Measuring device and method for polarization-maintaining fiber birefringence coefficient based on soliton self-frequency shifting

Abstract

The invention discloses a measuring device for a polarization-maintaining fiber birefringence coefficient based on soliton self-frequency shifting, and the device comprises a femtosecond laser (1), an ultrashort pulse power and polarization state adjustment part consisting of an electronically controlled liquid crystal wave plate (2), a polarization beam splitting prism (3), a half-wave plate (4), a beam expander (5) and a fiber coupling mirror (6), a high nonlinear polarization-maintaining photonic crystal fiber (7), and a spectral coherence and detection part consisting of a fiber collimator beam expander (8), a first 50:50 splitter (9), a first mirror (10), an adjustable attenuator (11), a second mirror (12), an adjustable spatial light delay line (13) and a second 50:50 splitter (14). The measurement of the birefringence coefficient of the optical fiber can be realized by measuring the relative delay of the optical soliton in the fast axis and the slow axis by spectral coherence. The measuring device provided by the invention can measure the change of the birefringence coefficient of the optical fiber when the wavelength is continuously adjusted in a large range, and the measurement result is accurate and reliable.

Description

technical field [0001] The invention belongs to the field of nonlinear optical fiber optics and optical fiber parameter measurement, in particular to a measuring device and method for polarization-maintaining optical fiber birefringence coefficient. Background technique [0002] Since the polarization-maintaining fiber can keep the polarization state of light unchanged during transmission, it has been widely used in the fields of optical fiber communication, optical fiber sensing, and nonlinear optics. The birefringence coefficient is one of the important parameters to measure the polarization maintaining fiber. Accurate measurement of the birefringence coefficient of the polarization maintaining fiber plays an important role in improving the communication rate of coherent optical communication systems, increasing the measurement performance of fiber optic sensors, and exploring the nature of fiber nonlinear effects. , and has an important feedback effect on parameter optimi...

AI Technical Summary

Problems solved by technology

In addition, due to the development of nonlinear fiber optics technology, ultrashort pulses with narrow pulse width, high peak power, and high energy density , has a certain influence on the birefringence coefficient of the fiber, and the change of the birefringence coefficient of the fiber at such a high energy density cannot be measured using traditional optical measurement techniques

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