Method and Apparatus for Extracting Clock Signal From Optical Signal
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United States of America Patent
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Issued Date -
May 21, 2009
app pub date -
Feb 10, 2006
filing date -
Jul 1, 2005
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A clock extraction apparatus capable of supporting even a high-speed optical signal with a simple arrangement is proposed. A π-phase shifted fiber Bragg grating (π-phase shifted FBG) 10 is adjusted in such a manner that a phase difference between reflected light waves resulting from two sub-FBGs 1 and 2 will be π and time delay Δt between the reflected light waves will be smaller than the bit period Tb of an optical signal. An optical signal is input to the π-phase shifted FBG. Pulses are produced in a reflected light wave that is output from the π-phase shifted FBG 10, the pulses appearing at rising and falling edges of an NRZ signal. The reflected light wave is passed through a light circulator 11 and is converted to an electrical signal by a photosensor 12. A clock signal is generated (produced) by passing the electrical signal into a narrow-band filter 13. Using a low-reflectivity Bragg grating-loaded π-phase shifted Bragg grating having four sub-FBGs 1 to 4 improves resistance to wavelength drift in clock signal extraction.
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