CN102323644A - Tunable filter based on rotary optical filter and filtering method thereof - Google Patents
Tunable filter based on rotary optical filter and filtering method thereof Download PDFInfo
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- CN102323644A CN102323644A CN201110272802A CN201110272802A CN102323644A CN 102323644 A CN102323644 A CN 102323644A CN 201110272802 A CN201110272802 A CN 201110272802A CN 201110272802 A CN201110272802 A CN 201110272802A CN 102323644 A CN102323644 A CN 102323644A
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Abstract
The invention relates to an optical device in the fields of optical communication, fiber sensing and the like, in particular to a tunable filter based on a rotary optical filter, which comprises an input fiber, an output fiber, a collimation lens, an optical filter and a reflector. The tunable filter is characterized by also comprising a rotating shaft, the optical filter is arranged on the rotating shaft and rotates under the drive of the rotating shaft, an included angle between the optical filter and the rotating shaft is between 0 DEG and 35 DEG, and the rotating shaft drives the optical fiber to rotate to ensure that the transmission wavelength of the optical fiber changes with the rotation. According to the invention, the wavelength transmitting the optical fiber is changed through rotating the optical fiber, thus tunable filtering function and good stability are achieved.
Description
Technical field
The present invention relates to be used for the optical devices in fields such as optical communication, Fibre Optical Sensor, be specifically related to a kind of tunable optic filter and filtering method thereof based on the rotating filtering sheet.
Background technology
Along with developing rapidly of optical communication; Flow increases; It is essential that the dynamic monitoring of network and adjustment are become, and the tunable optic filter of optical fiber I/O becomes a kind of very important optical device, and it can monitor light that what different wave lengths are arranged in the optical fiber luminous power at transmission and every kind of wavelength; Can also in optical fiber, switch different wavelengths, and the noise of filtering EDFA.
Equally at sensory field of optic fibre, be exactly measuring fiber grating reflection wavelength for the (FBG) demodulator core of fiber grating, use the combination of tunable optic filter and detector can be very convenient, check out the wavelength of grating exactly, thus the realization demodulation.
Traditional wave filter mainly adopts the structure (US0512746) of FFP; FP cavity configuration (US2004/0228575A1); Gradual change type filter sheet structure (US6606446B1); The structure of diffraction grating (US2008/0085119A1) is perhaps along being parallel to the structure (US7821712B2,49469467) that the optical filter rotating shaft comes the rotating filtering sheet.FFP and FP structural manufacturing process are very complicated, need retrofit, and temperature stability is also difficult to be carried out, and has only producer seldom to make both at home and abroad, and cost is very high; Gradual change type wave filter optical filter be difficult to be made, and conciliation speed is slow, and the structure bandwidth of diffraction grating is generally all than broad, and it is not very suitable using in fields such as sensings.
The structure of rotating filtering sheet is with low cost because of it, and narrow bandwidth becomes a very important techniques branch.But the tunable optic filter structure of spin filter sheet formation is to make filter plate along certain axle swing that is parallel to the optical filter surface before, generally about 20 degree, does reciprocating swing, is not continuous rotation, mechanism's complicacy of driving, and tuning speed is not high.
Summary of the invention
One of goal of the invention of the present invention is: the deficiency to above-mentioned prior art provides a kind of with low cost, narrow bandwidth, and a kind of tunable optic filter based on the rotating filtering sheet of continuous tuning.
Two of goal of the invention of the present invention is: the deficiency to above-mentioned prior art provides a kind of with low cost, narrow bandwidth, and a kind of tunable filtering method based on the rotating filtering sheet of continuous tuning.
For solving above technical matters, the present invention adopts following technical scheme:
A kind of tunable optic filter based on the rotating filtering sheet, it comprises input optical fibre, output optical fibre, collimation lens, optical filter, catoptron; Its difference is: also comprise a rotating shaft, said optical filter is installed in the rotating shaft and by its driven rotary, the angle of said optical filter and rotating shaft is spent between 35 degree 0, and rotating shaft drives optical filter and rotates and makes the filter plate transmission peak wavelength change thereupon.
By above scheme, said rotating shaft is rotated by driven by motor continuously, or adopts manually.
By above scheme, said motor is selected a kind of in stepper motor, the servomotor for use.
