Optical device for the recovery of the timing of a coded signal

Optical: systems and elements – Deflection using a moving element – Using a periodically moving element

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359140, 359181, H04B 1000

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active

054346924

ABSTRACT:
An optical device for recovering the timing of a signal (Si) coded by a digital code, such as the NRZ, CMI, biphase or similar code, is provided. The device has a circuit for shaping and transforming the coded signal into the form of a series of pulses of duration equal to T/2 and occurrence equal to N.times.T, and a timing recovery circuit for determining the timing signal. The present invention has particular utility in the area of digital transmission by optical fibers, although other utilities are also contemplated.

REFERENCES:
patent: 5339185 (1994-08-01), Kaede
"A Dual-Drive Ti:LiNbO3 Mach-Zehnder Modulator Used As An Optoelectric . . . ", IEEE Photonics Tech. Letters, vol. 4., No. 6, Jun. 1992, New York, pp. 592-593, Hansen et al.
"Wavelength Conversion for FM Light . . . ", Electronic Letters, vol. 25, No. 20, Sep. 1989, K. Inoue et al, pp. 1361-1362.
Chahat et al. "Optical Clock Recovery Demonstration Using Periodic Oscillations of a Hybrid Electrooptic Bistable System", IEEE Photonics Technology Letters, vol. 3, No. 1, Jan. 1991, pp. 65-67.

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