CN103424894B - polarization independent electro-optic intensity modulator - Google Patents
polarization independent electro-optic intensity modulator Download PDFInfo
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- CN103424894B CN103424894B CN201310382160.2A CN201310382160A CN103424894B CN 103424894 B CN103424894 B CN 103424894B CN 201310382160 A CN201310382160 A CN 201310382160A CN 103424894 B CN103424894 B CN 103424894B
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- reflecting mirror
- electro
- completely reflecting
- beam splitter
- wave plate
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/21—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour by interference
- G02F1/211—Sagnac type
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F2203/00—Function characteristic
- G02F2203/06—Polarisation independent
Abstract
A kind of polarization independent electro-optic intensity modulator, it forms and comprises beam splitter, the second half-wave plate, the first completely reflecting mirror, the birefringence electro-optic ceramics of gold-plated pole, top and bottom, the second completely reflecting mirror, the 3rd half-wave plate, the 3rd completely reflecting mirror and adjustable height potential source, and described beam splitter is 1:1 beam splitter.The present invention has the advantages that polarization has nothing to do, stability is strong and modulation range is wide, can be applicable to the feature of high power system.
Description
Technical field
The present invention relates to optoelectronic device, the electro-optic intensity modulator that particularly a kind of polarization is irrelevant.
Background technology
Electrooptic modulator uses the electrooptical effect of non-linear electro-optic material to the device of the amplitude of light beam, phase place, frequency and polarization direction etc.Lithium niobate fiber waveguide electrooptic modulator obtains important and widespread use at fiber optic communication field in recent years.Different from directly modulated laser, lithium niobate zero to be warbled or negative chirped modulation with it, can reduce the dispersive influence in optical fiber communication to greatest extent, thus good with optical fiber compatibility, can be applicable to high speed optical communication.But the shortcomings such as the electrooptical coefficient of lithium niobate is little, and laser damage threshold is low, cannot meet the requirement in high power laser system.And optical fiber clear aperature is little, be difficult to the demand meeting heavy caliber high power electro-optical device.
Optical ceramics is the one in transparent electro-optic ceramics material, its crystal structure and Perovskite Phase are together, be widely used in the new inorganic material of production equipment, medical treatment, military affairs, laser and electron trade, they are good piezoelectric energy-conversion material, ferroelectric material, electrooptical material, nonlinear optical material and surface wave host material etc., can also play optical modulation effect in optical communications.Optical ceramics kind is more, as PMN-PT (hereinafter referred to as PMNT) crystalline ceramics has ins and outs, in recent years, the advantage of PMNT electro-optical properties finds out gradually, have that electrooptical coefficient high (being at room temperature about 100 times of lithium columbate crystal), optical ribbon are roomy, low-loss, low ferroelectric hysteresis loop characteristic and fast corresponding speed, can large scale growth and the high (>GW/cm of laser damage threshold
2) etc. advantage, at high power light electron device as having very large potentiality in laser radar, laser weapon etc.In the pre-place system in front end of high power laser system, Polarization Controller used is manual Polarization Controller, the change of adjustment polarization state that can not be real-time, and in general amplitude modulaor, include polarizing component, the change of polarization state will inevitably cause the change of output pulse amplitude, and influential system exports the stability of energy.Therefore the have nothing to do research of electrooptic modulator of the polarization of space structure is significant.
Summary of the invention
The problem that the present invention is correlated with in order to the polarization solved in high power electro-optical device Modulation and Amplitude Modulation, a kind of polarization is provided to have nothing to do electrooptic modulator, this electrooptic modulator has the advantages that polarization has nothing to do, stability is strong and modulation range is wide, can be applicable to the feature of high power system.
Technical solution of the present invention is as follows:
A kind of polarization independent electro-optic intensity modulator, feature is that it is formed and comprises beam splitter, the second half-wave plate, the first completely reflecting mirror, the birefringence electro-optic ceramics of gold-plated pole, top and bottom, the second completely reflecting mirror, the 3rd half-wave plate, the 3rd completely reflecting mirror and adjustable height potential source, and the position relationship of above-mentioned component is as follows:
The birefringence electro-optic ceramics of beam splitter successively, the second half-wave plate, the first completely reflecting mirror, gold-plated pole, the second completely reflecting mirror, the 3rd half-wave plate, the 3rd completely reflecting mirror and beam splitter form sagnac ring; Reflection angle in light path and incident angle are 45 °, and described adjustable height potential source is connected with the golden pole of the upper and lower surface of described birefringence electro-optic ceramics.
