Method for adjusting time delays and device for...

Optical communications – Transmitter and receiver system – Including synchronization

Reexamination Certificate

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C398S161000, C398S097000

Reexamination Certificate

active

10028919

ABSTRACT:
The invention is also related to devices for a synchronization of data in an optical WDM transmission system, consisting of the following parts: A wavelength demultiplexer (1) for demultiplexing the incoming data stream in the synchronizer, delay lines (2) for the individual wavelength channels, a multiplexer (10), a modulator (3) modulated by a high frequency clock signal (5) and at least one photodetector (4) tapped to output line (B) where the photodetector (4) is connected to an electronic control circuit (6) which is connected to the findividual delay lines (2) for an automatic delay control.

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patent: 5612807 (1997-03-01), Ishikawa et al.
patent: 5809184 (1998-09-01), Doerr et al.
patent: 6016374 (2000-01-01), Adams et al.
patent: 6137610 (2000-10-01), Patrick
patent: 0936773 (1999-08-01), None
patent: 2706710 (1994-12-01), None
Sangsiri T et al: “Bit Synchronization Using Subcarriers for Control Signaling”, IEEE Photonics Technology Letters, IEEE Inc. May 1999, pp. 602-604, vol. 11, No. 5, New York, US.
Leclerc O et al: “All-Optical Regenerators” May 7-12, 2000; pp. 133-135, vol. 39, 2000, New York, NY: IEEE, US.
O. Leclerc et al., “Simultaneously regenerated 4x40 Gbit/s dense WDM transmission over 10,000 km using a single 40 GHz InP Mach Zehnder Modulator”, vol. 36, No. 18.

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