Abstract: A method of transmitting a tributary in synchronous mode at the level of a link of a data network is disclosed. The tributary comprising at least one frame including at least one payload envelope area and one transport overhead area. The envelope area includes at least one payload and load supervision data related thereto. The transport overhead area includes transport supervision data related and an area of fixed patterns. The method comprises modifying a frame to create a modified frame and transmitting the modified frame. Modifying the frame comprises: part of the fixed patterns are deleted from the fixed pattern area; the positions of the part of the fixed patterns deleted are recorded; replacement data are inserted at the level of the positions. The method is characterized in that the replacement data comprise the transport supervision data of the frame of the tributary.

Abstract: A process for transmitting data on an optical fiber including multiplexing in wavelength signals coming from a plurality of monochrome transmitters, each of which has its own wavelength, and modulating information to be transmitted by a carrier realized per channel, wherein timing (clocking) of each transmitter is controlled by a common clock.

Abstract: The invention relates to a method of transmitting at least one tributary in synchronous mode at the level of a link of a data network, said tributary comprising at least one frame in the SDH or SONET format, said frame comprising at least one payload envelope area and one transport overhead area, said payload envelope area comprising at least one payload and load supervision data related to the payload, said transport overhead area comprising at least transport supervision data related to transport and an area of fixed patterns comprising fixed patterns, said method comprising steps of:—modifying said frame so as to generate a modified frame; transmitting said modified frame, the modification comprising steps in which:—part of said fixed patterns are deleted from said fixed pattern area; the positions of said part of the fixed patterns deleted are recorded; replacement data are inserted at the level of said positions, the method being characterized in that said replacement data comprise the transport supervis

Abstract: An optical transceiver device having multiple communication related functions is integrated into a single module, as well as capabilities for integrating a DSP and optical side send/receive processing. The optical transceiver device provides client-access and line-access operations on the optical layers for traffic control and security, and enables parallel implementation.

Abstract: A process for transmitting data on an optical fiber including multiplexing in wavelength signals coming from a plurality of monochrome transmitters, each of which has its own wavelength, and modulating information to be transmitted by a carrier realized per channel, wherein timing (clocking) of each transmitter is controlled by a common clock.

Abstract: To solve a problem of modularity favoring under-equipping and a problem of energy losses in an all-optical distribution frame for optical lines, a primary converter block includes a redundancy circuit which can emit an optical signal with a wavelength different from any of the other wavelengths broadcast by the other converter circuits of the primary block. In this case a star coupler responsible for frequency domain cross-connection of the signals preferably includes P+1 input channels for P output channels.

Abstract: The present invention is a device to increase the bit rate and distance at which data can be transmitted by optical fiber. The device compensates the polarization dispersion of the line by processing a received optical signal with the use of a polarization controller, the generation of a differential group delay between two orthogonal polarization modes and a control unit for the polarization controller. The data that is sent is redundant to enable detection of errors affecting the data received and the control unit is adapted to minimize the error rate calculated in real time by using the redundant data. The application of the device is to long-haul optical transmission, in particular over stranded fibers.

Abstract: The matrix comprises: a first stage having r switch modules each having 2p2 inlets and 2p.r outlets; and a second stage comprising r switch modules each having 2p.r inlets and 2p2 outlets. The outlets of the first stage are connected to inlets of the second stage via links which are mutually parallel in groups of 2p links, thereby reducing the number of crossover points, and thus reducing size. If the matrix is implemented using photonic technology, these links are implemented by means of optical fiber ribbons. The invention is applicable to photonic switch networks.

Abstract: The matrix comprises:

Abstract: A protected optical switch matrix having N inputs and N outputs and including an optical switching fabric (S2-S2′), an input interface (S1) performing wavelength conversion and an output interface (S3) performing wavelength filtering. The input interface (S1) and the output interface (S3) are protected by redundancy provided by r redundant units for E working units where r is a number very much less than E.

Abstract: A protected optical switch matrix having N inputs and N outputs and including an optical switching fabric (S2-S2′), an input interface (S1) performing wavelength conversion and an output interface (S3) performing wavelength filtering. The input interface (S1) and the output interface (S3) are protected by redundancy provided by r redundant units for E working units where r is a number very much less than E.

Abstract: To increase the bit rate at which and the distance over which data can be transmitted by optical fiber, the device compensates the polarization dispersion of the line by processing the received optical signal by means of a polarization controller, means for generating a differential group delay between two orthogonal polarization modes and a control unit for the polarization controller. The data that is sent is redundant to enable detection of errors affecting the data received and the control unit is adapted to minimize the error rate calculated in real time by means of said redundant data. Application to long-haul optical transmission, in particular over standard fibers.

Abstract: A system for re-establishing the transmission quality of a digital information transmission link including amplifier equipments in the event of failure of one or more amplifier equipments includes, associated with at least one of the amplifier equipments, a gain control device for varying the gain of the amplifier equipment in order to compensate for deterioration of the receive signal-to-noise ratio following failure of at least one other amplifier equipment. An error corrector coder at the send end of the link operates on the digital information to be transmitted and an error corrector decoder at the receive end of the link operates on the received digital information. The error corrector code used by the error corrector coder and decoder reduces or eliminate residual errors at the receiving end associated with residual deterioration of the receive signal-to-noise ratio not compensated by varying the gain.