CN102081196B - Two-port tunable TFF optical filter - Google Patents
Two-port tunable TFF optical filter Download PDFInfo
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- CN102081196B CN102081196B CN2010106095806A CN201010609580A CN102081196B CN 102081196 B CN102081196 B CN 102081196B CN 2010106095806 A CN2010106095806 A CN 2010106095806A CN 201010609580 A CN201010609580 A CN 201010609580A CN 102081196 B CN102081196 B CN 102081196B
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Abstract
The invention discloses a two-port tunable thin film filter (TFF) optical filter. The filter comprises a tunable optical filter unit, a wavelength detection unit and a control unit, wherein the tunable optical filter unit partially feeds input signal light back to the wavelength detection unit; the wavelength detection unit is connected with the tunable optical filter unit, detects the power change condition of the received signal light and outputs the condition to the control unit; and the control unit is connected with the wavelength detection unit, determines the drift condition of the central wavelength of output light through the power change condition of the output light of the wavelength detection unit, and corrects a tuning controller connected with the control unit. The filter has a simple structure and a built-in wavelength feedback structure and can completely eliminate influence caused by unstable light source power; symmetrical optical paths are adopted, so that all wavelengths and incident angles can completely compensate polarization mode dispersion caused by an optical path difference; the tuning performance of a device is improved; and the filter has the function of optical signal monitoring modules such as the Optical Society of America (OSA), an optical wavelength manager (OWM) and the like.
Description
Technical field
The present invention relates to a kind of tunable TFF optical filter.Particularly relate to a kind of being widely used in the dense wavelength division multiplexing system, or be used for optical wavelengthmeter, or be applied in the two-port adjustable light wave-filter in the light sensory field as the length scanning device.
Background technology
Adjustable light wave-filter is very crucial in an optical communication network device, and along with the increase of dense wave division multipurpose (DWDM) number of channel, tunable optic filter also just becomes a focus.Be used at present realize the technological more of adjustable light wave-filter, mainly contain multi-cavity TFF type, FP chamber type, acousto-optic adjustable type and micro annular resonant cavity type.Wherein, the unusual Bragg diffraction that the acousto-optic adjustable type utilizes surface acoustic wave (SAW) and light wave to interact and produce down can be realized filtering with Polarization Controller; When changing the SAW frequency; Leach wavelength and change thereupon, its tuned speed is fast, but manufacturing cost is high; Adjacent channel isolation is low, uses fewer in the engineering.Micro annular resonant cavity type is taked electrooptical modulation to change semiconductor refractive index usually and is realized wave length filtering, but it is bigger to export the light Insertion Loss at present, and tuning range is limited, and technology is also immature.FP chamber type general using piezoelectricity or mechanism such as micro electronmechanical are to chamber progress row minute adjustment; Its corresponding speed is fast; Also can realize the range of adjustment of broad, but in communication system, because the impossible absolute stability of optical source wavelength; Therefore generally require wave filter to have certain bandpass flatness, this then is very difficult for FP chamber type optical filter.With above-mentioned compared with techniques, it is good to realize that based on multi-cavity TFF technology tunable optic filter has an output spectrum rectangle degree, and adjacent channel isolation is high, tuning range big with the big advantage of environmental stability, obtained application widely.
Can know that by principle of interference phase differential satisfies following relational expression:
In the formula, λ
0Be initial wavelength; N is a medium refraction index in the chamber; D is an effective cavity length; θ is an incident angle, can be known by formula 1, and the factor that influences phase change has medium refraction index in incident angle, chamber length and the chamber.The scheme that changes medium refraction index in the chamber at present is mainly injection current in liquid crystal material, thereby changes the refractive index of liquid crystal molecule, and the TFF technology also is not suitable for this scheme.
Therefore, the general employing of present tunable multi-cavity interference thin film optical filter technology changes incident angle or changes the long dual mode in chamber, because the filter plate peak wavelength need satisfy:
2 π Ndcos θ/λ=m π (formula 2)
Wherein N is the effective refractive index of membraneous material, and to be light beam incide the refraction angle of membraneous material from air to θ, and m is an order of interference, and d is the physical thickness of rete.
