CN203324572U - Thermally tunable optical filter - Google Patents
Thermally tunable optical filter Download PDFInfo
- Publication number
- CN203324572U CN203324572U CN2013204495945U CN201320449594U CN203324572U CN 203324572 U CN203324572 U CN 203324572U CN 2013204495945 U CN2013204495945 U CN 2013204495945U CN 201320449594 U CN201320449594 U CN 201320449594U CN 203324572 U CN203324572 U CN 203324572U
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- etalon
- optical filter
- catoptron
- thermal
- buffer stopper
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Abstract
The utility model relates to the field of optical communication devices, and discloses a thermally tunable optical filter which comprises input and output units, an etalon, a reflecting mirror and a thermal control unit. The thermal control unit comprises a thermal buffer block and a thermal control element. The reflecting mirror is arranged on the front surface of the thermal buffer block. The etalon is pasted on the reflecting mirror. The thermal control element is arranged on the reverse surface of the thermal buffer block. Incident light is incident to the etalon through the input and output units, then reflected by the reflecting mirror and filtered by the etalon, and then is emergent via the input and output units. A temperature control structure of applying a thermistor, a heating resistor and the thermal buffer block is adopted by the thermally tunable optical filter so that temperature on the light through surface of the etalon is evenly distributed, and thus great filtering performance is achieved; besides, the thermally tunable optical filter has advantages of being rapid in tuning speed, great in repeatability, great in environment stability and reliability, low in cost, high in rate of finished products, etc.
Description
Technical field
The utility model relates to the optical communication device field, relates in particular to a kind of thermal tuning optical filter.
Background technology
Complete measured 10G PON is also immature, the network provider of bandwidth deficiency may be selected a kind of mixing WDM-PON technology or claim TWDM-PON, WA-PON in transition period, what basic mixing WDM-PON was used is the standard of GPON, different is that several wavelength will occur down direction simultaneously, place one tunable optic filter can be more flexible cheaply at each ONT place, because these wavelength can distribute dynamically.
The technology that can be used at present adjustable light wave-filter is more, and the tunable filtering technology mainly utilizes interference of light or diffraction effect to realize selectable filtering.Specifically can be divided into acousto-optic tunable filter type, Fiber Bragg Grating FBG type, F-P chamber type (based on piezoelectricity or microelectromechanical systems (MEMS) technology) and Thin Film Filter (TFF) type etc.Wherein, acousto-optic TOF utilizes acoustooptic effect to change waveguide index period-producer grating, and its tuned speed is fast, but manufacturing cost is high, and adjacent channel isolation is poor, is not suitable for dense wave division multipurpose (DWDM) system; Grating type optical fiber TOF utilizes the optical fiber Bragg diffraction characteristic, regulate stress by controlling temperature variation, its bandwidth and adjacent channel isolation are all better, can be used for the DWDM system, but its tuning range is little, easily be subject to the impact of external environment, long-time stability are also good not, in fact all do not realize practical engineering application always; The characteristics of the TOF of the tuning angle of motor based on TFF are that cost is higher, and long-term reliability is poor, the TOF based on grating and MEMS mirror can obtain reliability still can TOF but its material and packaging cost are all higher; And that the TOF that uses tuning F-P chamber has principle is simple, the characteristics that encapsulation easily realizes.
The Raw material processing of TOF based on F-P chamber type and optical element encapsulation technology are the key factors that affects its cost.Tuning F-P chamber obtains the function apart from realization control filter center wavelength that having of tunable optic filter comparative maturity is similar to two fiber end faces of use PZT control of MICRO-OPTICS company.Although the encapsulation of this scheme can obtain the TOF that tuning range is large but structure is comparatively complicated, realizes that difficulty is large, so price is higher.In the standard of the new TWDM-PON released of FSAN, that use is about 4 * 100GHz(4 * 100GHz) tuning range, tuning range is so wide unlike C BAND, if the so wide tuning range of C BAND, general MEMS+GRATING or the angle tuning based on TFF of using, the scheme complexity of these tunable optic filters, the module high expensive, be not suitable for the demand cheaply of PON.Be easy to control and have by the scheme that thermal tuning chamber length is controlled filter wavelength, there is best cost advantage in the PON system, so become the only choosing of tunable optic filter in PON system of future generation.
