CN202404024U - Cascade optical waveguide sensor based on passive resonant cavity and grating demultiplexer - Google Patents
Cascade optical waveguide sensor based on passive resonant cavity and grating demultiplexer Download PDFInfo
- Publication number
- CN202404024U CN202404024U CN2011205416922U CN201120541692U CN202404024U CN 202404024 U CN202404024 U CN 202404024U CN 2011205416922 U CN2011205416922 U CN 2011205416922U CN 201120541692 U CN201120541692 U CN 201120541692U CN 202404024 U CN202404024 U CN 202404024U
- Authority
- CN
- China
- Prior art keywords
- resonant cavity
- passive resonant
- demodulation multiplexer
- grating
- grating demodulation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 22
- 238000001228 spectrum Methods 0.000 claims abstract description 8
- 230000000737 periodic effect Effects 0.000 claims abstract description 6
- 239000000126 substance Substances 0.000 abstract description 2
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 230000010354 integration Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 6
- 230000035945 sensitivity Effects 0.000 description 6
- 230000003595 spectral effect Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 238000001914 filtration Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- BJQHLKABXJIVAM-UHFFFAOYSA-N bis(2-ethylhexyl) phthalate Chemical compound CCCCC(CC)COC(=O)C1=CC=CC=C1C(=O)OCC(CC)CCCC BJQHLKABXJIVAM-UHFFFAOYSA-N 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 235000021393 food security Nutrition 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 230000001953 sensory effect Effects 0.000 description 1
Images
Landscapes
- Optical Integrated Circuits (AREA)
Abstract
The utility model discloses a cascade optical waveguide sensor based on a passive resonant cavity and a grating demultiplexer, comprising a broadband light source, the passive resonant cavity with a periodic filter spectrum, the grating demultiplexer for separating different wavelengths, and a detector array, wherein the grating demultiplexer and any one detector in the detector array compose a band-pass filter; the broadband light source, the passive resonant cavity and the grating demultiplexer are sequentially connected via a waveguide; and the detector array is arranged at the focal plane position of the grating demultiplexer. According to the utility model, the low-cost broadband light source is used as an input light source, and information obtaining work for the tested substance can be directly finished via the passive resonant cavity, the grating demultiplexer and the detector array, without the need of additional high-resolution spectrograph or high-wavelength stable single-mode laser. Therefore, the cost is greatly decreased, and integration is easier.
Description
Technical field
The utility model relates to a kind of optical waveguide sensor, relates in particular to a kind of passive resonant cavity and grating demodulation multiplexer cascade optical waveguide sensor.
Background technology
The light sensing technology has crucial application as an important branch of information science technology at aspects such as industrial process control, environmental monitoring, food security and national security.The light sensing technology can solve the sensitivity that fax sense technology exists low, be subject to disturb, the sensitive time is long, the problem that detects the uneasy congruent aspect of some chemical gas.The advantage that optical sensor has is highly sensitive, volume is little, anti-electromagnetic interference capability is strong, it is integrated to be convenient to, can online detection is occupied more and more important position at sensory field.
The ultimate principle of optical waveguide sensor spare is based on the evanescent wave that the interface/surface occurred of optical fiber or slab guide; Because evanescent wave appears the surface (contact measured material) of waveguide and can return in the waveguide; And influencing the characteristic of transmitting light in the waveguide, the variation of therefore surveying transmission light in the waveguide can realize the light sensing.
As shown in Figure 1; People such as K.De Vos propose to utilize the scheme of toroidal cavity resonator as optical waveguide sensor in document (" Silicon-on-Insulat or microring resonator for sensitive and label-free biosensing ", Optics Express 15, pp.7610-7615 (2007)); Toroidal cavity resonator is a kind of of optical cavity; Because it has more sharp-pointed filtering spectral line, higher as transducer sensitivity, therefore received extensive concern.This optical waveguide sensor comprises a single-mode laser, a passive resonant cavity and the detector with periodic filter spectrum.Be connected by waveguide between single-mode laser and the passive resonant cavity and between passive resonant cavity and the detector.
The shortcoming of people's schemes such as K.De Vos is that the wavelength that needs an expensive spectrometer to measure transmission peaks moves, and its measuring accuracy is directly related with the precision of spectrometer.If with measuring near the method that certain fixed wave length luminous energy changes the transmission peaks, the single-mode laser that then needs a narrow linewidth is as light source, and the wavelength of laser instrument will have accurate relative position with the transmission peaks of resonant ring, and highly stable.The cost that these require all to have increased greatly measurement mechanism has reduced reliability.
