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One-dimensional membrane cavity structure-based different-bandwidth optical interleaver

A filter and film cavity technology, applied in optics, instruments, optical components, etc., can solve the problems of low yield and many layers of evaporated film, and achieve the effects of low production cost, flat filter characteristics, and high reliability

Inactive Publication Date: 2010-08-18
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This prior art has a large number of vapor-deposited films, so the yield is not high

Method used

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  • One-dimensional membrane cavity structure-based different-bandwidth optical interleaver
  • One-dimensional membrane cavity structure-based different-bandwidth optical interleaver
  • One-dimensional membrane cavity structure-based different-bandwidth optical interleaver

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Embodiment 1: as figure 1 As shown, when the optical interleave filter of the present invention has a frequency interval of 100 GHz and a duty ratio of 1:5, the light beam passes through the collimating lens 2, 11 optical medium layers 3, and the focusing lens sequentially from the input optical fiber 1 along the direction in which the light beam advances. 4. Output from the output optical fiber 5. The materials A, B, C, and D of each dielectric layer of the filter are respectively selected as magnesium fluoride, zinc sulfide, glass, and lead antimonide, and the refractive indices are 1.38, 2.35, 1.51, and 4.1, respectively. The optical thicknesses of media A, B and D are all 387.53 nm, and the optical thickness of media C is 1498.97 μm. Transmission spectrum such as figure 2 shown. It can be seen from the figure that both the passband and stopband of the filter have flat filtering characteristics, and each center frequency conforms to the ITU-T standard of the Inte...

Embodiment 2

[0029] Embodiment 2: as figure 1 As shown, when the optical interleave filter of the present invention has a frequency interval of 100 GHz and a duty ratio of 1:3 and 1:4, the light beam passes through the collimating lens 2 and the 11-layer optical medium successively from the input optical fiber 1 along the direction of the light beam advance. Layer 3, focusing lens 4, output from output optical fiber 5. When the refractive indices of the medium layers A, B, C and D of the filter are 1.45, 1.99, 1.56 and 3.23 respectively, a spectral transmittance spectrum with a duty ratio of 1:3 is obtained. When the refractive indices of the dielectric layers A, B, C and D are 1.45, 2.35, 1.57 and 4.1 respectively, a spectral transmittance spectrum with a duty ratio of 1:4 is obtained. The optical thicknesses of media A, B and D are all 387.53 nm, and the optical thickness of media C is 1498.97 μm. Transmission spectrum such as Figure 4 shown. It can be seen that the pass-stop band cha...

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Abstract

The invention discloses a one-dimensional membrane cavity structure-based different-bandwidth optical interleaver. The interleaver comprises an input optical fiber, a collimating lens, eleven optical dielectric layers, a focusing lens and an output optical fiber and is characterized in that: along the forward direction of a light beam, the eleven optical dielectric layers orderly comprise: a first layer and an eleventh layer of B-type dielectric layers, a second layer and a tenth layer of C-type dielectric layers, a third layer and a ninth layer of the B-type dielectric layers, a fourth layer and an eighth layer of A-type dielectric layers, a fifth layer and a seventh layer of D-type dielectric layers and a sixth layer of a C-type dielectric layer; the C dielectric layers are isotropical optical glass; the A, B and D dielectric layers are optical thin films with different refractive indexes; the optical thicknesses of the A, B and D dielectric layers are all 1 / 4 of a central wavelength; and the expression of the optical thickness of the C dielectric layer is C / (2*delta f). The interleaver has the characteristics of low cost, high performance and high reliability; and both a pass band and a stop band have flat filter characteristics, so the interleaver is used for performing the selection of wavelength signals, noise filter of an optical amplifier, gain equalization and the like in a wave division multiplex communication system.

Description

Technical field: [0001] The present invention relates to an optical interleaving filter of unequal bandwidth with flat passband and stopband characteristics, which is mainly used in wavelength division multiplexing communication systems for wavelength signal selection, noise filtering of optical amplifiers, gain equalization, etc. . Background technique: [0002] An optical filter is an instrument used for wavelength selection. It can select the desired wavelength from many wavelengths, and light other than this wavelength will be rejected. It can be applied to dense wavelength division multiplexing (DWDM) systems for wavelength selection, noise filtering of optical amplifiers, gain equalization, optical multiplexing / demultiplexing, etc. At this stage, with the continuous development of DWDM technology, the signal interval is getting smaller and smaller, which puts forward higher spectral resolution requirements for optical filters, and requires the use of narrower frequenc...

Claims

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Application Information

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IPC IPC(8): G02B6/26G02B1/10
Inventor 张娟于帅
Owner SHANGHAI UNIV
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