A kind of tunable filtering method based on the rotating filtering sheet; Its method may further comprise the steps: at first incident beam incides the light path from input optical fibre; Be incident to optical filter through behind the collimation lens collimation then, form the transmitted light beam of a certain wavelength after the optical filter outgoing, its difference is: said optical filter is arranged in the rotating shaft and by its driven rotary; When rotating shaft drives the optical filter rotation; The incident angle of incident beam changes thereupon, the corresponding change of transmission peak wavelength, and the angle of said optical filter and rotating shaft is spent between 35 degree 0.
By above scheme, said incident beam is the Gaussian beam behind directional light or the collimation, and between the 3mm, spend between 40 degree 0 by the angle between itself and the rotating shaft at 60um for beam diameter.
Ultimate principle of the present invention: incident beam incides the light path from input optical fibre; Through being incident to optical filter behind the collimation lens collimation, the optical filter outgoing forms the transmitted light beam of a certain wavelength then, and transmitted light beam is incident upon catoptron and after its reflection, turns back to optical filter along former road again; Seeing through optical filter light is afterwards once more assembled by collimation lens; From output optical fibre output, when rotating shaft drove the optical filter rotation, the incident angle of incident beam changed thereupon; The corresponding change of transmission peak wavelength realizes the tuning filtering function thereby promptly change the wavelength that sees through filter plate through the rotating filtering sheet.
The contrast prior art, useful technique effect of the present invention is following:
When the present invention uses, drive the angle of optical filter rotation just can change optical filter and light beam through rotating shaft, thereby change the transmitted light wavelength, and need be as the patent in the background technology, the reciprocally swinging optical filter.One of this structural advantages is more succinct, and is stable, overcome to-and-fro movement and had acceleration, and structural strength is required to compare problem of higher; Two of advantage is that the requirement of angle precision has reduced a lot, and originally the motion about to-and-fro movement 20 degree is amplified to 360 degree now, and accuracy requirement also can reduce greatly.
Description of drawings
Fig. 1 is a kind of tunable optic filter schematic diagram based on the rotating filtering sheet of the present invention;
Fig. 2 changes synoptic diagram for incident angle;
Fig. 3 is the optical filter principle of interference;
Fig. 4 is the schematic diagram of the embodiment of the invention 1.
Embodiment
Further specify the specific embodiment of the invention below in conjunction with accompanying drawing.
Like Fig. 1, shown in Figure 4, a kind of tunable optic filter based on the rotating filtering sheet, it comprise input optical fibre 4-1, output optical fibre 4-2, collimation lens 5, rotating shaft 3, one be installed in optical filter 2, the catoptron 6 in the rotating shaft 3; The angle of said optical filter 2 and rotating shaft 3 is spent between 35 degree 0, and rotating shaft 3 drives optical filter 2 rotations makes the transmission peak wavelength of filter plate 2 change thereupon.Optical filter 2 is installed in the rotating shaft 3, but is not orthogonal to rotating shaft, and incident beam 1-1 sees through optical filter 2 outgoing and forms transmitted light beam 1-2, also has an angle between light beam and the rotating shaft 3.Light incides in the light path from input optical fibre 4-1, and by lens 5 collimations, having only wavelength is that the light of λ t can pass rotatable optical filter 2, incides on the catoptron 6, and other light are reflected in the environment; Wavelength be the light of λ t after catoptron 6 reflection, Yan Yuanlu incides rotatable optical filter 2, because of incident angle identical; Can see through optical filter 2 equally; Light after seeing through is exported from output optical fibre 4-2 by lens 5 convergences, thereby has realized the function of tunable filtering.
Concrete, said rotating shaft 3 is rotated by driven by motor continuously, or adopts manually or stepper motor drives.
As shown in Figure 2, optical filter 2 is installed in the rotating shaft 3, but is not orthogonal to rotating shaft, and angle is θ, and incident beam 1-1 sees through the optical filter outgoing and forms transmitted light beam 1-2, and light beam and rotating shaft also have an included angle.
When rotating shaft rotated to angle ω=0, the incident angle of light was: i=φ-θ
When rotating shaft rotated to angle ω=180, the incident angle of light was: i=φ+θ
It is thus clear that incident angle has changed 2 θ, average incident angle is φ.