F-P chamber type thermal tuning TOF compares and has the following advantages with other technologies, and (1) utilizes thermal tuning mechanism to chamber progress row minute adjustment, and tuned speed is very fast, reproducible; (2) technical matters maturation, low cost of manufacture; (3) environmental stability and good reliability.Yet the difficult point of the F-P chamber being carried out to thermal tuning is structural design, with uniformity of temperature profile on the logical light face of etalon, the filter shape obtained can not cause peak transmittance low by gross distortion, and pulse width is serious.
Summary of the invention
The purpose of this utility model is to propose a kind of thermal tuning optical filter, has good temperature homogeneity, and Insertion Loss is little, cost of products is low, yield rate is high.
For achieving the above object, the technical scheme the utility model proposes is: a kind of thermally tuned filter, comprise input-output unit, etalon, catoptron and control hot cell, and described control hot cell comprises a hot buffer stopper and control thermal element; Described catoptron is located at hot buffer stopper front, and described etalon is affixed on catoptron; Described control thermal element is located at the hot buffer stopper back side; Incident light incides on etalon through input-output unit, through mirror reflects again after etalon filtering by the input-output unit outgoing.
Further, described catoptron is the reflectance coating that is plated in hot buffer stopper surface; Perhaps described catoptron is the reflecting optics that is affixed on hot buffer stopper surface.
Further, described control thermal element comprises temperature-adjusting circuit, is affixed on the heating element at the hot buffer stopper back side and is affixed on the thermistor on catoptron; Described thermistor, heating element all are electrically connected to temperature-adjusting circuit.
Preferably, described heating element is heating resistor or semiconductor cooler.
Further, the logical optical plane of described etalon and catoptron have an angle.
Further, the size of described angle is 1 ~ 5 °.
Further, the angle of wedge formed between described etalon and catoptron is filled with light-permeable medium glue.
Further, described input-output unit is double-fiber collimator.
Further, described hot buffer stopper and etalon are located in a sleeve pipe, and described double-fiber collimator is connected with described sleeve pipe by a spaced ring; Double-fiber collimator, spaced ring and sleeve pipe are bonding successively.
The beneficial effects of the utility model are: use the structure of controlling temperature of thermistor and heating resistor, hot buffer stopper, make uniformity of temperature profile on the logical light face of etalon, thereby obtain good filtering performance; And it is fast, reproducible to have a tuned speed; Environmental stability and good reliability; Cost is low, the yield rate advantages of higher.
The accompanying drawing explanation
Fig. 1 is etalon filtering principle schematic diagram;
Fig. 2 is the utility model embodiment mono-structural representation;
The output transmission peaks schematic diagram that Fig. 3 is etalon.
Reference numeral: 1, double-fiber collimator; 2, etalon; 3, control hot cell; 301, hot buffer stopper; 302, heating resistor; 303, thermistor; 4, catoptron; 5, sleeve pipe; 6, spaced ring.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described further.
Be illustrated in figure 1 the filtering principle schematic diagram of F-P chamber etalon, its transmissivity is due to multipath reflection interference of light between two reflecting plates with the marked change of wavelength.When transmitted light for phase time, they have constructive interference, corresponding the peak value of etalon transmissivity; Corresponding the minimal value of transmissivity when transmitted light is anti-phase.Optical multiple reflector is homophase whether each other, depends on refraction angle, the thickness of etalon and the refractive index of material therefor thereof that incident light frequency, light are propagated in etalon.In the etalon of F-P chamber, when integral multiple that the optical path difference between adjacent two light beams is wavelength, its transmissivity has maximal value, and the spectral frequency that peak wavelength is corresponding is
υ
m=mc/ (2nlcos θ), m is any positive integer;
Its Refractive Index of Material n is n (T)=n (T with the variation relation of temperature T
0) [1+ β (T-T
0)];
Length of material l is l (T)=l (T with the variation relation of temperature T
0)=[1+ α (T-T
0)],
Wherein α is material expansion coefficient rate, and β is the material thermo-optical coeffecient.When etalon temperature changes, peak wavelength drifts about, and its frequency change is
υ
m(T)=?υ
m(T
0)[1-(α+β)?(T-T
0)]，
The FSR of etalon is FSR=△ υ=υ
m+1-υ
m=c/ (2nlcos θ).
