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	Driving method for semiconductor laser
	KITAGAWA SHUNJI; HASEGAWA SHINYA; YAMAGISHI FUMIO; IKEDA HIROYUKI; INAGAKI YUSHI
	1987-05-29
著作权人	FUJITSU LTD
专利号	JP1987118590A
国家	日本
文献子类	发明申请
其他题名	Driving method for semiconductor laser
英文摘要	PURPOSE:To prevent fluctuation in temperature and decrease in optical output, by deforming a modulating signal in a rectangular wave into a form, in which a corner at a rising part is removed, so as to obtain a driving signal, applying the signal to a semiconductor laser, and suppressing the temperature increase, when the driving signal is applied, to the utmost. CONSTITUTION:A driving signal (c) in pulse waveform, which undergoes modulation, is applied to a semiconductor laser LD. At the time of rising of the modulating signal (a), an edge signal (b), whose polarity is reverse with respect to the modulating signal, is generated in synchronization with the rising timing of the modulating signal. The edge signal is superimposed on the modulating signal. Then the driving signal has a slowly increasing waveform. The driving signal is applied to the semiconductor laser LD before the rectangular wave reaches a peak. For example, when the modulating signal in rectangular waveform is inputted to a differential circuit 14, a differential waveform is generated and rectified in a rectifier circuit 15. The differential waveform at the falling part is removed. The differential waveform at the rising part becomes the waveform, whose polarity is inverted by an inverter circuit 16. The result is inputted into a superimposing circuit 17. The modulating signal is also inputted to the superimposing circuit 17. The differential waveform, whose polarity is inverted, is superimposed to the modulating signal. The driving signal 12, whose corner at the rising part is removed, is obtained and applied to the semiconductor laser LD.
公开日期	1987-05-29
申请日期	1985-11-18
状态	失效
内容类型	专利
源URL	[http://ir.opt.ac.cn/handle/181661/68822]
专题	半导体激光器专利数据库
作者单位	FUJITSU LTD
推荐引用方式 GB/T 7714	KITAGAWA SHUNJI,HASEGAWA SHINYA,YAMAGISHI FUMIO,et al. Driving method for semiconductor laser. JP1987118590A. 1987-05-29.

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