CN205157831U - Take wavelength marking function's gaussian filtering ware - Google Patents
Take wavelength marking function's gaussian filtering ware Download PDFInfo
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- CN205157831U CN205157831U CN201521008347.7U CN201521008347U CN205157831U CN 205157831 U CN205157831 U CN 205157831U CN 201521008347 U CN201521008347 U CN 201521008347U CN 205157831 U CN205157831 U CN 205157831U
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Abstract
The utility model discloses a take wavelength marking function's gaussian filtering ware, including the seal box, be equipped with first collimater, gaussian filtering ware, mark wave filter and second collimater in it, first collimater and second collimater are all through optic fibre and outside PC articulate, light gets into first collimater through optic fibre, and rethread gaussian filtering ware carries out low pass filter behind the collimation, then the light of process mark wave filter filtering specific wavelength, at last through the output of second collimater. The utility model discloses optic system has been simplified to the two kinds of functions of gaussian filtering ware and location filtering that possess simultaneously, has reduced the cost of system simultaneously, has great practical application and worth.
Description
Technical field
The utility model relates to wave filter, particularly relates to a kind of Gaussian filter of bandgap wavelength mark function.
Background technology
Fiber grating be a kind of by certain method make fiber core refractive index generation axial cyclic modulation and formed diffraction grating, be a kind of passive filtering device.Because grating fibers has, volume is little, splice loss, splice attenuation is little, be entirely compatible with optical fiber, can imbed the advantages such as intellectual material, and the change of its resonance wavelength to external environments such as temperature, strain, refractive index, concentration is more responsive, is therefore widely used in optical fiber communication and sensory field.The wavelength of most importantly demodulating fiber bragg grating in fiber grating sensing system, the demodulation accuracy of wavelength and stability are directly connected to precision and the accuracy of sensor.For ensureing that the precision and stability of wavelength usually utilizes Wavelength stabilized Gaussian filter to carry out calibrating and utilize positioning filter to demarcate etalon wavelength in sensor-based system; But because device is more in actual use, cause Optical Demodulation system (as shown in Figure 1) more complicated, be unfavorable for the modularization of system.
Utility model content
The technical problems to be solved in the utility model is that the device for prior art alignment and demarcation is more, cause Optical Demodulation systematic comparison complicated, be unfavorable for the modular defect of system, provide a kind of structure simple and the Gaussian filter of the bandgap wavelength mark function of system cost can be reduced.
The utility model solves the technical scheme that its technical matters adopts:
A kind of Gaussian filter of bandgap wavelength mark function is provided, comprises seal box, in it, be provided with first collimator, Gaussian filter, mark wave filter and the second collimating apparatus; First collimator is all connected with exterior PC joint by optical fiber with the second collimating apparatus;
Light enters first collimator by optical fiber, after collimation, carry out low-pass filtering again by Gaussian filter, then through the light of mark wave filter filtering specific wavelength, exports finally by the second collimating apparatus.
In the Gaussian filter of bandgap wavelength mark function described in the utility model, this mark wave filter is rejection filter, is fixed together with Gaussian filter.
In the Gaussian filter of bandgap wavelength mark function described in the utility model, this mark wave filter is wedge, the one side of this wedge has crossed one deck bandpass filtering film, through the filtered light of Gaussian filter this wedge incident, export by entering the second collimating apparatus again after the reflection of this bandpass filtering film.
In the Gaussian filter of bandgap wavelength mark function described in the utility model, in sealing case, be full of nitrogen.
The beneficial effect that the utility model produces is: the Gaussian filter of bandgap wavelength mark function of the present utility model, the Gaussian filter simultaneously possessed and location filtering two kinds of functions, simplify light path system, reduce the cost of system simultaneously, there is larger actual application value.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the utility model is described in further detail, in accompanying drawing:
Fig. 1 is the structural representation of demodulating system in prior art;
Fig. 2 is the structural representation of the Gaussian filter of the utility model first example belt lambad labeling function;
Fig. 3 is the structural representation of the Gaussian filter of the utility model second example belt lambad labeling function;
Fig. 4 a is the normal light spectrogram of Gaussian filter;
Fig. 4 b is the spectrogram after mark wave filter;
Fig. 5 is the demodulating system structural representation of the Gaussian filter adopting the utility model bandgap wavelength mark function.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
The Gaussian filter of the utility model example belt lambad labeling function, as shown in Figure 2, comprises seal box 104, is provided with first collimator 101, Gaussian filter 102, mark wave filter 105 and the second collimating apparatus 103 in it; First collimator 101 is all connected with exterior PC joint by optical fiber with the second collimating apparatus 103; Light enters first collimator 101 by optical fiber, after collimation, carry out low-pass filtering again by Gaussian filter 102, then through the light of mark wave filter 105 filtering specific wavelength, exports finally by the second collimating apparatus 103.
