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	Reducing output noise in a ballast-powered semiconductor optical amplifier
	ISLAM, SAIF M.; WANG, SHIH-YUAN
	2004-03-30
著作权人	GAZILLION BITS, INC.
专利号	US6714344
国家	美国
文献子类	授权发明
其他题名	Reducing output noise in a ballast-powered semiconductor optical amplifier
英文摘要	A ballast-powered semiconductor optical amplifier (SOA) apparatus and related methods are described. The SOA comprises a signal waveguide for guiding an optical signal along a signal path, and further comprises one or more ballast lasers positioned with respect to the signal waveguide such that the optical signal is amplified using energy from the lasing fields of the one or more ballast lasers. The problem of relative intensity noise (RIN) transfer from the ballast lasers into the optical signal is avoided by ensuring that the relaxation oscillation frequency (ROF) of each ballast laser is sufficiently higher than the signal modulation rate such that the RIN spectrum is tolerably low at the signal modulation rate. The ROFs themselves are manipulated by methods including adjustment of excitation current densities within the ballast lasers. In multiple-ballast laser embodiments, improvements in amplified spontaneous noise (ASE) performance are achieved where the optical signal gain per unit distance is higher near the SOA input and lower near the SOA output. Embodiments are also described in which multi-segment ballast lasers are used and in which operating points are found that satisfy the RIN noise, ASE noise, and output saturation power criteria.
公开日期	2004-03-30
申请日期	2002-03-15
状态	失效
内容类型	专利
源URL	[http://ir.opt.ac.cn/handle/181661/47499]
专题	半导体激光器专利数据库
作者单位	GAZILLION BITS, INC.
推荐引用方式 GB/T 7714	ISLAM, SAIF M.,WANG, SHIH-YUAN. Reducing output noise in a ballast-powered semiconductor optical amplifier. US6714344. 2004-03-30.

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