Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1997-01-22
1998-09-01
Negash, Kinfe-Michael
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359158, 359161, 359173, 359176, H04J 1402, H04B 1000
Patent
active
058018620
ABSTRACT:
The object of the invention enables wavelength division multiplexed solitons conveyed by an optical fiber to be regenerated synchronously. The method uses clock recovery from the WDM signal, and synchronous modulation of the solitons at the clock rate recovered in this way. The locations for the optical modulators are selected to be at a distance between the transmitter and the first modulator or between successive modulators along the optical link such that the signals at different wavelengths are synchronous. The apparatus of the invention regenerates solitons in-line by synchronously modulating said solitons using an optical modulator, clock recovery, and multichannel filtering at the output from the modulator. In a particular embodiment, the telecommunications system of the invention also includes fiber lengths having different dispersion relationships depending on their position within the link, so as to achieve "dispersion management" within the link. The invention is applicable to optical telecommunications over great distances by means of solitons.
REFERENCES:
patent: 5369520 (1994-11-01), Avramopoulos et al.
patent: 5642215 (1997-06-01), Suzuki et al.
M. Nakazawa, Experimental Demonstration of Soliton Data Transmission Over Unlimited Distances with Soliton Control in Time and Frequency Domains, Electronics Letters, vol. 29, No. 9, 29 Apr. '93, pp. 729-730.
M. Jinno et al, "All-Optical Regenerator Based on NonLinear Fibre Sagnac Interferometer", Electronics Letters, vol. 28, No. 14, 2 Jul. 1992, pp. 1350-1352.
M. Nakazawa et al, 806GBit/s Soliton Data Transmission Over 500KM with Unequal Amplitude Solitons for Timing Clock Extraction.
Iwatsuki et al., "40 Git/s Optical Soliton Transmission Over 65 km", Electronics Letters, vol. 28, No. 19, Sep. 10, 1992. pp. 1821-1822.
Chesnoy Jose
Desurvire Emmanuel
Leclerc Olivier
Alcatel Submarine Networks
Negash Kinfe-Michael
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