专利名称：Optical transmitting/receiving apparatus for
bidirectional communication systems
发明人：Katsuhiro Asako申请号：US08/511803申请日：19950807公开号：US05602665A公开日：19970211
摘要：During transmitting operation, a voltage responding to transmission data isapplied to an absorption type semiconductor optical modulator in such a manner that asemiconductor outputs constant intensity light, and this light is modulated in response tothe transmission data during transmitting operation. The intensity-modulation is given bychanges of absorption coefficient of the semiconductor optical modulator in response toapplied voltage. Then, during receiving operation, the light outputted from thesemiconductor laser is interrupted and a predetermined voltage is applied to theabsorption type semiconductor optical modulator. Detecting light signals is given bymonitoring current changes in response to level of signal light entered from atransmission path. A value of a current flowing through the absorption type
semiconductor optical modulator is converted into a voltage signal representative ofreception data by a current/voltage converting circuit.
申请人：NEC CORPORATION
代理机构：Young & Thompson
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