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Low-voltage self-adaptive optical communication laser driver circuit

A technology of laser driver and current driver, which is applied in the direction of lasers, laser components, semiconductor lasers, etc., can solve the problems of laser drivers not working properly, and achieve the effect of reducing overall power consumption and improving working speed

Inactive Publication Date: 2011-05-18
FENGHUO COMM SCI & TECH CO LTD +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0006] In view of the defects existing in the prior art, the object of the present invention is to provide a low-voltage adaptive optical communication laser driver circuit to solve the problem that the laser driver cannot work normally when the power supply voltage is low

Method used

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  • Low-voltage self-adaptive optical communication laser driver circuit
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  • Low-voltage self-adaptive optical communication laser driver circuit

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Embodiment Construction

[0036] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0037] The invention provides a low-voltage self-adaptive optical communication laser driver modulation current output circuit, which can be used for high-speed modulation current output under low power supply voltage working conditions to drive optical communication lasers / laser diodes. figure 2 It is a system block diagram of the present invention, which includes:

[0038] A differential modulation current amplifier A1, used to amplify the input modulation current signal Din, and match the impedance and level of the subsequent stage (differential voltage follower A2);

[0039] A differential voltage follower A2, as the post-stage of the differential modulation current amplifier A1, is used to amplify the input modulation current signal processed by the differential modulation current amplifier A1, and is equivalent to the impedance and level of the post-st...

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Abstract

The invention relates to a low-voltage self-adaptive optical communication laser driver circuit which comprises a differential modulating current amplifier A1, a differential voltage follower A2 and a differential modulating current driver A3 connected in sequence, wherein the differential modulated current amplifier A1 is used for amplifying an input modulating current signal Din and is matched with the impedance and the level of the later stage; the differential voltage follower A2 is used for amplifying the input modulating current signal processed by the differential modulating current amplifier A1 and is matched with the impedance and the level of the later stage; the differential modulating current driver A3 is used for outputting a modulating current signal Dout, and the modulating current signal Dout is used for driving a laser diode; and a modulating current control circuit is used for adjusting the modulating current of the differential modulating current amplifier A1. The laser driver circuit provided by the invention can work under the condition of very low power supply voltage; the working speed of the driver circuit is increased; and the magnitude of the driver stage drive current can be autonomously adjusted.

Description

technical field [0001] The invention relates to a laser modulation current output driving circuit in the field of laser communication, in particular to a low-voltage self-adaptive optical communication laser driver circuit. Background technique [0002] As an indispensable part of optical communication system, laser driver is widely used in various aspects such as synchronous digital multiplexing, high-speed Ethernet, fiber-to-the-home, etc., and has become the research field of many scholars at home and abroad. [0003] Optical communication systems have many requirements for laser drivers, mainly including input signal amplitude, output rise / fall time, laser power control, bias current and modulation current control, temperature compensation, failure monitoring and other aspects. [0004] The typical modulation current driving circuit of the existing laser driver used for optical communication is as follows: figure 1 shown. Transistors Q5 and Q6 form the first-stage limi...

Claims

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Application Information

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IPC IPC(8): H01S5/042H03F3/45
Inventor 蒋湘周华
Owner FENGHUO COMM SCI & TECH CO LTD
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