Optical fibre wavelength-division multiplex device

Abstract

The invention relates to an optical fiber wavelength division multiplexer based on a photonic crystal fiber structure; the optical fiber wavelength division multiplexer is a three-core photonic crystal fiber, comprising a matrix material, a cladding formed by air vents and three fiber cores. The middle of the optical fiber is provided with a fiber core; each side of the fiber core at the middle of the fiber is provided with a fiber core; the three fiber cores have different refractive index distribution; the basic mode of the fiber core at the middle has the same effective refractive index with the fiber core of one side at and only at a certain wavelength position Lambada1, and the basic mode of the fiber core at the middle has the same effective refractive index with the fiber core of the other side at and only at another certain wavelength position Lambada2. The wavelength division multiplexer can separate the optical signals including Lambada1 and Lambada2 input by the fiber core at the middle, and output the signals respectively from the left fiber core and the right fiber core. The fiber multiplexer is characterized by having smaller size and large isolation, allowing the fiber length to have relatively large manufacturing error, realizing mass production, outputting the light from two fiber cores with larger gap, facilitating the optical coupling to other optical fibers, etc.

Description

technical field [0001] The invention relates to the field of optical fiber communication, in particular to an optical fiber wavelength division multiplexer based on a photonic crystal optical fiber structure. Background technique [0002] The dual-core optical fiber is an optical device that uses the coupling effect of the optical evanescent field between the two cores to realize multiple selection functions such as optical power, wavelength, and polarization state. Dual-core and multi-core fibers can be obtained conveniently by using the photonic crystal fiber structure. Dual-core photonic crystal fiber is not only easier to manufacture than traditional dual-core fiber, but also can be made smaller in device size, so it has attracted widespread attention. An important application of dual-core optical fiber is as a wavelength division multiplexer / demultiplexer (WDM / DWDM) in optical fiber communication. Although the dual-core photonic crystal fiber is more flexible in terms...

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