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Intelligent film filter

A filter device and intelligent technology, applied in wavelength division multiplexing systems, optics, instruments, etc., can solve the problems of unfavorable cost control of systems and system manufacturers, inability to be reused, and increased production costs, etc., to achieve film thickness control The effect of reducing requirements, improving production efficiency and yield, and reducing waste

Inactive Publication Date: 2003-05-14
HONG FU JIN PRECISION IND (SHENZHEN) CO LTD +1
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Problems solved by technology

Thus, once the incident light angle θ changes, the central passband wavelength λ of the film filter 1 also moves accordingly, thereby extending the bandwidth of the corresponding central wavelength λ and limiting the number of channels that can be transmitted by a single single-mode optical fiber; in addition , because the central wavelength of the passband is also related to the thickness d of the spacer layer, the thin-film filter 1 has extremely high requirements on coating technology and coating materials, and a slight deviation may result in defective products, resulting in increased production costs
In addition, when the required passband band is changed, this kind of thin film filter becomes a waste product and cannot be reused, which is extremely unfavorable to the cost control of various systems and system manufacturers

Method used

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Embodiment Construction

[0014] see figure 2 , is an enlarged structure diagram of the thin film filter layer 2 of the first embodiment of the intelligent thin film filter device of the present invention, which is composed of a multilayer reflective film 20 and a glass substrate 28, and the multilayer reflective film 20 includes an intermediate spacer layer 26 and two Side reflective film system 22,24. The reflective film systems 22 and 24 on both sides are alternately composed of higher refractive index n H with lower refractive index n L Two kinds of dielectric materials are superimposed, and the number of film layers can be as many as dozens of layers. The optical thickness of each alternate film layer is the preset passband center wavelength λ 0 1 / 4 times of , and its film layers adjacent to the glass substrate 28, the intermediate spacer layer 26 and the external air all have a higher refractive index n H dielectric film. The intermediate spacer layer 26 includes a space hollow layer 263 and...

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Abstract

The intelligent film filter includes a multi-layer film filter and a electric controller. The multi-layer film filter has Fabry-Perot Etalon structure and consists of one middle interval layer and multi-layer high-reflectivity films on two sides, one side is one H(LH)p-1 film system and the other is one (HL)p-1H film system, and the middle interval layer includes one dielectric film layer in the thickness of one half transmissive wavelength. The dielectric film layer is made of piezoelectric material or other thickness controllable optical material. The electric controller is used to receive and analyze the outgoing light signal and to control the optical thickness of the middle interval layer autoamtically and lock and the filter in the preset central transmissive wavelength.

Description

【Technical field】 [0001] The present invention relates to an intelligent optical thin-film filter device, in particular to an intelligent thin-film filter device that can automatically adjust the central wavelength of the passband. 【Background technique】 [0002] With the continuous improvement of users' demands for various services such as e-commerce and online conferencing, the improvement of single-mode fiber transmission capacity has also been continuously proposed and requested. The dense wavelength division multiplexing system is an extremely effective way to increase optical fiber transmission. capacity method. In the wavelength division multiplexing system, multiple signals of different wavelengths are coupled into the same single-mode optical fiber for transmission through the wavelength division multiplexer. Optical demultiplexing to different channels. Generally, thin-film filter devices are often used in demultiplexing equipment to select specific wavelength si...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/01H04J14/02
Inventor 徐绍中
Owner HONG FU JIN PRECISION IND (SHENZHEN) CO LTD
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