Abstract: It is an object of the present invention to enhance laser beam transmitting efficiency by accurately controlling an interval between a light emitting (light receiving) element (20) and an optical wave-guide substrate (1) without causing any fluctuation in the interval in a mounting structure of the light transmitting element in which the light emitting (light receiving) element (20) is mounted on the optical wave-guide substrate (1). When the light emitting (light receiving) element is joined to the sub-mount chip (4) and when the sub-mount chip (4) is joined to the optical wave-guide while the element is being directed to the substrate side, the sub-mount chip and the optical wave-guide substrate are joined to each other by the solder bump (6). A post (5) is arranged for regulating an interval between the light emitting (light receiving) element and the optical wave-guide substrate.

Abstract: A lower clad, cores, and an upper clad are formed by a chemical vapor deposition method (CVD method). At least one of the additional amount of oxygen, the additional amount of nitrogen, and the additional amount of silicon of a silicon oxynitride film is adjusted so that the cores have a desired higher refractive index than those of the clads. Further, end point detectors are formed which become etching stoppers of dry etching in pattern forming the cores.

Abstract: An enclosure for facilitating and protecting splices or connections between communication transmission mediums can include a housing having a first port and a drop port. The first port can allow a distribution cable containing a transmission medium to enter the housing. The drop port can allow another transmission medium to enter the housing, and it can allow a transmission medium to be added or removed without disturbing existing transmission mediums or connections in the housing. A drop plug can be provided to seal the drop port. The enclosure can also include a cover plate having a gasket coupled to its perimeter and being removable with the cover plate. Strain relief for the transmission mediums entering the enclosure can also be provided. Two-stage strain relief and single-stage strain relief can be provided for the transmission mediums entering through the first port and the drop port, respectively.

Abstract: An attenuating device for attenuating optical power of a light beam, comprises an at least partly absorbing element adapted to receive and attenuate the optical power of the light beam, and a supporting element for supporting on at least one side the at least partly absorbing element. The at least partly absorbing element comprises at least one layer coated or evaporated on the supporting element with an increasing, decreasing, or varying thickness. The supporting element is provided with a material having a crystalline structure to provide compensation to a local heating in the at least partly absorbing element resulting from absorption of the light beam.

Abstract: Optical coupler apparatus having reduced geometry sensitivity includes spaced apart first and second main waveguides having a coupling section. In one embodiment, first and second side waveguide sections are arranged in the coupling section adjacent outer sides of the first and second main waveguides to allow evanescent coupling between the main waveguides and side waveguide sections. Methods of fabrication and operation are also described.

Abstract: A ruggedized optical rearrangement device is provided. The device includes an input side having multiple separate flexible input light guide arrays, each of the arrays including multiple light guides. The device also includes an output side in which the light guides are repositioned to form multiple flexible output light guide arrays. A tube positioned between the input and output sides protects a transition region of the plurality of light guides. Adapters are positioned at each end of the tube, and at least one flexible strength element associated with the light guide arrays is connected to the adapters to prevent damage to the light guides. A method for ruggedizing an optical rearrangement device is also provided.

Abstract: An optoelectronic coupler includes two photodiodes and an optic light guide, where one of the two photodiodes serves as the transmitting diode and the other as the receiving diode and the light guide serves to guide the light emitted by the transmitting diode to the receiving diode. The transmitting diode and the receiving diode are mounted on a circuit board at a distance from each other and the light guide is constituted of a plastic or glass element mounted on the same circuit board. This arrangement provides for a simple optoelectronic coupler design that permits safe operation even from the perspective of explosion protection.

Abstract: An optical packaging arrangement combines a planar lightwave circuit (PLC) having an array of waveguides thereon, an array of photodetectors on a substrate to receive light beams coupled out of the PLC by the output ports, and a collimating faceplate, having a plurality of glass cores, extending between the PLC and the photodetector array for coupling the output light beams to respective photodetectors. The faceplate forms a cover for a hermetic cavity encompassing the photodetectors. The PLC is disposed either co-planarly with the faceplate or transversely to it. Light from the PLC is tapped via a plurality of taps formed on the PLC for coupling to the photodetectors.

Abstract: The invention is directed to different methods for controlling the positions of the guided modes of the photonic crystal waveguides. Methods based on both rearrangement of the holes and changing the size of the holes are presented. We have observed and explained the appearance of acceptor-type modes and the donor-type waveguides. The ability to tune frequencies of the guided modes within a frequency bandgap is necessary in order to achieve efficient guiding of light within a waveguide (reduced lateral and vertical waveguide losses) as well as to match frequencies of eigen modes of different photonic crystal based devices in order to have good coupling between them.

Abstract: A sensor embedded in a high temperature metal is incorporated into a sensing system for measuring temperature, strain, or other properties of a metal structure. An optical system transmits light to and receives output signals from the sensor for analysis. With rotating structures, an optical fiber lead transmits light between the sensor and external surface of the structure along its rotational axis, allowing the lead to remain fixed with respect to the optical system as the structure rotates at high speeds.

