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Laser driving circuit stabilizing extinction ratio

A technology for driving circuits and lasers, used in lasers, laser parts, semiconductor lasers, etc., can solve problems such as improving the misjudgment rate of symbols, and achieve the effects of simple circuits, strong practicability, and reliable constraints

Active Publication Date: 2012-05-23
XIAMEN UX HIGH SPEED IC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the power of the laser is directly changed, the extinction ratio of the laser will often change, which will inevitably increase the misjudgment rate of the symbol

Method used

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  • Laser driving circuit stabilizing extinction ratio
  • Laser driving circuit stabilizing extinction ratio
  • Laser driving circuit stabilizing extinction ratio

Examples

Experimental program
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Effect test

Embodiment 1

[0032] figure 1 It is a schematic diagram of the first embodiment of the present invention; the power adjustment module 10 is connected in series between the cathode of the laser LD and the ground, and then connected to the anode of the backlight diode PD through a voltage sampling terminal 12, and connected to a reference voltage module through a reference voltage terminal 11 40. The voltage value of the voltage sampling terminal 12 is proportional to the photocurrent of the backlight diode PD.

[0033] A differential drive module 20, the first and second differential drive terminals 21, 22 are respectively connected to the positive and negative electrodes of the laser LD; the differential drive module 20 has a common mode current terminal 23 to the ground, and a reference current to the ground Determined by the reference current module 30.

[0034] In actual work, the reference voltage module 40 outputs a reference voltage Vref to the reference voltage terminal 11 of the power ad...

Embodiment 2

[0051] Such as figure 2 , A schematic diagram of the circuit of the second embodiment of the present invention; image 3 Yes figure 2 The structure of the reference voltage module 40 in the embodiment is schematic; Figure 4 Yes figure 2 The structure of the reference current module 30 in the embodiment is schematic; the second embodiment will be described with reference to the three figures:

[0052] The power adjustment module 10 has a sampling loop, including a resistor R0 and a capacitor C0 connected in parallel, which are connected between the anode of the backlight diode PD and the ground; the current flowing through the backlight diode PD has a sampling voltage on R0, and the sampling voltage is at the voltage The sampling terminal 12 is connected to the negative input terminal of a high-speed comparator COMP.

[0053] The positive input terminal of the high-speed comparator COMP is the reference voltage terminal 11, and its output terminal is connected to the gate of a r...

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Abstract

The invention discloses a laser driving circuit stabilizing an extinction ratio. The invention is characterized in that: apart from a power adjusting module and a difference driving module, the laser driving circuit also comprises a reference voltage module which outputs reference voltage and a reference current module which outputs reference current, wherein, voltage of a voltage sampling end isdirectly proportional to backlight diode photoelectric current, and the reference voltage and the reference current are controlled to maintain a same reduction proportion. According to the above scheme, the reference voltage and the reference current are reduced synchronously, and when reducing laser optical power, the extinction ratio is maintained. The scheme is concise and effective, can be compatible to the original power adjusting module and difference driving module, and has good applicability.

Description

Technical field [0001] The invention relates to an optical communication emission driving component, in particular to a laser driving circuit with a stable extinction ratio. Background technique [0002] For the field of optical communication, the extinction ratio is a commonly used index, which is determined by the ratio of the average power of the laser power used for communication at the logical "1" and the average power at the logical "0". This index has a great influence on maintaining the correctness of the code element discrimination. If the extinction ratio is insufficient, it is easy to cause misjudgment of the code element and affect the communication effect. [0003] In actual use, the power of the laser is often adjustable. According to the different needs of users, the laser will be set at different powers to work. However, if the power of the laser is directly changed, the extinction ratio of the laser will often change, which will inevitably increase the error rate ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S5/042H04B10/155H04B10/564
Inventor 林永辉
Owner XIAMEN UX HIGH SPEED IC
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