Making the refractive index of air is 1, when light beam impinges perpendicularly on Thin Film Filter:
Δ λ=2N Δ d (formula 3)
The refractive index that makes air is 1, then can be got by refraction law:
Δ λ=λ
c-λ=cos θ ≈ 1-0.5 (θ/M)
2(formula 4)
Japan SANTEC company takes to change the long mode in chamber and changes the transmitted light wavelength, and is as shown in Figure 1, and it is coated with the multi-cavity film of different-thickness at the optical filter diverse location, utilizes horizontal push-pull fashion to realize tunable optical filtering; U.S. AFOP company adopts the mode that changes incident angle to change the transmitted light wavelength, and is as shown in Figure 2, and it proposes to use equal thickness multi-cavity Thin Film Filter, utilizes anglec of rotation mode to realize tunable optical filtering.The former major defect is that requirement can not have the angular deviation on the vertical direction, and the preparation to the non-uniform film optical filter simultaneously requires very high; The latter's major defect is not consider the influence of the light displacement of optical thin film and substrate generation to output collimator in the light path design, thereby requirement is very high to the requirement of the machining precision of mechanical parts.No matter adopt which kind of mode, the centre wavelength stability of output light is one of index of its most critical, takes the mode of open loop mechanical motion all to be difficult to meet the requirements of precision.
Except that above-mentioned two foreign patents, domestic Shandong recruited golden light electronics technology company limited to obtain a tunable optic filter patent (publication number CN1632633A) of authorizing in 2008, and like Fig. 3, it also is based on the rotation optical filter and realizes tunable filtering.Principal feature is to utilize plane mirror that optical filter is returned on the former road of transmission signal, has avoided light displacement that optical thin film and substrate the produced influence to output collimator.But owing to used a large amount of lens, half-wave plate and Faraday rotator etc. separate element, make that the realization of light path is very complicated, and increased the module loss that in this design, it equally also takes the mechanical mode of controlling of standard-sized sheet ring.
GuangXun Co., Ltd applied for the patent (number of patent application 200610019486 of three port adjustable filters of a based thin film interference filter technology in recent years; Like Fig. 4; This scheme principal feature is: changing a pair of film through stepper motor is that the homogeneous film optical filter of optimizing the parallel placement in back is realized adjustable light wave-filter; It is simple in structure, uses flexibly, and has improved the isolation of channel greatly through twin-stage filtering.But also there is a problem in this scheme, though design and optimize film system after the centre wavelength of optical filter two polarized lights the time than wide-angle incident to must be more accurate, thereby make Polarization Dependent Loss lower.But this scheme is owing to adopt two optical filters; Increased cost greatly; And along with the increasing of tuning angle, because the variation of two polarized light bandwidth, the polarized light segregation phenomenon can inevitably appear in transmitted light; This polarized light is separated to the filtering performance that to a certain degree can influence device, has limited the further expansion of tuning range.
In addition; GuangXun Co., Ltd is on the basis of proposition patent, in 2006 application and the tunable optic filter patents (patent No. 200610125495) of obtaining the authorization, its light path design such as Fig. 5; Principal feature is on above-mentioned patent basis, to have increased catoptrical output; Constituted a kind of adjustable light wave-filter of three ports, it uses collimating apparatus and circulator that transmitted light and reflected light signal are descended the road, eliminates Polarization Dependent Loss and polarized light segregation phenomenon; Tuning range can be bigger, and performance is better.Adopt catoptron to replace optical filter simultaneously, can practice thrift certain cost, in addition owing to the introducing of monitoring Tap/ photodetector and feedback control circuit, to the requirement reduction of mechanical part machining precision.
Yet; Because can there be certain upper-lower position drift owing to the pitch angle of optical filter is different in transmitted light beam; Therefore receiving collimating apparatus must and then move up and down (like Fig. 6); Increase very big difficulty with regard to the reception of giving optical signal transmissive like this, also just very high to the requirement on machining accuracy of corresponding mechanical parts.
Summary of the invention
Technical matters to be solved by this invention is, provides the rational light channel structure of a kind of employing to reduce Polarization Dependent Loss and reduce device cost, and is simple in structure, cost performance is high, use two-port adjustable light wave-filter flexibly.
