Hollow-core anti-resonance optical fiber polarization filter

Abstract

The invention, which belongs to the technical field of photonic crystal fibers, particularly relates to a hollow-core anti-resonance optical fiber polarization filter comprising a fiber core region and a cladding region. The fiber core region is a vacuum region; and the cladding region coats the outside of the fiber core region. The cladding region includes an inner cladding and an outer claddingwrapping the inner cladding; the inner cladding is formed by an annular ring formed by equal-interval distribution of a plurality of capillary tubes. The capillary tubes distributed in the y-axis direction are filled with metal and other capillary tubes are not filled with metal in the annular ring formed by the capillary tubes of the inner cladding. When the fiber core mode and the SPP mode meetthe phase matching condition, resonance coupling, that is, a surface plasmon resonance effect is made. The designed metal filling type hollow-core anti-resonance optical fiber has the good polarization filtering function in a communication waveband and the low-loss integration with the hollow-core anti-resonance optical fiber is realized, so that the application field of the hollow-core anti-resonance optical fiber is further widened.

Description

technical field [0001] The invention belongs to the technical field of photonic crystal fibers, and in particular relates to a hollow-core anti-resonance fiber with polarization filtering function. Background technique [0002] Polarization filter is an essential and important optical device in optical fiber communication system and optical fiber sensing system, and plays its unique role in various fields. Therefore, polarization devices such as fiber polarization filters that are miniaturized, stable, and easily integrated with other optical fibers have long been the focus of research. With the development trend of miniaturization and integration of optical devices, the metal-type photonic crystal fiber polarization filter can realize the excitation of surface plasmon polariton (SPP mode) by filling the air hole of the fiber or coating the metal film. The polarization filtering effect of the optical fiber can be realized by using the surface plasmon resonance effect when t...

AI Technical Summary

Problems solved by technology

In addition, in order to separate the loss peaks of the two fundamental modes in the polarization direction, it is usually necessary to implement a photonic crystal fiber through various methods such as introducing cladding asymmetry, modifying the air hole size, or even filling the cladding air hole with liquid. High birefringence, which brings difficulties to the actual fabrication of polarizing devices

Images