Described birefringence electro-optic ceramics by cubic crystal structure PMN-PT, lead lanthanum zirconate titanate or mix lanthanum PMN-PT and make.
Ultimate principle of the present invention is as follows:
If the electric field intensity p of incident light is in x-y plane, direction of beam propagation is z-axis.With Jones matrix, beam propagation process is described.If incoming polarization state is complete linearly polarized light, Jones matrix is written as
Wherein θ is polarization direction and x-axis angular separation.The matrix of the second half-wave plate and the 3rd half-wave plate can be written as
With
Beam splitter and catoptron can produce the SPA sudden phase anomalies of π when reflecting light, namely reflection matrix is
Beam splitter be transmitted as unit matrix.Birefringent phase delayer regarded as by electrooptic birefringence crystalline ceramics, direction of an electric field be x-axis to, then its Jones matrix is written as:
Wherein,
it is the phase differential that clockwise and counterclockwise light is caused by PMNT pottery secondary electrooptic birefringence effect.If beam splitter all has the splitting ratio of 1:1 to the incident light under each polarization state, calculate clockwise and counterclockwise propogator matrix respectively, can obtain its output light field amplitude is:
The output intensity that is then concerned with at beam splitter place is:
Visible, sagnac ring output intensity only with phase differential
relevant, wherein L is electro-optic ceramics thickness, and E is the impressed voltage of electro-optic ceramics.Output intensity and the incident light polarization orientation angle θ of this modulator have nothing to do, and this is the unique distinction of this structure.
Consider that General Elliptic polarized light is on the impact of modulator.
The Jones matrix of elliptically polarized light is
j in formula (2) and (3) is replaced by this formula
p, the Output rusults calculating modulator is still:
Therefore no matter be line polarisation or elliptically polarized light, on modulator all without impact, really stably reach the characteristic of the unglazed spatial modulator of polarization.
The features and advantages of the invention are:
(1) the present invention adopts sagnac ring structure, and external environment is identical with the effect of counterclockwise light field to clockwise light field, and therefore output performance is stablized.
(2) the present invention may be used among high-power component.Birefringence electro-optic ceramics selects there is the material of cubic crystal structure as PMNT, PLZT, PLMNT etc.
(3) modulator of the present invention and incident beam polarization have nothing to do.
(4) modulation range is wide, LiNbO general at present
3modulator intensity modulated scope is about 0dB-20dB, and light intensity modulation scope of the present invention is 0dB ~ 23dB.
Accompanying drawing explanation
Fig. 1 is that polarization of the present invention has nothing to do the structural representation of electrooptic modulator
Embodiment
Below in conjunction with embodiment and accompanying drawing, the invention will be further described, but should not limit the scope of the invention with this.
Refer to Fig. 1, Fig. 1 is that polarization of the present invention has nothing to do the structural representation of electrooptic modulator, as seen from the figure, polarization of the present invention has nothing to do electrooptic modulator, comprise beam splitter 1, first half-wave plate 2, first completely reflecting mirror 3, electro-optic ceramics birefringent material 4, second completely reflecting mirror 5, second half-wave plate 6 of gold-plated pole, the 3rd completely reflecting mirror 7 and adjustable height potential source 8, the position relationship of above-mentioned component is as follows:
Described beam splitter 1, second half-wave plate 2, first completely reflecting mirror 3, electro-optic ceramics birefringent material 4, second completely reflecting mirror 5 of gold-plated pole, the 3rd half-wave plate 6, the 3rd completely reflecting mirror 7 form sagnac ring;
The polarization direction of the linearly polarized light that laser instrument sends is through entering the beam splitter 1 of sagnac ring, through beam splitting transmitted light beam and the folded light beam of described beam splitter 1, described transmitted light beam is through the 3rd completely reflecting mirror 7, second half-wave plate 6, second completely reflecting mirror 5, birefringence electro-optic ceramics 4, first completely reflecting mirror 3, first half-wave plate 2 and beam splitter 1 transmission, and this is counterclockwise light path;
Folded light beam through described beam splitter 1 reflects through the first described half-wave plate 2, first completely reflecting mirror 3, birefringence electro-optic ceramics 4, second completely reflecting mirror 5, second half-wave plate 6, the 3rd completely reflecting mirror 7 and beam splitter 1 successively, and this is clockwise light path;
Reflection angle in described light path and incident angle are 45 °, and described adjustable height potential source 8 is connected with the golden pole of the upper and lower surface of described birefringence electro-optic ceramics 4.By the impressed voltage regulating adjustable height potential source 8 to change birefringence electro-optic ceramics 4.