When ω was other angles, angle was in that (φ-θ) is to (change between the φ+θ).
As shown in Figure 3, optical filter is the multilayered interference film structure, and according to interference condition, transmission peak wavelength is proportional to incident cosine of an angle λ ∝ n*cos (i2).
When rotating shaft is rotated, wavelength can λ 0* (n1*cos (φ-θ)/n*cos (φ)) to λ 0* (n2*cos (φ+θ)/n*cos (φ)), between change.Wherein λ 0 is the transmission peak wavelength of optical filter when incident angle is φ.
In general, θ spends between 35 degree 0, and φ spends between 40 degree 0; Incident beam is the Gaussian beam behind directional light or the collimation.
Therefore when rotating shaft was rotated, the filter plate transmission peak wavelength changed thereupon, formed tunable optic filter.
Incident beam is the Gaussian beam behind directional light or the collimation, and between the 3mm, spend between 40 degree 0 by the angle between itself and the rotating shaft at 60um for beam diameter.
It is original 1/10 that the accuracy requirement of the preferred embodiment of the present invention can be reduced to, even lower.
Above content is to combine concrete embodiment to the further explain that the present invention did, and can not assert that practical implementation of the present invention is confined to these explanations.For the those of ordinary skill of technical field under the present invention, under the prerequisite that does not break away from the present invention's design, can also make some simple deduction or replace, all should be regarded as belonging to protection scope of the present invention.
Claims (5)
1. tunable optic filter based on the rotating filtering sheet, it comprises input optical fibre, output optical fibre, collimation lens, optical filter, catoptron; It is characterized in that: also comprise a rotating shaft, said optical filter is installed in the rotating shaft and by its driven rotary, the angle of said optical filter and rotating shaft is spent between 35 degree 0, and rotating shaft drives optical filter and rotates and makes the filter plate transmission peak wavelength change thereupon.
2. the tunable optic filter based on the rotating filtering sheet as claimed in claim 1 is characterized in that: said rotating shaft is rotated by driven by motor continuously, or adopts manually.
3. the tunable optic filter based on the rotating filtering sheet as claimed in claim 1 is characterized in that: said motor is selected a kind of in stepper motor, the servomotor for use.
4. tunable filtering method based on the rotating filtering sheet; Its method may further comprise the steps: at first incident beam incides the light path from input optical fibre; Be incident to optical filter through behind the collimation lens collimation then, form the transmitted light beam of a certain wavelength after the optical filter outgoing, it is characterized in that: said optical filter is arranged in the rotating shaft and by its driven rotary; When rotating shaft drives the optical filter rotation; The incident angle of incident beam changes thereupon, the corresponding change of transmission peak wavelength, and the angle of said optical filter and rotating shaft is spent between 35 degree 0.
5. the tunable filtering method based on the rotating filtering sheet as claimed in claim 4; It is characterized in that: said incident beam is the Gaussian beam behind directional light or the collimation; To between the 3mm, spend between 40 degree 0 by the angle between itself and the rotating shaft at 60um for beam diameter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201110272802.4A CN102323644B (en) | 2011-09-15 | 2011-09-15 | Tunable filter based on rotary optical filter and filtering method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110272802.4A CN102323644B (en) | 2011-09-15 | 2011-09-15 | Tunable filter based on rotary optical filter and filtering method thereof |
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| CN102323644A true CN102323644A (en) | 2012-01-18 |