The technical scheme that the present invention adopted is: a kind of two-port adjustable light wave-filter includes:
The adjustable light wave-filter unit, described adjustable light wave-filter unit includes: collimating apparatus collimates to normal optical; Thin Film Filter is positioned on the output light path of collimating apparatus, to the common light signal generating transmitted light first time through collimating device collimation; The total reflection right-angle prism; Be positioned on the output light path of Thin Film Filter; Be input on the Thin Film Filter after the transmitted light reflection with Thin Film Filter output, Thin Film Filter produces transmitted light for the second time, and described second time, transmitted light was through collimating apparatus output and get into the wavelength detection unit; Described Thin Film Filter is to be made up of equal thickness multi-cavity Thin Film Filter, and described Thin Film Filter is fixed on the rotation axis of stepper motor, and described stepper motor links to each other with control module, under the control of control module, drives the Thin Film Filter rotation;
The wavelength detection unit links to each other with the adjustable light wave-filter unit, detects received signal light power situation of change, and exports to control module;
Control module links to each other with the wavelength detection unit, and the situation of change of the Output optical power through the wavelength detection unit is judged output center wavelength of light drift situation, revises the stepper motor that links to each other with this control module then.
Described collimating apparatus is by 2 single core collimating apparatuss, or 1 twin-core collimating apparatus, or a single core collimating apparatus adds 1 three port circulator formation.
Described adjustable light wave-filter unit also includes: the input beam splitter, be positioned on the output light path of collimating apparatus, and export after will being decomposed into P light and S light through beam splitter through the normal optical signal of collimating device collimation; Input light half-wave plate; Be positioned on the output light path of input beam splitter; Wherein one road S light is exported to Thin Film Filter after rotating to be P light, and described Thin Film Filter produces transmission for the first time to the P light of input light half-wave plate output and the P light of input beam splitter output, the parallel P light of output two bundles; Output light half-wave plate is positioned on the reflected light path of Thin Film Filter, after wherein one road P light reverts to S light, exports; The output beam splitter is positioned on the S light output light path and another road of Thin Film Filter P reflection of light light path of output light half-wave plate, and two-way light is merged into the normal optical signal once more after collimating apparatus output and entering wavelength detection unit.
Described input beam splitter is to be made up of polarization beam apparatus with the output beam splitter.
Described input light half-wave plate, output light half-wave plate are to be made up of optically-active wave plate and faraday's revolving fragment.
Described wavelength detection unit includes: photo-coupler; Input end receives the part optical signals that the adjustable light wave-filter unit is exported; With this light signal beam split is two-way; One the tunnel directly outputs to control module through first photodetector, and another road outputs to control module through second photodetector after through F-P standard chamber again.
Described control module includes first data acquisition unit and second data acquisition unit that receives the two paths of signals of being exported the wavelength detection unit respectively; The microprocessor that links to each other with the output terminal of first data acquisition unit and second data acquisition unit respectively; And the motor driver that links to each other with the microprocessor output signal end; The stepper motor of the driving Thin Film Filter rotation in described motor driver and the adjustable light wave-filter unit links to each other; Send into microprocessor after the two paths of signals collection that described first data acquisition unit and second data acquisition unit are exported the wavelength detection unit; The signal that described microprocessor analysis received also is used to revise motor driver, thereby described Thin Film Filter is rotated under the control of control module.
Two-port adjustable light wave-filter of the present invention has the following advantages:
1. simple in structure, reduced module to the Thin Film Filter uniformity requirement.Used completely reflecting mirror to make the light path counter-rotating, two bundle polarized lights are the physical centre of inciding Thin Film Filter of symmetry all the time.In addition, owing to pass through Thin Film Filter once more after the transmitted light reflection, the optical signal filtering to single wavelength after twice filtering is more thorough, can better adjacent and non-adjacent isolation be provided for module.
2. the internal wavelength feedback arrangement utilizes two photodetectors to survey FP etalon front and back variable power situation respectively, can eliminate fully because the influence that the light source power instability is brought.Data acquisition unit is transferred to microprocessor analysis and is revised tuning controller after with information acquisition, has further improved tuning precision.
