Optical fiber link time-frequency distribution device based on femtosecond laser and stabilizing method thereof

A fiber optic link and time-frequency distribution technology, applied to clocks driven by synchronous motors, electronic timers, instruments using atomic clocks, etc., can solve difficult clock synchronization accuracy requirements and other problems, and achieve long-term stability Effect

Inactive Publication Date: 2016-03-30
TIANJIN UNIV
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Problems solved by technology

[0003] At present, the clock synchronization achieved by various domestic time-frequency distribution methods is generally on the order of picoseconds (ps

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  • Optical fiber link time-frequency distribution device based on femtosecond laser and stabilizing method thereof
  • Optical fiber link time-frequency distribution device based on femtosecond laser and stabilizing method thereof

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Embodiment Construction

[0023] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments, and the described specific embodiments are only for explaining the present invention, and are not intended to limit the present invention.

[0024] In order to realize the high-precision index for clock synchronization of large scientific devices, a femtosecond laser-based optical fiber link time-frequency distribution device proposed by the present invention has a structure such as figure 1 As shown, including master clock transmitter, isolator 2, half-wave plate 3, polarizing beam splitter 4, first quarter-wave plate 7, second quarter-wave plate 5, first reflection Mirror 6, piezoelectric ceramic fiber stretcher 12, fiber link 13, Er-doped 3+ A fiber amplifier 14, a Faraday rotator 15 and a clock error detection unit. Such as figure 1 As shown by the dashed box in , the clock error detection unit includes a...

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Abstract

The invention discloses an optical fiber link time-frequency distribution device based on femtosecond laser. The optical fiber link time-frequency distribution device comprises a main clock transmitter, an isolator, a half-wave plate, a polarization beam splitter, two quarter-wave plates, a reflecting mirror integrated with a stepping motor, a piezoelectric ceramic fiber stretcher, an optical fiber link, an Er<3+> doped optical fiber amplifier, a Faraday polariscope and a clock error detection unit composed of a balance optical cross-correlation system, a PI controller, a data acquisition card and a computer. Two beams of optical pulse signals received by the clock error detection unit are locked within a specific error range by adjusting parameters of the PI controller. The optical fiber link time-frequency distribution device adopts an erbium-doped fiber femtosecond laser locked to a hydrogen maser clock and based on nonlinear polarization evolution (NPE) as the main clock transmitter, utilizes the matching between the piezoelectric ceramic fiber stretcher and the stepping motor to compensate clock errors, achieves femtosecond-level clock synchronization errors in a kilometer-level optical fiber link and ensures long-time stability of the optical fiber link.

Description

technical field [0001] The invention relates to a fiber link stabilization system based on femtosecond laser. Background technique [0002] Large scientific installations play an increasingly important role in promoting basic scientific exploration, biomedicine, and national economic development. Due to its characteristics of large construction scale, complex structure, and comprehensive technology, it puts forward strict requirements for the collaborative control between various functional components. For example, X-ray free-electron laser (XFEL), as the fourth-generation light source, can generate femtosecond X-ray pulses with high repetition rate, high coherence, and ultra-high brightness, and its brightness is nine orders of magnitude higher than that of the third-generation synchrotron radiation light source. A new commanding height in the research of scientific installations at Shanghai University. The XFEL is based on a linear accelerator structure, with a length ra...

Claims

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Application Information

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IPC IPC(8): G04F5/14G04G7/00
CPCG04F5/14G04G7/00
Inventor 宋有建马春阳刘博文胡明列王清月
Owner TIANJIN UNIV
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