In first embodiment of the present utility model, as shown in Figure 2, this mark wave filter 105 is rejection filter, is fixed together, as being sticky in together by glass cement with Gaussian filter 102.Wherein optical fiber collimator 101,103 can select Glens, the service band of Gaussian filter 102 is 1280nm ~ 1330nm, FSR is 350GHz, the normal spectrum of Gaussian filter 2 as shown in fig. 4 a, mark wave filter 105 is rejection filter, and stopband is 1316 ~ 1320nm, utilizes glass cement to fix Gaussian filter and rejection filter in the utility model, form the bandpass filter of tape label function, wherein marking wavelength is 1318nm; Concrete spectrum as shown in Figure 4 b; Then entirety is carried out hermetically sealed, can be filled with nitrogen simultaneously, keep good overall thermal stability in seal box class.
In order to reduce the cost of system further, the utility model second embodiment devises another organization plan, as shown in Figure 3, the Gaussian filter of bandgap wavelength mark function comprises seal box 204, is provided with first collimator 201, Gaussian filter 202, wedge 203 and the second collimating apparatus 205 in it; First collimator 201 is all connected with exterior PC joint by optical fiber with the second collimating apparatus 205.Wherein the wherein one side of wedge 203 utilizes coating technique evaporation bandpass filtering film, by reflecting to form band resistance effect; Because the coating process cost with resistance in coating process is higher than the process costs of the logical plated film of band; Therefore design this reflection type optical path reduction system cost.
In this second embodiment, light enters first collimator 201 by optical fiber, low-pass filtering is carried out by Gaussian filter 202 again after collimation, through the filtered light of Gaussian filter 202 this wedge 203 incident, export by entering the second collimating apparatus 205 again after this bandpass filtering film reflection (total reflection).
Former optical fiber grating regulating system as shown in Figure 1, comprising 11 photoelectric devices, and adopt the optical fiber grating regulating system of the Gaussian filter of bandgap wavelength mark function, as shown in Figure 5, photoelectric device only has 7, shunt integral module, eliminates 1 photoelectric device, reduces the cost of system.
Should be understood that, for those of ordinary skills, can be improved according to the above description or convert, and all these improve and convert the protection domain that all should belong to the utility model claims.
Claims (4)
1. a Gaussian filter for bandgap wavelength mark function, is characterized in that, comprises seal box, is provided with first collimator, Gaussian filter, mark wave filter and the second collimating apparatus in it; First collimator is all connected with exterior PC joint by optical fiber with the second collimating apparatus;
Light enters first collimator by optical fiber, after collimation, carry out low-pass filtering again by Gaussian filter, then through the light of mark wave filter filtering specific wavelength, exports finally by the second collimating apparatus.
2. the Gaussian filter of bandgap wavelength mark function according to claim 1, is characterized in that, this mark wave filter is rejection filter, is fixed together with Gaussian filter.
3. the Gaussian filter of bandgap wavelength mark function according to claim 1, it is characterized in that, this mark wave filter is wedge, the one side of this wedge has crossed one deck bandpass filtering film, through the filtered light of Gaussian filter this wedge incident, export by entering the second collimating apparatus again after the reflection of this bandpass filtering film.
4. the Gaussian filter of bandgap wavelength mark function according to claim 1, is characterized in that, is full of nitrogen in sealing case.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521008347.7U CN205157831U (en) | 2015-12-07 | 2015-12-07 | Take wavelength marking function's gaussian filtering ware |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521008347.7U CN205157831U (en) | 2015-12-07 | 2015-12-07 | Take wavelength marking function's gaussian filtering ware |
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| CN205157831U true CN205157831U (en) | 2016-04-13 |
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| CN201521008347.7U Active CN205157831U (en) | 2015-12-07 | 2015-12-07 | Take wavelength marking function's gaussian filtering ware |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109802743A (en) * | 2017-11-17 | 2019-05-24 | 海思光电子有限公司 | Filter and optical add/drop multiplexer are downloaded in one kind |
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2015
- 2015-12-07 CN CN201521008347.7U patent/CN205157831U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109802743A (en) * | 2017-11-17 | 2019-05-24 | 海思光电子有限公司 | Filter and optical add/drop multiplexer are downloaded in one kind |
| US11095386B2 (en) | 2017-11-17 | 2021-08-17 | Huawei Technologies Co., Ltd. | Add/drop filter and optical add/drop multiplexer |
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