3. adopt symmetrical light path; Make through the two-beam behind the beam splitter respectively through a half-wave plate; P light; The light path that S light is passed by in whole optical path is basic identical, thereby realizes the polarization mode dispersion that all wavelengths and incident angle can both the full remuneration optical path difference be brought, and no longer needs extra wave plate to compensate.
4. become the parallel P light of 2 bundles through the general flashlight behind beam splitter and the half-wave plate; Polarization Dependent Loss and improvement film are that the rear polarizer center wavelength of light departs from and the bandwidth off-set phenomenon when efficiently solving wide-angle incident, make tuning range increase and improve the tuning performance of device greatly.In the present invention, C-band long wave, shortwave Polarization Dependent Loss are all less than 0.1dB.
5. be convenient to upgrading, in conjunction with DSP technology, film filtering technique, mechanical control technology, the present invention can possess optical monitoring signal functions of modules such as OSA, OWM.
Description of drawings
Fig. 1 is that Japanese SANTAC company is based on the long adjustable TFF Filter Structures synoptic diagram in chamber;
Fig. 2 is the TFF Filter Structures synoptic diagram of U.S. AFOP company based on adjustable angle;
Fig. 3 recruits the adjustable filter structure side view of golden light electronics technology company limited based on the low Polarization Dependent Loss of two-port of TFF technology;
Fig. 4 is the structural representation of GuangXun Co., Ltd based on the tunable optic filter of TFF technology;
Fig. 5 is the structural representation of GuangXun Co., Ltd based on three port tunable optic filters of TFF technology;
Fig. 6 is the transmitted light displacement diagram that optical filter causes after rotating to an angle;
Fig. 7 (1) is the TOF actual measurement long wave transmission spectrum according to the present invention's design;
Fig. 7 (2) is the TOF actual measurement shortwave transmission spectrum according to the present invention's design;
Fig. 8 is the structural representation of the built-in feedback wavelength of band of the present invention TOF embodiment;
Fig. 9 is the structural representation after the built-in feedback wavelength of the band of the present invention TOF optimal design.
Wherein,
1,8: single core collimating apparatus 2: the input beam splitter
3: input half-wave plate 4: optical filter
5: total reflection right-angle prism 6: the output half-wave plate
7: output beam splitter 9: coupling mechanism
11: the first photodetectors in 10:F-P standard chamber
13: the first data acquisition units of 12: the second photodetectors
Data acquisition unit 15 in 14: the second: microprocessor
16: motor driver 17: collimating apparatus
Embodiment
Below in conjunction with embodiment and accompanying drawing two-port adjustable light wave-filter of the present invention is made detailed description.
As shown in Figure 8, two-port adjustable light wave-filter of the present invention includes: adjustable light wave-filter unit A partly feeds back to the wavelength detection unit B with the flashlight of importing; The wavelength detection unit B, A links to each other with the adjustable light wave-filter unit, detects received signal light power situation of change, and exports to control module C; Control module C links to each other with the wavelength detection unit B, and the situation of change of the Output optical power through the wavelength detection unit B is judged output center wavelength of light drift situation, revises the tuning controller that links to each other with this control module C then.Wherein:
Described adjustable light wave-filter unit A includes: collimating apparatus 17 collimates to normal optical; Thin Film Filter 4 is positioned on the output light path of collimating apparatus 17, to the common light signal generating transmitted light first time through collimating apparatus 17 collimations; Total reflection right-angle prism 5; Be positioned on the output light path of Thin Film Filter 4; Be input on the Thin Film Filter 4 after the transmitted light reflection with Thin Film Filter 4 output, Thin Film Filter 4 produces transmitted lights for the second time, and described second time, transmitted light was through collimating apparatus 17 outputs and get into the wavelength detection unit B.Described collimating apparatus 17 is by 2 single core collimating apparatuss 1,8, or 1 twin-core collimating apparatus, or a single core collimating apparatus adds 1 three port circulator formation.The minute surface of total reflection right-angle prism 5 is vertical with the exit direction maintenance of incident light in 2 single core collimating apparatuss 1,8 all the time.
