Semiconductor laser device series driven by double variable constant current source

A technology of series drive and constant current source, which is applied in the field of lasers, can solve the problems of expensive semiconductor lasers and damage prices, and achieve the effects of cost reduction, work safety, and high-speed protection circuits

Inactive Publication Date: 2005-03-23
天津市仁和祥科贸有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since even an overcurrent strong pulse with a width of several nanoseconds may damage the expensive semiconductor laser, high-speed protection and suppression circuits are specially designed when making the driving power supply. Accidental damage directly damages the semiconductor laser

Method used

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  • Semiconductor laser device series driven by double variable constant current source
  • Semiconductor laser device series driven by double variable constant current source
  • Semiconductor laser device series driven by double variable constant current source

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Embodiment Construction

[0014] The present invention will be further described below in conjunction with the accompanying drawings and examples.

[0015] figure 1 It is a brief block diagram of the working principle of the present invention, describing the basic working principle.

[0016] figure 2 The double variable constant current source drives the semiconductor laser device in series, including the first transistor T1 and the second transistor T2, the emitter of the first transistor T1 is connected to the power supply, the emitter of the second transistor T2 is connected to the collector of the first transistor T1, and the first constant Both the current source HL1 and the second constant current source HL2 are three-terminal adjustable constant current devices, and the constant current depends on the first resistor W1 + the third resistor W3, the second resistor W2 + the fourth resistor W4, and the first constant current The source HL1 and the second constant current source HL2 amplify the c...

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Abstract

The invention, equipment of double alterable current source driver semiconductor laser, relates to the laser used in communications which is equipment of double alterable current source driver semiconductor laser, relates to the laser in detail. For providing correct current, stable, simple structure and safe equipment of double alterable current source driver semiconductor laser, the technique scheme adapted by the invention is as follows: preliminary audion and secondary audion, the emitter of preliminary audion connects to electrical source, the emitter of secondary audion connects to collector of preliminary audion, the preliminary current source and the secondary current source connects apart to the base electrodes of preliminary audion and secondary audion through adjusting resistance. After being magnified by preliminary audion and secondary audion, the current source is outputted to the groupware of laser. The invention is available to make correct driver electricity source, stable, simple structure and safe equipment of double alterable current source driver semiconductor laser.

Description

technical field [0001] The invention relates to a laser used for communication, in particular to a semiconductor laser device driven in series by double variable constant current sources. Background technique [0002] Semiconductor lasers used in communications are generally driven by an adjustable constant current source made of a single semiconductor transistor. Since even an overcurrent strong pulse with a width of several nanoseconds may damage the expensive semiconductor laser, high-speed protection and suppression circuits are specially designed when making the driving power supply. Accidental damage directly damages the semiconductor laser. Contents of the invention [0003] In order to overcome the deficiencies in the prior art, the purpose of the present invention is to provide accurate and stable driving current, simple structure and safe double variable constant current source series driving semiconductor laser device. The technical solution adopted by the pres...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S5/00H01S5/042
Inventor 倪文俊杨天新姜骁骏
Owner 天津市仁和祥科贸有限公司
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