A Tunable Filter Based on Selective Filling-like Dual-Core Photonic Crystal Fiber

Abstract

A tunable filter based on selective filling of quasi-dual-core photonic crystal fiber, characterized in that a quasi-dual-core structure is obtained by filling the air hole in the cladding of solid-core photonic crystal fiber with a high refractive index liquid, and the liquid column and quartz The core region constitutes two waveguides, which can realize the energy coupling of the optical field from the core to the liquid column when the refractive index matching coupling condition is met, and then generate a series of resonance peaks in the transmission spectrum. The device can be applied to the fields of multi-band tunable filtering, wavelength division multiplexing / demultiplexing, multi-parameter simultaneous sensing, vector sensing and the like. Compared with previously reported liquid-filled photonic crystal fiber filters, the present invention has a wide sensing range for external parameters, resonant peaks with different temperature and stress characteristics in multiple bands, and good linear tuning of resonant wavelengths. It has the characteristics of high resonance wavelength tuning rate, wide tuning range, low insertion loss, simple implementation, and high spectral stability.

Description

technical field [0001] The invention belongs to the technical field of optical fiber communication and optical fiber sensing, relates to the selective filling of photonic crystal fiber, and obtains a class of double-core photonic crystal fiber tunable filter. The main features of this filter are wide operating wavelength range, fast wavelength tuning, and simple and easy tuning means. In addition, this structure also has advantages in the fields of wavelength division multiplexing / demultiplexing, multi-parameter simultaneous sensing, and optical fiber vector sensing. Very good potential application value. Background technique [0002] Photonic Crystal Fiber (PCF), also known as Microstructured Optical Fiber (MOF), is a new type of optical fiber based on photonic crystal theory. Due to the periodic air microholes in the fiber cross-section, compared with traditional fibers, its structural design is more flexible, and it has unlimited single-mode transmission, large mode fiel...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the common problems of slow wavelength tuning rate, narrow tuning range and poor tuning linearity in existing tunable optical fiber filters, and to provide a tunable filter similar to dual-core photonic crystal fiber based on selective filling. The filter can be tuned and filtered by controlling the ambient temperature of the fiber and the stress applied to the fiber

Images