Visible, required 400GHz or the 800GHz tuning range for TWDM-PON, the light path-temperature varying coefficient of material (alpha+beta) is larger, and the temperature range of tuning required variation is narrower, more is easy to realize and control; As the Si material, its thermal expansivity is 3 * 10
? -6/ K, thermo-optical coeffecient is 180 * 10
-6/ K, if need the tuning range of 400G, near communication band 1550nm, corresponding tuning temperature range approximately has 37 ℃, and, for other low thermo-optical coeffecient materials, the non-constant width of thermal tuning scope, can not realize.As Fig. 3 sees through the signal of centre wavelength variation with temperature.Because the thermo-optical coeffecient of this kind of material is large, heat is inhomogeneous also larger on its impact, obtain optics output preferably and necessarily require the uniformity of temperature profile on controlled temperature etalon.If it is inhomogeneous that the temperature of etalon is controlled, can cause chamber length and the optical path difference of etalon different at logical light face everywhere, thereby cause peak wavelength everywhere inconsistent, a certain size hot spot incides on etalon, the effect of integration is that peak I L becomes greatly, pulse width, it is wider that bottom becomes, so the design of the structure of controlling temperature of etalon is a gordian technique.
Be illustrated in figure 2 a specific embodiment of the present utility model, comprise input-output unit, etalon 2, catoptron 4 and control hot cell 3, control hot cell 3 comprises a hot buffer stopper 301 and control thermal element; Catoptron 4 is located at hot buffer stopper 301 fronts, and etalon 2 is affixed on catoptron 4; The control thermal element is located at hot buffer stopper 301 back sides; Incident light incides on etalon 2 through input-output unit, through catoptron 4 reflection again after etalon 2 filtering by the input-output unit outgoing.Wherein, catoptron 4 is for being plated in the reflectance coating on hot buffer stopper 301 surfaces, and the control thermal element comprises temperature-adjusting circuit, is affixed on the heating element at hot buffer stopper 301 back sides and is affixed on the thermistor 303 on catoptron 4; Thermistor 303, heating element all are electrically connected to temperature-adjusting circuit.Thermistor 303, near etalon 2, returns the temperature feedback on the surface of etalon 2 to temperature-adjusting circuit, form backfeed loop, and utilize temperature automatically controlled algorithm to the heating element accurate temperature controlling, and temperature is even everywhere to utilize hot buffer stopper to make the etalon surface.As shown in Figure 2, in this embodiment, input-output unit adopts a double-fiber collimator 1, and hot buffer stopper 301 is designed to one cylindrical, is socketed in sleeve pipe 5, and double-fiber collimator 1 is connected with this sleeve pipe 5 by a spaced ring 6.Wherein, the intersection length of double-fiber collimator 1 is the distance of collimating apparatus end face to catoptron, intersecting angle is about 2 °, light is from a port input of double-fiber collimator 1, collimated light incides on catoptron 4 through the incident angle with 2 ° after etalon 2, through catoptron 4 reflections, again after process etalon 2, by another port of double-fiber collimator 1, is exported.The normal of etalon 2 does not overlap with the normal of catoptron 4, the two has an angle, thereby forms an angle of wedge between etalon 2 and catoptron 4, and the large I of angle is in 1 ~ 5 ° of scope, directly be back to and return to light path with the light that prevents from being reflected by etalon 2, affect the filtering performance of adjustable filter.Etalon 2 can directly be connected on catoptron 4 with the medium of light-permeable is gluing, is about to also fill up light-permeable medium glue in the angle of wedge, also can put gluing receiving on catoptron 4 on etalon 2 surroundings, in the angle of wedge, is at this moment air dielectric.
