CN102981219A - Device and method for compensating color difference and temperature difference of wavelength selecting switch at same time - Google Patents
Device and method for compensating color difference and temperature difference of wavelength selecting switch at same time Download PDFInfo
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- CN102981219A CN102981219A CN2012105237669A CN201210523766A CN102981219A CN 102981219 A CN102981219 A CN 102981219A CN 2012105237669 A CN2012105237669 A CN 2012105237669A CN 201210523766 A CN201210523766 A CN 201210523766A CN 102981219 A CN102981219 A CN 102981219A
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Abstract
The invention discloses a device and a method for compensating color difference and temperature difference of a wavelength selecting switch at the same time, relating to the field of wavelength selecting switches. The device comprises an optical fiber collimator array for collimating an input light signal into parallel light, a refracting and diffracting hybrid lens assembly which comprises at least two refracting and diffracting hybrid lenses for refracting and diffracting the parallel light and expanding a light beam along different directions, a spectro-grating for dividing the light beam into single-channel light signals and converging the single-channel light signals to a switch chip through the corresponding refracting and diffracting hybrid lenses, and the switch chip for switching and converting the light and reflecting the switched light into the optical fiber collimator array along an opposite direction. By the device and the method, the color difference and the temperature difference of the WSS (wavelength selecting switch) are actively compensated; and due to hybrid use of refraction and diffraction, the material consumption is reduced and the size of the WSS is reduced.
Description
Technical field
The present invention relates to the wavelength-selective switches field, specifically is a kind of aberration of wavelength-selective switches, the apparatus and method that the temperature difference compensates simultaneously.
Background technology
WSS(Wavelength Selective Switch, wavelength-selective switches) subsystem technology be rapidly ROADM(Reconfigurable Optical Add and Drop Multiplexer of development in recent years, Reconfigurable Optical Add/drop Multiplexer).OXC(Optical cross-connect, light interleave interconnect equipment) and ROADM as WDM(Wavelength Division Multiplexing, wavelength-division multiplex) the core light switching equipment in the network, need and to dispose random wave progress row at arbitrary port, and be easy to realize the transmission capacity of Gbit/s even Tbit/s.And WSS has bandwidth, dispersion is low, has input wavelength from the function of any output port output, and the ROADM based on WSS, the channel of wavelength granularity can be provided in all directions, long-range reconfigurable all straight-through ports and upper and lower port are suitable for realizing that multidirectional interannular is interconnected and make up wireless mesh network, are the technology of new generation that realizes OXC and ROADM, adopt ROADM to carry out the multiplex/demultiplex system, be used in the different local of optical-fiber network.Corresponding WSS is distributed on a plurality of different nodes of optical-fiber network usually, so the working environment of WSS also is varied, and the prerequisite that jumbo WSS is widely used is wanted exactly and can be worked under various environment.
The variation of temperature is an important indicator of environment, and the curvature of optical element, thickness and interval all change during temperature variation, and the refractive index of the refractive index of element body material and place medium also will change.The refractive index temperature of lens its material in the infrared wavelength range of communication changes more obvious than visible light.In addition, in the light path design of wavelength-selective switches, aberration is also very large on the impact of its performance.All these needs the variation that our wavelength-selective switches can adaptive temperature, has again very little aberration.Therefore the design that simultaneously temperature difference and the aberration of WSS is compensated is extremely important.
Chinese patent CN102608712A discloses a kind of compensation method and device thereof of wavelength-selective switches medium wavelength drift, its method is to adopt the different rotating beam of hot stroke and compensation block combination, utilize rotating beam and compensation block under same external temperature condition, to produce different stretching, unitized construction is rotated, and then drive the rotation of WSS optical element, reach the compensation wave length shift.US Patent No. 8036502B2 discloses a kind of method, wave length shift to wavelength-selective switches on Design of Mechanical Structure and the assembly method compensates, this patent is carried out special design by the structure to optical backplane, and being equipped with corresponding snubber block and guaranteeing light path and MEMS(Micro-Electro-Mechanical Systems, MEMS (micro electro mechanical system)) aligned position of chip chamber is constant.In addition, photon journal 1999 vo1.28, No.5 " analysis of diffraction optical element thermal stability " has made a concrete analysis of the temperature characterisitic of refraction and diffraction optical element.And Acta Physica Sinica 2008 vol.57, No.10 " realizing apochromatic hyperthermy mixing infrared optical system " have carried out the poor design of heat that disappears of the apochromatic folding/hybrid optical system hyperthermy that spreads out.Compound lens carries out achromatism, the heat that disappears poor Patents and document yet rarely relevant utilization folding spreads out in the system of wavelength-selective switches.
