Device for measuring beat length of polarization maintaining fiber

Abstract

The invention discloses a device for measuring the beat length of a polarization maintaining fiber. The device is characterized in that the device includes a wide-spectrum light source, a fiber polarizer, a spectrum analyzer and a computer; the wide-spectrum light source passes through the fiber polarizer and then enters a to-be-measured highly birefringent polarization maintaining fiber; the signal output end of the to-be-measured highly birefringent polarization maintaining fiber is connected with a polarization analyzer; the to-be-measured highly birefringent polarization maintaining fiberand the polarization analyzer constitute a Mach-Zehnder interferometer; an electro-optic modulator is arranged at the signal output end of the Mach-Zehnder interferometer; an optical microwave signalon the electro-optic modulator is incident on a high-speed photoelectric detector after passing through a dispersion fiber; the high-speed photoelectric detector converts the optical signal into a microwave signal which is then amplified by a low-noise amplifier; and the output end of the low-noise amplifier is connected with a microwave power divider. The to-be-measured highly birefringent polarization maintaining fiber and the polarization analyzer are connected at 45 degrees by means of welding at the other end, and the joint is very tight and strong, will not have gaps and is very stable.The device has the characteristics of large processing capacity, convenience and practicality, and the like.

Description

technical field [0001] The invention relates to the field of measuring the beat length of polarization-maintaining optical fibers, in particular to a measuring device for the beat length of polarization-maintaining optical fibers. Background technique [0002] Polarization-maintaining optical fiber transmits linearly polarized light, and is widely used in various fields of national economy such as aerospace, aviation, navigation, industrial manufacturing technology and communication. In the interferometric optical fiber sensor based on optical coherent detection, the use of polarization-maintaining optical fiber can ensure that the linear polarization direction remains unchanged, improve the coherent signal-to-noise ratio, and achieve high-precision measurement of physical quantities. As a special optical fiber, polarization maintaining optical fiber is mainly used in optical fiber gyroscopes, optical fiber hydrophones and other sensors and optical fiber communication system...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the defect that the polarization maintaining performance of the existing polarization maintaining optical fiber is difficult to detect during the working process, and provide a measuring device for the beat length of the polarization maintaining optical fiber, thereby solving the above problems

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