Described Thin Film Filter 4 is to be made up of equal thickness multi-cavity Thin Film Filter, and described Thin Film Filter 4 is fixed on the rotation axis of stepper motor, and described stepper motor links to each other with control module C, under the control of control module C, drives Thin Film Filter 4 rotations.
As shown in Figure 9; But the A optimization and upgrading of adjustable light wave-filter of the present invention unit is for also including: input beam splitter 2; Be positioned on the output light path of collimating apparatus 17, export after will being decomposed into P light and S light through beam splitter 2 through the normal optical signal of collimating apparatus 17 collimations; Input light half-wave plate 3; Be positioned on the output light path of input beam splitter 2; Wherein one road S light is exported to Thin Film Filter 4 after rotating to be P light; The P light of 4 pairs of inputs of described Thin Film Filter light half-wave plate, 3 outputs and the P light of input beam splitter 2 outputs produce transmission for the first time, the parallel P light of output two bundles; Output light half-wave plate 6 is positioned on the reflected light path of Thin Film Filter 4, after wherein one road P light reverts to S light, exports; Output beam splitter 7 is positioned on the S light output light path and Thin Film Filter 4 another road P reflection of light light paths of output light half-wave plate 6, and two-way light is merged into the normal optical signal once more after collimating apparatus 17 outputs and entering wavelength detection unit B.
Described input beam splitter 2 is to be made up of polarization beam apparatus with output beam splitter 7; Described input light half-wave plate 3, output light half-wave plate 6 are to be made up of optically-active wave plate and faraday's revolving fragment.
Like Fig. 8, shown in Figure 9; Described wavelength detection unit B constitutes the inside wavelength reference source; Include: photo-coupler 9, input end receives the light signal of adjustable light wave-filter unit A output, is two-way with this light signal beam split; One the tunnel directly outputs to control module C through first photodetector 11, and another road outputs to control module C through second photodetector 12 after through F-P standard chamber 10 again.
Described control module C includes first data acquisition unit 13 and second data acquisition unit 14 that receives the two paths of signals that the wavelength detection unit B exported respectively; The microprocessor 15 that links to each other with the output terminal of first data acquisition unit 13 and second data acquisition unit 14 respectively; And the motor driver 16 that links to each other with microprocessor 15 output signal ends, the stepper motor of driving Thin Film Filter 4 rotations among described motor driver 16 and the adjustable light wave-filter unit A links to each other.Send into microprocessor 15 after the two paths of signals collection that described first data acquisition unit 13 and second data acquisition unit 14 are exported the wavelength detection unit B; Described microprocessor 15 is through the situation of change of the Output optical power of collection wavelength detection unit; Analysis and judgement output center wavelength of light drift situation; And be used to revise motor driver 16, thus described Thin Film Filter 4 is rotated under the control of control module C, can make the optical filter output light wavelength reach very high precision prescribed.
Two-port adjustable light wave-filter of the present invention; Behind the input signal light process tunable optic filter unit; To partly export light by coupling mechanism and feed back to the wavelength detection unit, control module is judged output center wavelength of light drift situation through the situation of change of the Output optical power of collection wavelength detection unit; Revise tuning controller then, thereby make the optical filter output light wavelength reach very high precision prescribed.
The principle of work of two-port adjustable light wave-filter of the present invention:
(1) in the adjustable light wave-filter unit; The normal optical signal incides beam splitter after through collimating device collimation; Half-wave plate will be to export behind P light and the S light through the normal optical signal decomposition of collimating apparatus; One road S light obtains the parallel P light of two bundles after rotating to be P light to utilize half-wave plate to incite somebody to action wherein; Through Thin Film Filter transmission for the first time taking place, make two bundle P light light paths, two secondary reflections in the prism that is all-trans through total reflection right-angle prism secondary reflection again, returns in the light path; Two bundle P light interfere and transmission along opposite direction and Thin Film Filter once more, and last half-wave plate reverts to a branch of P light that will not wherein change polarization state and exported by the receiving end collimating apparatus after S light and other one road P light are merged into the normal optical signal once more.The present invention adopts the mode of angular modulation Thin Film Filter to regulate wavelength; The new light path of a kind of twice filtering such as Fig. 9 have been designed; Reflection through the polarized light light path realizes the device index optimization, can accept 20 degree incident angle oblique incidences and guarantee the filtering flat-top, thereby cover the whole C wave band.
