CN102323644B - 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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- CN102323644B CN102323644B CN201110272802.4A CN201110272802A CN102323644B CN 102323644 B CN102323644 B CN 102323644B CN 201110272802 A CN201110272802 A CN 201110272802A CN 102323644 B CN102323644 B CN 102323644B
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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 the optical devices for fields such as optical communication, Fibre Optical Sensors, be specifically related to a kind of tunable optic filter and filtering method thereof based on 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, the tunable optic filter of optical fiber I/O becomes a kind of very important optical device, it can be monitored has the light of how many different wave lengths in the luminous power of transmission and every kind of wavelength in optical fiber, can also in optical fiber, switch different wavelength, and the noise of filtering EDFA.
Equally at sensory field of optic fibre, for the (FBG) demodulator core of fiber grating, be exactly the reflection wavelength of measuring fiber grating, use the combination of tunable optic filter and detector can be very convenient, check out exactly the wavelength of grating, thereby realize demodulation.
Traditional wave filter mainly adopts the structure (US0512746) of FFP, FP cavity configuration (US2004/0228575A1), tapered optical filter structure (US6606446B1), the structure of diffraction grating (US2008/0085119A1), or along being parallel to the structure (US7821712B2,49469467) that optical filter rotating shaft carrys out rotating filtering sheet.FFP and FP structural manufacturing process are very complicated, need retrofit, and temperature stability is more difficult carrying out also, only have producer seldom to make both at home and abroad, and cost is very high; Gradual change type wave filter optical filter is difficult to manufacture, and conciliation speed is slow, and the structure bandwidth of diffraction grating is generally all wider, and it is not very suitable in fields such as sensings, using.
The structure of rotating filtering sheet is with low cost because of it, and narrow bandwidth becomes a very important technology branch.But the tunable optic filter structure that spin filter sheet forms is before the axle that makes filter plate be parallel to optical filter surface along certain to be swung, and generally in 20 degree left and right, does reciprocating swing, is not continuous rotation, and the mechanism of driving is complicated, and tuning speed is not high.
Summary of the invention
One of goal of the invention of the present invention is: for above-mentioned the deficiencies in the prior art, provide a kind of with low cost, narrow bandwidth, and a kind of tunable optic filter based on rotating filtering sheet of continuous tuning.
Two of goal of the invention of the present invention is: for above-mentioned the deficiencies in the prior art, provide a kind of with low cost, narrow bandwidth, and a kind of tunable filtering method based on 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 rotating filtering sheet, and it comprises input optical fibre, output optical fibre, collimation lens, optical filter, catoptron; It is characterized in that: also comprise a rotating shaft, described optical filter is arranged in rotating shaft and by its driven rotary, optical filter is not orthogonal to rotating shaft, the angle theta of described optical filter and rotating shaft between 35 degree, thereupon changes filter plate transmission peak wavelength thereby rotating shaft drives optical filter 360 degree rotations to rotate at 0 degree;
Incident beam sees through optical filter outgoing and forms transmitted light beam, and transmitted light beam and rotating shaft have an included angle; When rotating shaft rotates to angle ω=0 and spends, the incident angle of light is: i=φ-θ, when rotating shaft rotates to angle ω=180 and spends, the incident angle of light is: i=φ+θ, now incident angle has changed 2 θ, when ω is other angles, the incident angle of light is change between (φ-θ) to (φ+θ); The average incident angle of ω between 0-180 degree is φ;
Wherein, optical filter is multilayered interference film structure, and according to interference condition, transmission peak wavelength is proportional to incident cosine of an angle: λ ∝ n*cos (i), when rotating shaft is rotated, wavelength can be at λ
0* (n
1* cos (φ-θ)/n*cos (φ)) to λ
0* (n
2* change, wherein λ cos (φ+θ)/n*cos (φ))
0the transmission peak wavelength of optical filter when incident angle is φ.
By above scheme, described rotating shaft is by driven by motor continuous rotation, or employing manually.
