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Electrooptical variable optical attenuator

A technology of optical attenuator and attenuator, which is applied in the direction of instruments, optics, optical components, etc., can solve problems such as poor stability, and achieve the effects of eliminating natural birefringence, low polarization mode dispersion, and low polarization correlation

Inactive Publication Date: 2012-11-07
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problem of poor stability caused by the influence of natural birefringence in the transverse modulation of the electro-optic variable optical attenuator in the prior art, the purpose of the present invention is to provide an electro-optic variable optical attenuator, which can eliminate electro-optic crystals, polarization Influence of natural birefringence in beam splitters and recombiners

Method used

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  • Electrooptical variable optical attenuator
  • Electrooptical variable optical attenuator
  • Electrooptical variable optical attenuator

Examples

Experimental program
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Effect test

Embodiment 1

[0037] See figure 1The shown transmissive normally open electro-optic variable optical attenuator includes a 1 / 2 wave plate 101, and electro-optic crystals 102 are symmetrically arranged on both sides of the 1 / 2 wave plate 101, and the upper and lower surfaces of the electro-optic crystal 102 are equipped with metal Electrode 103, the surface of metal electrode 103 is perpendicular to the c-axis of electro-optic crystal 102 (being the optical axis of electro-optic crystal), wherein the outside of one electro-optic crystal 102 is provided with polarizing beam splitter 104, and the outside of another electro-optic crystal 102 is provided with The recombiner 105, the recombiner 105 and the polarization beam splitter 104 are two identical birefringent crystals, and the optical axis placement direction of the recombiner 105 is the same as that of the polarization beam splitter 104, and the birefringent crystal can be Yttrium vanadate and other materials with large natural birefring...

Embodiment 2

[0039] See image 3 The shown transmissive normally-off electro-optic variable optical attenuator includes a 1 / 2 wave plate 201, an electro-optic crystal 202, a metal electrode 203, a polarization beam splitter 204, a recombiner 205, a fiber collimator 206, and an electrical signal modulator 207, its structure and working principle are basically the same as in Embodiment 1, but in order to realize the transmissive normally-off variable optical attenuator, a 1 / 2 wave plate is also arranged between the recombiner 205 and its adjacent electro-optic crystal 202 201, which can ensure that the light intensity of the rear optical path is zero at zero voltage, so as to protect the subsequent optical devices, and its polarization state changes as Figure 4 shown.

Embodiment 3

[0041] See Figure 5 The reflective normally open electro-optic variable optical attenuator shown includes the upper half and the lower half of the variable optical attenuator, and the upper half of the variable optical attenuator is provided with a fiber collimator 306 and a polarization beam splitter 304 in sequence , electro-optic crystal 302 and 1 / 4 wave plate 301, the lower half of the variable optical attenuator and the upper half of the variable optical attenuator are symmetrically provided with fiber collimator 306, recombiner 305, electro-optic crystal 302 and 1 / 4 wave plate The sheet 301, the fiber collimator 306 arranged in the upper part of the variable optical attenuator and the fiber collimator 306 arranged in the lower part of the variable optical attenuator can be replaced by a double fiber collimator. The polarizing beam splitter 304 and the recombiner 305 can be made of the same piece of material, or two pieces of the same material, and these materials can be...

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Abstract

The invention discloses an electrooptical variable optical attenuator, comprising a 1 / 2 wave plate or 1 / 4 wave plates, electrooptical crystals, a polarization beam splitter, a combiner and an optical fiber collimator, wherein any polarization-incident light is divided into two light beams through the polarization beam splitter, and the two light beams have mutually-vertical polarization directions and different paths; the included angles between the polarization directions of the two light beams and a c axis of an electrooptical crystal are respectively (pi / 4+mpi); the polarization states of the two light beams rotate by 90 degrees in the same direction by adopting a structure of adding a 1 / 2 wave plate or two 1 / 4 wave plates between two same electrooptical crystals, namely mutual conversion is carried out after the polarization states of the two light beams pass through the wave plate(s), therefore, after passing through the polarization beam splitter, the combiner and the two electrooptical crystals, the optical path difference of the two light beams is zero, phase delay caused by natural birefraction of the polarization beam splitter, the combiner and the two electrooptical crystals can be offset, so that the influence of the natural birefraction is eliminated and the stability of the device is improved.

Description

technical field [0001] The invention relates to a variable optical attenuator in the field of optical fiber communication, in particular to an electro-optical variable optical attenuator. Background technique [0002] In optical fiber communication system, variable optical attenuator is one of the important passive devices, which can dynamically reduce or control optical signal. The array variable optical attenuator is the core component of the multi-channel optical power monitoring and equalizing device in the dense wavelength division multiplexing system. With the rapid increase of communication capacity, people need variable optical attenuators with fast response time, low insertion loss, small polarization correlation, good reliability and easy integration. (MEMS), and variable optical attenuators such as optical fiber displacement type are difficult to achieve a faster response time due to the mechanical movement involved, and also lack long-term stability. Other manu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/03G02F1/05G02B5/30G02B1/02
Inventor 罗豪甦林彦霆赵祥永李晓兵徐海清林迪王升狄文宁吴啸
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI