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	KIMURA TATSUYA; SUGIMURA AKIRA
	1993-02-25
著作权人	NIPPON TELEGRAPH & TELEPHONE
专利号	JP1993014436B2
国家	日本
文献子类	授权发明
其他题名	-
英文摘要	PURPOSE:To make a mode of delta=0 exist as the lowest degree mode and make the mode distribution flat by a method wherein a center phase shift is specified, phase shifts on both sides are specified and lengths of the respective four portions divided by the phase shifts at the above three positions are specified in order from the end part. CONSTITUTION:An active layer 2 made of, for instance, InGaAs, GaAs or the like is provided between a cladding layer 1 and a cladding layer 3 made of, for instance, InP, AlGaAs or the like. Three light phase shifted parts whose phase shifts are phi1=lambda(1+q)/4, phi2=lambda/4 and phi3=lambda(1-q)/4 are provided. A coupling distribution feedback structure is constituted in such a manner that the length of four portions divided by the three parts are L(1+d)/4, L(1-d)/4, L(1-d)/4 and L(1+d)/4. When a laser which has the flat mode distribution and is stable for the application to a long resonator is realized by utilizing such coupling distribution feedback structure, a symmetrical structure is employed, so that the advantage that oscillation of a mode of delta=0 can be provided is achieved.
公开日期	1993-02-25
申请日期	1988-08-10
状态	失效
内容类型	专利
源URL	[http://ir.opt.ac.cn/handle/181661/75555]
专题	半导体激光器专利数据库
作者单位	NIPPON TELEGRAPH & TELEPHONE
推荐引用方式 GB/T 7714	KIMURA TATSUYA,SUGIMURA AKIRA. -. JP1993014436B2. 1993-02-25.

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