发明名称 |
Optical transmitter and optical transmitting apparatus using the same |
摘要 |
An optical transmitter for use in an optical transmitting system based on PDS (Passive Double Star) technology, does not erroneously output an optical signal when the optical transmitter is powered on/off. The optical transmitter has a current source 1 for outputting a drive current having a magnitude corresponding to an input control signal, a Laser diode (LD) for generating an optical output signal based on the received drive current, a modulator 9 for controlling the supply and cutoff of the drive current to the Laser diode (LD), a source voltage detector 3 for monitoring a source voltage to detect whether the source voltage is lower than a predetermined voltage, and a switch circuit 4 for outputting a control signal to the current source 1 to stop the supply of the drive current when the source voltage is determined to be lower than the predetermined voltage. <IMAGE> |
申请公布号 |
EP0938196(A3) |
申请公布日期 |
2003.10.08 |
申请号 |
EP19990102730 |
申请日期 |
1999.02.19 |
申请人 |
HITACHI, LTD.;HITACHI COMMUNICATION SYSTEMS, INC. |
发明人 |
SHIGERU, TOKITA;ATSUSHI, HASEGAWA;HAMAGISHI, TAKAHIRO |
分类号 |
H04B10/27;H04B10/07;H04B10/2507;H04B10/272;H04B10/293;H04B10/54;H04B10/564;H04B10/572 |
主分类号 |
H04B10/27 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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