Abstract: An optical switch uses a walk-off crystal together with a Wollaston prism, a Faraday rotator, and a halfwave plate pair and a single collimating lens of one multiple-fiber pigtail for both input and output optical beams. In one embodiment, an input beam enters the device through one port of a tri-fiber pigtail, and a switched beam exits the device through a second or third port of the same tri-fiber pigtail, depending on a state of the Faraday rotator. All three beams use the same pigtail and collimating lens.

Abstract: An optical device (300) including first and second facets (340, 350); an at least partially bent waveguide (320) formed on a substrate and including a portion perpendicular to the first facet; and a light amplification region (310) coupled to the bent waveguide. The light amplification region includes an expanding tapered portion and a contracting tapered portion which approaches the second facet.

Abstract: An optical device includes a small and low-cost variable polarization plane rotator that can control a rotation angle of the polarization plane easily. A variable polarization plane rotator is provided with a ?/4 phase plate having an optical axis in the same direction as, or at a 90 degree angle relative to, a polarization direction of an input light beam. A phase difference variable element has an optical axis at a ±45 degree angle relative to the optical axis of the ?/4 phase plate, to apply a variable phase difference between the polarization components parallel to and perpendicular to the optical axis thereof. A phase difference adjustment section adjusts the variable phase difference of the phase difference variable element, wherein the input light beam after being transmitted through the phase difference variable element to form elliptically polarized light or circularly polarized light, is transmitted through the ?/4 phase plate to form linearly polarized light.

Abstract: An optical fiber array with lenses connected with a plurality of optical fibers is disclosed, enabling to be manufactured to meet the optical fiber end intervals to the terminal intervals of an optical device to be connected and having an improved efficiency in connection operation. The optical fiber array comprises a base plate having a first end surface and a second end surface opposite to the first end surface, a plurality of optical fibers having a tip surface inserted and secured in each of the holes opened on the base plate, and a plurality of collimator lenses installed on the second end surface facing the tip surfaces of the optical fiber. Each hole has a tapered inside wall having a diameter gradually decreasing from an opening on the first end surface of the base plate toward the second end surface and a parallel inside wall continuing from the tapered inside wall end.

Abstract: An optical waveguide structure has lines (2), crossings (3), and branchings (4). In the area of the branchings (4), the waveguide structure consists of planar waveguides made of a waveguide material that is put into troughs (7) formed into a substrate (8). The waveguide material has a higher refractive index than the material delimiting the troughs (7). In the area of said crossing (3) the waveguide structure consists of fibers (5) which cross in the area of the crossings.

Abstract: A compensating optical fiber length having a negative chromatic dispersion slope, the compensating optical fiber having a core region surrounded by a cladding region, the cladding region defining a first ring of holes, which substantially defines, around the core region an annulus with an inner radius r1 and an outer radius r2, and at least one second ring of holes that surrounds the first ring of holes, the holes running along the compensating optical fiber longitudinally and being spaced apart from each other substantially according to a predefined pitch ?, wherein a) r1??/n?r2 where n is the refractive index of the material making up the core region of the compensating optical fiber length; b) the holes of the first and the at least one second ring are substantially of the same diameter d; and c) the ratio d/? substantially satisfies the following relationship (A) 0.8?d/?<1.

Abstract: A waveguide structure includes a glass body and a waveguide pattern formed in the glass body by irradiating a predetermined track on the glass body with sufficient energy to grow a crystalline phase along the predetermined track.

Abstract: The present invention aims at providing a connecting method capable of suppressing an influence of stray light for a plurality of optical function devices formed on the same substrate, and an optical apparatus applied with the control method. To this end, in the connecting method of optical function devices according to the present invention, the plurality of optical function devices formed on the same substrate are cascade connected so that both ends of an optical path passing through the plurality of optical function devices are positioned on the same end face of the substrate. According to such a connecting method, it becomes possible to effectively suppress a leakage of stray light from an optical input side to an optical output side.

Abstract: An optical router comprises a substantially planar substrate, a stator fixed to and projecting from an upper surface of the substrate, and a rotor surrounding the stator so as to be rotatable about the stator. At least one optical guiding component is formed in or on the rotor. A substantially planar layer is provided on the substrate surrounding the rotor and has a plurality of optical waveguides formed therein, the waveguides opening at least one end onto a space surrounding the rotor. The stator rotor, and planar layer are formed on the substrate by a series of deposition and etching steps such that the rotor may be rotated about the stator so as to align the optical guiding component with one or more of the waveguide openings.

Abstract: An optical fiber connector in which a terminus assembly (20) can be keyed so it is always installed in a predetermined rotational position about the axis of a terminus-receiving passage (18) of a housing (12). When a terminus rotational position is found that results in minimal insertion loss, a noncircular index sleeve (40) is placed around the terminus body (24) and fixed thereto. An indexing plate (70) is installed in the connector housing, with indexing passage portions (72) that receive the index sleeve at only a single rotational position of the indexing sleeve about the passage axis.