Clock extracting apparatus

Details Clock extracting apparatus Clock extracting apparatus

2011-04-26

2011-04-26

Vanderpuye, Ken N (Department: 2613)

Optical communications

Transmitter and receiver system

Including synchronization

C398S212000, C398S214000

Reexamination Certificate

active

07933523

ABSTRACT:
A clock extracting apparatus is provided. In the clock apparatus, two frequency components are made to have an equal magnitude by adjusting a temperature and current applied to an FP LD, and a clock signal is extracted by beating the two frequency components having the equal magnitude. The clock extracting apparatus includes: a circulator for changing a direction of an inputted optical signal; an adjuster for adjusting a characteristic and wavelength of a spectrum; and a clock extractor for selecting two frequency components having different magnitudes on the spectrum of the inputted optical signal, receiving an adjusted signals in which magnitudes of the two frequency components are made equal by the adjuster, making the two frequency components have an equal magnitude, and extracting a clock signal by beating the two frequency components having the equal magnitude.

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patent: 08-240826 (1996-09-01), None
patent: 1020030047966 (2003-06-01), None
Masahiko Jinno et al., “Optical Tank Circuits Used for All-Optical Timing Recovery”, Apr. 1992, IEEE Journal of Quantum Electronics, vol. 28, No. 4, pp. 895-900.
Jeong, Yong Deok, et al., “All-Optical NRZ-to-PRZ Converter at 10 Gb/s Based on Self-Phase Modulation of Fabry-Perot Laser Diode”, Apr. 2004, IEEE Photonics Technology Letters, vol. 16, No. 4, pp. 1179-1181.
C. Kim et al., “All-optical clock recovery of NRZ data at 40 Gbit/s using Fabry-Perot filter and two-section gain-coupled DFB laser”, Electronics Letters, Oct. 2, 2003, vol. 39, No. 20.
Yingmin Yang et al., “Optical Clock Recovery at Line Rates via Injection Locking of a Long Cavity Fabry-Perot Laser Diode”, IEEE Photonics Technology Letters, Jun. 2004, vol. 16, No. 6, pp. 1561-1563.
Optical signal processing for very high speed (>40 Gbit/s) ETDM binary NRZ clock recovery, Optical Fiber Commuunication conference, vol. OFC2001, pp. MG1-1-MG1-3, 2001).

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