Regenerator for a wavelength division multiplex transmission...

Details Regenerator for a wavelength division multiplex transmission... Regenerator for a wavelength division multiplex transmission...

2005-08-16

2005-08-16

Chan, Jason (Department: 2633)

Optical communications

Optical repeater system

Regenerative

C398S079000, C398S093000, C398S155000

Reexamination Certificate

active

06931213

ABSTRACT:
The invention relates to wavelength division multiplex fiber optic transmission systems. It proposes a regenerator including a demultiplexer for separating the signals of various channels, a plurality of optical modulators each receiving signals from the demultiplexer and a modulation clock from a clock distribution unit, and a multiplexer combining the signals modulated by the modulators. The clock distribution unit includes a reference clock and, for each modulator, means for synchronizing the phase of a copy of the reference clock with the signals applied to the modulator. A phase-locked loop can be used for phase synchronization, with a phase shifter controlled in accordance with the average power of the signals at the output of the modulator. The invention enables only low-frequency components to be used to generate modulation clocks from a single reference clock.

REFERENCES:
patent: 5864414 (1999-01-01), Barnsley et al.
patent: 5938309 (1999-08-01), Taylor
patent: 6078601 (2000-06-01), Smith
patent: 6323979 (2001-11-01), Bigo
patent: 6337755 (2002-01-01), Cao
patent: 6347128 (2002-02-01), Ransijn
Leclerc, O, et al.: “Dense WDM (0.27 bit/s/Hz) 4*40 Gbit/s dispersion-managed transmission over 10000 km with in-line optical regeneration by channel pairs” Electronics Letters, Feb. 17, 2000, IEE, UK, vol. 36, No. 4, pp. 337-338, XP002151979.

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