Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1996-12-27
1998-06-16
Pascal, Leslie
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359179, 359124, 359133, 359161, H04B 1017, H04J 1402
Patent
active
057680000
ABSTRACT:
In a wavelength multiplexing optical transmission device, first and second optical transmission boards output optical signals which have wavelengths different from each other and on which different sine-wave signals are superposed. The optical signals are coupled by an optical coupler, then divided into two lights by an optical divider. One optical signal is amplified by an optical amplifier. the other optical signal is converted into an electrical signal by a photodiode. The sine-wave signal components are extracted by first and second bandpass filters with the existence of the extracted signals being detected by output detectors. An adder output a reference voltage signal with a voltage according to the number of signals detected. A gain control circuit controls the amplification gain based on a voltage value corresponding to the intensity of an optical signal to be output and the reference voltage value, so that the level of output light can be controlled according to the number of optical signals.
REFERENCES:
patent: 5396360 (1995-03-01), Majima
patent: 5463487 (1995-10-01), Epworth
patent: 5644423 (1997-07-01), Iwano
NEC Corporation
Pascal Leslie
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