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	Power controller for semiconductor laser
	YOKOYAMA NAOKI
	1989-04-17
著作权人	HITACHI LTD
专利号	JP1989097974A
国家	日本
文献子类	发明申请
其他题名	Power controller for semiconductor laser
英文摘要	PURPOSE:To improve the precision of convergence by providing a bias setting circuit, a digital-analog converter (DAC) reference current setting circuit, a threshold current (Ith) comparator, and software which realizes an algorithm to unify and automatically set them. CONSTITUTION:The bias current of a bias setting circuit 22 is raised until the output signal of an Ith detecting circuit 14 is changed, and the set current is fixed, and thereby, Po/If (Po is laser power and If is a laser driving current) is apparently fixed with respect to the characteristic curve of a laser. Preliminarily determined DAC reference current values and power reference data are unequivocally outputted, and an up/down counter is counted up until the output of a comparator 14 which compares the output of a photodetector 32 and power reference data with each other is changed, and the counted value is compared with a preliminarily stored value, and the DAC reference current is set again in accordance with the comparison result, thereby fixing Po/If to a prescribed value. Thus, the convergence precision is improved with respect to power adjustment of the laser.
公开日期	1989-04-17
申请日期	1987-10-09
状态	失效
内容类型	专利
源URL	[http://ir.opt.ac.cn/handle/181661/59535]
专题	半导体激光器专利数据库
作者单位	HITACHI LTD
推荐引用方式 GB/T 7714	YOKOYAMA NAOKI. Power controller for semiconductor laser. JP1989097974A. 1989-04-17.

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