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Emergency monitoring method and circuit for laser dispensing with backlight diodes

A technology of backlight diodes and monitoring circuits, applied in the field of lasers, can solve the problems of occupying product cost and space, and achieve the effects of improving product revenue, simple and reliable circuits, and conducive to judgment.

Inactive Publication Date: 2012-07-18
XIAMEN UX HIGH SPEED IC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the backlight diode is often used as an essential component of the monitoring laser, and is packaged in the laser module at the same time, occupying a certain product cost and space

Method used

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  • Emergency monitoring method and circuit for laser dispensing with backlight diodes
  • Emergency monitoring method and circuit for laser dispensing with backlight diodes
  • Emergency monitoring method and circuit for laser dispensing with backlight diodes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Such as figure 1 , a schematic diagram of Embodiment 1 of the present invention; the positive terminal of the laser LD is connected to Vdd, and its negative terminal is connected to the DC bias current source Bias through R9. In common settings, the driving module Drv needs to be connected between the negative terminal of the laser LD and the ground In this case, another sampling resistor R4 is also included in the driving current loop, and the voltage sampling unit 10 leads to a voltage sampling terminal 11 located at the low potential terminal of R4 .

[0035] Among them, under the setting of the current source Bias of the laser LD, when the laser burst is enabled, with I Bias The DC current bias of the laser LD is equivalent to a fixed voltage drop V th and in series with the internal resistance R ld ; Simultaneously drive module Drv with AC current i mod To drive the laser LD, the i mod The average value is denoted as I moda The sampling output terminal 13 is ...

Embodiment 2

[0044] Such as figure 2 As shown, the circuit principle diagram of the second embodiment of the present invention. Compared with Embodiment 1, the RC filter network constructed by the filter resistor R6 and the filter capacitor C0 constitutes the main part of the voltage sampling unit; the high-speed comparator 25 is used as the main part of the comparison unit, and its negative input terminal is used as the comparison input terminal 21, and the positive input terminal is used as the comparison input terminal 21. The input terminal serves as the reference threshold terminal 22.

[0045] The reference threshold terminal 22 is connected to a threshold setting unit, the threshold setting unit includes a voltage dividing resistor array composed of R0, R1, R2, and R3 connected in series, and the voltage dividing resistor array is connected in series between a current source and ground; The connection points between the piezoresistors R0, R1, R2, and R3 are respectively connected ...

Embodiment 3

[0049] Such as image 3 , a schematic diagram of Embodiment 3 of the present invention. Most of it is similar to the first embodiment, but the voltage sampling terminal 11 is directly connected to the negative terminal of the laser LD, and there is no sampling resistor between them. Such a circuit structure makes the sampling input terminal 11 receive:

[0050] ΔV=V off -V on =(I Bias +I moda )*R ld +V th -V thoff

[0051] It can be seen that compared with Examples 1 and 2, the same use of V th and V off However, there is no factor R4 that can expand ΔV, and the influence of R4 can be ignored in actual judgment.

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Abstract

The invention discloses an emergency monitoring circuit for a laser dispensing with backlight diodes. The emergency monitoring circuit is characterized by comprising a voltage sampling unit and a comparing unit, wherein the voltage sampling unit comprises a filter circuit, and the filter circuit comprises a voltage sampling terminal connected to a negative-terminal driving current branch circuit of the laser and a sampling output terminal filtering the AC voltage at the voltage sampling terminal into an average value; the comparing unit is provided with a comparison input terminal connected with the voltage sampling terminal, a reference threshold terminal connected with a reference threshold voltage and a comparison output terminal for outputting the result of voltage comparison between the comparison input terminal and the reference threshold terminal; and a voltage sampling resistor is arranged between the voltage sampling terminal and the negative terminal of the laser. The scheme utilizes the electric parameter characteristics of the laser per se, namely the difference value of equivalent voltage reduction in two states of the burst mode, as the judgment reference for decision-making. Backlight diodes of the laser are omitted, the cost is saved, the size of the laser is reduced and the product benefits and the convenience in structural design are improved.

Description

technical field [0001] The invention relates to a monitoring method and a monitoring circuit applied to an optical fiber communication laser, and is specifically applied to a laser working in a burst mode that does not need a backlight diode. Background technique [0002] In fiber-optic communication technology, lasers operating in burst mode have more and more applications. The working state of this burst mode is different from that of the continuous mode; the laser working in the burst mode will work continuously when it is authorized, and it will be turned off when it is canceled. This is to achieve the purpose of multi-time division of labor and avoid signal conflicts. Has its own diverse advantages. In this way, the laser needs to be monitored in real time to determine whether it is on, and the monitoring signal is used to coordinate the work of other lasers or other circuits. A common practice is to use the backlight diode inside the laser module to monitor the lumin...

Claims

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Application Information

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IPC IPC(8): H04B10/08H01S5/06H04B10/079H04B10/50
Inventor 林永辉
Owner XIAMEN UX HIGH SPEED IC
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