Polarization independent tunable optical filter based on quasi-phase matching crystal

A quasi-phase matching, optical filter technology, applied in the direction of instruments, optics, nonlinear optics, etc.

Inactive Publication Date: 2011-08-10
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The tunable filter based on this quasi-phase matching has the advantages of transmission spectrum filtering, narrow bandwidth, and large tuning range. However, since this filter is based on polarization filtering, its polarization-dependent loss has become an inevitable defect. Seriously affects the filtering efficiency

Method used

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  • Polarization independent tunable optical filter based on quasi-phase matching crystal
  • Polarization independent tunable optical filter based on quasi-phase matching crystal
  • Polarization independent tunable optical filter based on quasi-phase matching crystal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] see figure 1 , a polarization-independent tunable optical filter based on a quasi-phase-matched crystal, including a light source (1), a spectrometer (2), an optical circulator (3), a polarization controller (4), and a polarization splitter / combiner (5 ), a quasi-phase matching crystal (8), a first polarizer (7) and a second polarizer (9), the input port of the optical circulator (3) is connected to the light source (1), and one output port is connected to the spectrometer (2), It is characterized in that the other output port of the optical circulator (3) is connected with a polarization controller (4), the polarization controller (4) is connected with a polarization splitter / combiner (5), and the polarization One output arm of the beam splitter / combiner (5) is sequentially connected with the first fiber collimator (6), the first polarizer (7), the quasi-phase matching crystal (8), the second polarizer (9), The second fiber collimator (10) is connected with the other...

Embodiment 2

[0028] This embodiment is basically the same as Embodiment 1, and the special features are as follows:

[0029] The input and output of the optical circulator (3) are both non-polarized light.

[0030] The output light wavelength of the optical circulator (3) realizes wavelength tuning by changing the temperature of the quasi-phase matching crystal (8).

[0031] The polarization directions of the two output ends of the polarization splitter / combiner (5) are respectively parallel to the polarization directions of the first polarizer (7) and the second polarizer (9).

[0032] This embodiment further describes the present invention through verification tests with reference to the accompanying drawings and taking the traditional single-channel structure Solc as a comparison.

[0033] see figure 1 , the unpolarized light emitted by the light source (1) enters the optical circulator (3), passes through the polarization controller (4) and enters the polarization splitter / combiner ...

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Abstract

The invention relates to a polarization independent tunable optical filter based on a quasi-phase matching crystal. The optical filter comprises a light source, a spectrometer, an optical circulator, a polarization controller, a polarization beam splitter / combiner, the quasi-phase matching crystal, a first polarizer, a second polarizer, a first fiber collimator and a second fiber collimator, wherein an input port of the optical circulator is connected with the light source; an output port of the optical circulator is connected with the spectrometer; the other output port of the optical circulator is connected with the polarization controller; the polarization controller is connected with the polarization beam splitter / combiner; an output arm of the polarization beam splitter / combiner is sequentially connected with the first fiber collimator, the first polarizer, the quasi-phase matching crystal, the second polarizer, the second fiber collimator and the other output arm of the polarization beam splitter / combiner to form an optical loop; and the polarization directions of the first polarizer and the second polarizer are mutually vertical. The optical filter has a simple structure, reduces related loss of polarization, can obviously increase utilization rate of filtering energy and improves output power.

Description

technical field [0001] The invention belongs to the field of optical fiber communication, and in particular relates to a polarization-independent tunable optical filter based on a quasi-phase matching crystal. Background technique [0002] Optical fiber communication technology has the characteristics of broadband, high speed, large capacity and strong confidentiality, and has been widely used in various communication systems. Ultra-narrowband, wide-range tunable optical filters play an increasingly important role in WDM (wavelength division multiplexing), lasers and other optical devices. Such optical filters mainly include folded Solc (Sock) filters, fiber grating filters, and traditional single-channel Solc filters based on quasi-phase-matched crystals. [0003] The traditional folded Solc filter has the advantages of narrow bandwidth and adjustable transmittance, but its complex structure and non-tunable wavelength limit its application in practical applications. In re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/01
Inventor 曾祥龙张倩武贺超付兴虎文建湘庞拂飞王廷云
Owner SHANGHAI UNIV
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