| CN102323644B CN102323644B (en) | 2014-07-23 |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103033493A (en) * | 2012-12-10 | 2013-04-10 | 厦门大学 | Quantitative PCR (polymerase chain reaction) detection system for tunable fluorescent |
| CN105259632A (en) * | 2015-11-17 | 2016-01-20 | 江苏永信光学仪器有限公司 | Optical filtering device for lens bonding |
| CN106168576A (en) * | 2016-08-25 | 2016-11-30 | 青岛海纳光电环保有限公司 | A kind of gas analyser |
| CN106404700A (en) * | 2016-08-25 | 2017-02-15 | 青岛海纳光电环保有限公司 | Gas telemetering device |
| CN110007291A (en) * | 2019-04-16 | 2019-07-12 | 深圳市速腾聚创科技有限公司 | A kind of reception system and laser radar |
| CN110068540A (en) * | 2019-05-17 | 2019-07-30 | 重庆科技学院 | Adjustable wave spectrum generates instrument and its gas ingredients concentration detection system and method |
| CN111474130A (en) * | 2020-05-29 | 2020-07-31 | 南昌航空大学 | Simple device and method for on-line detection of gaseous propionaldehyde and acrolein based on spectrum method |
| CN113534353A (en) * | 2021-06-23 | 2021-10-22 | 桂林光隆集成科技有限公司 | Wavelength selective switch and debugging method |
| CN114812634A (en) * | 2022-04-19 | 2022-07-29 | 南京邮电大学 | Fiber grating wavelength demodulator |
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| CN1632633A (en) * | 2003-12-24 | 2005-06-29 | 招远招金光电子科技有限公司 | Low polarization-related loss optical filter with adjustable wavelength in a wide range |
| CN1996074A (en) * | 2006-12-18 | 2007-07-11 | 武汉光迅科技股份有限公司 | Tri-port depolarizing tunable optical filter based on TFF |
| CN201845127U (en) * | 2010-08-04 | 2011-05-25 | 福州高意通讯有限公司 | Adjustable filter |
| CN102081196A (en) * | 2010-12-27 | 2011-06-01 | 武汉光迅科技股份有限公司 | Two-port tunable TFF optical filter |
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Patent Citations (4)
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| CN1632633A (en) * | 2003-12-24 | 2005-06-29 | 招远招金光电子科技有限公司 | Low polarization-related loss optical filter with adjustable wavelength in a wide range |
| CN1996074A (en) * | 2006-12-18 | 2007-07-11 | 武汉光迅科技股份有限公司 | Tri-port depolarizing tunable optical filter based on TFF |
| CN201845127U (en) * | 2010-08-04 | 2011-05-25 | 福州高意通讯有限公司 | Adjustable filter |
| CN102081196A (en) * | 2010-12-27 | 2011-06-01 | 武汉光迅科技股份有限公司 | Two-port tunable TFF optical filter |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103033493A (en) * | 2012-12-10 | 2013-04-10 | 厦门大学 | Quantitative PCR (polymerase chain reaction) detection system for tunable fluorescent |
| CN103033493B (en) * | 2012-12-10 | 2015-08-05 | 厦门大学 | A kind of tunable fluorescence quantitative PCR detection system |
| CN105259632A (en) * | 2015-11-17 | 2016-01-20 | 江苏永信光学仪器有限公司 | Optical filtering device for lens bonding |
| CN106168576A (en) * | 2016-08-25 | 2016-11-30 | 青岛海纳光电环保有限公司 | A kind of gas analyser |
| CN106404700A (en) * | 2016-08-25 | 2017-02-15 | 青岛海纳光电环保有限公司 | Gas telemetering device |
| CN110007291A (en) * | 2019-04-16 | 2019-07-12 | 深圳市速腾聚创科技有限公司 | A kind of reception system and laser radar |
| CN110068540A (en) * | 2019-05-17 | 2019-07-30 | 重庆科技学院 | Adjustable wave spectrum generates instrument and its gas ingredients concentration detection system and method |
| CN110068540B (en) * | 2019-05-17 | 2022-04-22 | 重庆科技学院 | Detection method based on gas component concentration detection system |
| CN111474130A (en) * | 2020-05-29 | 2020-07-31 | 南昌航空大学 | Simple device and method for on-line detection of gaseous propionaldehyde and acrolein based on spectrum method |
| CN113534353A (en) * | 2021-06-23 | 2021-10-22 | 桂林光隆集成科技有限公司 | Wavelength selective switch and debugging method |
| CN114812634A (en) * | 2022-04-19 | 2022-07-29 | 南京邮电大学 | Fiber grating wavelength demodulator |
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Effective date of registration: 20190521 Address after: Room 2256, 2266-81, 2nd floor, E Block, Dongxin Road, Donghu New Technology Development Zone, Wuhan City, Hubei Province Patentee after: Wuhan Yu Guang Technology Co., Ltd. Address before: 430000 Block C 2 Unit 2007, 10 SBI Pioneer Street, Dongxin Road, Donghu Development Zone, Wuhan City, Hubei Province Patentee before: Wuhan Optogts Technology Co., Ltd. |
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