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	Modulating system of semiconductor laser
	KAMISAKA KOUJI
	1984-01-25
著作权人	NIPPON VICTOR KK
专利号	JP1984014143A
国家	日本
文献子类	发明申请
其他题名	Modulating system of semiconductor laser
英文摘要	PURPOSE:To obtain an output applied with optical modulation with a fixed amplitude at all times, by detecting both maximum and minimum levels of a laser light output to be optically modulated and then controlling the working point and amplitude of the modulated signal based on the detected signal. CONSTITUTION:In the case of an ambient temperature TO in a steady mode, an input video signal ein undergoes modulation of amplitude by a modulated signal aO given from a comparator 3 through a modulating circuit 2. Thus the signal ein is turned into a driving current to be modulated and supplied to a semiconductor laser oscillator 4. For the output signal of a monitor diode 5, the mean value PO of an output PTO to be optically modulated is clamped 6. Then the output signal of the diode 5 is supplied to detecting circuits 7 and 8 respectively. At the same time, the circuits 7 and 8 detect the maximum value EA and the minimum value EB with a clamping pulse generated 9 based on a modulated output. Each detected value is converted into a control signal by the comparator 3 and then supplied to a modulating circuit 2 in the form of a driving current. As a result, an optical output PT1 of the oscillator 4 is set equal to the maximum and minimum levels of the output PTO applied with optical modulation which are obtained in a steady mode.
公开日期	1984-01-25
申请日期	1982-07-13
状态	失效
内容类型	专利
源URL	[http://ir.opt.ac.cn/handle/181661/59305]
专题	半导体激光器专利数据库
作者单位	NIPPON VICTOR KK
推荐引用方式 GB/T 7714	KAMISAKA KOUJI. Modulating system of semiconductor laser. JP1984014143A. 1984-01-25.

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