In the design of wavelength-selective switches, no matter be initial passive mechanical compensation technology, still afterwards active thermal sensing compensation technique has that its very large weak point---mechanical type compensation technique volume is large, and the encapsulation of module acquires a certain degree of difficulty; Hot sensing compensation needs extra power supply, and the Circuits System reliability reduces.And having added these external compensation devices, the volume of wavelength-selective switches will inevitably increase greatly.This and market are to the miniaturization of optic communication device, and integrated requirement runs in the opposite direction, and is unfavorable for the development of WSS, and the folding of achromatism and the temperature difference Systems Theory of spreading out is not applied at WSS, also not discovery to the designs of its miniaturization.
Summary of the invention
For the defective that exists in the prior art, the object of the present invention is to provide a kind of aberration, temperature difference while compensation system and method for wavelength-selective switches, realize the temperature difference and the aberration of active compensation WSS, and mix use because folding spreads out, reduce the use of material, dwindled the volume of WSS.
For reaching above purpose, the invention provides a kind of aberration, temperature difference while compensation system of wavelength-selective switches, comprising: optical fibre collimator array is used for input optical signal is collimated into directional light; Spread out hybrid lens combination of folding comprises at least two foldings hybrid lens that spreads out, and all is used for will directional light reflecting, expands along different directions behind the diffraction; Spectro-grating is used for light beam is divided into single channel optical signal, and converges to switch chip through the corresponding folding hybrid lens that spreads out; Switch chip is used for cutting light and conversion, and the light after being switched is along reflexing in the optical fibre collimator array in the other direction.
On the basis of technique scheme, described each folding hybrid lens that spreads out includes refractor and diffraction lens.
On the basis of technique scheme, the spread out hybrid lens combination of described folding also comprises and is located at its outside housing.
On the basis of technique scheme, described switch chip is based on the wavelength-selective switches of light path and MEMS (micro electro mechanical system) principle, carries out the switching of light by the micromirror position of adjusting this wavelength-selective switches.
On the basis of technique scheme, described switch chip is the wavelength-selective switches based on the liquid crystal on silicon principle, carries out the switching of light by the liquid crystal phase place of adjusting this wavelength-selective switches.
On the basis of technique scheme, the spread out diffraction surfaces direction of hybrid lens of described each folding is consistent.
The present invention also provides a kind of aberration of wavelength-selective switches, the method that the temperature difference compensates simultaneously, comprises the steps: S1. in the wavelength-selective switches optical system, realizes
, i wherein, j is natural number, and i contains the label of the optical element of focal power for each, and j is all actual optical element summations that contain focal power, and Φ is the value of focal power; S2. according to the folding of the correspondence hybrid lens that spreads out, the focal power of each optical element is carried out summation with the ratio of corresponding Abbe number, and total value is zero, realizes the achromatism of whole wavelength-selective switches optical system; The image planes out of focus that whole wavelength-selective switches optical system itself is produced is consistent with expanding with heat and contract with cold of the housing of rolling over the hybrid lens combination outside of spreading out, according to formula
, l wherein, k gets natural number,
Be the linear expansion coefficient sum of described housing and switch chip, T is environment temperature.
On the basis of technique scheme, achromatism among the described S2, the refractor and the diffraction lens that require each folding to spread out in the hybrid lens all satisfy formula
, i wherein, j gets natural number, and i contains the label of the optical element of focal power for each, and j is all actual optical element summations that contain focal power, and Φ is the value of focal power, v
iBe the Abbe number of refraction dispersive power or the Abbe number of diffraction dispersive power.
