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Narrowband optical notch filter

A notch filter and optical technology, which is applied in the field of optical communication and microwave photonics, can solve the problems of large 3dB bandwidth and small isolation of notch filter, and achieve the effect of narrow 3dB bandwidth and high isolation

Active Publication Date: 2017-06-27
HUAZHONG UNIV OF SCI & TECH
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  • Claims
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Problems solved by technology

[0005] For the defects of the prior art, the object of the present invention is to provide a narrow-band optical notch filter, which aims to solve the problem that the existing notch filter based on the SBS loss spectrum has a relatively small isolation and a large 3dB bandwidth

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Embodiment Construction

[0020] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0021] figure 1 The structural representation of the narrow-band optical notch filter proposed by the present invention includes the following structures: a light source module 1, an optical coupler 2, a first SBS filter module 3, an optical power adjustment module 4 and a second SBS filter module 5; a light source module The output end of 1 is connected with the input end of optical coupler 2; Two output ends of optical coupler 2 are respectively connected with an input end of the first SBS filter module 3 and the second SBS filter module 5 respectively; The first SBS filter module 3 The output e...

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Abstract

The invention discloses a narrowband optical notch filter comprising a light source module, an optical coupler, a first SBS filter module, an optical power adjustment module and a second SBS filter module. The light source module generates pump light. The optical coupler divides the pump light into two beams which are used as the pump light of the two filter modules respectively. The first SBS filter module carries out notch filtering on signal light to generate an intermediate signal. The optical power adjustment module adjusts the optical power of the intermediate signal. The second SBS filter is used for performing notch filtering on the intermediate signal again to output the signal light. The narrowband optical notch filter realizes the secondary filtering of the signal light so that a SBS notch filter with higher isolation and narrower 3dB bandwidth is obtained.

Description

technical field [0001] The invention relates to the fields of optical communication and microwave photonics, and more particularly relates to a narrow-band optical notch filter. Background technique [0002] The notch filter is a special band-stop filter (very narrow stop band), which is mainly used to filter out unnecessary high-amplitude interference signals in the system, so it can effectively eliminate the impact of noise. In particular, in the optical processing of Orthogonal Frequency Division Multiplexing (OFDM) and microwave signals, due to the narrow channel spacing and large spectral range, the crosstalk between adjacent channels requires a narrow bandwidth and free spectral range (FSR) Larger optical filters to filter out noise. [0003] Although the traditional periodic notch filter has reached a high level in some indicators, due to the periodicity of the filter response, there is a restrictive relationship between its FSR and the 3dB bandwidth, so that the tra...

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Application Information

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IPC IPC(8): G02B6/293
CPCG02B6/29338
Inventor 柯昌剑钟一博陈雄超李伟昊郭臻王昊宇刘德明
Owner HUAZHONG UNIV OF SCI & TECH
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