Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1990-03-15
1991-02-26
Healy, Brian
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
350 9618, 350 9621, 350416, 455601, 455602, 455610, 455612, G02B 636, G02F 100
Patent
active
049956965
ABSTRACT:
A fiber input/output type semiconductor optical amplifier module is disclosed. The optical amplifier module of the present invention, a semiconductor laser amplifier chip is provided for direct amplification of signal light beam. An optical coupling between the semiconductor laser chip and an input/output fibers is taken with a remote coupling using a parallel light beam. Collimator lenses are provided for converting the lightwave signal into a parallel light beam. Two optical isolators are provided for preventing a self-lasing of the semiconductor laser chip. One of the isolators is inserted on an input side of the semiconductor laser chip, and the other is inserted on an output side of the chip. An interference filter and a beam splitter are disposed in the output side of the semiconductor laser chip. The beam splitter splits the output signal of the semiconductor laser chip for monitoring an output power of the chip.
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Nishimura Eiichi
Tamura Yasuaki
Healy Brian
OKI Electric Industry Co., Ltd.
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