On the basis of technique scheme, the spread out material of hybrid lens of described each folding is boron crown glass, zinc sulphide, zinc selenide, silicon or germanium.
On the basis of technique scheme, the described folding hybrid lens that spreads out is comprised of silicon and germanium, and its diffraction surfaces is plated on the rear surface of germainium lens.
Beneficial effect of the present invention is: the thermal expansivity of the material of all parts by whole WSS optical system, the photo-thermal expansion coefficient of each lens etc. carry out formulistic optimum combination design, have realized the temperature difference and the aberration of active compensation WSS.And use because folding spreads out to mix, reduced the use of material, dwindled the volume of WSS.
Description of drawings
Fig. 1 is the aberration of wavelength-selective switches of the present invention, the structural representation of temperature difference while compensation system;
Fig. 2 is all focal power constitutional diagrams in the WSS light path among Fig. 1;
Fig. 3 is the aberration synoptic diagram of refractor;
Fig. 4 is the aberration synoptic diagram of diffraction lens;
Fig. 5 is the aberration synoptic diagram that the embodiment of the invention is rolled over the hybrid lens combination of spreading out;
Fig. 6 is the structural representation of rolling over the hybrid lens combination embodiment that spreads out among Fig. 1.
Reference numeral:
The hybrid lens combination 2 of spreading out of optical fibre collimator array 1, folding, first fold hybrid lens 21, the second foldings hybrid lens 22 that spreads out that spreads out, housing 3, spectro-grating 4, switch chip 5.
Embodiment
Below in conjunction with drawings and Examples the present invention is described in further detail.
As shown in Figure 1, the aberration of wavelength-selective switches of the present invention, the temperature difference be compensation system simultaneously, comprise optical fibre collimator array 1, roll over the hybrid lens combination 2 of spreading out, spectro-grating 5 and switch chip 6, the folding hybrid lens combination 2 of spreading out comprises at least two foldings hybrid lens that spreads out, and each folding hybrid lens that spreads out includes refractor and diffraction lens, and the folding hybrid lens that spreads out makes up 2 outsides and also is provided with housing 4.The folding hybrid lens combination 2 of spreading out comprises first fold hybrid lens 21 and the second folding hybrid lens 22 that spreads out that spreads out in the present embodiment, and optical fibre collimator array 1 is collimated into directional light with input optical signal; Directional light enters folding and spreads out in the hybrid lens combination 2, by its corresponding first fold hybrid lens 21 that spreads out, and will the directional light refraction, expand along different directions behind the diffraction; Spectro-grating 4 is divided into single channel optical signal with light beam, and converges to switch chip 6 through corresponding the second folding hybrid lens 22 that spreads out; Switch chip 6 is used for cutting light and conversion, and the light after being switched namely through second folding spreads out hybrid lens 22 to spectro-grating 4 along reflexing in the optical fibre collimator array 1 in the other direction, returns in the optical fibre collimator array 1 through the first fold hybrid lens 21 that spreads out again.Wherein, folding spread out each folding in the hybrid lens combination 2 spread out the diffraction surfaces of hybrid lens can the different directions setting, preferred, the spread out identical setting of diffraction surfaces direction of hybrid lens of all foldings.Described switch chip 6 can be based on the WSS of light path and MEMS (micro electro mechanical system) principle, carries out the switching of light by the micromirror position of adjusting this WSS.Described switch chip 6 can also be based on the WSS of liquid crystal on silicon principle, carries out the switching of light by the liquid crystal phase place of adjusting this WSS.
As shown in Figure 2, be all focal power constitutional diagrams in the WSS light path, need to consider the optical element of all physical presence focal powers of WSS optical system, wherein Φ 1, Φ 2, Φ 3 ... Φ j, j is natural number, the focal power of respectively corresponding each optical element, and the rightmost side is focusing surface, such as Φ among Fig. 21, Φ 2, Φ 3 ... Φ j, respectively corresponding optical element 1,2,3 ... j.
