Phase lock loop circuit using optical correlation detection

Details Phase lock loop circuit using optical correlation detection Phase lock loop circuit using optical correlation detection

1996-06-05

1998-01-06

Negash, Kinfe-Michael

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359110, 359135, 375294, H04B 1000

Patent

active

057061130

ABSTRACT:
It is an object of the present invention to provide an optical clock phase lock loop capable of a higher operational speed than the conventional technology by utilizing high-speed optical phenomena other than gain modulation. In an optical clock phase lock loop for conducting locking control by means of obtaining the correlation of an optical signal and optical clock, after combining an optical clock of a short pulse containing a harmonics component with an optical signal by means of an optical coupler 102, and providing the resultant light to traveling-wave semiconductor laser amplifier 103, the correlation signal of the optical signal and optical clock included in the output signal of this traveling-wave semiconductor laser amplifier 103 is detected by means of optical bandpass filter 104.

REFERENCES:
patent: 5457559 (1995-10-01), Saito et al.
S. Kawanishi et al., 100 Gbit/s, 50km, and Nonrepeated Optical Transmission Employing All-Optical Multi-Demultiplexing and PLL Timing Extraction, Electronics Letters, vol. 29, No. 12, pp. 1075-1076, Jun. 10, 1993.
S. Kawanishi et al., Ultra-High-Speed PLL-Type Clock Recovery Circuit Based on All-Optical Gain Modulation in Traveling-Wave Laser Diode Amplifier, Journal of Lightwave Technology, vol. 11, No. 12, pp. 2123-2129, Dec. 1993.
H. Takara et al., Ultra High-Speed Optical Waveform Measurement Method Using Optical Sampling with Sum-Frequency Generation, B-I, vol. J75-B-I No. 5, pp. 372-380, May 1992.

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