An all-fiber narrow-linewidth fiber laser device and method for optical frequency transmission

A fiber laser, all-fiber technology, applied in the field of lasers, can solve problems such as unfavorable applications, and achieve the effects of reduced sensitivity, easy integration, and low cost

Active Publication Date: 2020-01-21
NAT TIME SERVICE CENT CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These relatively harsh experimental conditions are not conducive to its application in actual engineering

Method used

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  • An all-fiber narrow-linewidth fiber laser device and method for optical frequency transmission
  • An all-fiber narrow-linewidth fiber laser device and method for optical frequency transmission
  • An all-fiber narrow-linewidth fiber laser device and method for optical frequency transmission

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Experimental program
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Embodiment

[0041] as attached figure 1 As shown, the narrow linewidth laser system used for optical frequency transmission in this embodiment consists of the following components:

[0042] Fiber laser: with PZT tuning function, the line width Δν is about 2kHz, and the center wavelength is 1550nm;

[0043] Frequency shifter 1: The frequency shift value is 40MHz, and the coupling efficiency is 62%. It performs frequency modulation on the laser and also plays the role of phase compensation modulation;

[0044] The first Y-type coupler: the splitting ratio is 90:10, most of the laser is used for optical frequency transmission;

[0045] Isolator: The isolation is 30dB, preventing optical feedback from interfering with the laser;

[0046] X-type coupler: split ratio 50:50;

[0047] The second Y-type coupler: directional 1*2 coupler, the splitting ratio of f-end and e-end is 90:10. The maximum order of the beat frequency signal that is directly affected by the splitting ratio, the more ligh...

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Abstract

The invention discloses a light frequency transmission used all-fiber narrow linewidth fiber laser device and the method thereof. The device of the invention comprises a laser, a first frequency shift device, an isolator, a first Y type coupling device, an X type coupling device, an attenuator, a first Faraday rotating mirror, a second Y type coupling device, a second Faraday rotating mirror, a second frequency shift device, a time-delay fiber, an optical fiber amplifier, a third frequency shift device, a third Faraday rotating mirror, a photoelectric detector, a band pass filter, an oscilloscope, and a frequency synthesizer. According to the invention, under the condition that the frequency discrimination precision of an interferometer is reduced, the length of the time-delay optical fiber could be shortened; the frequency discrimination precision could be increased; the cost can be reduced and the device can be transported.

Description

technical field [0001] The invention belongs to the technical field of lasers, and relates to a fiber laser, in particular to an all-fiber narrow-linewidth fiber laser device and method for optical frequency transmission. Background technique [0002] Narrow linewidth lasers have extremely low phase noise and excellent coherence length, and have important and extensive applications in scientific research and technology fields: such as optical clocks, high-precision spectroscopy, and time-frequency transfer. In the field of optical fiber time-frequency transmission with the highest transmission accuracy, narrow-linewidth lasers in the communication band are an important guarantee for ultra-long-distance ultra-high-precision optical frequency transmission. With the rapid development of rare earth-doped optical fibers, the linewidth of commercial fiber lasers can reach the order of kHz, but it is still difficult to meet the requirements of ultra-high-precision long-distance fre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S3/067H01S3/13H01S3/00
CPCH01S3/0057H01S3/06754H01S3/1301H01S3/1305
Inventor 高静刘涛焦东东邓雪臧琦董瑞芳张首刚
Owner NAT TIME SERVICE CENT CHINESE ACAD OF SCI
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