Abstract: An optically amplifying waveguide guides both the LP.sub.01 and the LP.sub.02 mode. Its erbium distribution profile is preferentially matched with the modal field distribution of the LP.sub.02 mode. The waveguide is provided with long period perturbations of a pitch and strength that resonantly couples signal power of different wavelengths from propagation in the LP.sub.01 mode to propagation in the LP.sub.02 mode and back again to propagation in the LP.sub.01 mode whereby the longitudinal distribution of gain along the waveguide at one wavelength is longitudinally displaced with respect to that at least one other wavelength.

Abstract: A system and method providing a wavelength locker is disclosed. The method and system provide a high uniformity, low polarization sensitivity optical coupler. The optical coupler further comprises a first outer fiber and a second outer fiber. The first outer fiber and the second outer fiber each have a first portion. The method and system further provide a filter coupled to the first portion of the first outer fiber. The method and system further provide a first mechanism coupled to the filter for detecting intensity and providing a first resultant. The method and system further provide a second mechanism coupled to the second portion of the second outer fiber. The second mechanism detects intensity and provides a second resultant.

Abstract: A cross-connection device has two three-port optical circulators for being supplied with wavelength-division-multiplexed optical signals each having a plurality of wavelengths from respective input ports, a fiber grating mirror inserted between the three-port optical circulators, for reflecting only an optical signal having a certain wavelength and passing optical signals having other wavelengths, a fiber grating mirror controller for controlling the wavelength reflected by the fiber grating mirror, and two output ports for outputting cross-connected wavelength-division-multiplexed optical signals from the optical circulators. The fiber grating mirror controller controls the temperature and pressure applied to the fiber grating mirror to select the wavelength reflected by the fiber grating mirror.

Abstract: A communication cable, which has a cable core provided in the center as well as outside cladding and strain relief elements applied in the region of the outside cladding, has at least one optical transmission element which includes at least one light waveguide, provided in the region of the strain relief elements.

Abstract: The invention relates to an optical integrated circuit for bidirectional communications which is able to achieve a downsizing and high integration with the production cost thereof decreased. An optical waveguide circuit is formed on a substrate and a photo diode (PD) is connected to the outgoing end side thereof. The optical waveguide circuit has a circuit of an optical wavelength division multiplexer which causes communication signal light (.lambda.1) inputted from a bidirectional light input/output port to be transmitted through a communication light selective transmission filter and to be outputted from a communication light output port and causes non-communication light (.lambda.2) to be reflected by the communication light selective transmission filter and to outgo through a non-communication light output port. A piezoelectric element is provided on the upper part at the outgoing side of the communication light output port.

Abstract: A WDM optical circuit includes an optical circulator having a first path from a first port to a second port and a second path from the second port to a third port. The optical WDM signals received from the second port of the optical circulator are separated out by a WDM coupler on wavelengths, respectively. One of the optical signals on a selected wavelength is dropped and a new signal is added on the same wavelength by an optical transceiver.

Abstract: A faceplate for a front edge of a printed circuit board has a detachable carrier for supporting an optical fibre connector adapter. The carrier has open and closed positions. When the carrier is in the closed position, a front portion of the adapter extends through an opening formed within the faceplate. To remove the adapter, the carrier is pivoted along a wall of the faceplate. When the carrier has been pivoted approximately 90 degrees from the axis of the faceplate, the carrier can be lifted out of the faceplate, and the adapter can be removed from the carrier if desired. According to another embodiment, allowing access to the adapter from the front of the faceplate, the adapter is removably retained in a mounting within the faceplate by a retaining spring. A door, pivotable from below the mounting, has an open and closed position.

Abstract: The present invention relates to a device for both-way transposition between optical signals and electrical signals, for a communications system, said device comprising a vertically integrated component comprising an optically driven oscillator based on a negative differential conductance mechanism, for performing optical-to-millimetric conversion on the down path, and an asymmetric Fabry-Perot cavity modulator for performing the electrical-to-optical conversion function on the up path.

Abstract: An optical fiber cable management device includes a modular side wall construction, and a plurality of slideable and rotatable cable management trays disposed within the device. The trays can be configured for both termination and storage, storage only, and for supporting cable components. One or more slideable drawers are also provided within the device. The device provides cable termination, splice and storage of the optical fiber cables.