As shown in Figure 3, aberration synoptic diagram for refractor, center section is refractor, directional light after the left side incident standard, through behind the refractor, because the aberration of refractor, the position that the light of different colours converges is different, different such as the position that Red and blue light among the figure is assembled, the more close refractor in position that blue light is assembled.
As shown in Figure 4, chromaticity difference diagram for diffraction lens, center section is diffraction lens, directional light after the left side incident standard, through behind the diffraction lens, converging of directional light is just opposite with refractor, and the position that Red and blue light is assembled is still different, but the more close diffraction lens in position that ruddiness is assembled.
As shown in Figure 5, roll over the aberration synoptic diagram of the hybrid lens combination 2 of spreading out for the present invention; With respect to Fig. 3 and Fig. 4, the folding hybrid lens combination 2 of spreading out is equivalent to the combination of refractor and diffraction lens, directional light is injected by refractor one side, via the folding hybrid lens that spreads out, penetrated by diffraction lens one side, as seen the light that penetrates is white light, and it is identical to assemble the position, and the aberration of the light path of hence one can see that whole WSS is by intact compensation.
Such as Fig. 1, Fig. 2 and shown in Figure 5, the method that the aberration of wavelength-selective switches of the present invention, the temperature difference compensate simultaneously comprises the steps:
S1. in the WSS optical system, when satisfying the system imaging quality requirements, suitably match material and reasonable distribution focal power, described focal power equals the poor of picture side's light beam convergence and object space light beam convergence, and it characterizes the ability of optical system deviation light.As shown in Equation 1:
I wherein, j is natural number, and i contains the label of the optical element of focal power for each, and j is all actual optical element summations that contain focal power, and Φ is the value of focal power; Formula above realizing is so that the focal power of whole WSS optical system is consistent with the realization of light splitting function.
S2. according to diffraction lens negative Abbe coefficient is arranged, distribute combination by the focal power of refractor and diffraction lens, obtain the achromatism condition of whole WSS optical system, the refractor and the diffraction lens that require each folding to spread out in the hybrid lens all satisfy formula formula 2:
I wherein, j is natural number, and i contains the label of the optical element of focal power for each, and j is all actual optical element summations that contain focal power, and Φ is the value of focal power, v
iBe the Abbe number of refraction dispersive power or the Abbe number of diffraction dispersive power, described Abbe number is exactly the inverse proportion index that represents the transparency material dispersive power, and the less dispersion phenomenon of numerical value is more severe.By formula 2 as seen, distribute combination according to the spread out focal power of hybrid lens combination 2 of folding, the focal power of each optical element is carried out summation with the ratio of corresponding Abbe number, and total value is zero, realize the achromatism of whole WSS optical system with this.
S3. select to satisfy simultaneously the lens material of S1 and S2 and the material of housing, according to the basic light path principle of WSS, when realizing the WSS basic function, because whole WSS optical system should be eliminated again color difference eliminating of thermal aberration, then also need satisfy the thermal aberration condition that disappears, condition as shown in Equation 3:
L wherein, k gets natural number.
Be the linear expansion coefficient sum of housing 3 and switch chip 5, T is the environment temperature of optical element.The image planes out of focus that whole WSS optical system itself is produced by formula 3 is consistent with expanding with heat and contract with cold of housing 3; Described switch chip 5 can refer to the micro mirror based on MEMS principle WSS, also can refer to the liquid crystal silicon based on liquid crystal on silicon principle WSS.
In sum, as long as the WSS optical system satisfies the formula in these three steps simultaneously, just can realize disappear heat and achromatism.
As described in Figure 1, optical fibre collimator array 1 mainly plays the effect of collimation as the incident portion of light and the receiving portion of back light to incident light, and calculates and select light beam to carry out next step operation in suitable radius.Focal length needs according to each extender lens in the WSS optical system, first fold spread out hybrid lens 21 and the second folding spread out hybrid lens 22 and corresponding housing 3, need selecting can achromatism and the material of the temperature difference, as shown in Figure 6, be embodiments of the invention, select bi-material to make first fold spread out hybrid lens 21 and the second folding hybrid lens 22 that spreads out, usually select Si, the material that the photo-thermal expansion coefficients comparisons such as Ge are large comes balanced whole light path, and the photo-thermal expansion coefficient of common optical material and the thermal expansivity of alternative case material are as shown in table 1.
