KR101670287B1 - wavelength variable optical filter and optical sensor system using the same - Google Patents
wavelength variable optical filter and optical sensor system using the same Download PDFInfo
- Publication number
- KR101670287B1 KR101670287B1 KR1020150191038A KR20150191038A KR101670287B1 KR 101670287 B1 KR101670287 B1 KR 101670287B1 KR 1020150191038 A KR1020150191038 A KR 1020150191038A KR 20150191038 A KR20150191038 A KR 20150191038A KR 101670287 B1 KR101670287 B1 KR 101670287B1
- Authority
- KR
- South Korea
- Prior art keywords
- optical
- wavelength
- light
- core layer
- electro
- Prior art date
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 112
- 239000012792 core layer Substances 0.000 claims abstract description 24
- 239000000463 material Substances 0.000 claims abstract description 23
- 238000009826 distribution Methods 0.000 claims description 23
- 239000013307 optical fiber Substances 0.000 claims description 23
- 238000001514 detection method Methods 0.000 claims description 16
- 239000004926 polymethyl methacrylate Substances 0.000 claims description 8
- 229910003327 LiNbO3 Inorganic materials 0.000 claims description 7
- 239000007836 KH2PO4 Substances 0.000 claims description 4
- 229910012463 LiTaO3 Inorganic materials 0.000 claims description 4
- LFVGISIMTYGQHF-UHFFFAOYSA-N ammonium dihydrogen phosphate Chemical compound [NH4+].OP(O)([O-])=O LFVGISIMTYGQHF-UHFFFAOYSA-N 0.000 claims description 4
- 238000005253 cladding Methods 0.000 claims description 4
- 229910000402 monopotassium phosphate Inorganic materials 0.000 claims description 4
- 235000019796 monopotassium phosphate Nutrition 0.000 claims description 4
- GNSKLFRGEWLPPA-UHFFFAOYSA-M potassium dihydrogen phosphate Chemical compound [K+].OP(O)([O-])=O GNSKLFRGEWLPPA-UHFFFAOYSA-M 0.000 claims description 4
- 229920003229 poly(methyl methacrylate) Polymers 0.000 claims 2
- 230000001902 propagating effect Effects 0.000 claims 1
- 230000035484 reaction time Effects 0.000 description 10
- 239000000835 fiber Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000382 optic material Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/001—Optical devices or arrangements for the control of light using movable or deformable optical elements based on interference in an adjustable optical cavity
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/02—Details
- G01J1/04—Optical or mechanical part supplementary adjustable parts
- G01J1/0407—Optical elements not provided otherwise, e.g. manifolds, windows, holograms, gratings
- G01J1/0444—Optical elements not provided otherwise, e.g. manifolds, windows, holograms, gratings using means for replacing an element by another, e.g. for replacing a filter or grating
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/02—Details
- G01J1/04—Optical or mechanical part supplementary adjustable parts
- G01J1/0488—Optical or mechanical part supplementary adjustable parts with spectral filtering
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/10—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void
- G01J1/20—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void intensity of the measured or reference value being varied to equalise their effects at the detectors, e.g. by varying incidence angle
- G01J1/22—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void intensity of the measured or reference value being varied to equalise their effects at the detectors, e.g. by varying incidence angle using a variable element in the light-path, e.g. filter, polarising means
Abstract
Description
BACKGROUND OF THE
Optical sensors such as fiber gratings, which change the sensor signal in the wavelength range, require a very high level of wavelength accuracy up to 1 pm, so expensive complex wavelength tunable light sources are used in sensor systems.
Such a wavelength variable light source is variously disclosed in Korean Patent Laid-Open No. 10-2011-0070305.
The sensor system has developed to be able to operate as many sensors as possible with about 100 sensors.
On the other hand, sensor demand for power equipment such as protection relays, switchgear, and gas energy fields such as gas storage and piping is increasing. In these fields, optical sensor systems that operate small number of 10 sensors are needed. However, existing devices are expensive and difficult to apply to the field.
