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Adjustable film filter

A thin-film filter and adjustable technology, applied in the direction of instrument, optical waveguide coupling, wavelength division multiplexing system, etc., can solve the problem of single transmission, etc., and achieve the effect of simplifying the system, reducing the quantity and reducing the volume

Inactive Publication Date: 2004-09-29
HONG FU JIN PRECISION IND (SHENZHEN) CO LTD +1
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AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem that the optical filter in the prior art can only transmit incident light with a single fixed central wavelength, the first purpose of the present invention is to provide an adjustable thin-film filter that can adjust the predetermined central wavelength

Method used

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Embodiment Construction

[0015] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0016] see figure 1 , the tunable thin-film filter 30 provided by the present invention includes a thin-film waveguide 10 and a circular ring 308 surrounding the thin-film waveguide 10 .

[0017] Please also see figure 2 , the thin film waveguide 10 includes a substrate 102 and multi-layer thin films 104 formed on the substrate. The substrate 102 is composed of a glass substrate. The multi-layer film 104 is formed by alternately overlapping high refractive index layers 106 and low refractive index layers 108 . Most thin film materials used in optics are inorganic materials, usually made of metals, metal oxides (titanium dioxide, zirconium dioxide, etc.) and metal nitrides (silicon nitride, aluminum nitride, boron nitride, etc.). Other thin film materials include carbides (silicon carbide, germanium carbide, etc.), fluorides, mixtures of metal oxides, or mixtures...

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Abstract

The present invention relates to optical filter, and is especially one kind adjustable multilayer film filter for long distance communication. The adjustable film filter includes one film waveguide and one peripheral unit around the film waveguide. Compressing or stretching the peripheral unit to apply some force onto the film waveguide can regulate the central wavelength of the adjustable film filter. The present invention also provides one kind of optical system with the adjustable film filter. The present invention solves the problem that the optical filter can transmit incident light one fixed central wavelength only.

Description

【Technical field】 [0001] The invention relates to an optical filter, in particular to an adjustable multilayer film filter used in the field of remote communication. 【Background technique】 [0002] Traditional thin-film filters generally include a multi-layer thin film, which is usually formed on a glass substrate by evaporation of non-metallic materials with different refractive indices. Among them, each thin layer has a specific thickness and refractive index, and the interference phenomenon generated by the propagation of light in the multilayer film is used to form an optical filter that can selectively transmit incident light of a specific wavelength. However, this kind of thin-film filter can only transmit incident light with a certain fixed central wavelength. That is, its center wavelength is not adjustable. [0003] Dense Wavelength Division Multiplexer (DWDM) is a key technology required to increase the capacity of communication systems. In a DWDM system using t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/32G02B6/34
CPCG02B6/29361G02B6/327G02B6/29395
Inventor 陈杰良吕昌岳
Owner HONG FU JIN PRECISION IND (SHENZHEN) CO LTD
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