Optical: systems and elements – Optical amplifier – Optical fiber
Patent
1995-02-22
1996-10-08
Moskowitz, Nelson
Optical: systems and elements
Optical amplifier
Optical fiber
359177, H01S 310, H04J 1400, G02F 135
Patent
active
055637310
ABSTRACT:
A monitor control signal receiving apparatus for an optical fiber amplifier includes a laser diode, an optical coupler, a rare-earth-element-doped optical fiber, a pin photodiode, a controller, and a monitor signal extractor. The laser diode generates pump light. The optical coupler optically wavelength-multiplexes an input optical signal and the pump light from the laser diode. The rare-earth-element-doped optical fiber receives the optical signal and pump light from the optical coupler. The pin photodiode converts part of an optically amplified optical signal from the rare-earth-element-doped optical fiber into an electrical signal. The controller compares the electrical signal from the photoelectric converter with a reference voltage to control the laser diode such that an output level of the optical signal from the optical fiber is kept constant. The monitor signal extractor extracts a monitor control signal from an output from the controller.
REFERENCES:
patent: 4995100 (1991-02-01), Stallard et al.
patent: 5054876 (1991-10-01), Grasso et al.
patent: 5138621 (1992-08-01), Goto et al.
patent: 5355250 (1994-10-01), Grasso et al.
Moskowitz Nelson
NEC Corporation
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