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	Optical amplifier
	VERBEEK, BASTIAAN HENDRIK; VAN ES-SPIEKMAN, WILMA; HENDRIX, LEONARDUS JOANNES MARIA
	1991-05-08
著作权人	PHILIPS ELECTRONICS N.V.
专利号	EP0426239A1
国家	欧洲专利局
文献子类	发明申请
其他题名	Optical amplifier
英文摘要	An optical amplifier with a semiconductor body comprising a layer structure grown on a substrate 1 with an active layer 4 situated between two cladding layers (2, 3) with a strip-shaped amplification region bounded by two end surfaces (7, 8) which form the input and output surfaces of the radiation to be amplified. The active layer comprises a number of quantum well (QW) layers 4A with direct band transition, which are separated by barrier layers 4B of a different semiconductor material. According to the invention, the material, the number, and the thickness of the QW layers 4A and the barrier layers 4B in combination with the length l of the amplification region are chosen in such a way that two optical transitions can take place in the active layer 4, maximum amplification occurring at a certain current density through the PN junction for the radiation wavelengths corresponding to these optical transitions, while the end surfaces (7, 8) are provided with an anti-reflection layer 9 which has a reflection coefficient R of at most 0,5% for these two wavelengths. An anti-reflection layer made up of four layers of alternately titanium oxide and aluminium oxide is advantageously used.
公开日期	1991-05-08
申请日期	1990-10-24
状态	失效
内容类型	专利
源URL	[http://ir.opt.ac.cn/handle/181661/87073]
专题	半导体激光器专利数据库
作者单位	PHILIPS ELECTRONICS N.V.
推荐引用方式 GB/T 7714	VERBEEK, BASTIAAN HENDRIK,VAN ES-SPIEKMAN, WILMA,HENDRIX, LEONARDUS JOANNES MARIA. Optical amplifier. EP0426239A1. 1991-05-08.

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