Summary of the invention
The purpose of the utility model is the deficiency to prior art; Provide a kind of based on passive resonant cavity and grating demodulation multiplexer cascade optical waveguide sensor; Low-cost devices such as the utility model use wideband light source are as the input light source; Survey measured matter through passive resonant cavity and integrated with it grating demodulation multiplexer demodulation multiplexer and detector array, accomplish measurement simultaneously its variation.
The technical scheme that its technical matters that solves the utility model adopts is: a kind of based on passive resonant cavity and grating demodulation multiplexer cascade optical waveguide sensor, it comprises a wideband light source, passive resonant cavity, a grating demodulation multiplexer and the detector array that different wave length is separated with periodic filter spectrum; Wherein, any detector is formed a BPF. in said grating demodulation multiplexer and the detector array; Said wideband light source, passive resonant cavity and grating demodulation multiplexer are connected through waveguide successively, and detector array places the focal plane position place of grating demodulation multiplexer.
Further, also comprise an array waveguide, arbitrary detector of said detector array links to each other with the grating demodulation multiplexer through a waveguide of Waveguide array.
Further, said passive resonant cavity is ring resonator or Fabry pool sieve chamber.
Further, said grating demodulation multiplexer is echelon grating or array waveguide grating.
The beneficial effect that the utlity model has is:
Adopt cheaply wideband light source as the input light source, and the information that passive resonant cavity, grating demodulation multiplexer and detector array directly can be accomplished measured matter obtains work, need not to add high-resolution spectrometer or high Wavelength stabilized single-mode laser.Greatly reduce cost, and be easier to integrated.
Description of drawings
Fig. 1 is the optical waveguide sensor synoptic diagram based on the single passive resonator cavity;
Fig. 2 is based on the structural representation of passive resonant cavity and grating demodulation multiplexer cascade optical waveguide sensor in the utility model;
Fig. 3 is the band-pass filter spectrogram of passive resonant cavity spectrogram and grating demodulation multiplexer and each detector composition; Among the figure; (a) be that measured matter is put into into the filtering spectrogram before the sensing unit 21; (b) being that measured matter is put into sensing unit 21 filtering spectrogram afterwards, is that measured matter is put into before the sensing unit 21 power profile of each passage of detector array 4 (c); (d) be that measured matter is put into after the sensing unit 21 power profile of each passage of detector array 4; Solid line is the transmitted spectrum synoptic diagram of passive resonant cavity, and dotted line is the stack spectrum synoptic diagram that grating demodulation multiplexer and detector array are formed each passage;
Fig. 4 is that adjacent two channel powers with it of current channel number concern than with sensing unit 21 variations in refractive index;
Fig. 5 is the structural representation of second embodiment in the utility model;
Fig. 6 is the structural representation of the 3rd embodiment in the utility model;
Fig. 7 is the structural representation of the 4th embodiment in the utility model;
Fig. 8 is the structural representation of the 5th embodiment in the utility model;
Fig. 9 is the structural representation of the 6th embodiment in the utility model;
Among the figure, wideband light source 1, passive resonant cavity 2, grating demodulation multiplexer 3, detector array 4, Waveguide array 6, waveguide 7, single-mode laser 8, sensing unit 21, detector 41, BPF. 51.
Embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is further described.
Fig. 2 is first embodiment synoptic diagram of the utility model.It comprises that a wideband light source 1, one have the passive resonant cavity 2 of periodic filter spectrum, a grating demodulation multiplexer 3 and the detector array 4 that different wave length is separated.Any detector 41 is formed a BPF. 51 in grating demodulation multiplexer 3 and the detector array 4.Wherein, wideband light source 1, passive resonant cavity 2 and grating demodulation multiplexer 3 are connected by waveguide 7 successively, and detector array 4 places the focal plane position place of grating demodulation multiplexer 3.
Shown in Fig. 3 a, the difference of the centre frequency of adjacent two detector 41 pairing BPF.s 51 equates arbitrarily, is made as f
Sp, passive resonant cavity 2 has certain optical length makes the difference f of BPF. 51 centre frequencies that spacing (being called Free Spectral Range (Free Spectral Range or FSR) again) and the adjacent detector 41 of its resonance frequencies at different levels that produce is corresponding
SpCertain difference is arranged.
Shown in Fig. 3 c, when certain one-level resonance frequency of passive resonant cavity 2 just in time equates with the centre frequency of some BPF.s 51, because f
Sp≠ FSR, the centre frequency of the corresponding passage that the inferior resonance frequency of other grades of passive resonant cavity 2 will depart from, thus the luminous power that causes rest channels to receive is lower than this passage.We claim to receive the maximum passage of luminous power and are called and work as prepass.