SUMMARY OF THE INVENTION The present invention has been devised to solve the problems described above, and it is an object of the present invention to provide a wavelength conversion device capable of generating light having a variable wavelength using a change in refractive index during a reaction time from an electro- A variable optical filter, and an optical sensor system using the variable optical filter.
According to an aspect of the present invention, there is provided a wavelength tunable optical filter including a core layer, a wavelength adjusting section capable of adjusting a wavelength of light transmitted or reflected by the core layer, And a cladding formed of an electrooptic material whose refractive index changes according to the applied electric energy; An electric pulse generator connected to the optical waveguide so as to apply a pulse potential to the optical waveguide; And a controller for controlling the driving of the electric pulse generator so that the pulse potential is applied for a first time set by the electric pulse generator, wherein the first time is a time when the wavelength of the light transmitted or reflected by the wavelength adjuster The reaction time until the electro-optical material forming the clad is changed to the stable state at the refractive index corresponding to the applied electric potential is applied so as to be varied during the first time.
According to an aspect of the present invention, an optical fiber grating formed on the core layer is applied to the wavelength adjusting section of the optical waveguide.
According to still another aspect of the present invention, the wavelength adjuster of the optical waveguide is formed of a pulsed orbital spaced apart from the core layer by 180 to 220 占 퐉 and has a diameter of 10 to 20 占 퐉.
Preferably, the electro-optical material forming the clad is at least one selected from the group consisting of poly-methylmethacrylate (PMMA), α-methylstyrene-co-maleic anhydride (Poly MSMA), P2ANS, KH2PO4, NH4H2PO4, LiTaO3, Ti: LiNbO3 and LiNbO3 do.
Also, the first time is 1 ns to 5 ms.
According to another aspect of the present invention, there is provided a sensor system including a core layer, a wavelength adjusting unit adapted to adjust a wavelength of light transmitted or reflected by the core layer, And a cladding formed of an electrooptic material whose refractive index changes according to the applied electric energy; A light source for introducing light into the core layer; An electric pulse generator connected to the optical waveguide so as to apply a pulse potential to the optical waveguide; A light distribution unit that receives light transmitted through or reflected by the wavelength adjusting unit and distributes the light to a plurality of distribution channels; Optical fiber grating sensors corresponding to the distribution channels of the optical distributor; A detection optical coupler connected to each of the distribution channels of the optical distributor and transmitting the incident light to the optical fiber grating sensor and outputting a signal traveling backward from the optical fiber grating sensor to a detection end; A photodetector for detecting a signal received from a detection terminal of each of the optical couplers for detection; And a controller for controlling the driving of the electric pulse generator so that the pulse potential is applied for a first time set by the electric pulse generator and processing a signal received by the optical detector, A reaction time until a stable state is obtained with a refractive index corresponding to a potential applied to the electrooptic material forming the clad is changed so that the wavelength of light transmitted or reflected by the adjusting unit varies during the first time.
According to an aspect of the present invention, an optical fiber grating formed on the core layer is applied to the wavelength adjuster of the optical waveguide, the light splitting unit causes the light emitted from the light source to enter the core layer, An optical circulator for outputting light traveling in a reverse direction to a main output terminal; And a distribution optical coupler for distributing the light output from the main output terminal of the optical circulator to each of the distribution channels.
According to the wavelength tunable optical filter and the optical sensor system using the wavelength tunable optical filter according to the present invention, the wavelength can be varied by using the linear wavelength tuning characteristic during the reaction time, which is an inherent characteristic of the electro-optical material, do. In addition, since it is possible to eliminate the inconvenience of using a wavelength locker that provides a reference wavelength in existing equipment in which wavelength offset occurs, and since there is no need for a separate device to secure wavelength accuracy, It is possible to simplify the manufacturing process. In addition, since the existing equipment is expensive, it is limited to applications where about 100 sensors can be utilized. However, since the present invention can be applied to small-sized sensor applications of less than 10, the application field is expanded.
