Abstract: The invention describes a transmission component for producing chromatic dispersion which can be predetermined, having a glass fiber optical waveguide in which it is possible to carry not only the LP01 fundamental mode but also at least one LPmn mode, and two pairs of Bragg gratings (gratings 1 and 2, as well as 3 and 4), of which at least one pair has chirped Bragg gratings, in which the first Bragg grating in each pair reflects the arriving light beam back to the other Bragg grating in a direction approximately opposite the incidence direction, and from which other Bragg grating the light beam emerges in, or at least parallel to, the original incidence direction.

Abstract: An optical connector which includes an insertion opening for inserting therein a plug section of an optical fiber cable. There is an optical element which is to be optically connected to the optical fiber cable as inserted in the insertion opening, and a shutter for opening and closing the insertion opening. The shutter is to be mounted to an apparatus and serves as a connector to the apparatus. The shutter is arranged so as to be distinguishable from an optical connector of other type by the color of the shutter which is exposed to the outside when mounting the optical connector to an apparatus.

Abstract: A fusion splicing apparatus for fusion splicing end portions of optical fiber by butt discharging. Parameter data of a brightness distribution waveform of optical fiber in cross section is measured from a picked up image. A degree of attribution for the measured parameter data is obtained from fuzzy operation data registered in advance, and the type of the optical fiber is identified through a fuzzy operation. The identified type of the optical fiber is collated with fusion splicing conditions for type of optical fibers registered in advance. The collation result is displayed.

Abstract: An end face 7a of an optical fiber 7 and an end face 8a of an optical fiber 8 are arranged so as to have a predetermined interval and to oppose each other in a V-groove 23 of a base 21. A solution 27 including particles used as a material of the photonic crystal is dropped into a space section 25 which is formed by the end face 7a, the end face 8a, and the V-groove 23. Accordingly, by growing the photonic crystal from each of the end face 7a and the end face 8a, the optical control section including the photonic crystal 2 is formed on each of the end face 7a and the end face 8a.

Abstract: The invention features an optical chip having optical functions in large mode size waveguides. Under one aspect of the invention, the optical chip features one or more large mode field size waveguides, one or more low minimum bending radius waveguides to interconnect the large mode field size waveguides, and one or more optical functions integrated within or connected to the large mode field size waveguides.

Abstract: Photosensitivity of an inner core which is disposed in a central portion of a core is low. Photosensitivity of an outer core which is disposed close to a cladding is high. In the cladding, photosensitivity of the inner cladding which is close to the core is high and photosensitivity of an outer cladding which is outside of the inner cladding is low. A plurality of slant optical fiber grating having different optical characteristics by using the optical fiber having such photosensitivity so as to form a gain equalizing optical filter. By doing this, it is possible to provide an optical filter having a slant optical fiber grating which can maintain a filtering characteristics in a narrow bandwidth and enlarge loss area.

Abstract: An apparatus for demultiplexing optical signals at a large number of wavelengths using at least one wavelength-selective filter includes at least two wavelength-selective filters in each case for separation of signal components at one wavelength or at two or more wavelengths, located one behind the other in an oblique configuration in the beam path of the apparatus, and disposed such that the signal component that is transmitted by a first filter falls on the subsequent, second filter, the signal component that is reflected by the second filter not being reflected back to the first filter but, instead, running past the first filter, and the signal components that are reflected by the filters are joined together.

Abstract: A practical optical waveguide circuit is provided which includes many intersections but is low loss. The width of a waveguide core is w1 at input and output terminal sections and w2 at an intersecting section, where w2>w1. The core width of the intersecting section is made different from that of the input and output terminal sections, or the core height of the intersecting section is made different from that of the input and output terminal sections. The core width is smoothly varied between the intersecting section and the input and output terminal sections by a tapered section. When the number of the waveguides intersecting with the intersecting section is 100, the intersection loss is 5.8 dB for the conventional device where w2=w1=5 ?m, but is 1.8 dB when w2=12 ?m, thereby being able to reduce the intersection loss sharply.

Abstract: A high-speed high-isolation fiber-optic matrix switch using only one acousto-optic device with phased array transducers is disclosed. Previously disclosed fiber-optic switches either required spatially separated more than one acousto-optic devices making them complex, hard to align and expensive or could not achieve high-isolation and low-insertion loss performance. A simple structure of 2×2 fiber-optic matrix switch with one phased array transducer as disclosed here is expected to make acousto-optic based fiber-optic switches more attractive than similar MEMs based switches. Use of shared lens instead of individual lenses at the input and output fiber array is expected to further reduce complexity and cost of the acousto-optic based fiber-optic switches.

Abstract: An optical fiber is disclosed in which the core region of the optical fiber is doped with Cl and F in order to reduce the viscosity mismatch between the core region and the adjacent cladding region. In one embodiment of the invention, the optical fiber is a single-mode step index optical fiber having a core region doped with Cl and F in an amount effective to produce a difference in temperature between the glass transition temperature of the core region and the glass transition temperature of the adjacent cladding region of less than about 200° C.

Abstract: A light collector for use with an illumination system, particularly an automotive interior illumination system. The light collector includes several waveguides capable of conducting light through internal reflection with the waveguides being arranged in a stacked configuration. Each waveguide includes an angled input surface at least some of which are oriented at different angles. With this arrangement, light from a single light source can be collected and routed to several locations.

