Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1995-08-07
1997-02-11
Chin, Wellington
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359113, 359179, 372 38, H04B 1000
Patent
active
056026650
ABSTRACT:
During transmitting operation, a voltage responding to transmission data is applied to an absorption type semiconductor optical modulator in such a manner that a semiconductor outputs constant intensity light, and this light is modulated in response to the transmission data during transmitting operation. The intensity-modulation is given by changes of absorption coefficient of the semiconductor optical modulator in response to applied voltage. Then, during receiving operation, the light outputted from the semiconductor laser is interrupted and a predetermined voltage is applied to the absorption type semiconductor optical modulator. Detecting light signals is given by monitoring current changes in response to level of signal light entered from a transmission path. A value of a current flowing through the absorption type semiconductor optical modulator is converted into a voltage signal representative of reception data by a current/voltage converting circuit.
REFERENCES:
patent: 4972514 (1990-11-01), Linke
patent: 5027434 (1991-06-01), Brahms et al.
patent: 5349462 (1994-09-01), Defranco et al.
Chin Wellington
NEC Corporation
Negash Kinfe-Michael
LandOfFree
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