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	Asymmetric edge compensation of both anode and cathode terminals of a vertical-cavity surface-emitting laser (VCSEL) diode
	NG, KWAN TING
	2015-06-09
著作权人	HONG KONG APPLIED SCIENCE AND TECHNOLOGY RESEARCH INSTITUTE CO, LTD.
专利号	US9054485
国家	美国
文献子类	授权发明
其他题名	Asymmetric edge compensation of both anode and cathode terminals of a vertical-cavity surface-emitting laser (VCSEL) diode
英文摘要	A laser driver circuit compensates for non-linear behavior of Vertical-Cavity Surface-Emitting Laser (VCSEL) devices. A VCSEL has an internal parasitic capacitance that is charged while the VCSEL is on. When the VCSEL turns off, this internal parasitic capacitor discharges, keeping the VCSEL on longer, increasing the physical turn-off or fall time. The laser driver circuit compensates for the slower fall time by modulating both anode and cathode terminals of the VCSEL as the VCSEL is turned on and off. Both plates of the internal parasitic capacitor are discharged at turn off, cutting the parasitic discharge time in half. A cathode driver transistor modulates the cathode voltage while a source-follower transistor modulates the anode voltage. A modulating current may be switched using a current mirror structure. Multiple source-follower transistors may be selectable in parallel, with switches to select the total anode current, allowing for programmable compensation of the fall time.
公开日期	2015-06-09
申请日期	2014-09-17
状态	授权
内容类型	专利
源URL	[http://ir.opt.ac.cn/handle/181661/42625]
专题	半导体激光器专利数据库
作者单位	HONG KONG APPLIED SCIENCE AND TECHNOLOGY RESEARCH INSTITUTE CO, LTD.
推荐引用方式 GB/T 7714	NG, KWAN TING. Asymmetric edge compensation of both anode and cathode terminals of a vertical-cavity surface-emitting laser (VCSEL) diode. US9054485. 2015-06-09.

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