CN103994783B - A kind of Wavelength demodulation device based on integrated optical waveguide coupler - Google Patents
A kind of Wavelength demodulation device based on integrated optical waveguide coupler Download PDFInfo
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- CN103994783B CN103994783B CN201410222293.8A CN201410222293A CN103994783B CN 103994783 B CN103994783 B CN 103994783B CN 201410222293 A CN201410222293 A CN 201410222293A CN 103994783 B CN103994783 B CN 103994783B
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Abstract
The invention discloses a kind of Wavelength demodulation device based on integrated optical waveguide coupler.Including integrated optical waveguide coupler, the first photodetector, the second photodetector, analog-to-digital conversion module and processor；Two outfans of integrated optical waveguide coupler connect the first photodetector and the input of the second photodetector respectively, the outfan of the first photodetector and the second photodetector connects the input of analog-to-digital conversion module, and the outfan of analog-to-digital conversion module connects processor.This device adopts integrated optical waveguide coupler that the wavelength information of flashlight to be demodulated is converted into power information, can realize the dynamic and static demodulation of signal；Owing to the stability of integrated device is more excellent, the performance of noiseproof of this device is good, simple in construction, compact, and cost is low.
Description
Technical field
The invention belongs to wavelength interrogation technique field, more particularly, to a kind of Wavelength demodulation device based on integrated optical waveguide coupler.
Background technology
In modern sensor monitoring field, it is a big focus using wavelength-modulated as the technology that ultimate principle carries out sensing.So-called wavelength-modulated, it is simply that the information of physical quantity is changed into wavelength information, and this method has very strong capacity of resisting disturbance (such as anti-light source fluctuation, bending loss of optical fiber, phase ambiguity etc.).The exemplary of wavelength-modulated sensing has: the monitoring of optical fiber grating sensing, gaseous environment, laser light source stable monitoring etc..Wherein, the principle of optical fiber grating sensing is as follows: adopt wide spectrum light source incident, the optical signal of spectrum width extremely narrow near its centre wavelength can be reflected back by fiber grating, the centre wavelength of fiber grating is relevant with screen periods and Effective index, and both is by the impact of external physical quantity (such as temperature, stress, pressure etc.), change so finally showing as reflection wavelength with external physical quantity change, thus carrying physical quantity information to be monitored.
In " wavelength-modulated-demodulation " sensor mechanism, wavelength, as information carrier, carries physical quantity information (or wavelength itself is as a kind of information) to be sensed.Because existing photodetector is all light intensity detection type, wavelength information can not directly obtain, and so how simply, efficiently, accurately by wavelength information extract becomes a problem demanding prompt solution.Existing demodulation scheme has following several: spectrogrph method, tunable Fabry-Perot filter method, non-equilibrium Mach-Zender instrument method, dispersion element optical spectroscopy and fiber coupler method.But they there is problems in that (1) system structure is complicated, and cost is high.The spectrogrph used such as spectrogrph method is expensive, and tunable Fabry-Perot filter method and non-equilibrium Mach-Zender instrument method need to introduce tunable devices, and dispersion element optical spectroscopy needs to introduce light-splitting device and high-resolution CCD.(2) device reliability and poor stability, practicality is not high.For introducing the scheme of tunable devices, tunable part will necessarily bring unstable factor (heat stability etc. of aging, thermo-electric device such as piezoelectric device), for dispersion element optical spectroscopy, each discrete device (spectro-grating, collimated light path, CCD etc.) needs accurate location and calibration, for fiber coupler scheme, the polarization state change that optical fiber disturbance brings can cause the deterioration of demodulation accuracy.
Summary of the invention
For disadvantages described above or the Improvement requirement of prior art, the invention provides a kind of Wavelength demodulation device based on integrated optical waveguide coupler, performance of noiseproof is good, simple in construction, compact, and cost is low, can realize the dynamic and static demodulation of signal.
For achieving the above object, according to one aspect of the present invention, it is provided that a kind of Wavelength demodulation device, it is characterised in that include integrated optical waveguide coupler, the first photodetector, the second photodetector, analog-to-digital conversion module and processor；Two outfans of described integrated optical waveguide coupler connect described first photodetector and the input of described second photodetector respectively, the outfan of described first photodetector and described second photodetector connects the input of described analog-to-digital conversion module, and the outfan of described analog-to-digital conversion module connects described processor；Described integrated optical waveguide coupler for being converted into the output of two paths of signals light by flashlight to be demodulated；Described first photodetector and described second photodetector are respectively used to receive the two paths of signals light of described integrated optical waveguide coupler output, and convert light signals into the signal of telecommunication；Described analog-to-digital conversion module is for being converted to digital electric signal by analog electrical signal；Described processor obtains the wavelength of flashlight to be demodulated for utilizing digital electric signal.
