Device and method for measuring high nonlinear optical fiber Verdet constants

Abstract

The invention discloses a device and method for measuring high nonlinear optical fiber Verdet constants, and belongs to the technical field of optical fiber communication and optical fiber sensing, in particular to a novel photon information processing technology based on optical fiber nonlinear effects and magneto-optic effects. According to the device and method for measuring the high nonlinear optical fiber Verdet constants, the Verdet constants of optical fibers are calculated by using the nonlinear coefficients of the optical fibers, optical pulses are generated by using a mode locking optical fiber laser, the optical pulses pass through a polarization controller, an erbium-doped optical fiber amplifier, a band-pass filter and an attenuator in sequence to obtain proper high power optical pulse signals, the initial root-mean-square spectrum width of the optical pulses before being input in the optical fibers and the maximum root-mean-square spectrum width of the optical pulses after passing through the optical fiber are measured by using a spectrograph, and the nonlinear coefficients of the optical fibers are calculated; a magnetic field is further applied to the optical fibers, the nonlinear coefficients of the optical fiber after the magnetic field is applied are calculated by adopting the same method, and the Verdet constants are calculated through the two times of the nonlinear coefficients of the optical fibers. Therefore, the device and the method for measuring the high nonlinear optical fiber Verdet constants have the advantages that the Verdet constants of the optical fibers are measured accurately and fast, and the operation is easy and convenient to carry out.

Description

Technical field: [0001] The invention belongs to the technical fields of optical fiber communication and optical fiber sensing, in particular a novel photon information processing technology based on optical fiber nonlinear effect and magneto-optic effect. Background technique: [0002] With the continuous growth of people's demand for information, new technologies such as optical fiber communication have achieved rapid development, and all-optical information processing technology has become a hotspot in people's research. received more and more attention. In some microwave and optical fields, magneto-optical effect devices have been widely used, such as magneto-optic modulators, optical isolators, microwave magneto-optic devices, and fiber optic current sensors. The Verdet constant is an important parameter to characterize the properties of magneto-optical materials, which affects the magnetron bias characteristics of magneto-optical devices and the sensitivity of magneti...

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Problems solved by technology

[0004] When using the traditional method to measure the Verdet constant of the material, it needs higher requirements on the polarization state of the light. Compared with the general magneto-optic crystal, the optical fiber often has a longer length, inherent birefringence, random birefringence, etc., which make The change of polarization state is more complex and difficult to measure accurately

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