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Distributed feedback laser driving and modulating device and trace gas detection system

A technology of distributed feedback and lasers, which is applied in the field of lasers, can solve problems such as poor stability, low degree of modularization, and large noise, and achieve the effect of good stability and high integration

Inactive Publication Date: 2012-07-04
BEIJING RES CENT OF INTELLIGENT EQUIP FOR AGRI
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0004] 1. The analog circuit is complex and huge, which is not conducive to the integration of the system, and the degree of modularization is low;
[0005] 2. The stability is poor. For occasions where the stability of the laser is high, the analog control method is difficult to meet the requirements;
[0006] 3. The noise caused by the analog circuit itself is large, resulting in poor laser power stability and low wavelength modulation accuracy

Method used

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  • Distributed feedback laser driving and modulating device and trace gas detection system
  • Distributed feedback laser driving and modulating device and trace gas detection system
  • Distributed feedback laser driving and modulating device and trace gas detection system

Examples

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Embodiment 1

[0026] like figure 1 As shown, the distributed feedback laser drive modulation device of this embodiment (shown by the dotted line box in the figure) includes: a signal generation module, a conversion module and a temperature control module. in:

[0027] The signal generation module is used for generating signals for driving and modulating the distributed feedback laser. The conversion module is connected with the signal generation module, and is used for performing voltage and current conversion on the signal generated by the signal generation module, and outputting a current signal for driving the distributed feedback laser. The temperature control module is used to control the base temperature of the distributed feedback laser in a constant range. It can be a semiconductor cooling chip mounted on the base of the laser, and realizes the control of the base temperature of the laser in a PID (proportional, integral, differential control) method.

[0028] In this embodiment, ...

Embodiment 2

[0033] like figure 2 As shown, the distributed feedback laser drive modulation device of this embodiment includes:

[0034] SCM control unit 1, D / A chip 2 (eg DAC0832), DDS chip (eg AD9850) 3, analog superposition circuit 4, and voltage-current conversion module 5.

[0035] The single-chip control unit 1 writes the frequency control word to the D / A chip 2 to make it generate a sawtooth wave with a frequency of 10 Hz as the wavelength scanning signal of the laser 6; writes the frequency and phase control word to the DDS chip to make it generate a 5 Hz sine wave wave as the wavelength modulation signal of the laser 6. The analog superposition circuit 4 superimposes the sawtooth wave signal and the sine wave signal, and outputs it to the voltage-current conversion module 5. The voltage-current conversion module 5 converts the voltage signal obtained by superimposing the front sawtooth wave and the sine wave into a current signal, and the current signal It can drive the laser 6...

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Abstract

The invention discloses a distributed feedback laser driving and modulating device and a trace gas detection system, which relate to the technical field of lasers. The distributed feedback laser driving and modulating device comprises a signal generating module and a conversion module, wherein the signal generating module is used for generating signals for driving and modulating a distributed feedback laser, and the conversion module is connected with the signal generating module and used for performing voltage and current conversion on the signals generated by the signal generating module and outputting current signals for driving the distributed feedback laser. Compared with the traditional driving and modulating methods, the distributed feedback laser driving and modulating device and the trace gas detection system have higher integrated degree and better stability, and can well meet work requirements for driving the distributed feedback laser and modulating wavelength.

Description

technical field [0001] The invention relates to the technical field of lasers, in particular to a distributed feedback laser drive modulation device and a trace gas detection system. Background technique [0002] Distributed feedback lasers have the advantages of good monochromaticity, good coherence, high beam alignment accuracy, small size, and convenient use, and have been widely used in the fields of communication and trace gas detection. Especially in recent years, distributed feedback lasers have been widely used in open optical path gas monitoring, such as gas monitoring, vehicle exhaust detection, natural gas leakage monitoring, etc. However, the semiconductor laser has strict requirements on the working conditions, and the fluctuation of the driving current will not only cause the laser intensity noise of the laser, but also cause the broadening of the output wavelength spectral linewidth. In an open laser absorption spectroscopy gas monitoring system composed of d...

Claims

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Application Information

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IPC IPC(8): H01S5/042H01S5/06G01N21/39
Inventor 董大明郑文刚邢振田宏武姜凯冯青春赵志
Owner BEIJING RES CENT OF INTELLIGENT EQUIP FOR AGRI
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