By above scheme, described motor is selected a kind of in stepper motor, servomotor.
A kind of tunable filtering method of the tunable optic filter based on rotating filtering sheet based on described, its method comprises the following steps: first incident beam incides light path from input optical fibre, then after collimation lens collimation, be incident to optical filter, after optical filter outgoing, form the transmitted light beam of a certain wavelength, described optical filter is arranged in rotating shaft and by its driven rotary, when rotating shaft drives optical filter rotation, the incident angle of incident beam changes thereupon, the corresponding change of transmission peak wavelength, the angle of described optical filter and rotating shaft at 0 degree between 35 degree.
By above scheme, described incident beam is the Gaussian beam after directional light or collimation, beam diameter at 60 μ m between 3mm, the angle between itself and rotating shaft at 0 degree between 40 degree.
Ultimate principle of the present invention: incident beam incides light path from input optical fibre, then after collimation lens collimation, be incident to optical filter, optical filter outgoing forms the transmitted light beam of a certain wavelength, transmitted light beam be incident upon catoptron again through its reflection after Yan Yuan road turn back to optical filter, again see through optical filter light afterwards and be collimated lens convergence, from output optical fibre, export, when rotating shaft drives optical filter rotation, the incident angle of incident beam changes thereupon, the corresponding change of transmission peak wavelength, thereby by rotating filtering sheet, change through the wavelength of filter plate and realize tuning filtering function.
Contrast prior art, useful technique effect of the present invention is as follows:
When the present invention applies, by rotating shaft, drive optical filter rotation just can change the angle of optical filter and light beam, thereby change transmitted light wavelength, and do not need the patent in picture background technology, reciprocally swinging optical filter.One of this structural advantages is more succinct, stable, has overcome to-and-fro movement and has had acceleration, and structural strength is required to higher problem; Two of advantage is the requirement of angle precision to reduce a lot, and originally the motion of to-and-fro movement 20 degree left and right is amplified to 360 degree now, and accuracy requirement also can reduce greatly.
Accompanying drawing explanation
Fig. 1 is a kind of tunable optic filter schematic diagram based on rotating filtering sheet of the present invention;
Fig. 2 is that incident angle changes schematic diagram;
Fig. 3 is optical filter principle of interference;
Fig. 4 is the schematic diagram of the embodiment of the present invention 1.
Embodiment
Below in conjunction with accompanying drawing, further illustrate the specific embodiment of the invention.
As Figure 1 and Figure 4, a kind of tunable optic filter based on rotating filtering sheet, it comprise input optical fibre 4-1, output optical fibre 4-2, collimation lens 5, rotating shaft 3, one be arranged on optical filter 2, the catoptron 6 in rotating shaft 3; The angle of described optical filter 2 and rotating shaft 3 is at 0 degree between 35 degree, and rotating shaft 3 drives optical filter 2 rotations that the transmission peak wavelength of filter plate 2 is changed thereupon.Optical filter 2 is arranged in 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 rotating shaft 3.Light incides in light path from input optical fibre 4-1, by lens 5, is collimated, and only having wavelength is that the light of λ t can pass rotatable optical filter 2, incides on catoptron 6, and other light are reflected in 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 assembled by lens 5, from output optical fibre 4-2 output, thereby has realized the function of tunable filtering.
Concrete, described rotating shaft 3 is by driven by motor continuous rotation, or employing is manual or stepper motor drives.
As shown in Figure 2, optical filter 2 is arranged in rotating shaft 3, but is not orthogonal to rotating shaft, and angle is θ, and incident beam 1-1 sees through optical filter outgoing and forms transmitted light beam 1-2, and light beam and rotating shaft also have an included angle.
When rotating shaft rotates to angle ω=0, the incident angle of light is: i=φ-θ
When rotating shaft rotates to angle ω=180, the incident angle of light is: i=φ+θ
Visible incident angle has changed 2 θ, and average incident angle is φ.
