Method and system for optical wavelength conversion and...

Optical communications – Optical repeater system – Regenerative

Reexamination Certificate

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C398S175000, C398S183000

Reexamination Certificate

active

07031617

ABSTRACT:
An on/off switchable source of a continuous optical signal at a respective wavelength (λ2) is provided to be turned off when the wavelength (λ1) of the modulated incoming signal corresponds to the respective wavelength (λ2) generated by the source while turning said source on when the wavelength (λ1) of the incoming signal differs from the source wavelength (λ2). A Michelson interferometer is provided adapted to receive the incoming signal and the continuous optical signal generated by the source to produce an output signal. The Michelson interferometer is adapted to give rise to destructive viz. constructive interference when the incoming signal has first and second logical values, respectively. When the wavelength (λ1) of the incoming signal, which is not generally known a priori, corresponds to the source wavelength (λ2), the source is switched off and the output signal is a replica of the incoming signal regenerated at the interferometer. When the wavelength (λ1) of the incoming signal differs from the source wavelength (λ2), the source is switched on and the output signal is a replica of the incoming signal regenerated at the interferometer and wavelength converted to the source wavelength (λ2).

REFERENCES:
patent: 08334797 (1996-12-01), None
Kieman, L. European Search Report, Application No. EP 01 11 6986, dated Dec. 7, 2001.
Wolfson D. et al. “40-GB/S All-Optical Wavelength Conversion, Regeneration, and Demultiplexing in an SOA-Based All-Active Mach-Zehnder Interferometer,” IEEE Photonics Technology Letters, New York, vol. 12, No. 3, Mar. 2000, pp. 332-334, XP000931980.
Wolson D. et al.“All-Optical 2R Regeneration Based on Interferometric Structure Incorporating Semiconductor Optical Amplifiers,” Electronic Letters, vol. 35, No. 1, Jan. 7, 1999, pp. 59-60, XPP000876265.
Durhuus T. et al. “All Optical Wavelength Conversion by SOA's in a Mach-Zehnder Configuration,” IEEE Photonics Technology Letters, vol. 6, No. 1, 1994, pp. 53-55, XP000540019.
Jepsen K S et al. “20 GBIT/S Optical 3R Regeneration Using Polarisation-Independent Monolithically Integrated Michelson Interferometer,” Electronics Letters, vol. 34, No. 5, Mar. 5, 1998, pp. 472-474, XP006009368.

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