1 is a view showing a wavelength tunable optical filter according to an embodiment of the present invention,
2 is a plan view of a light waveguide according to another embodiment of the present invention,
3 is a cross-sectional view of the optical waveguide of FIG. 2,
4 is a view showing a sensor system to which a wavelength tunable filter according to the present invention is applied.
Hereinafter, a wavelength tunable optical filter according to a preferred embodiment of the present invention and an optical sensor system using the same will be described in detail with reference to the accompanying drawings.
1 is a view showing a wavelength tunable optical filter according to an embodiment of the present invention.
Referring to FIG. 1, a tunable
The
The
As another example of the optical waveguide, the structure shown in Figs. 2 and 3 can be applied.
2 and 3, the
Here, the region corresponding to the
In this
On the other hand, a part of the
Here, the reaction time refers to the time at which the refractive index changes until the refractive index gradually changes from the initial refractive index before the application of the potential to a stable refractive index value corresponding to the applied potential, before reaching a stable refractive index value with respect to the applied potential.
Preferably, the electro-optical material to be applied to the optical waveguide is one selected from the group consisting of PMMA (poly-methylmethacrylate), Poly MSMA (alpha-methylstyrene-co-maleic anhydride), P2ANS, KH2PO4, NH4H2PO4, LiTaO3, Ti: LiNbO3 and LiNbO3 do.
The electric
The electric potential applied from the electric
The
Here, the first time is a potential applied to the electro-optical material forming the
The first time may be applied in consideration of the characteristics of the electro-optical material at 1 ns to 5 ms.
According to such a tunable
Hereinafter, a sensor system to which the tunable
4, the
In the following description, the
The
As an example, the
On / off driving of the
The optical distributor is adapted to receive light transmitted through or reflected by the wavelength tuning section of the
The
The
The distribution
The detecting
It is preferable that a 1x2 optical coupler is applied to the
The optical
The
The
The
In addition, the
On the other hand, when the optical waveguide of FIG. 2 is applied, the
Such a
110, 210; Optical waveguide 130: Electric pulse generating unit
150, 350:
Claims (9)
An electric pulse generator connected to the optical waveguide so as to apply a pulse potential to the optical waveguide;
And a controller for controlling driving of the electric pulse generator so that the pulse electric potential is applied for a first time set by the electric pulse generator,
Wherein the first time is a time until the wavelength of the light transmitted or reflected by the wavelength adjuster changes during the first period of time until the electrooptic material forming the clad is changed to a stable state at a refractive index corresponding to the applied electric potential Wherein the time-varying optical filter is applied with time.
A light source for introducing light into the core layer;
An electric pulse generator connected to the optical waveguide so as to apply a pulse potential to the optical waveguide;
A light distribution unit that receives light transmitted through or reflected by the wavelength adjusting unit and distributes the light to a plurality of distribution channels;
Optical fiber grating sensors corresponding to the distribution channels of the optical distributor;
A detection optical coupler connected to each of the distribution channels of the optical distributor and transmitting the incident light to the optical fiber grating sensor and outputting a signal traveling backward from the optical fiber grating sensor to a detection end;
A photodetector for detecting a signal received from a detection terminal of each of the optical couplers for detection;
And a controller for controlling the driving of the electric pulse generator so that the pulse potential is applied for a first time set by the electric pulse generator and processing the signal received by the optical detector,
Wherein the first time is a time until the wavelength of the light transmitted or reflected by the wavelength adjuster changes during the first period of time until the electrooptic material forming the clad is changed to a stable state at a refractive index corresponding to the applied electric potential Time is applied to the optical sensor system.
