Liquid crystal photon crystal fiber tunable narrowband filter and manufacturing method thereof

Abstract

The invention provides a liquid crystal photon crystal fiber tunable narrowband filter and a manufacturing method thereof. The method comprises the following steps of: directly plating a multilayer dielectric film on a photon crystal fiber end face to form a one-dimensional photon crystal, performing photosensitive self-assembly film treatment on the dielectric film, and then performing polarization treatment under ultraviolet light; and butting two photon crystal fibers treated likewise on the dielectric film sides, injecting liquid crystal at the butted position, and putting the liquid crystal into a variable magnetic field to realize wavelength tuning function. The invention overcomes the defects of difficult coupling of the filter and an optical communication system, complex structure and mechanical motion, and meanwhile solves the problem of difficult liquid crystal control in a microscopic system. The tunable narrowband filter is easy to couple and easy to match with an all optical network, and has the advantages of simple structure, large tuning range, low cost and the like.

Description

technical field [0001] The invention relates to a tunable narrowband filter, and the invention also relates to a manufacturing method of an optical fiber liquid crystal photonic crystal tunable narrowband filter. Background technique [0002] In the modern information society, with the increasing amount of information to be transmitted, people's requirements for communication networks are also increasing. Dense wavelength division multiplexing (DWDM) technology is the best way to provide high-speed, large-capacity optical fiber communication systems. With the rapid development of DWDM in optical communication systems, the number of channels that a single optical fiber needs to accommodate is increasing. In order to Multiplexers and demultiplexers must be used to process a certain wavelength in multiple channels. At present, there are many ways to realize multiplexing and demultiplexing, mainly including thin-film optical filters, arrayed waveguide gratings, etc., but these ...

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Problems solved by technology

In the actual optical communication, it is based on optical fiber communication, which will cause the problem of difficult coupling between glass devices and optical fibers, and the use of glass will also lead to serious loss of optical energy.

[0004] At present, some people directly inject liquid crystals into photonic crystal fibers for tuning research. This structure can be used as a bandpass filter, but it cannot be used as a narrowband filter.

Moreover, the liquid crystal in the photonic crystal fiber cannot be controlled artificially, and the liquid crystal is in a chaotic arrangement, which leads to a decrease in the utilization rate of the liquid crystal, that is, a reduction in the wavelength tuning range of the liquid crystal with the same thickness, so the depth of liquid crystal injection in the optical fiber generally reaches 20 mm

Moreover, due to the chaotic arrangement of the liquid crystal, the light scattering of the liquid crystal is enhanced, so that the light loss reaches about 15-40dB / cm

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