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Noise suppression method based on phase continuous swept-frequency fiber laser

A fiber laser and noise suppression technology, applied in the optical field, can solve problems such as unrealistic system, large electrical noise, precise control and suppression of noise, etc.

Active Publication Date: 2020-07-10
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

[0005] In addition, it is difficult to achieve high-precision and large-range linear frequency sweep due to excessive electrical noise and existing loop design
The influence of electrical noise on the system cannot be effectively suppressed by existing technology methods, and the combination of common low-pass filters and integrators cannot achieve precise control of the system and suppress noise

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  • Noise suppression method based on phase continuous swept-frequency fiber laser
  • Noise suppression method based on phase continuous swept-frequency fiber laser
  • Noise suppression method based on phase continuous swept-frequency fiber laser

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Embodiment Construction

[0042] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0043] refer to figure 1 As shown, the embodiment of the present invention provides a noise suppression method based on a phase-continuous frequency-swept fiber laser, including: steps S1 to S5;

[0044] S1. In the open-loop state of the frequency-sweeping laser light source system, a set of control voltage signals is obtained through a pre-distortion algorithm, and the response linearity of the frequency-sweeping fiber laser is pr...

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Abstract

The invention discloses a noise suppression method based on a phase continuous swept-frequency fiber laser. The method comprises the steps: in an open-loop state, obtaining a group of control voltagesignals through a pre-distortion algorithm, and carrying out preliminary correction on the response linearity of the swept-frequency fiber laser under the drive of the control voltage signals; on thebasis, adding a phase-locked system to form a closed-loop state, a beat frequency signal with sweep frequency information generated after the sweep frequency optical signals pass through a Mach-Zehnder interference structure and a reference signal being compared by a phase discriminator, and outputting an error signal; inputting the error signal into a high-order loop filter, and driving an optical fiber laser to output an optical signal of which the frequency is modulated after the error signal is filtered and amplified; analyzing the modulated optical signal through a real-time spectrum analyzer, and verifying a phase locking result; and after the beat frequency signal and the reference signal are locked, the modulated optical signal being a swept-frequency optical signal after noise suppression. According to the method, the influence of sweep frequency noise, nonlinear noise and inherent noise of the laser on the system is effectively suppressed.

Description

technical field [0001] The present invention relates to the field of optical technology, such as: optical frequency modulation technology, optical frequency modulation continuous wave measurement technology, optical coherence measurement technology, optical phase-locked loop technology, and in particular to a noise suppression method based on phase continuous frequency-sweeping fiber laser. Background technique [0002] Optical FM continuous wave is a technology that obtains parameters such as the position and speed of the measured target by measuring the frequency domain response of the beat frequency signal obtained by coherently transmitting the optical signal and the echo signal. Its core module is a laser that requires linear frequency modulation source. [0003] Among various types of laser sources, the narrow linewidth fiber laser is the most practical, because its output frequency can be flexibly controlled by controlling its internal piezoelectric ceramic crystal di...

Claims

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Application Information

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IPC IPC(8): H01S3/067H01S3/13
CPCH01S3/067H01S3/1305H01S3/1307
Inventor 冯宇祥谢玮霖董毅孟银霞
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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