Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1996-07-08
1999-09-21
Negash, Kinfe-Michael
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359113, 359158, H04B 1000
Patent
active
059561696
ABSTRACT:
In bidirectional optical burst transmission using a single optical fiber, a signal is reliably discriminated even if reflected light is contained in a received optical signal. According to a first aspect of the invention, the received signal converted into an electrical signal is compared with a prescribed reference voltage, thereby generating a signal light identification voltage output for identifying the beginning of the signal light. According to a second aspect of the invention, a peak value and a bottom value of the received signal are held with respectively prescribed time constants, and a voltage intermediate between them is generated as a voltage output used to discriminate the signal light. According to a third object of the invention, the waveform only of the reflected light is detected and stored, and a signal light voltage output with the reflected light suppressed is generated by subtracting the stored waveform from the received signal.
REFERENCES:
patent: 5153764 (1992-10-01), Faulkner et al.
patent: 5317441 (1994-05-01), Sidman
patent: 5434668 (1995-07-01), Wootton et al.
Fujitsu Limited
Negash Kinfe-Michael
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