Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1991-02-14
1992-11-10
Coles, Sr., Edward L.
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
370 131, 375 3, 340425, H04B 1002
Patent
active
051629364
ABSTRACT:
Apparatus for monitoring a plurality of optical repeaters of an optical communication system in which each said repeater directly amplifies an optical signal transmitted in an optical fiber and passing through the respective optical repeater, including an optical division circuit for dividing an outgoing main line signal and a monitoring signal, a format conversion circuit by which monitoring information is converted into binary information, a previous modulation circuit by which a monitoring signal is modulated with a sine wave, a comparison circuit which compares the monitoring signal with a reference voltage, a voltage controlled amplifier which amplifies the modulated monitoring signal, an automatic gain control circuit which regulates the output from the outgoing optical repeater, and an outgoing optical repeater which includes a stimulating light source, a wave synthesizer and a doped optical fiber.
REFERENCES:
patent: 4843382 (1989-06-01), Oda et al.
patent: 4971417 (1990-11-01), Krinsky et al.
Edagawa Noboru
Taga Hidenori
Wakabayashi Hiroharu
Yamamoto Shu
Coles Sr. Edward L.
Kokusai Denshin Denwa Company, Ltd.
Negash Kinfe-Michael
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