The whole framework of the present invention is by beam splitter, and completely reflecting mirror, half-wave plate, birefringence electro-optic ceramics, corresponding required adjustable high voltage power supply forms.Material requirements upper and lower two ends plated electrode, the polishing of two opposite side end faces, can plated film according to material behavior.When building light path, first keep the polarization direction of incident light consistent with x-axis, regulate the first half-wave plate 2 to make direction of polarized light when inciding birefringence sample clockwise consistent with x-axis.Regulate the second half-wave plate 6, make direction of polarized light when inciding birefringence sample counterclockwise consistent with z-axis.Namely the major axes orientation of the first half-wave plate 2 and the second half-wave plate 6 differs 45 °.Keep clockwise with orthogonal by the polarization direction of the light beam of PMNT birefringent material counterclockwise.
After light path is put up, it is different angles that the polarization direction of change incident light is respectively with x-axis.Regulate the voltage of adjustable height potential source on gold-plated pole birefringence electro-optic ceramics 4, can record output intensity and change with impressed voltage, modulation range is about 23dB.
Claims (2)
1. a polarization independent electro-optic intensity modulator, be characterised in that its formation comprises beam splitter (1), second half-wave plate (2), first completely reflecting mirror (3), the birefringence electro-optic ceramics (4) of gold-plated pole, top and bottom, second completely reflecting mirror (5), 3rd half-wave plate (6), 3rd completely reflecting mirror (7) and adjustable height potential source (8), the position relationship of above-mentioned component is as follows: beam splitter (1) successively, second half-wave plate (2), first completely reflecting mirror (3), the birefringence electro-optic ceramics (4) of gold-plated pole, second completely reflecting mirror (5), 3rd half-wave plate (6), 3rd completely reflecting mirror (7) and beam splitter (1) form sagnac ring, reflection angle in light path and incident angle are 45 °, described adjustable height potential source (8) is connected with the golden pole of the upper and lower surface of described birefringence electro-optic ceramics (4), described birefringence electro-optic ceramics (4) by cubic crystal structure PMN-PT, lead lanthanum zirconate titanate or mix lanthanum PMN-PT and make.
2. polarization independent electro-optic intensity modulator according to claim 1, is characterised in that described beam splitter (1) is 1:1 beam splitter.
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| CN201310382160.2A CN103424894B (en) | 2013-08-28 | 2013-08-28 | polarization independent electro-optic intensity modulator |
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| CN201310382160.2A CN103424894B (en) | 2013-08-28 | 2013-08-28 | polarization independent electro-optic intensity modulator |
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| CN103424894B true CN103424894B (en) | 2015-10-28 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160337041A1 (en) * | 2015-05-15 | 2016-11-17 | Futurewei Technologies, Inc. | Polarization Independent Reflective Modulator |
| US10551640B2 (en) * | 2016-11-21 | 2020-02-04 | Futurewei Technologies, Inc. | Wavelength division multiplexed polarization independent reflective modulators |
| US10222676B2 (en) | 2017-01-27 | 2019-03-05 | Futurewei Technologies, Inc. | Polarization insensitive integrated optical modulator |
| US10330959B2 (en) | 2017-05-22 | 2019-06-25 | Futurewei Technologies, Inc. | Polarization insensitive micro ring modulator |
| US10243684B2 (en) | 2017-05-23 | 2019-03-26 | Futurewei Technologies, Inc. | Wavelength-division multiplexed polarization-insensitive transmissive modulator |
| CN108415143B (en) * | 2018-03-07 | 2021-06-04 | 中国人民解放军空军工程大学 | Polarization-independent reflection structure for satellite coherent optical communication and control algorithm thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1624510A (en) * | 2004-12-15 | 2005-06-08 | 中国科学院上海光学精密机械研究所 | Polarization unrelated high speed photo switch |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2001272638A (en) * | 2000-03-27 | 2001-10-05 | Fujikura Ltd | Variable light attenuator and variable light attenuator module |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1624510A (en) * | 2004-12-15 | 2005-06-08 | 中国科学院上海光学精密机械研究所 | Polarization unrelated high speed photo switch |
Non-Patent Citations (2)
| Title |
|---|
| Fiber Sagnac π-shifted interferometer for a polarization-independent PMNT high-speed electro-optic switch;Qing Ye, Lei Qiao and Jiulin Gan,et.al.;《Optics Letters》;20101215;第35卷(第24期);4187-4189 * |
| Optical characteristics of transparent PMNT ceramic and its application at high speed electro-optic switch;Lei Qiao, Qing Ye and Jiulin Gan,et.al.;《Optics Communications》;20110513;第284卷;3886-3890 * |
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