The light-
A photocoupler for injecting light emitted from the light source into the core layer and outputting light propagating in a direction opposite to that of the light reflected from the optical fiber grating to a main output;
And a distribution optical coupler for distributing the light output from the main output terminal of the optical circulator to each of the distribution channels.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020150191038A KR101670287B1 (en) | 2015-12-31 | 2015-12-31 | wavelength variable optical filter and optical sensor system using the same |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020150191038A KR101670287B1 (en) | 2015-12-31 | 2015-12-31 | wavelength variable optical filter and optical sensor system using the same |
Publications (1)
Publication Number | Publication Date |
---|---|
KR101670287B1 true KR101670287B1 (en) | 2016-11-09 |
Family
ID=57528887
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
KR1020150191038A KR101670287B1 (en) | 2015-12-31 | 2015-12-31 | wavelength variable optical filter and optical sensor system using the same |
Country Status (1)
Country | Link |
---|---|
KR (1) | KR101670287B1 (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005509919A (en) * | 2001-11-19 | 2005-04-14 | オプティヴァ インコーポレイテッド | Electro-optical device, electro-optical crystal thin film, and manufacturing method thereof |
KR20070092059A (en) * | 2006-03-08 | 2007-09-12 | 엘지전자 주식회사 | Optic modulator using a microring resonator and method of manufacturing the same |
-
2015
- 2015-12-31 KR KR1020150191038A patent/KR101670287B1/en active IP Right Grant
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005509919A (en) * | 2001-11-19 | 2005-04-14 | オプティヴァ インコーポレイテッド | Electro-optical device, electro-optical crystal thin film, and manufacturing method thereof |
KR20070092059A (en) * | 2006-03-08 | 2007-09-12 | 엘지전자 주식회사 | Optic modulator using a microring resonator and method of manufacturing the same |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US11243352B2 (en) | Polarization independent processing in integrated photonics | |
US6628850B1 (en) | Dynamic wavelength-selective grating modulator | |
US6271952B1 (en) | Polarization mode dispersion compensation | |
Burla et al. | Integrated waveguide Bragg gratings for microwave photonics signal processing | |
US20170248480A1 (en) | Serial weak fbg interrogator | |
US6597822B1 (en) | Multiplexable fiber-optic strain sensor system with temperature compensation capability | |
CN112740062A (en) | Optical sensor chip | |
GB2329960A (en) | Distributed sensing system | |
US20040052444A1 (en) | Multiplexable fiber-optic strain sensor system with temperature compensation capability | |
CN108254062A (en) | A kind of phase sensitive optical time domain reflection vibration detection device based on chaotic modulation | |
JP2021057613A (en) | Architecture for all-fiber delivery of coherently combined laser power | |
US8035888B2 (en) | Frequency shifter in an optical path containing a pulsed laser source | |
KR101670287B1 (en) | wavelength variable optical filter and optical sensor system using the same | |
RU2477838C1 (en) | Coherent optical reflectometer for detecting vibration action | |
CA2898142C (en) | Real-time non-linear optical strain gauge system | |
Guan et al. | Integrated optical orbital angular momentum multiplexing device using 3-D waveguides and a silica PLC | |
US10761352B1 (en) | Optical device | |
Xian et al. | Cladding mode coupling in a wide-band fiber Bragg grating and its application to a power-interrogated temperature sensor | |
Xiao et al. | An integrated silicon Bragg grating filter without circulator | |
Hodgson et al. | Large-scale interferometric fiber sensor arrays incorporating multiple optical switches | |
KR100838220B1 (en) | Optical CDMA Encoder Using Chirped Photonic Crystals | |
US11781888B2 (en) | Reflected light wavelength scanning device including silicon photonics interrogator | |
Mansurov et al. | Universal Fiber Optic Coupler/Sensor | |
Heron et al. | Brillouin loss based distributed temperature sensor using a single source | |
Jeong et al. | Novel Approach for Correlation Point Manipulation in Brillouin Optical Correlation Domain Analysis with Time Domain Data Processing |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
E701 | Decision to grant or registration of patent right | ||
GRNT | Written decision to grant | ||
FPAY | Annual fee payment |
Payment date: 20191014 Year of fee payment: 4 |