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Laser driving circuit stabilizing extinction ratio

A technology for driving circuits and lasers, which is applied to lasers, laser components, semiconductor lasers, etc., can solve problems such as increasing the misjudgment rate of code elements, and achieve the effects of simple circuits, strong practicability, and reduced optical power

Active Publication Date: 2013-07-03
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
Comparison scheme
Effect test

Embodiment 1

[0033] 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 negative electrode of the laser LD and the ground, and then connected to the positive electrode 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, wherein the voltage value of the voltage sampling terminal 12 is proportional to the photocurrent of the backlight diode PD.

[0034] A differential driving module 20, the first and second differential driving terminals 21 and 22 are respectively connected to the positive and negative poles of the laser LD; the differential driving module 20 has a common-mode current terminal 23 to the ground, which has a reference current to the ground Determined by the reference current module 30 .

[0035] In actual operation, the reference voltage module 40 outputs a reference voltage Vr...

Embodiment 2

[0052] like figure 2 , a schematic circuit diagram of the second embodiment of the present invention; image 3 Yes figure 2 A schematic diagram of the structure of the reference voltage module 40 in the embodiment; Figure 4 Yes figure 2 The structure of the reference current module 30 in the embodiment is illustrated; the second embodiment will be described with reference to the three figures:

[0053]The power adjustment module 10 has a sampling loop, including a parallel resistor R0 and a capacitor C0, 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.

[0054] The positive input terminal of the high-speed comparator COMP is the reference voltage terminal 11, and the output terminal of the high-speed comparator COMP ...

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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 stable extinction ratio. Background technique [0002] For the field of optical communication, the extinction ratio is a common index, which is determined by the ratio of the average power of the laser power used for communication at logic "1" to the average power at logic "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 to work at different powers. However, if the power of the laser is directly changed, the extinction ratio of the laser is often changed, which will inevitably increase the misjudgment rate of the sym...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S5/042H04B10/50H04B10/564
Inventor 林永辉
Owner XIAMEN UX HIGH SPEED IC