Linear frequency modulation single frequency pulse optical fiber laser device

A fiber laser, linear frequency modulation technology, applied in lasers, laser parts, phonon exciters, etc., to achieve the effect of large modulation bandwidth, high frequency modulation linearity, and fast modulation speed

Active Publication Date: 2016-04-06
CHENGDU UNIV OF INFORMATION TECH
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Problems solved by technology

[0003] There are no reports of other high peak power pulsed lasers with large time-width-bandwidth product signal characteristics

Method used

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  • Linear frequency modulation single frequency pulse optical fiber laser device
  • Linear frequency modulation single frequency pulse optical fiber laser device
  • Linear frequency modulation single frequency pulse optical fiber laser device

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Embodiment Construction

[0029] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0030] The application principle of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0031] refer to figure 1 , linear frequency modulation single-frequency pulse fiber laser consists of: narrow linewidth seed source 1, dual parallel phase modulator 2, fiber beam splitter 3, acousto-optic modulator 4, fiber amplifier 5, radio frequency signal source 6, electro-optic modulator A driver 7, an acousto-optic modulator driver 8, an output end 9 of an optical fiber splitter, and an output end 10 of an optical fiber amplifier. in:

[0032] The narrow linewidth seed source ...

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Abstract

The invention discloses a linear frequency modulation single frequency pulse optical fiber laser device. The laser device comprises a narrow linewidth seed source, a radio-frequency signal source, an electro-optic modulator driver, a double-parallel phase modulator, an optical fiber beam splitter, an acoustic-optic modulator driver, an acoustic-optic modulator and an optical fiber amplifier. According to the laser device, broadband linear frequency modulation is conducted through the 2*2 MZI structure double-parallel phase modulator, pulse chopping is conducted through the acoustic-optic modulator, and high peak value power output is achieved through the optical fiber amplifier. The laser device has the advantages of being high in peak value power, large in modulation bandwidth, high in modulation speed, high in modulation linearity, simple in structure, capable of achieving the all-fiber laser, safe to human eyes, capable of achieving linear polarization output and capable of satisfying the application requirements of a remote high resolution distance measurement and velocity measurement laser radar for the laser source and can be applied to such fields as remote coherent distance measurement, synthetic aperture / retro-synthetic aperture laser radars and space situation awareness.

Description

technical field [0001] The invention belongs to the technical field of laser radar, in particular to a linear frequency modulation single-frequency pulse fiber laser. Background technique [0002] In order to improve the operating range, distance resolution and velocity resolution of the laser radar, it is required that the emitted laser signal has the characteristics of large time-width and bandwidth. Chirp signal and phase-coded signal are two typical large-time-width-bandwidth signals. The linear frequency modulation continuous wave technology used in synthetic aperture lidar technology also has two situations of continuous laser emission and pulse emission in terms of laser duration. Even in the case of pulse transmission, the duration of the pulse must be much longer than the flight time of the echo signal of the target object. The advantage is that it can realize down-frequency processing of high modulation frequency, obtain low intermediate frequency signal, and redu...

Claims

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Application Information

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IPC IPC(8): H01S3/10H01S3/067
CPCH01S3/06754H01S3/10007H01S3/10053
Inventor 伍波李琨
Owner CHENGDU UNIV OF INFORMATION TECH
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