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Method for optical interleaving antisymmetric filtering and antisymmetric optical interleaving comb filter

A comb filter, asymmetric technology, applied in the direction of coupling of optical waveguides, can solve the problems of asymmetry, can not meet the bandwidth of the output channel of the channel add-drop device, etc., to achieve the effect of simple structure

Inactive Publication Date: 2009-04-15
广州南沙慧视通讯科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The technical solution provided by this patent has improved the tolerance of the DWDM system to the optical carrier wavelength offset channel center wavelength, and is easy to implement, but it still cannot meet the asymmetrical requirements of the channel adder for the bandwidth of the output channel.

Method used

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  • Method for optical interleaving antisymmetric filtering and antisymmetric optical interleaving comb filter
  • Method for optical interleaving antisymmetric filtering and antisymmetric optical interleaving comb filter
  • Method for optical interleaving antisymmetric filtering and antisymmetric optical interleaving comb filter

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Effect test

Embodiment 1

[0043] Such as image 3As shown, at 30dB, the sum W of the first and second output channel bandwidths of the asymmetric optical interleaved comb filter is 1.6nm. Taking B=3, the bandwidth of the second output channel is 3 times of the bandwidth of the first output channel, so the bandwidth at 30dB of the first channel is D=(1.6 / 4)nm. After shifting the first output channel to the right by 1, 2, and 3 bandwidths D, 3 offset channels are obtained. Taking α=2.30, β=4.18, and roughly selecting the reflectivity R, the output intensity-wavelength relationship diagram of the three offset channels can be enveloped by the output intensity-wavelength relationship diagram of the second output channel. Then roughly adjust the first wave plate parameter α and the second wave plate parameter β to make the waveform tops of the two output channels smooth. Such as image 3 As shown, when R=0.46, α=2.32, and β=4.3 are selected, the waveforms of the three offset channels are enveloped in the ...

Embodiment 2

[0047] Such as Figure 8 As shown, at 30dB, the sum W of the bandwidth of the first and second output channels is still 1.6nm. Taking B=5, the bandwidth of the second output channel is 5 times of the bandwidth of the first output channel, so the bandwidth at 30dB of the first channel is D=(1.6 / 6)nm. Same as in Embodiment 1, after shifting the first output channel to the right by 1, 2, 3, 4, 5 bandwidths D, 5 shifted channels are obtained. Draw the waveform diagrams of the 5 offset channels together with the waveform diagrams of the first and second output channels, such as Figure 8 shown. At this time, α is 2.22, β is 4.19, and the reflectivity R is roughly selected so that the waveforms of the five offset channels are enveloped by the waveform of the second output channel. Then roughly adjust the first wave plate parameter α and the second wave plate parameter β to make the top of the waveform smooth.

[0048] When B=5, the fine-tuning method of the asymmetric optical in...

Embodiment 3

[0050] Such as Figure 9 As shown, similar to Embodiments 1 and 2, taking B=7, the bandwidth of the second output channel is 7 times the bandwidth of the first output channel, and the bandwidth at 30 dB of the first channel is D=(1.6 / 8)nm. After shifting the first output channel to the right by 1, 2, 3, 4, 5, 6, and 7 bandwidths D, 7 offset channels are obtained. α is 2.14, β is 6.16, roughly select R so that the waveform envelope of the 7 offset channels is in the second output channel, and roughly adjust α and β to make the top of the waveform smooth.

[0051] When B=7, the fine-tuning method of the asymmetric optical interleaved comb filter is the same as that in Embodiment 1, so it will not be described again. The ideal parameter range for the two output channel waveforms is: R is 0.66-0.70, α is 2.13-2.17, and β is 6.13-6.17; the most ideal parameter value of the waveform is: R is 0.68, α is 2.15, β Take 6.15, such as Figure 10 shown.

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Abstract

This invention discloses one optical cross asymmetric filter wave method based on G-T standard tool and bias interference meter, which comprises the following steps: a, determining output channel width proportion; b, using math simulation software to draw relationship between output intensity to wave length; c, taking alpha for 2.00-3.00 and beta for 4.00-6.50 and roughly selecting reflection rate R value to make the second output channel wave width as first output channel width B times; b, keeping R constant with roughly adjust parameter for alpha, beta to slide the two channels; C, micro adjusting the values to optimize two channel wave parameters, edge steepness.

Description

technical field [0001] The invention relates to the technical field of wavelength division multiplexing (WDM), in particular to an optical interleaved asymmetric filtering method and an asymmetric optical interleaved comb filter. Background technique [0002] In optical fiber communication, optical channels need to be multiplexed at the sending end to improve channel utilization; while at the network node to perform drop or add calls, the optical channels must first be demultiplexed and the downlink calls The optical channel where the channel is located is separated from a series of optical wavelengths in the input fiber, and the optical channel where the upstream channel is located is inserted into the optical fiber to form a new series of light waves, which continue to be transmitted to the next node. Optical thin films are the most popular devices to achieve this goal, however, narrowband thin film filters are technically difficult to realize. In order to meet the narrow...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/34
Inventor 伍树东
Owner 广州南沙慧视通讯科技有限公司
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