Preferably, described processor is used for utilizing digital electric signal to calculate and obtains P'=(P1-P2)/(P1+P2), and the relation according to P' Yu signal light wavelength to be demodulated, obtain the wavelength of flashlight to be demodulated, wherein, P1And P2The respectively luminous power of the two paths of signals light of described integrated optical waveguide coupler output.
Preferably, described integrated optical waveguide coupler includes Si substrate, SiO2Covering and Si sandwich layer；Described Si sandwich layer includes the first monomode optical waveguide and the second monomode optical waveguide, is made up of short straight wave guide, S shape waveguide and long straight wave guide respectively, and wherein, S shape waveguide is connected and composed by the circular arc waveguide that two sections of radius of curvature are identical；Described first monomode optical waveguide and described second monomode optical waveguide are parallel to each other and centrosymmetry each other；The ridge width respectively W of described first monomode optical waveguide and described second monomode optical waveguide1And W2, interior ridge height respectively H1And H2, ectoloph height respectively h1And h2, W1=W2, H1=H2, h1=h2=k H1, k is 0.5～0.85.
Preferably, W1And W2It it is 2.5～4.5 μm.
Preferably, H1And H2It it is 8～10 μm.
Preferably, the coupled zone length of described integrated optical waveguide coupler is 200～400 μm.
In general, by the contemplated above technical scheme of the present invention compared with prior art, have the advantages that
1, adopt integrated optical waveguide coupler that the wavelength information of flashlight to be demodulated is converted into power information, directly reflect wavelength information due to luminous power, the dynamic and static demodulation of signal can be realized.
2, the manufacturing process of integrated optical waveguide coupler is ripe, flow process is simple, it is possible to achieve large-scale production, and owing to the stability of integrated device is more excellent, the performance of noiseproof of Wavelength demodulation device is good, simple in construction, compact, and cost is low.
Accompanying drawing explanation
Fig. 1 is the Wavelength demodulation device schematic diagram of the embodiment of the present invention；
Fig. 2 is the axonometric chart of integrated optical waveguide coupler；
Fig. 3 is the waveguiding structure schematic diagram of integrated optical waveguide coupler；
Fig. 4 is the coupled zone structural representation of integrated optical waveguide coupler；
Fig. 5 is the wavelength response curve of the Wavelength demodulation device of the embodiment of the present invention 1；
Fig. 6 is the wavelength response curve of the Wavelength demodulation device of the embodiment of the present invention 2.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the present invention, is not intended to limit the present invention.As long as just can be mutually combined additionally, technical characteristic involved in each embodiment of invention described below does not constitute conflict each other.
As it is shown in figure 1, the Wavelength demodulation device of the present invention includes: integrated optical waveguide coupler, the first photodetector, the second photodetector, analog-to-digital conversion module and processor.Two outfans of integrated optical waveguide coupler connect the first photodetector and the input of the second photodetector respectively, the outfan of the first photodetector and the second photodetector connects the input of analog-to-digital conversion module, and the outfan of analog-to-digital conversion module connects processor.
The operation principle of above-mentioned Wavelength demodulation device is as follows: after extraneous flashlight to be demodulated enters integrated optical waveguide coupler, obtain two-way and carry the flashlight output of wavelength information, they are received by the first photodetector and the second photodetector and are converted into the signal of telecommunication respectively, analog electrical signal is converted to digital electric signal by analog-to-digital conversion module, and processor utilizes digital electric signal calculating to obtain P'=(P1-P2)/(P1+P2), wherein, P1And P2The respectively luminous power of two paths of signals light, due to P' and signal light wavelength λ within the specific limits in linear approximate relationship P'=f (λ), and for the waveguide coupler of fixed structure, f (λ) can pass through beam propagation method (BeamPropagationMethod, BPM) emulation obtains, such that it is able to the relation according to P' Yu signal light wavelength λ, obtain the wavelength of flashlight to be demodulated.
