Alcatel

Alcatel Lucent

Nokia Solutions and Networks Oy

Arnaud Dupas

Dominique Chiaroni

Thierry Zami

Denis Penninckx

Nicolas Le Sauze

Vinod Kumar

Daniel Popa

Wolfram Lautenschläger

Dusan Suvakovic

Patricia Layec

Roger Boislaigue

Eric Dutisseuil

Peter Vetter

Proposed is a bit-interleaver for an optical line terminal of an optical access network. The bit-interleaver contains a memory reader, that provides data streams at bit level to a space-time switch. The space-time switch reads within one input cycle up to N bit sets from the data streams. The switch switches within one writing cycle up to N bits onto up to its output ports, which provide respective output vectors. A number of N OR-function elements determine within the writing cycle respective single output bits. A number of N memory elements write within the one writing cycle a respective one of the output bits into a respective one of their bit sub-elements. A control unit that controls the reading of the data streams and also the switching of the bits by the switch. The control unit controls a choice of the writing addresses.

Bit-interleaver for an optical line terminal

The present invention relates to a method for demultiplexing MAC service data units encapsulated into MAC protocol data units, said MAC service data units comprising IP protocol data unit wherein said method comprises the following steps:

Method and equipment for demultiplexing variable size protocol data units

A Laser device for optical packet data transmission in TDM-systems is provided. The device comprises a laser light source for outputting laser light beam and a laser driver for driving the laser light source; an optical modulator which receives and modulates the laser light beam output by the laser light source; a packet data source for outputting a packet data stream; and a modulator driver for receiving the packet data stream output by the packet data source and for driving the optical modulator in response to the packet data stream resulting in that the optical modulator modulates the laser light beam in response to the packet data stream. A filter generates an envelope signal of the data packets in the packet data stream, and a switch switches the laser driver in response to the envelope signal.

Laser device for optical data transmission

The network comprises an optical ring link (F) and a concentrator (HUB) that sends via one end of the link 'downlink' optical signals carried by respective wavelengths and receives 'uplink' optical signals via the other end of the link. The link is divided into a plurality of segments (FS-FS) separated by access nodes (AN-AN) for receivers (RX) of downlink optical signals and for senders (TX) of uplink optical signals. Each access node comprises coupling means that are not wavelength-selective for coupling the segment on the upstream side of the node to the segment on the downstream side and to the receivers and to couple the senders (TX) to the segment on the downstream side. The downlink optical signals are carried by wavelengths belonging to a set of predefined wavelengths. To optimize the use of spectral resources, a rejection filter (NF) is inserted into a segment to reject a portion of the wavelengths of said set of wavelengths. The senders (TX) of stations associated with nodes on the downstream side of the segment then adapted produce uplink optical signals carried by respective wavelengths rejected by the rejection filter (NF). The invention is applicable to optical metropolitan access networks in particular.

Optical ring transmission network

A decision system for a modulated electrical signal delivered by a converter in response to a received modulated optical signal compares the amplitude of the electrical signal to a reference level, measures an average amplitude of the electrical signal, and generates the reference level as a function of the result of such measurements so that the 'reference level/average amplitude' ratio can be adjusted to a predetermined constant value different from 1. Applications include receivers for optical packet transmission systems.

Decision system for modulated electrical signals

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St Michel sur Orge, France

Arnaud Dupas