Optical-fiber far-field spherical scanning device used for PCF effective area measurement and method thereof

Abstract

The invention provides an optical-fiber far-field spherical scanning device used for pohotonic crystal fiber (PCF) effective area measurement. The device comprises an optical-fiber collimation system, a focusing microscope system, a photoelectric detector and an electric control displacement platform. The PCF to be measured is adjusted by the optical-fiber collimation system so as to ensure that an emergent end surface of an optical fiber to be measured is located at a conjugate point of the electric control displacement platform. The microscope focusing system is used to observe a cutting state of an optical fiber end surface. The photoelectric detector installed on the electric control displacement platform receives far field light field distributions of optical-fiber end-surface emergent light under different azimuth angles in real time, calculates and acquires an effective area parameter of the measured PCF. In the invention, a photoelectric encoder, a data display instrument and a phase-locked amplifier data acquisition system are adopted, program control operation is achieved and test precision is high, an extraneous interference is small and tests of the PCF effective areas under different kinds of structures can be satisfied.

Description

technical field [0001] The invention relates to the technical field of testing, in particular to an optical fiber far-field spherical scanning device for measuring the effective area of ​​a PCF, and also relates to an optical fiber far-field spherical scanning method for measuring the effective area of ​​a PCF. Background technique [0002] Photonic crystal fiber (PCF) is a new type of special optical fiber whose cladding is periodically arranged along the axial direction by air holes-quartz. It has a wide range of applications in cutting-edge fields such as terahertz, fiber optic gyroscopes, and femtosecond laser combs. The effective area is an important parameter to characterize the performance of PCF. It determines the nonlinear coefficient of PCF and is closely related to the macrobending loss and splicing loss of optical fiber. Therefore, accurate measurement of the effective area of ​​PCF is of great significance for its early structural design and subsequent practica...

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