As shown in Figures 2 and 3, integrated optical waveguide coupler is dual pathways coupler structure, it includes the first monomode optical waveguide and the second monomode optical waveguide, it is made up of that (long and short is all relative respectively with long straight wave guide short straight wave guide, S shape waveguide, to embody the relative length relation of straight wave guide), wherein, S shape waveguide is connected and composed by the circular arc waveguide that two sections of radius of curvature are identical, and S shape connects and is used for reducing patten transformation loss.First monomode optical waveguide and the second monomode optical waveguide are parallel to each other and centrosymmetry each other.
As shown in Figure 4, integrated optical waveguide coupler adopts SOI ridged waveguide structure, including silicon-based substrate, SiO2Covering and Si sandwich layer.The ridge width respectively W of the first monomode optical waveguide and the second monomode optical waveguide1And W2, interior ridge height respectively H1And H2, ectoloph height respectively h1And h2, waveguide spacing in coupled zone is d, and the wavelength resolution R of Wavelength demodulation device can be impacted by the change of above-mentioned parameter.By following size design, it is possible to obtain higher wavelength resolution: W1=W2It is 2.5～4.5 μm, H1=H2It is 8～10 μm, h1=h2=k H1, k is 0.5～0.85, and coupled zone length L is 200～400 μm.
Increase coupled zone length L, reduce coupled zone waveguide spacing d, increase h1And h2, wavelength resolution can be improved, but the insertion loss simultaneously also resulting in integrated optical waveguide coupler increases, therefore, the concrete value of above-mentioned parameter should be determined according to actual needs.
Embodiment 1
The Wavelength demodulation device containing above-mentioned integrated optical waveguide coupler is utilized to realize Wavelength demodulation.Wherein, length L=400 μm, coupled zone, coupled zone waveguide spacing d=1 μm, interior ridge height H1=H2=8 μm, ectoloph height h1=h2=6.5 μm, ridge width W1=W2=3 μm.The relation of P' and signal light wavelength λ is obtained as shown in Figure 5, it is possible to realize the approximately linear detection of 1535～1565nm wave band (C-band) by BPM emulation.Photodetector sensitivity is 10-5MW, input signal light power is 1～10mW, and its theoretical wavelength resolution is about 1.1pm, and practical application medium wavelength resolution is at least at 10pm magnitude (0.01nm).After extraneous flashlight to be demodulated enters integrated optical waveguide coupler, processor calculates and obtains P', and the relation according to P' Yu signal light wavelength λ obtains the wavelength of flashlight to be demodulated.
Embodiment 2
The Wavelength demodulation device containing above-mentioned integrated optical waveguide coupler is utilized to realize Wavelength demodulation.Wherein, length L=200 μm, coupled zone, coupled zone waveguide spacing d=1 μm, interior ridge height H1=H2=8 μm, ectoloph height h1=h2=4 μm, ridge width W1=W2=3 μm.The relation of P' and signal light wavelength λ to be demodulated is obtained as shown in Figure 6 by BPM emulation, the equally possible approximately linear detection realizing C-band, its theoretical wavelength resolution is about 4.6pm, although resolution is relatively low, but the insertion loss of integrated optical waveguide coupler is also less.After extraneous flashlight to be demodulated enters integrated optical waveguide coupler, processor calculates and obtains P', and the relation according to P' Yu signal light wavelength λ obtains the wavelength of flashlight to be demodulated.
Those skilled in the art will readily understand; the foregoing is only presently preferred embodiments of the present invention; not in order to limit the present invention, all any amendment, equivalent replacement and improvement etc. made within the spirit and principles in the present invention, should be included within protection scope of the present invention.
Claims (5)
1. a Wavelength demodulation device, it is characterised in that include integrated optical waveguide coupler, the first photodetector, the second photodetector, analog-to-digital conversion module and processor；
Two outfans of described integrated optical waveguide coupler connect described first photodetector and the input of described second photodetector respectively, the outfan of described first photodetector and described second photodetector connects the input of described analog-to-digital conversion module, and the outfan of described analog-to-digital conversion module connects described processor；
Described integrated optical waveguide coupler for being converted into the output of two paths of signals light by flashlight to be demodulated；Described first photodetector and described second photodetector are respectively used to receive the two paths of signals light of described integrated optical waveguide coupler output, and convert light signals into the signal of telecommunication；Described analog-to-digital conversion module is for being converted to digital electric signal by analog electrical signal；Described processor obtains the wavelength of flashlight to be demodulated for utilizing digital electric signal；
Described integrated optical waveguide coupler includes Si substrate, SiO2Covering and Si sandwich layer；Described Si sandwich layer includes the first monomode optical waveguide and the second monomode optical waveguide, is made up of short straight wave guide, S shape waveguide and long straight wave guide respectively, and wherein, S shape waveguide is connected and composed by the circular arc waveguide that two sections of radius of curvature are identical；Described first monomode optical waveguide and described second monomode optical waveguide are parallel to each other and centrosymmetry each other；The ridge width respectively W of described first monomode optical waveguide and described second monomode optical waveguide1And W2, interior ridge height respectively H1And H2, ectoloph height respectively h1And h2, W1=W2, H1=H2, h1=h2=k H1, k is 0.5～0.85.
