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	Improvements in or relating to methods and apparatus for modulating a semiconductor laser
	THOMAS, LEE, PAOLI; JOSE, ELLIS, RIPPER
	1972-12-13
著作权人	WESTERN ELECTRIC COMPANY INCORPORATED
专利号	GB1299847A
国家	英国
文献子类	授权发明
其他题名	Improvements in or relating to methods and apparatus for modulating a semiconductor laser
英文摘要	1299847 Lasers WESTERN ELECTRIC CO Inc 25 Nov 1970 [1 Dec 1969] 56022/70 Heading H1C A semi-conductor laser is continuously pumped at a temperature chosen such that selfinduced pulses occur in its output, and the pumping energy is amplitude modulated to give pulse position modulation. The frequency and depth of modulation are chosen to avoid phase locking the laser output pulses to the modulating signal, the choice being made empirically, i.e. by measuring the modulation power required to phase lock the output and subsequently maintaining the power below this level. The selfinduced pulses occur in the microwave region with pumping energies of 1À1-3 times the laser threshold; temperature ranges of 77-110 K. are quoted for a GaAs injection diode laser. The pulses apparently occur because of dispersion in the semi-conductor and locking between longitudinal modes. The device is located in a microwave transmission line for coupling to a modulating source, so that the incident modulating microwaves alter the pumping current. The modulation power is around 1 mw. The variation of the output pulse position with the modulating signal may be adjusted by choice of the size of the diode heat sink. The modulating signal may also be used to vary the pumping energy of semi-conductor lasers which are pumped optionally or by an electron beam. Feedback may be applied to stabilize the pulse width, the feedback being electrical, optical or electro-optical as in Specification 1,266,086. Several lasers may be used in a multiplex communication system, and the lasers may have differing output frequencies as in Specification 1,266,084.
公开日期	1972-12-13
申请日期	1970-11-25
状态	失效
内容类型	专利
源URL	[http://ir.opt.ac.cn/handle/181661/34669]
专题	半导体激光器专利数据库
作者单位	WESTERN ELECTRIC COMPANY INCORPORATED
推荐引用方式 GB/T 7714	THOMAS, LEE, PAOLI,JOSE, ELLIS, RIPPER. Improvements in or relating to methods and apparatus for modulating a semiconductor laser. GB1299847A. 1972-12-13.

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