When ω is other angles, angle is change between (φ-θ) to (φ+θ).
As shown in Figure 3, optical filter is multilayered interference film structure, and according to interference condition, transmission peak wavelength is proportional to incident cosine of an angle λ ∝ n*cos (i
2).
When rotating shaft is rotated, wavelength can be at λ
0* (n
1* cos (φ-θ)/n*cos (φ)) to λ
0* (n
2* change cos (φ+θ)/n*cos (φ)).λ wherein
0the transmission peak wavelength of optical filter when incident angle is φ.
In general, θ at 0 degree between 35 degree, φ at 0 degree between 40 degree; Incident beam is the Gaussian beam after directional light or collimation.
Therefore when rotating shaft is rotated, filter plate transmission peak wavelength changes thereupon, form tunable optic filter.
Optical filter 2 is narrow band pass filters, and its incident angle of light is different, and the wavelength seeing through is different;
Incident beam is the Gaussian beam after directional light or collimation, beam diameter at 60 μ m between 3mm, the angle between itself and rotating shaft at 0 degree between 40 degree.
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 in conjunction with concrete embodiment further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (5)
1. the tunable optic filter based on 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, described optical filter is arranged in rotating shaft and by its driven rotary, optical filter is not orthogonal to rotating shaft, the angle theta of described optical filter and rotating shaft between 35 degree, thereupon changes filter plate transmission peak wavelength thereby rotating shaft drives optical filter 360 degree rotations to rotate at 0 degree;
Incident beam sees through optical filter outgoing and forms transmitted light beam, and transmitted light beam and rotating shaft have an included angle; When rotating shaft rotates to angle ω=0 and spends, the incident angle of light is: i=φ-θ, when rotating shaft rotates to angle ω=180 and spends, the incident angle of light is: i=φ+θ, now incident angle has changed 2 θ, when ω is other angles, the incident angle of light is change between (φ-θ) to (φ+θ); The average incident angle of ω between 0-180 degree is φ;
Wherein, optical filter is multilayered interference film structure, and according to interference condition, transmission peak wavelength is proportional to incident cosine of an angle: λ ∝ n*cos (i), when rotating shaft is rotated, wavelength can be at λ
0* (n
1* cos (φ-θ)/n*cos (φ)) to λ
0* (n
2* change, wherein λ cos (φ+θ)/n*cos (φ))
0the transmission peak wavelength of optical filter when incident angle is φ.
2. the tunable optic filter based on rotating filtering sheet as claimed in claim 1, is characterized in that: described rotating shaft is by driven by motor continuous rotation, or employing manually.
3. the tunable optic filter based on rotating filtering sheet as claimed in claim 2, is characterized in that: described motor is selected a kind of in stepper motor, servomotor.
4. the tunable filtering method based on the tunable optic filter based on rotating filtering sheet claimed in claim 1, its method comprises the following steps: first incident beam incides light path from input optical fibre, then after collimation lens collimation, be incident to optical filter, after optical filter outgoing, form the transmitted light beam of a certain wavelength, described optical filter is arranged in rotating shaft and by its driven rotary, when rotating shaft drives optical filter rotation, the incident angle of incident beam changes thereupon, the corresponding change of transmission peak wavelength, the angle of described optical filter and rotating shaft at 0 degree between 35 degree.
5. tunable filtering method as claimed in claim 4, is characterized in that: described incident beam is the Gaussian beam after directional light or collimation, beam diameter at 60 μ m between 3mm, the angle between itself and rotating shaft at 0 degree between 40 degree.
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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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|---|---|---|---|
| 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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| CN102323644B true CN102323644B (en) | 2014-07-23 |
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| 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 |
| CN110007291B (en) * | 2019-04-16 | 2021-07-02 | 深圳市速腾聚创科技有限公司 | Receiving system and laser radar |
| 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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| 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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2011
- 2011-09-15 CN CN201110272802.4A patent/CN102323644B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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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. |