Semiconductor laser transmitting circuit

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	Semiconductor laser transmitting circuit
其他题名	Semiconductor laser transmitting circuit
	MOTEGI MITSUHIRO; TAKAHASHI MASAAKI
	1983-12-27
专利权人	FUJITSU KK
公开日期	1983-12-27
授权国家	日本
专利类型	发明申请
摘要	PURPOSE:To eliminate the need for a beam splitter and to reduce loss to a main light signal, by using a polarized component which is not used for communication as a loop-back light signal in a duplicated semiconductor laser transmitting circuit. CONSTITUTION:The TM polarized component of a laser diode LD21 is polarized at right angled by a polarizer 25 and coupled with an optical fiber 15, and the TM polarized component of an LD22 enters and advances straight in the polarizer 25 and is coupled with the optical fiber 15 through the same route with the TM polarized component of the LD2 Therefore, the TM polarized components are transmitted to the optical fiber 15 through the polarizer 25 regardless of which of the LDs 21 and 22 is in use. A control circuit 13 detects a fault search signal during fault searching operation and then opens an optical switch 14. The TM polarized component transmitted through the optical fiber 15 is converted by a photodetecting element 10 into an electric signal, which is recovered into the light signal through a 3R circuit 11 and a light emitting element 12; and the light signal is returned to the terminal station through the optical fiber 5, thus sending the main signal back. Therefore, a beam splitter, etc., for extracting a loop-back signal are excluded from the main signal path and loss to the main signal is reduced.
其他摘要	目的：通过在复制的半导体激光发射电路中使用不用于通信的偏振分量作为环回光信号，消除对分束器的需要并减少对主光信号的损失。组成：激光二极管LD21的TM偏振分量由偏振器25直角偏振并与光纤15耦合，LD22的TM偏振分量在偏振器25中进入并直线前进并与光学器件耦合光纤15通过与LD21的TM偏振分量相同的路径。因此，无论LD 21和22中的哪一个在使用中，TM偏振分量都通过偏振器25传输到光纤15。控制电路13在故障搜索操作期间检测故障搜索信号，然后打开光开关14.通过光纤15传输的TM偏振分量被光电检测元件10转换成电信号，该信号被恢复为光信号。通过3R电路11和发光元件12;光信号通过光纤5返回终端，从而发回主信号。因此，用于提取环回信号的分束器等被排除在主信号路径之外，并且减少了对主信号的损失。
主权项	-
申请日期	1982-06-24
专利号	JP1983225744A
专利状态	失效
申请号	JP1982108763
公开（公告）号	JP1983225744A
IPC 分类号	H04B3/36 \| H01S5/00 \| H04B10/032 \| H04B10/035 \| H04B10/077 \| H04B10/29 \| H04B10/293 \| H04B10/564 \| H04B10/572 \| H01S3/18 \| H04B3/38 \| H04B9/00
专利代理人	-
代理机构	-
文献类型	专利
条目标识符	http://ir.opt.ac.cn/handle/181661/62860
专题	半导体激光器专利数据库
作者单位	FUJITSU KK
推荐引用方式 GB/T 7714	MOTEGI MITSUHIRO,TAKAHASHI MASAAKI. Semiconductor laser transmitting circuit. JP1983225744A[P]. 1983-12-27.

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