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1. (WO2001031825) OPTICAL TRANSMISSION SYSTEM WITH SDH OR FEC ENERGIZING SIGNALS, WITH OPTIMISED SUBCARRIER OVER-MODULATION

Pub. No.:    WO/2001/031825    International Application No.:    PCT/FR2000/002972
Publication Date: Fri May 04 01:59:59 CEST 2001 International Filing Date: Thu Oct 26 01:59:59 CEST 2000
IPC: H04J 14/02
H04Q 11/04
Applicants: ALCATEL
NOIRIE, Ludovic
BISSON, Arnaud
BRUYERE, Franck
BEYLAT, Jean-Luc
Inventors: NOIRIE, Ludovic
BISSON, Arnaud
BRUYERE, Franck
BEYLAT, Jean-Luc
Title: OPTICAL TRANSMISSION SYSTEM WITH SDH OR FEC ENERGIZING SIGNALS, WITH OPTIMISED SUBCARRIER OVER-MODULATION
Abstract:
The invention concerns an optical transmission system, wherein the energizing signals are transmitted in the form of synchronous digital hierarchy (SDH) signals or forward error correction (FEC) signals. The transmission system comprises a transmission channel, typically a supervisory channel, having a lower rate than that of the energizing signal; said channel is transmitted by over-modulation of a subcarrier. The frequency of the subcarrier is selected so as to limit demodulation errors in the subcarrier due to the energizing signal harmonics.