Table 1
For selecting of housing 3, take Invar 36 as example, its photo-thermal expansion coefficient is-36 * 10
-6, cold deformation can reduce thermal expansivity, and the thermal treatment in specific range of temperatures can make the thermal expansivity stabilization, and Invar 36 has corrosion resistivity in the drying at room temperature air;-250 ℃ and+have extremely low thermal expansivity between 200 ℃, well plasticity and toughness.In addition, roll over the hybrid lens combination of spreading out by diffraction surfaces being processed on the one side of refractor, being consisted of, do not need the 3rd lens material, thereby greatly reduce use and the device volume of lens.
Compared to the hot hybrid lens that disappears, the hybrid lens that spreads out of the folding among the present invention had both improved thermal behavior and aberration, had reduced again volume and quality simultaneously.For the application in the wide temperature range, the present invention has very large advantage; Roll over the hybrid lens combination of spreading out and can have the surface configuration more flat than total refraction achromat, small curve helps less monochromatic aberration simultaneously, and it is less to make required material, is easy to processing; These are good methods for the higher cost of WSS.
The present invention is not limited to above-mentioned embodiment, for those skilled in the art, under the prerequisite that does not break away from the principle of the invention, can also make some improvements and modifications, and these improvements and modifications also are considered as within protection scope of the present invention.The content that is not described in detail in this instructions belongs to the known prior art of this area professional and technical personnel.
Claims (10)
1. the aberration of a wavelength-selective switches, temperature difference while compensation system is characterized in that, comprising:
Optical fibre collimator array is used for input optical signal is collimated into directional light;
Spread out hybrid lens combination of folding comprises at least two foldings hybrid lens that spreads out, and all is used for will directional light reflecting, expands along different directions behind the diffraction;
Spectro-grating is used for light beam is divided into single channel optical signal, and converges to switch chip through the corresponding folding hybrid lens that spreads out;
Switch chip is used for cutting light and conversion, and the light after being switched is along reflexing in the optical fibre collimator array in the other direction.
2. the aberration of wavelength-selective switches as claimed in claim 1, temperature difference compensation system simultaneously is characterized in that: described each folding hybrid lens that spreads out includes refractor and diffraction lens.
3. the aberration of wavelength-selective switches as claimed in claim 2, temperature difference compensation system simultaneously is characterized in that: the hybrid lens combination of spreading out of described folding also comprises and is located at its outside housing.
4. the aberration of wavelength-selective switches as claimed in claim 3, temperature difference compensation system simultaneously, it is characterized in that: described switch chip carries out the switching of light for the wavelength-selective switches based on light path and MEMS (micro electro mechanical system) principle by the micromirror position of adjusting this wavelength-selective switches.
5. the aberration of wavelength-selective switches as claimed in claim 3, temperature difference compensation system simultaneously, it is characterized in that: described switch chip carries out the switching of light for the wavelength-selective switches based on the liquid crystal on silicon principle by the liquid crystal phase place of adjusting this wavelength-selective switches.
6. the aberration of wavelength-selective switches as claimed in claim 3, temperature difference compensation system simultaneously is characterized in that: the spread out diffraction surfaces direction of hybrid lens of described each folding is consistent.
7. the method that the aberration based on claim 1 medium wavelength selector switch, the temperature difference compensate simultaneously is characterized in that, comprises the steps:
S1. in the wavelength-selective switches optical system, realize
, i wherein, j is natural number, and i contains the label of the optical element of focal power for each, and j is all actual optical element summations that contain focal power, and Φ is the value of focal power;
S2. according to the folding of the correspondence hybrid lens that spreads out, the focal power of each optical element is carried out summation with the ratio of corresponding Abbe number, and total value is zero, realizes the achromatism of whole wavelength-selective switches optical system;
The image planes out of focus that whole wavelength-selective switches optical system itself is produced is consistent with expanding with heat and contract with cold of the housing of rolling over the hybrid lens combination outside of spreading out, according to formula
, l wherein, k gets natural number,
Be the linear expansion coefficient sum of described housing and switch chip, T is environment temperature.
