Multi-channel wavelength space decomplex film device based on two-end thickness decreasing structure

Abstract

A de-multiplexing film component of multi-channel wavelength space type based on structure of two-ends thickness being decreased progressively is prepared as applying two materials with high refractive-index and low refractive-index separately to form complete said film component, setting film layer in high refractive-index and in low refractive-index alternatively with each other, making thickness of high refractive-index film layer decrease fixed value progressively from middle to two ends and setting optical thickness of low refractive-index film layer to be always as the same as that of high refractive-index film layer.

Description

technical field [0001] The invention relates to a multi-channel wavelength space demultiplexing thin film device based on a structure with decreasing thickness at both ends. Background technique [0002] With the rapid development of optical communication systems, there is an urgent need to double the communication capacity, and the Dense Wavelength Division Multiplexing (DWDM) optical transmission system undoubtedly meets the needs of improving communication capacity. It can load and transmit at ultra-high speed and large capacity information. After the 1990s, DWDM technology became practical rapidly, and became the leading technology in the future broadband optical network because of its lower cost and simpler structure. The optical demultiplexer is one of the most critical devices in DWDM technology. The most widely used wavelength multiplexer in engineering is the dielectric film filter multiplexer. This is because the dielectric film has low insertion loss and polariza...

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Problems solved by technology

However, most of the dielectric film multiplexing devices currently used are to double the thickness of the film in exchange for a large dispersion effect, which is difficult to prepare, and most of them are only suitable for a very narrow frequency band, while the separation or multiplexing of multiple wavelengths can be used Multiple dielectric films are combined with multiple devices to achieve multi-channel dispersion and light splitting effects.

In addition, in some special optical detection or spectral analysis applications, it is necessary to distinguish several wavelengths of light that are closely spaced in the incident beam. At this time, only grating devices can be used, but grating devices require a large space, which is not conducive to Integrated

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