The cable includes at least one data transmission element, a jacket at least partially surrounding the at least one data transmission element, and a side-emitting optical fiber incorporated with and extending along at least a portion of the length of the cable. The side-emitting optical fiber has a core and a cladding substantially surrounding the core to define an exterior surface. The cladding has spaced apart scattering sites penetrating the exterior surface along the length of the optical fiber. The scattering sites scattering light so that the scattered light is emitted from the side-emitting optical fiber at discrete locations. When light is transmitted through the core, light scattered from the side-emitting optical fiber allows the cable to be traced along at least a portion of the length thereof.