Shown in Fig. 3 b, refractive index of existence can be by the sensing unit 21 of measured matter change in the passive resonant cavity 2, and sensing unit 21 change of refractive that have measured matter to cause can cause the variation of passive resonant cavity 2 optical lengths.The spectrum that makes passive resonant cavity 2 produce is moved.This will make the resonance frequency of aiming at originally depart from the centre frequency of corresponding with it passage, thereby causes changing when prepass, shown in Fig. 3 d.
Fig. 4 has provided the relation of current channel number along with sensing unit 21 variations in refractive index, in this example, and the Free Spectral Range FSR=125GHz of passive resonant cavity 2, f
Sp=121.875GHz, grating demodulation multiplexer have 40 passages.Therefore,, just can judge the optical length of passive resonant cavity 2, thereby obtain the refractive index information of sensing unit 21, and then know the information of measured matter by inference through judging the current channel number that receives peak power.In this example, the sensitivity of refractometry is 5 * 10
-5
Be further to improve the sensitivity of sensor, can also through relatively with when prepass adjacent about the sensitivity that recently further improves sensor of the power of two passages.Suppose that current channel number is j, then the power ratio of its adjacent two passages can be expressed as
.Fig. 4 has also provided the relation of this function along with the variations in refractive index of sensing unit 21, is 0.1 if suppose minimum distinguishable power ratio, and the resolution characteristic of refractive index just can improve 5 times so, reaches 1 * 10
-5
Fig. 5 has provided second embodiment synoptic diagram of the utility model respectively.This embodiment and first kind of embodiment difference are: in second embodiment; Link to each other by a Waveguide array 6 between grating demodulation multiplexer 3 and the detector array 4; The advantage of doing like this is, adds after the waveguide, and filtering channel is made up of a waveguide 61 in detector 41 in grating demodulation multiplexer 3, the detector array 4 and the Waveguide array 6 jointly; Help obtaining narrower filtering spectral line like this, improve the sensitivity of system.
Fig. 6-9 has provided the 3rd to the 6th the embodiment synoptic diagram of the utility model respectively.These embodiments and first kind of embodiment difference are: in third and fourth embodiment; Passive resonant cavity 2 is respectively Fabry pool sieve chamber 201 and ring resonator 202; In the 5th and the 6th embodiment, grating demodulation multiplexer 3 is respectively echelon grating 301 and array waveguide grating 302.
The foregoing description is used for the utility model of explaining, rather than the utility model is limited.In the protection domain of the spirit of the utility model and claim,, all fall into the protection domain of the utility model to any modification and the change that the utility model is made.For example passive resonant cavity can change and do the optical texture that any other can produce the periodic filter spectral line, moors sieve etalon etc. like Fabry.
Claims (4)
1. one kind based on passive resonant cavity and grating demodulation multiplexer cascade optical waveguide sensor; It is characterized in that it comprises a wideband light source (1), passive resonant cavity (2), a grating demodulation multiplexer (3) and the detector array (4) that different wave length is separated with periodic filter spectrum; Wherein, any detector (41) is formed a BPF. (51) in said grating demodulation multiplexer (3) and the detector array (4); Said wideband light source (1), passive resonant cavity (2) and grating demodulation multiplexer (3) are connected through waveguide (7) successively, and detector array (4) places the focal plane position place of grating demodulation multiplexer (3).
2. said based on passive resonant cavity and grating demodulation multiplexer cascade optical waveguide sensor according to claim 1; It is characterized in that; Also comprise an array waveguide (6), arbitrary detector (41) of said detector array (4) links to each other with grating demodulation multiplexer (3) through a waveguide of Waveguide array (6).
3. it is characterized in that based on passive resonant cavity and grating demodulation multiplexer cascade optical waveguide sensor according to claim 1 is said that said passive resonant cavity (2) is Fabry pool sieve chamber (201) or ring resonator (202).
