Loss-of-signal detecting device

专利名称：Loss-of-signal detecting device发明人：Yoshihiro Onoda,Takashi Sekiguchi,Takao

Sumiya,Yoshihiro Kaneda

申请号：US11889051申请日：20070808

公开号：US20070280684A1公开日：20071206

专利附图：

摘要：The invention relates to an optical transmitting device. Particularly, the

invention provides a loss-of-signal detecting device that detects a loss of an optical signalreceived by a terminal station or a relay station, in the order of an SD and an SF. The loss-

of-signal detecting device includes: an optical input unit that outputs received-optical-power reduction information and a LOS alarm based on a measuring of received opticalpower of an optical input signal; a synchronizing unit that extracts a synchronous clockcontained in the optical input signal, and outputs an LOL alarm when the clock isasynchronous; and a loss-of-signal detecting unit that determines the presence orabsence of the received-optical-power reduction information, sets the LOS alarm validbased on the output of the LOL alarm when the received-optical-power reductioninformation is present, and immediately sets the LOS alarm valid when the received-optical-power reduction information is absent, thereby detecting a loss of signal basedon a valid LOS alarm.

申请人：Yoshihiro Onoda,Takashi Sekiguchi,Takao Sumiya,Yoshihiro Kaneda

地址：Kawasaki JP,Kawasaki JP,Kawasaki JP,Kawasaki JP

国籍：JP,JP,JP,JP

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