During assembling, at first by heating element, what this embodiment adopted is heating resistor 302, bond on a face of hot buffer stopper 301, and hot buffer stopper 301 is inserted in sleeve pipe 5, and bonding solidifying.This curing part is fixed on the frock clamp on adjustment rack, double-fiber collimator 1 is fixed on the frock clamp of another one adjustment rack, the light of tunable optical source is input to the input port of double-fiber collimator 1, the output port of double-fiber collimator 1 is connected with the probe of light power meter, after the debugging bright dipping and after being adjusted to the Insertion Loss minimum value, both ends of the surface gluing by spaced ring 6, and with sleeve pipe 5, with the end face of double-fiber collimator 1, be connected respectively, solidify after glue-line is ironed, can complete the debugging of device.After having debugged, will control thermal element energising work, heating resistor 302 passes into electric current, thermistor 303 detection criterion tool 2 temperature, and the two forms a backfeed loop, and utilizes the temperature automatically controlled algorithm can be to the etalon accurate temperature controlling.After treating temperature stabilization, can test the repeatability of centre of homology wavelength.Finally can be encapsulated in a box body, be convenient to practicality.
In above-described embodiment, catoptron 4 can adopt the reflecting optics that is affixed on hot buffer stopper 301 surfaces; Heating element can also adopt semiconductor cooler.Hot buffer stopper 301 also can be processed into square other geometric configuratioies such as grade, and the material of its material selection high heat conductance, as thermal conductive ceramic or Si etc.Etalon 2 can adopt GT etalon or other Solid Cavity etalons.
Although specifically show and introduced the utility model in conjunction with preferred embodiment; but the those skilled in the art should be understood that; within not breaking away from the spirit and scope of the present utility model that appended claims limits; the various variations of in the form and details the utility model being made, be protection domain of the present utility model.
Claims (9)
1. a thermal tuning optical filter, comprise input-output unit, etalon, catoptron and control hot cell, it is characterized in that: described control hot cell comprises a hot buffer stopper and control thermal element; Described catoptron is located at hot buffer stopper front, and described etalon is affixed on catoptron; Described control thermal element is located at the hot buffer stopper back side; Incident light incides on etalon through input-output unit, through mirror reflects again after etalon filtering by the input-output unit outgoing.
2. thermal tuning optical filter as claimed in claim 1, it is characterized in that: described catoptron is the reflectance coating that is plated in hot buffer stopper surface; Perhaps described catoptron is the reflecting optics that is affixed on hot buffer stopper surface.
3. thermal tuning optical filter as claimed in claim 1, it is characterized in that: described control thermal element comprises temperature-adjusting circuit, is affixed on the heating element at the hot buffer stopper back side and is affixed on the thermistor on catoptron; Described thermistor, heating element all are electrically connected to temperature-adjusting circuit.
4. thermal tuning optical filter as claimed in claim 3, it is characterized in that: described heating element is heating resistor or semiconductor cooler.
5. thermal tuning optical filter as claimed in claim 1, it is characterized in that: logical optical plane and the catoptron of described etalon have an angle.
6. thermal tuning optical filter as claimed in claim 5, it is characterized in that: the size of described angle is 1 ~ 5 °.
7. thermal tuning optical filter as claimed in claim 5, it is characterized in that: the angle of wedge formed between described etalon and catoptron is filled with light-permeable medium glue.
8. as thermal tuning optical filter as described in claim 1-7 any one, it is characterized in that: described input-output unit is double-fiber collimator.