4. it is characterized in that based on passive resonant cavity and grating demodulation multiplexer cascade optical waveguide sensor that according to claim 1 is said said grating demodulation multiplexer (3) is echelon grating (301) or array waveguide grating (302).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205416922U CN202404024U (en) | 2011-12-22 | 2011-12-22 | Cascade optical waveguide sensor based on passive resonant cavity and grating demultiplexer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205416922U CN202404024U (en) | 2011-12-22 | 2011-12-22 | Cascade optical waveguide sensor based on passive resonant cavity and grating demultiplexer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202404024U true CN202404024U (en) | 2012-08-29 |
Family
ID=46701665
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011205416922U Expired - Fee Related CN202404024U (en) | 2011-12-22 | 2011-12-22 | Cascade optical waveguide sensor based on passive resonant cavity and grating demultiplexer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202404024U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102419312A (en) * | 2011-12-22 | 2012-04-18 | 浙江大学 | Cascade optical waveguide sensor based on passive resonant cavity and grating demultiplexer |
| CN104048943A (en) * | 2014-06-09 | 2014-09-17 | 大连理工大学 | Integrated waveguide optical biochemical sensor with integration of sensation and demodulation |
| CN106441573A (en) * | 2016-09-09 | 2017-02-22 | 电子科技大学 | Small spectrometer based on multimode optical waveguide |
-
2011
- 2011-12-22 CN CN2011205416922U patent/CN202404024U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102419312A (en) * | 2011-12-22 | 2012-04-18 | 浙江大学 | Cascade optical waveguide sensor based on passive resonant cavity and grating demultiplexer |
| CN102419312B (en) * | 2011-12-22 | 2015-06-17 | 浙江大学 | Cascade optical waveguide sensor based on passive resonant cavity and grating demultiplexer |
| CN104048943A (en) * | 2014-06-09 | 2014-09-17 | 大连理工大学 | Integrated waveguide optical biochemical sensor with integration of sensation and demodulation |
| CN104048943B (en) * | 2014-06-09 | 2016-07-06 | 大连理工大学 | The integrated waveguide optical biochemical sensor of sensing and demodulating integration |
| CN106441573A (en) * | 2016-09-09 | 2017-02-22 | 电子科技大学 | Small spectrometer based on multimode optical waveguide |
| CN106441573B (en) * | 2016-09-09 | 2018-03-27 | 电子科技大学 | A kind of miniature spectrometer based on multimode lightguide |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101825480B (en) | Broadband light source and cascaded optical waveguide filter-based optical sensor | |
| US9052291B2 (en) | Optical sensor based on a broadband light source and cascaded waveguide filters | |
| CN101871790B (en) | Photo sensor based on vernier effect of broadband light source and cascading optical waveguide filter | |
| US9170130B2 (en) | Fiber-optic sensor device having a second fiber bragg grating unit to reflect light passing through a fiber optic sensor | |
| US9080953B2 (en) | Optical resonator for sensor arrangement and measuring method | |
| CN103278185B (en) | Cavity ring-down fiber grating sensing demodulating device based on calibrated fiber grating | |
| CN101706424A (en) | Cascade micro cavities based digital integrated-optical waveguide sensor | |
| CN102419312B (en) | Cascade optical waveguide sensor based on passive resonant cavity and grating demultiplexer | |
| CN105758434A (en) | FBG reflectance spectrum sensing demodulation method based on linear array InGaAs scanning | |
| CN105928903B (en) | Based on cascade optical resonator optical sensor | |
| CN202404024U (en) | Cascade optical waveguide sensor based on passive resonant cavity and grating demultiplexer | |
| CN102243102A (en) | Photoelectric measuring device capable of measuring power and wavelength at same time | |
| CN101900575A (en) | Opto-sensor based on active resonant cavity and passive resonant cavity cascaded with same | |
| CN111811554A (en) | Optical cavity ring-down-based large-range high-precision fiber grating sensing method and device | |
| CN105180978B (en) | Optical sensor based on narrow-band light source and filtering characteristic adjustable element and its method | |
| CN103884683B (en) | Based on the optical sensor of F-P semiconductor laser and the cascade of film F-P optical filter | |
| CN105806511B (en) | The micro optical fiber microminiature temperature sensor of cascaded structure is bored based on ball | |
| RU2608394C1 (en) | Device for measuring parameters of physical fields | |
| Wang et al. | Macrobending fibre loss filter, ratiometric wavelength measurement and application | |
| RU161644U1 (en) | DEVICE FOR MEASURING PHYSICAL FIELD PARAMETERS | |
| RU191082U1 (en) | Self-calibrating fiber signal analyzer based on fiber Bragg gratings | |
| CN202041283U (en) | Photoelectric measuring device capable of measuring power and wave length simultaneously | |
| CN102135459B (en) | AWG (Array Waveguide Grating) differential demodulation based intensity detection type PCF-LPG (Long-Period Grating Written in a Photonic Crystal Fiber) stress sensor | |
| CN107247036B (en) | Double-ring cascading optical sensor based on vertical coupling | |
| CN112255195B (en) | Refractive index sensing device based on few-mode silicon nitride micro-ring resonator |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120829 Termination date: 20141222 |
|
| EXPY | Termination of patent right or utility model |