8. the method that compensates simultaneously of the aberration of wavelength-selective switches as claimed in claim 7, the temperature difference is characterized in that: achromatism among the described S2, the refractor and the diffraction lens that require each folding to spread out in the hybrid lens all satisfy formula
, i wherein, j gets natural number, and i contains the label of the optical element of focal power for each, and j is all actual optical element summations that contain focal power, and Φ is the value of focal power, v
iBe the Abbe number of refraction dispersive power or the Abbe number of diffraction dispersive power.
9. the method that compensates simultaneously of the aberration of wavelength-selective switches as claimed in claim 7, the temperature difference is characterized in that: the spread out material of hybrid lens of described each folding is boron crown glass, zinc sulphide, zinc selenide, silicon or germanium.
10. the method that compensates simultaneously of the aberration of wavelength-selective switches as claimed in claim 9, the temperature difference is characterized in that: the described folding hybrid lens that spreads out is comprised of silicon and germanium, and its diffraction surfaces is plated on the rear surface of germainium lens.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104238122A (en) * | 2013-06-12 | 2014-12-24 | 住友电气工业株式会社 | Dispersive device and wavelength selective switch |
| CN106772813A (en) * | 2016-12-16 | 2017-05-31 | 中央民族大学 | Resolution ratio wavelengthtunable selecting switch and control method based on phase grating array |
| CN109375317A (en) * | 2018-11-09 | 2019-02-22 | 武汉光迅科技股份有限公司 | Wavelength-selective switches |
| CN109541788A (en) * | 2018-12-29 | 2019-03-29 | 山东神戎电子股份有限公司 | A kind of non-brake method continuous zooming optical passive type is without thermalization camera lens |
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| CN1455282A (en) * | 2002-04-29 | 2003-11-12 | 南开大学 | Infrared refraction-diffraction three-piece heat-abstraction optical imaging system structure |
| US20060078251A1 (en) * | 2004-10-12 | 2006-04-13 | Metconnex Canada Inc. | Systems and methods for optical switching to colourless ports and coloured ports |
| CN102226848A (en) * | 2011-06-03 | 2011-10-26 | 孙方红 | Structure for wavelength selection switch |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1455282A (en) * | 2002-04-29 | 2003-11-12 | 南开大学 | Infrared refraction-diffraction three-piece heat-abstraction optical imaging system structure |
| US20060078251A1 (en) * | 2004-10-12 | 2006-04-13 | Metconnex Canada Inc. | Systems and methods for optical switching to colourless ports and coloured ports |
| CN102226848A (en) * | 2011-06-03 | 2011-10-26 | 孙方红 | Structure for wavelength selection switch |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104238122A (en) * | 2013-06-12 | 2014-12-24 | 住友电气工业株式会社 | Dispersive device and wavelength selective switch |
| CN104238122B (en) * | 2013-06-12 | 2017-04-12 | 住友电气工业株式会社 | Dispersive device and wavelength selective switch |
| CN106772813A (en) * | 2016-12-16 | 2017-05-31 | 中央民族大学 | Resolution ratio wavelengthtunable selecting switch and control method based on phase grating array |
| CN109375317A (en) * | 2018-11-09 | 2019-02-22 | 武汉光迅科技股份有限公司 | Wavelength-selective switches |
| CN109541788A (en) * | 2018-12-29 | 2019-03-29 | 山东神戎电子股份有限公司 | A kind of non-brake method continuous zooming optical passive type is without thermalization camera lens |
| CN109541788B (en) * | 2018-12-29 | 2021-07-27 | 山东神戎电子股份有限公司 | Uncooled continuous zooming optical passive athermalization lens |
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Application publication date: 20130320 |