Abstract: A cable assembly fitting is provided to connect fiber optic to optoelectronic equipment. An elongated housing includes a front end, a back end and an axial bore extending between the front and back ends. The axial bore further defines a first portion, a second portion, and an intermediate stepped portion. A cap is fit into the back end of the housing. Fiber optic cable is contained within a cable jacket and has fibers protruding therefrom. The fibers have a mediate span and rigid sleeve thereon. A water impervious barrier is positioned adjacent the rigid sleeve. A shrink tubing is disposed around the fiber optic cable.

Abstract: An optical switch 10 has a first waveguide I arranged in a first set, 2.sup.N waveguides in a second set, and N number of successive refractive elements between ends of the waveguides and a reflector 9, wherein an output signal is coupled to any of the 2.sup.N waveguides by pivoting said refractive elements to selected binary states.

Abstract: A gas-insulated cable includes a plurality of sections separated by sealed partitions, each section including a cylindrical steel case, a cylindrical aluminum screen coaxial with and inside the case and three conductors. A monitoring device includes, between the case and the screen, optical fibers equal in number to the number of sections of the cable and extending from one end to the other of the cable, each of the sections being monitored by a single fiber. The monitoring device further includes at least one optical internal arc detector inserted in series into each fiber in the corresponding monitored section, at each end of the device, a device for detecting light conveyed by the optical fibers, and at least one optical threshold temperature detector inserted in series into each fiber in the corresponding monitored section.

Abstract: A panel for managing fibres to be routed to an equipment bay, where the panel has a closed position, allowing limited or no access to the fibres, and an open position, allowing access to the fibres. The panel has a movable spool for maintaining approximately a constant amount of slack in the fibres as the panel moves from the open position to the closed position or from the closed position to the open position.

Abstract: An optical network includes a head-end station connected to a plurality of optical network units via an optical fiber network having a plurality of split levels. One level of split is constituted by a n:1 repeater provided with a monitor for ranging and leveling transmissions from the optical network units.

Abstract: A coupling arrangement for optically coupling together, in a self-aligning fashion, inputs and outputs of an optoelectronic integrated circuit module and end faces of optical fibers with the module being arranged with a plane support surface flat on a plane bearing surface of a holder for holding fibers and a stopping device is provided for limiting a relative displacement between the module and the holder at a point at which the mutually-assigned end faces and inputs and outputs of the module are situated opposite one another. The electrical contacting of the module is performed by a continuous opening in the holder so that contacts extend through the opening to engage a surface of the module.

Abstract: An electric and/or optical submarine cable arrangement which bridges the weight/strength gap that exists between armoured and unarmoured cable. A stranded armour layer (6) comprises alternate strands of steel wire (7) and polymeric filler (8). Such a cable has sufficient strength to support a section of heavy armoured cable joined to it during laying in water of a depth exceeding 2 km, but light enough that an unarmoured cable can support it in deep water.

Abstract: A low-loss optical 1.times.2 branching element comprises a symmetrical coupler (C.sub.s) with a symmetrical power distribution (1/2/1/2) and an asymmetric coupler (C.sub.a)with an asymmetric power distribution ({(1/2-x)/(1/2+x)}). Outputs (c,d) of the symmetrical coupler are coupled to inputs (e,f) of the asymmetric coupler, so that an MZ interferometer with two branches (t.sub.1, t.sub.2) is formed between the two couplers. The branches incorporate, preferably identical, optical non-linear elements (NL1, NL2), while moreover the branches exhibit an additional difference in linear optical path length (.DELTA.L) that depends on the type of couplers selected. In one signal direction (arrow D) the branching element acts as a 3 dB splitter. The elements (NL1, NL2) and the coupler (C.sub.a) have been dimensioned so as to result in a loss <<3 dB for a given signal power in the other signal direction (arrow U).

Abstract: There are provided a first optical waveguide having a first curved portion, a second optical waveguide having a second curved portion that extends along and is disposed inside the first curved portion, a third optical waveguide having a third curved portion, an end portion of the third curved portion being connected to both end portions of the first and second curved portions.