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	Coupling distribution feedback type semiconductor laser
	SUGIMURA AKIRA; KIMURA TATSUYA
	1989-09-14
著作权人	日本電信電話株式会社
专利号	JP1989231390A
国家	日本
文献子类	发明申请
其他题名	Coupling distribution feedback type semiconductor laser
英文摘要	PURPOSE:To provide a semiconductor laser for optical FM which operates stably by dividing DFB laser to four parts, by coupling each part through lambda/4 phase shift, and by applying thereto uniform bias current and fixed modulation current whose sign is reverse in quadrupole. CONSTITUTION:DFB lasers 101-104 are adhered closely each other and modulation of active layer width to provide each distribution feedback is composed so that its phase deviates by 1/2 wavelength. A fixed current not less than the threshold is made flow to each of electrodes 5, 6 for laser oscillation and dissimilar modulation current is further applied to each of the electrodes 5, 6. The carrier density of the first active layer 1 of each of DFB lasers 101-104 thereby changes. Optical wave between regions of DFB lasers 101-104 receives lambda/4 phase shift. When injected current changes, the amplitude of input/output light and optical frequency also generally change. Current modulation which has reverse sign and equal amplitude are applied to the first - fourth DFB lasers 101-104, that is, I, IV regions and II, III regions of I-IV regions.
公开日期	1989-09-14
申请日期	1988-03-11
状态	失效
内容类型	专利
源URL	[http://ir.opt.ac.cn/handle/181661/63144]
专题	半导体激光器专利数据库
作者单位	日本電信電話株式会社
推荐引用方式 GB/T 7714	SUGIMURA AKIRA,KIMURA TATSUYA. Coupling distribution feedback type semiconductor laser. JP1989231390A. 1989-09-14.

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