(2) in the wavelength detection unit, a part gets into coupling mechanism behind the input signal light process tunable filtering unit, and coupling mechanism will be exported 2 photodetectors that light feeds back to front and back, F-P standard chamber respectively.The light signal that transmitted light use coupling mechanism is told 1%-10% is as the inside wavelength reference source; This light signal through making two photodetectors detect front and back, F-P standard chamber variable power situation respectively behind the three-dB coupler, accurately feeds back the output wavelength of two-port adjustable light wave-filter more thus.
(3) in control module, data acquisition unit is transferred to microprocessor analysis after with information acquisition, and microprocessor chip compensates the skew of output center wavelength of light automatically and revises motor driver according to algorithm, makes output light wavelength can reach high-precision requirement.
When the normal optical signal arrives beam splitter after collimating apparatus, beam splitter separates into parallel output behind P light and the S light with the polarization state of input optical signal.Half-wave plate is parallel to beam splitter, places the S light output end, the S polarization state of light is rotated to be P light, after the parallel P light of two-way arrives the uniform thickness thin-film interference filters,, leach the parallel P light of two-way of corresponding wavelength according to the Thin Film Filter anglec of rotation.The total reflection right-angle prism is placed perpendicular to two-way P light direction; And make 2 road P light through total reflection right-angle prism back reflection to Thin Film Filter; Because the Thin Film Filter angle of inclination is constant; So 2 road P light still can see through the Thin Film Filter outgoing to polarization beam apparatus, the P light that will not change polarization state this moment rotates to be S light through half-wave plate rear polarizer attitude, and receives by receiving collimating apparatus behind the P actinic light of another road.
In this light path, used polarization separation thought to realize the lower Polarization Dependent Loss of module, because P light and S light light path symmetry, module need not increase extra optical path compensation element.At last, utilize the prism that is all-trans to make transmitted wave pass through Thin Film Filter twice, improved the isolation of module greatly.When needs leach another road light signal, rotate Thin Film Filter through machinery control, the angle that promptly constantly changes incident light just can realize the tunable filtering of module.Wherein Thin Film Filter can realize that according to design demand the road up and down about about 96 channels selects, and can be implemented in the 506DWDM system whole C wave band tunable filtering of totally 96 tunnel single wavelength light signals.
Claims (7)
1. the tunable TFF optical filter of two-port is characterized in that, includes:
Adjustable light wave-filter unit (A), described adjustable light wave-filter unit (A) includes: collimating apparatus (17) collimates to normal optical; Thin Film Filter (4) is positioned on the output light path of collimating apparatus (17), to the common light signal generating transmitted light first time through collimating apparatus (17) collimation; Total reflection right-angle prism (5); Be positioned on the output light path of Thin Film Filter (4); Be input on the Thin Film Filter (4) after the transmitted light reflection with Thin Film Filter (4) output, Thin Film Filter (4) produces transmitted light for the second time, and described second time, transmitted light was respectively through collimating apparatus (17) output and get into wavelength detection unit (B); Described Thin Film Filter (4) is to be made up of equal thickness multi-cavity Thin Film Filter; Described Thin Film Filter (4) is fixed on the rotation axis of stepper motor, and described stepper motor links to each other with control module (C), under the control of control module (C), drives Thin Film Filter (4) rotation;
Wavelength detection unit (B), (A) links to each other with the adjustable light wave-filter unit, detects received signal light power situation of change, and exports to control module (C);
Control module (C), (B) links to each other with the wavelength detection unit, and the situation of change of the Output optical power through wavelength detection unit (B) is judged output center wavelength of light drift situation, revises the stepper motor that links to each other with this control module (C) then.
2. the tunable TFF optical filter of two-port according to claim 1 is characterized in that, described collimating apparatus (17) is by 2 single core collimating apparatuss (1,8), or 1 twin-core collimating apparatus, or a single core collimating apparatus adds 1 three port circulator formation.