2. Wavelength demodulation device as claimed in claim 1, it is characterised in that described processor is used for utilizing digital electric signal to calculate and obtains P'=(P1-P2)/(P1+P2), and the relation according to P' Yu signal light wavelength to be demodulated, obtain the wavelength of flashlight to be demodulated, wherein, P1And P2The respectively luminous power of the two paths of signals light of described integrated optical waveguide coupler output.
3. Wavelength demodulation device as claimed in claim 1 or 2, it is characterised in that W1And W2It it is 2.5～4.5 μm.
4. Wavelength demodulation device as claimed in claim 1 or 2, it is characterised in that H1And H2It it is 8～10 μm.
5. Wavelength demodulation device as claimed in claim 1 or 2, it is characterised in that the coupled zone length of described integrated optical waveguide coupler is 200～400 μm.
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1096278A1 (en) * | 1998-07-03 | 2001-05-02 | NEC Corporation | Optical integrated module |
| US6639887B1 (en) * | 1999-01-27 | 2003-10-28 | Pioneer Corporation | Optical apparatus with laser light receiver and focus error generator in the same layer |
| CN1475822A (en) * | 2002-07-02 | 2004-02-18 | 新田株式会社 | Optical Waveguide coupler line device |
| TW200419205A (en) * | 2002-10-29 | 2004-10-01 | Canon Kk | Optical waveguide device, optical and electrical elements combined device, method of driving the same, and electronic equipment using the same |
| TW200424581A (en) * | 2003-01-30 | 2004-11-16 | Sony Corp | Optical waveguide path and optical signal transceiver module |
| CN101799334A (en) * | 2010-03-03 | 2010-08-11 | 中国科学院半导体研究所 | Silicon-based optical wave guide temperature sensor based on Mach-Zehnder structure |
| CN101893562A (en) * | 2010-06-22 | 2010-11-24 | 浙江大学 | High-sensitivity integrated optical waveguide sensor based on digital droplet sample introduction channel |
| CN102636200A (en) * | 2012-03-02 | 2012-08-15 | 中国科学院半导体研究所 | High-sensitivity sensing system based on light intensity detection |
| CN103235363A (en) * | 2013-04-22 | 2013-08-07 | 天津工业大学 | Array waveguide grating demodulation integration micro system |
-
2014
- 2014-05-23 CN CN201410222293.8A patent/CN103994783B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1096278A1 (en) * | 1998-07-03 | 2001-05-02 | NEC Corporation | Optical integrated module |
| US6639887B1 (en) * | 1999-01-27 | 2003-10-28 | Pioneer Corporation | Optical apparatus with laser light receiver and focus error generator in the same layer |
| CN1475822A (en) * | 2002-07-02 | 2004-02-18 | 新田株式会社 | Optical Waveguide coupler line device |
| TW200419205A (en) * | 2002-10-29 | 2004-10-01 | Canon Kk | Optical waveguide device, optical and electrical elements combined device, method of driving the same, and electronic equipment using the same |
| TW200424581A (en) * | 2003-01-30 | 2004-11-16 | Sony Corp | Optical waveguide path and optical signal transceiver module |
| CN101799334A (en) * | 2010-03-03 | 2010-08-11 | 中国科学院半导体研究所 | Silicon-based optical wave guide temperature sensor based on Mach-Zehnder structure |
| CN101893562A (en) * | 2010-06-22 | 2010-11-24 | 浙江大学 | High-sensitivity integrated optical waveguide sensor based on digital droplet sample introduction channel |
| CN102636200A (en) * | 2012-03-02 | 2012-08-15 | 中国科学院半导体研究所 | High-sensitivity sensing system based on light intensity detection |
| CN103235363A (en) * | 2013-04-22 | 2013-08-07 | 天津工业大学 | Array waveguide grating demodulation integration micro system |
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