9. thermal tuning optical filter as claimed in claim 8, it is characterized in that: described hot buffer stopper and etalon are located in a sleeve pipe, and described double-fiber collimator is connected with described sleeve pipe by a spaced ring; Double-fiber collimator, spaced ring and sleeve pipe are bonding successively.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103792658A (en) * | 2014-02-18 | 2014-05-14 | 苏州旭创科技有限公司 | Optical standard tool |
| CN104834041A (en) * | 2015-05-11 | 2015-08-12 | 中国科学院物理研究所 | Interference filter with temperature control adjusting device |
| WO2016015262A1 (en) * | 2014-07-30 | 2016-02-04 | 华为技术有限公司 | Tunable optical device, optical network unit and passive optical network system |
| CN105572914A (en) * | 2016-02-25 | 2016-05-11 | 昂纳信息技术（深圳）有限公司 | Adjustable optical filter of optical system |
| CN105739029A (en) * | 2014-12-12 | 2016-07-06 | 福州高意通讯有限公司 | Tunable optical filter of TO package |
| CN106444011A (en) * | 2016-11-18 | 2017-02-22 | 中国电子科技集团公司第四十研究所 | Optical attenuator based on uniwafer round optical filter |
| CN109901264A (en) * | 2019-03-05 | 2019-06-18 | 中国科学技术大学 | Miniature FP chamber narrow band filter |
| CN110471197A (en) * | 2018-05-09 | 2019-11-19 | 福州高意通讯有限公司 | A kind of hot tunable filter with temperature sensing function |
| CN110737113A (en) * | 2018-07-18 | 2020-01-31 | 福州高意通讯有限公司 | small-sized adjustable wavelength optical filter |
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2013
- 2013-07-25 CN CN2013204495945U patent/CN203324572U/en not_active Expired - Lifetime
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103792658B (en) * | 2014-02-18 | 2016-03-30 | 苏州旭创科技有限公司 | Optical standard tool |
| CN103792658A (en) * | 2014-02-18 | 2014-05-14 | 苏州旭创科技有限公司 | Optical standard tool |
| CN105723633A (en) * | 2014-07-30 | 2016-06-29 | 华为技术有限公司 | Tunable optical device, optical network unit and passive optical network system |
| CN105723633B (en) * | 2014-07-30 | 2019-07-26 | 华为技术有限公司 | Tunable optical device, optical network unit and passive optical network |
| WO2016015262A1 (en) * | 2014-07-30 | 2016-02-04 | 华为技术有限公司 | Tunable optical device, optical network unit and passive optical network system |
| CN105739029A (en) * | 2014-12-12 | 2016-07-06 | 福州高意通讯有限公司 | Tunable optical filter of TO package |
| CN104834041B (en) * | 2015-05-11 | 2019-01-22 | 中国科学院物理研究所 | A kind of interference filter with temperature-control adjustment device |
| CN104834041A (en) * | 2015-05-11 | 2015-08-12 | 中国科学院物理研究所 | Interference filter with temperature control adjusting device |
| CN105572914A (en) * | 2016-02-25 | 2016-05-11 | 昂纳信息技术（深圳）有限公司 | Adjustable optical filter of optical system |
| CN106444011A (en) * | 2016-11-18 | 2017-02-22 | 中国电子科技集团公司第四十研究所 | Optical attenuator based on uniwafer round optical filter |
| CN106444011B (en) * | 2016-11-18 | 2019-04-09 | 中国电子科技集团公司第四十一研究所 | A kind of optical attenuator based on monolithic circular filter |
| CN110471197A (en) * | 2018-05-09 | 2019-11-19 | 福州高意通讯有限公司 | A kind of hot tunable filter with temperature sensing function |
| CN110737113A (en) * | 2018-07-18 | 2020-01-31 | 福州高意通讯有限公司 | small-sized adjustable wavelength optical filter |
| CN109901264A (en) * | 2019-03-05 | 2019-06-18 | 中国科学技术大学 | Miniature FP chamber narrow band filter |
| WO2020177350A1 (en) * | 2019-03-05 | 2020-09-10 | 中国科学技术大学 | Miniature fp cavity narrowband filter |
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