3. the tunable TFF optical filter of two-port according to claim 1; It is characterized in that; Described adjustable light wave-filter unit (A) also includes: input beam splitter (2); Be positioned on the output light path of collimating apparatus (17), export after will being decomposed into P light and S light through beam splitter (2) through the normal optical signal of collimating apparatus (17) collimation; Input light half-wave plate (3); Be positioned on the output light path of input beam splitter (2); Wherein one road S light is exported to Thin Film Filter (4) after rotating to be P light; Described Thin Film Filter (4) produces transmission for the first time to the P light of input light half-wave plate (3) output and the P light of input beam splitter (2) output, the parallel P light of output two bundles; Output light half-wave plate (6) is positioned on the reflected light path of Thin Film Filter (4), after wherein one road P light reverts to S light, exports; Output beam splitter (7); Be positioned on the S light output light path and another road of Thin Film Filter (4) P reflection of light light path of output light half-wave plate (6), two-way light is merged into behind the normal optical signal respectively through collimating apparatus (17) output once more and got into wavelength detection unit (B).
4. the tunable TFF optical filter of two-port according to claim 3 is characterized in that, described input beam splitter (2) and output beam splitter (7) are to be made up of polarization beam apparatus.
5. the tunable TFF optical filter of two-port according to claim 3 is characterized in that, described input light half-wave plate (3), output light half-wave plate (6) are to be made up of optically-active wave plate and faraday's revolving fragment.
6. the tunable TFF optical filter of two-port according to claim 1; It is characterized in that; Described wavelength detection unit (B) includes: photo-coupler (9), and input end receives the light signal that the Thin Film Filter (4) in the adjustable light wave-filter unit (A) is exported, and is two-way with this light signal beam split; One the tunnel directly outputs to control module (C), and another road outputs to control module (C) after through F-P standard chamber (10).
7. the tunable TFF optical filter of two-port according to claim 1; It is characterized in that; Described control module (C) includes first data acquisition unit (13) and second data acquisition unit (14) that receives the two paths of signals of being exported wavelength detection unit (B) respectively; The microprocessor (15) that links to each other with the output terminal of first data acquisition unit (13) and second data acquisition unit (14) respectively; And the motor driver (16) that links to each other with microprocessor (15) output signal end; The stepper motor of driving Thin Film Filter (4) rotation among described motor driver (16) and adjustable light wave-filter unit (A) links to each other; Send into microprocessor (15) after the two paths of signals collection that described first data acquisition unit (13) and second data acquisition unit (14) are exported wavelength detection unit (B), the signal that described microprocessor (15) analysis is received also is used to revise motor driver (16), thereby described Thin Film Filter (4) is rotated under the control of control module (C).
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| CN102269910A (en) * | 2011-07-15 | 2011-12-07 | 武汉理工光科股份有限公司 | Wavelength demodulation system and method for optical grating by using angle tuning filter |
| CN102323644B (en) * | 2011-09-15 | 2014-07-23 | 武汉朗睿科技有限公司 | Tunable filter based on rotary optical filter and filtering method thereof |
| CN105572914A (en) * | 2016-02-25 | 2016-05-11 | 昂纳信息技术（深圳）有限公司 | Adjustable optical filter of optical system |
| CN114812634A (en) * | 2022-04-19 | 2022-07-29 | 南京邮电大学 | Fiber grating wavelength demodulator |
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| US6842559B1 (en) * | 2002-01-18 | 2005-01-11 | Raytheon Company | Method and apparatus for adding or dropping a component of an optical signal |
| US6909549B1 (en) * | 2002-03-08 | 2005-06-21 | Yung-Chieh Hsieh | Tunable filter for optical add/drop module |
| US20040091213A1 (en) * | 2002-11-08 | 2004-05-13 | Tsung-Kai Chuang | Optical calibrating method |
| 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 |
| US20070071040A1 (en) * | 2004-09-29 | 2007-03-29 | Axsun Technologies, Inc. | Method and System for Noise Control in Semiconductor Spectroscopy System |
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