Multichannel wavelength division multiplexer

Abstract

The invention provides a multichannel wavelength division multiplexer which comprises first collimators, second collimators and a refraction layer. The refraction layer is arranged between the first collimators and the second collimators; the refraction layer further comprises a left refraction layer and a right refraction layer; first film filters and second film filters are arranged in the rightrefraction layer; and first film filters and a high-reflectivity mirror are arranged in the left refraction layer. According to the multichannel wavelength division multiplexer in the above the structure, signal light beams reflected by the first or second film filters are shaped by arranging the high-reflectivity mirror, so that the signal light beams are clustered again and can be spread further; and therefore, the size of a light spot can be completely received by the subsequent collimators, and the purposes of low loss and long working distance are achieved.

Description

technical field [0001] The invention relates to optical communication, in particular to a multi-channel wavelength division multiplexer. Background technique [0002] A wavelength division multiplexer is a device that combines a series of optical signals carrying information but with different wavelengths into one bundle and then transmits them along a single optical fiber, or splits signal lights of different wavelengths in a single optical fiber into multiple beams. A device that propagates an independent wavelength. Existing wavelength division multiplexers can combine and arrange a series of thin film filters to realize the function of multiplexing or demultiplexing signal beams, so a certain length of transmission distance is required. However, with the extension of the propagation distance, the diameter of the signal beam spot will expand, which limits the transmission distance; and the existing thin-film filter has a thick coating, and the naturally formed surface te...

AI Technical Summary

Problems solved by technology

However, with the extension of the propagation distance, the diameter of the signal beam spot will expand, which limits the transmission distance; and the existing thin-film filter has a thick coating, and the naturally formed surface tension makes its microscopic upper surface It is a convex surface, which further exacerbates the expansion of the spot diameter of the signal beam

The signal beam inside the wavelength division multiplexer will undergo multiple reflections. Every time it is reflected by the thin film filter, the beam will be expanded once. The enlarged spot will make it difficult for the receiving device to receive all the light energy. resulting in greater insertion loss;

[0003] The patent document (application number: 2016102085751) discloses a free-space high-port dense wavelength division multiplexer, such as figure 1 As shown, the technical solution of this patent is to install a relay lens between each collimator (receiving device) to shape the signal beam, thereby prolonging the propagation distance of the signal beam, but the installation of the relay lens will lead to an increase in the cost of the device. Conducive to reducing the application cost of technology

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