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Pilot-adaptive Mach-Zehnder modulator laser pulse adjustment module

A technology of laser pulse and adjustment module, which is applied in the direction of instruments, electromagnetic wave transmission systems, electrical components, etc., can solve the problem that the working point of the Mach-Zehnder modulator cannot be stabilized, and achieve the effect of avoiding interference and realizing the working point

Active Publication Date: 2020-02-04
CHINA JILIANG UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to provide a pilot-adaptive Mach-Zehnder modulator laser pulse adjustment module to solve the problem that the working point of the Mach-Zehnder modulator cannot be stabilized due to the interference of the pulse signal to the pilot

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Embodiment Construction

[0015] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0016] Such as figure 1 As shown, the pilot adaptive Mach-Zehnder modulator laser pulse adjustment module of the present invention includes a laser (1), a Mach-Zehnder modulator (2), a fiber coupler (3), and a DSP bias control module (4) , a pulse output module (10). The laser (1) is used as the light source of the whole system and is connected to the Mach-Zehnder modulator (2) to load information. The DSP bias control module (4) realizes the stabilization of the working point of the Mach-Zehnder modulator (2). The pilot frequency of a certain amplitude and frequency generated by the DSP module (7) is loaded on the bias voltage and transmitted to the Mach-Zehnder modulator (2) after passing through the output filter network (8), and the output optical signal passes through the fiber coupler (3 ) part of the light is sent to the DSP bias c...

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Abstract

The invention relates to a pilot-adaptive Mach-Zehnder modulator laser pulse adjustment module. The pilot-adaptive Mach-Zehnder modulator laser pulse adjustment module comprises a laser, a Mach-Zehnder modulator, an optical coupler, a DSP bias voltage control module, and a pulse output module, wherein the DSP bias voltage control module produces a pilot signal for the Mach-Zehnder modulator and then feeds back an output light signal to the DSP bias voltage control module for FFT, so as to obtain amplitude components and phase relations of corresponding first harmonic and secondary harmonic, aharmonic amplitude ratio is used as an error signal, so as to make a working point of the Mach-Zehnder modulator stabilize at a NULL point through digital PID; a pulse signal is loaded for pulse adjustment; pulses at different frequencies have different interference on pilot, as a result, the NULL point cannot be stabilized, the DSP bias voltage control module adjusts frequency of the pilot adaptively till the NULL point is stabilized again. Due to introduction of the pilot adaptive adjustment technology, output of high extinction ratio of laser pulse of any frequency is realized.

Description

technical field [0001] The invention relates to a pilot adaptive Mach-Zehnder modulator laser pulse adjustment module, which is suitable for the field of pulse laser radar. Background technique [0002] Lidar (LiDAR) is a radar detection system that uses a laser as a source of emission. In addition to being used in military and national defense fields such as battlefield detection, underwater detection, laser guidance, and satellite remote sensing, pulsed lidar is also widely used in civilian fields such as vegetation detection, laser communication, atmospheric monitoring, urban planning, and traffic safety. It has made great contributions to national defense security, social economy and scientific research. [0003] Laser pulses in pulsed lidar systems are mostly generated by modulators. Adjust the bias operating point of the Mach-Zehnder modulator to make it work at the NULL point, and then load the pulse signal at the radio frequency port to realize laser pulse adjustme...

Claims

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Application Information

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IPC IPC(8): G01S7/484H04B10/524
CPCG01S7/484H04B10/524
Inventor 周鹏威卢田吕晋阳
Owner CHINA JILIANG UNIV
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