Optical timing extraction circuit

Details Optical timing extraction circuit Optical timing extraction circuit

1992-07-29

1994-08-16

Olms, Douglas W.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359182, 359189, 359195, 341 68, H04J 1400

Patent

active

053391853

ABSTRACT:
An optical timing extraction circuit is capable of extracting an optical clock signal of greater than tens of Gb/sec from a NRZ modulated signal. The light intensity level of a light signal modulated in intensity by an NRZ signal is amplified to a level sufficient to cause the optical Kerr effect, and combined with a CW light from a semiconductor laser which is modulated in frequency by the amplified light signal in an optical converting circuit by utilizing the optical Kerr effect. This frequency-modulated light is passed through a narrow band-pass optical filter to cause a signal intensity-modulated pulsed light at each intensity changing point of the modulated signal. Next, after the pulsed light is amplified up to a required optical intensity level, it is passed through another narrow band-pass optical filter, which is an optical tank for extracting the optical clock, to extract an optical clock signal.

REFERENCES:
patent: 4991975 (1991-02-01), Alferness et al.
Jinno et al., "All-optical Timing Extraction Circuit", Material of Institute of Electronics, Information and Communication Engineers, Optical Communication System Seminar, Dec. 1988, pp. 68-74.

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