Abstract: The present invention relates to a modular cassette for coiling and holding splices between conductors, the cassette comprising: a base module substantially occupying a plane, the module having a conductor entry passage leading to first conductor coiling means and first holding means for holding splices between conductors; second conductor coiling means; and a first additional module receiving conductors, the additional module substantially occupying the same plane as the base module and being secured to the base module by releasable connection means. The base module of the invention contains said second coiling means and the first additional module of the invention contains holding means for holding connections being conductors.

Abstract: Apparatus using mechanically-actuated evanascent wave coupling. At least a portion of an optical waveguide is integrated onto a substrate, and an optically active element is physically moved relatively to each other, with the result that propagation parameters for the waveguide are substantially altered. The optically active element may be a resonator or another waveguide. Altered propagation parameters can be used to cause an optical wave to be transformed in response to an electromagnetic signal. Physical parts of the apparatus can vary widely in both size and tolerance. The optically active element is mechanically actuated relative to a position of the optical waveguide.

Abstract: An optical module has a high-frequency circuit substrate; at least one optical semiconductor device mounted on the high-frequency circuit substrate; and an optical waveguide substrate arranged on the high-frequency circuit substrate.

Abstract: A device for filtering at least a predetermined selected optical signal having a predetermined wavelength range from a series of optical signals, the device comprising: a polarisation alignment means for substantially aligning substantially orthogonal polarisation states of an optical input signal so as to produce a polarisation aligned optical signal; a polarisation manipulation means for imparting a controlled polarisation manipulation to the polarisation aligned optical signal so as to output a polarisation manipulated optical signal having one of at least two distinguishable polarisation states including a first polarisation state and a second polarisation state; and an optical separation means for spatially separating the selected optical signal from the series of optical signals when the polarisation state of the polarisation manipulated optical signal is in a first polarisation state, thereby forming a first and second output optical signal, and maintaining the spatial alignment of the selected optical

Abstract: An optical fiber suitable for the WDM transmission in the wavelength bands of 1.31 ?m and 1.55 ?m is provided. An optical fiber is characterized by a zero dispersion wavelength of longer than 1330 nm and shorter than 1430 nm, a dispersion of not less than 6 ps/nm/km and not more than 15 ps/nm/km at a wavelength of 1550 nm, a ratio of a dispersion to a dispersion slope of not less than 200 nm and not mare than 400 nm at a wavelength of 1550 nm, a dispersion of not more than ?1 ps/nm/km and not less than?8 ps/mn/km at 1300 nm, and a cutoff wavelength of 1300 nm or shorter.

Abstract: A nonmetallic, nonconductive strength member for use in a cable or as a component of a strength reinforcement system of a cable is provided. The strength member is constructed of low cost materials and includes multiple glass fibers coated with a coating composition. The strength member provides flexibility and high tensile strength. The strength member exhibits low smoke generation and low flammability properties. The coating composition includes at least a lubricant that imparts a substantially smooth surface and a low coefficient of friction to the glass fibers to help facilitate processing of the strength member(s) during cabling and stranding procedures. The coating composition also includes at least an adhesive component that helps to substantially adhere the glass fibers together and helps to form the glass fibers into the strength member. The strength member can be configured as a yarn or as a strand for incorporation within a cable and/or for arrangement with one or more cable components.

Abstract: An arrangement for measuring the true position of a diaphragm within a diaphragm valve assembly utilizes an optical probe in conjunction with a reflective surface formed on the backside of the diaphragm membrane. An optical test signal is launched from a source (such as an LED or laser) along a waveguide (such as an optical fiber) so as to impinge upon the reflective surface of the membrane. The reflected test signal is then coupled back into the waveguide and directed toward an optical receiving device. The received optical signal is translated into an electrical signal that is used as an indication of the “state” of the diaphragm. That is, as the diaphragm membrane moves between the “open” and “closed” position, the membrane surface will be deformed and thus modify the amount of reflected optical signal that is directed back into the probe. Therefore, the true position of the diaphragm can be determined by monitoring the generated electrical signal from the optical probe.

Abstract: The invention is an optoelectronic device and method of fabrication where at least two optical devices are formed on a single semiconductor substrate, with each optical device including an active region such as a multi-quantum well region. The active devices are spatially separated and optically coupled by a passive waveguide formed over the substrate which provides butt joints with the active regions. The butt joints can be optimized independently from the active regions thus improving yield.

Abstract: A first transmitting section frequency-multiplexes a data signal and a monitor signal, and then converts the resultant signal to an optical signal for output. A first receiving section converts the optical signal transmitted via a first optical transmission path and a wavelength demultiplexer into an electrical signal, and then extracts the monitor signal. A difference detector compares a monitor signal level with a predetermined reference level, and then outputs wavelength information to a second optical transmission path. Based on the wavelength information transmitted via the second optical transmission path, a first wavelength controller adjusts the wavelength of the optical signal for stabilization at a predetermined wavelength. Thus, it is possible to achieve a wavelength division multiplex transmission system capable of controlling the wavelength of the optical signal at low cost.