Photonic crystal fiber polarizer

Abstract

The invention discloses a photonic crystal fiber polarizer. The photonic crystal fiber polarizer is a section of photonic crystal fiber comprising a fiber core and cladding. A medium of the cladding is provided with a plurality of first air holes and two second air holes. The hole depth direction of the first air holes is the axial direction of the fiber, and the first air holes are distributed around the fiber core in a regular polygon mode; the two second air holes are located in the diameter part of circular fiber cross sections on the two sides of the fiber core, and there is no first air hole existing between the two second air holes for interference and obstruction; the two second air holes are each internally plated with a metal thin film with the thickness ranging from 20 microns to 90 microns so that coupled metallic waveguide can be formed between the two second air holes. The polarizer breaks through the limitation that the coverage rate of a second communication waveband of an existing fiber polarizer is low, and meanwhile a solution for achieving miniaturization and integration of a communication and sensing system is provided through the temperature adjusting polarization bandwidth character.

Description

technical field [0001] The invention relates to the technical fields of optical fiber communication and optical fiber sensing, in particular to a photonic crystal optical fiber tunable linear polarizer based on the principle of surface plasmon resonance and having ultra-wide bandwidth and high polarization extinction ratio. Background technique [0002] Optical fiber polarizers can convert incident unpolarized light or incompletely polarized light into linearly polarized light polarized in only one direction. It is one of the key components to ensure high-speed optical fiber communication and full-fiber sensor systems and miniaturization. In the optical fiber, due to the birefringence characteristics of the material itself and stress and other factors, the two orthogonal modes in the transmission will undergo polarization mode dispersion and polarization mode coupling, which will cause a series of optical device responses to be affected by random changes in the polarization s...

AI Technical Summary

Problems solved by technology

Existing manufacturing methods of fiber optic polarizers are different, and each has its own advantages in terms of insertion loss, polarization extinction ratio and transmission bandwidth. However, the coverage of the communication band (1250-1650nm) is generally low, and it is difficult to adjust the performance of the device after it is manufactured. , it is necessary to find a more effective mechanism to meet the needs of the communication and sensing fields

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