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Miniature narrow-band filter for multistage filtering

A narrow-band filter and narrow-band filtering technology, applied in the direction of instruments, light guides, optics, etc., can solve problems such as limiting the application range of narrow-band filters, achieve narrow line width, good reliability and stability, and achieve tuning effects

Pending Publication Date: 2020-02-04
UNIV OF SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the periodic comb filtering characteristics of the FP cavity limit the application range of the narrow-band filter based on the FP cavity, and propose a multi-stage filtering miniature narrow-band filter to realize the optical signal of a large spectral range Filter while improving filter performance, integration, reliability and stability

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  • Miniature narrow-band filter for multistage filtering
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  • Miniature narrow-band filter for multistage filtering

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Embodiment Construction

[0027] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0028] Figure 4 It is a structural schematic diagram of a miniature narrowband filter for multi-stage filtering in an embodiment of the present invention, and the miniature narrowband filter includes: an input collimator 51, a primary filter 3, an FP cavity 2 and an output collimator 52, wherein:

[0029] The input collimator 51 is used to transmit the input optical signal to the primary filter 3 through free space after beam expansion;

[0030] The primary filter 3 is used to transmit the optical signal transmitted from the input collimator 51 to the FP cavity 2 through free space after primary filtering;

[0031] The FP cavity 2 is used for narrow-band filtering the optical signal filtered by the primary filter 3 and ...

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Abstract

The invention discloses a miniature narrow-band filter for multistage filtering, comprising an input collimator, a first-stage filter, an FP (Fabry-Perot) cavity and an output collimator, wherein theinput collimator is used for performing beam expansion on an input optical signal and then transmitting the optical signal into the first-stage filter through a free space; the first-stage filter is used for performing first-stage filtering on the optical signal transmitted by the input collimator and then transmitting the optical signal into the FP cavity through the free space; the FP cavity isused for performing narrow-band filtering on the optical signal filtered by the first-stage filter and then transmitting the optical signal to the output collimator through the free space; and the output collimator is used for receiving the optical signal which is transmitted by the FP cavity after being subjected to narrow-band filtering, and performing coupling and output on the optical signal.According to the miniature narrow-band filter of the invention, the first-stage filter is combined with the FP cavity, so that an application bottleneck of evenly spaced comb-shaped waveforms of an FPcavity filter can be solved, and narrow-band filtering in a large spectral range can be achieved; at the same time, control on a working temperature is achieved based on a thermistor and a semiconductor cooler TEC, thereby improving reliability of the filter.

Description

technical field [0001] The invention relates to the field of optical filtering, in particular to a miniature narrow-band filter for multi-stage filtering. Background technique [0002] Fabry-Perot cavity (Fabry-Perot, FP) filter is one of the important devices in the fields of modern optical fiber communication and optical fiber sensing. The FP cavity is generally composed of a glass plate coated with a high-reflection film on the inner surface and an anti-reflective film on the outer surface. When the wavelength of the incident light wave is an integer multiple of the cavity length, the light wave can form a stable oscillation, and multiple beams will be generated between the output light waves. Interference, and finally output comb waveforms with equal intervals. Compared with other filters based on atomic filters, coherent filters, and grating filters, FP cavity filters can realize the advantages of wide working filter section, tunable center wavelength, narrow filter li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/293
CPCG02B6/29359
Inventor 李杨廖胜凯徐凭印娟任继刚彭承志潘建伟
Owner UNIV OF SCI & TECH OF CHINA
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