Circuit for discriminating the presence of extraordinariness in

Details Circuit for discriminating the presence of extraordinariness in Circuit for discriminating the presence of extraordinariness in

1997-01-14

1998-09-08

Negash, Kinfe-Michael

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359177, H04B 1008

Patent

active

058053190

ABSTRACT:
It is the object of the invention to provide an extra ordinariness-discriminating circuit for an optical signal, which discriminates whether an output signal of an optical direct amplifier is a STM one or a signal being other than a STM one, such as ASE noise and etc., and examines the presence of an extraordinary optical signal. A portion of the output signal of the optical direct amplifier is branched by an optical coupler, and converted into an electrical signal by an O/E converter and divided in two. One of divided electrical signals is supplied to a band pass filter, which extracts 8 KHz component to be detected by the first detector, and the other one is directly supplied to the second detector and detected therein. Both the detected voltages are supplied to a comparator. When the output signal of the optical direct amplifier is the STM signal, the difference of the input powers detected by the comparator is smaller than that obtained in a case where the input optical signal is other than the STM signal, and thereby one can detect whether the output optical signal of the optical direct amplifier is the STM signal or not.

REFERENCES:
patent: 5644423 (1997-07-01), Iwano

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