CN106772814A - A kind of tunable optical filter - Google Patents
A kind of tunable optical filter Download PDFInfo
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- CN106772814A CN106772814A CN201611185664.5A CN201611185664A CN106772814A CN 106772814 A CN106772814 A CN 106772814A CN 201611185664 A CN201611185664 A CN 201611185664A CN 106772814 A CN106772814 A CN 106772814A
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- optical signal
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
- G02B6/29304—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating by diffraction, e.g. grating
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/32—Optical coupling means having lens focusing means positioned between opposed fibre ends
Abstract
The invention discloses a kind of tunable optical filter, it is related to optic communication device technical field.The tunable optical filter includes：Double-fiber collimator, expand unit and wavelengthtunable selection component.Wherein, double-fiber collimator, for being collimated to wideband light source；Unit is expanded, for being expanded to wideband light source；Wavelengthtunable selects component, the selection for realizing the tunable wavelength based on MEMS.The present invention is the automatic adjustable high-quality optical filter of a kind of centre wavelength (frequency) realized based on MEMS (MEMS) technology, not only switch quick, flexible, and can apply to different workplaces, meet actually used demand.
Description
Technical field
The present invention relates to optic communication device technical field, in particular to a kind of tunable optical filter.
Background technology
Tunable optical filter is applied to DWDM (Dense Wavelength Division Multiplexing, intensity
Multiplexed optical wave use) it is composition ROADM (ROADM, Reconfigurable Optical Add- in system
Drop Multiplexer) elemental device.Functionally, tunable filter is a kind of wavelength (frequency) selector,
Can be from the input optical signal of many different frequencies, the optical signal that a specific wavelength (frequency) is selected as needed (reaches
To filter function).One superior in quality tunable optical filter should have degree high to accommodate more channels, narrow bandwidth to permit
Perhaps the advantages of channel spacing is small, Wavelength tunable adjusting range is wide, and with potential price advantage.
Along with developing rapidly for WDM (Wavelength Division Multiplexing, wavelength-division multiplex) technologies, can
The technology for dimming wave filter is also evolving, and is gradually improved.At present, the adjustable light wave-filter of appearance be based respectively on waveguide,
The technologies such as liquid crystal, fiber grating.But actually used middle discovery, existing above-mentioned tunable optical filter is respectively present following defect：
Wave filter based on waveguide has certain limitation at the flexible adjustable aspect of wavelength and bandwidth；Wave filter based on liquid crystal technology rings
It is long between seasonable, do not reach the requirement of communication system；Wave filter based on fiber grating due to more sensitive to temperature environment,
Therefore it is limited to workplace.
Therefore, how designing a kind of superior in quality tunable optical filter, to be that those skilled in the art are urgently to be resolved hurrily ask
Topic.
The content of the invention
It is to be based on the invention aims to overcome the shortcomings of above-mentioned background technology, there is provided a kind of tunable optical filter
The automatic adjustable high-quality optical filter of a kind of centre wavelength (frequency) that MEMS (MEMS) technology is realized, not only switches fast
It is fast, flexible, and can apply to different workplaces.
To achieve the above objectives, the present invention provides a kind of tunable optical filter, including double-fiber collimator, expand unit and
Wavelengthtunable selects component；The double-fiber collimator is used to collimate wideband light source, and the unit that expands is for width
Band light source is expanded, and the wavelengthtunable selection component is used to realize the selection of the tunable wavelength based on MEMS.Work as broadband
After light source enters tunable optical filter through the input of double-fiber collimator, double-fiber collimator is collimated simultaneously to wideband light source
Feeding expands unit；Expand after unit expands to wideband light source, the optical signal after expanding projects wavelengthtunable selection
In component；Wavelengthtunable is selected in the optical signal of different wave length of the component after expanding, and a certain wave is selected as needed
Optical signal long, and the optical signal of the specific wavelength after selection is back to expands unit；Expand the light letter that unit will be returned
In number returning to double-fiber collimator along light path；Double-fiber collimator is exported the optical signal by its output end.
On the basis of above-mentioned technical proposal, the expansion for expanding unit using two triangular prisms completions to wideband light source
Beam.
On the basis of above-mentioned technical proposal, the wavelengthtunable selection component includes a diffraction grating, a focusing
Lens, a MEMS micromirror and a linear motor for the horizontal movement being connected with MEMS micromirror；The diffraction grating is fixed
In expanding in the optical signal projected path after unit is expanded, the optical signal of its different wave length after expanding is thrown from different angles
It is incident upon on the condenser lens directly over it；The optical signal of different angle outgoing is projected to what is be positioned above by condenser lens
On MEMS micromirror；MEMS micromirror is moved under the drive of linear motor along horizontal direction, when MEMS micromirror is moved as needed
When to the optical signal for specific wavelength selected, the optical signal is reflected, the optical signal after reflection is along former light
Road returns, and realizes the tunable wavelength selection based on MEMS.
On the basis of above-mentioned technical proposal, the wavelengthtunable selection component includes a diffraction grating, a focusing
Lens, a MEMS micromirror and a rotation motor for circular motion, the rotation motor are located at diffraction grating and and diffraction
Grating is connected；The diffraction grating is located at and expands in the optical signal projected path after unit is expanded, the different wave length after expanding
Optical signal be projected to from different angles on the condenser lens directly over it；Condenser lens is by the light of different angle outgoing
Signal is projected to directly over it on MEMS micromirror of center；MEMS micromirror from condenser lens central area to projecting
A kind of optical signal of wavelength reflected；The diffraction grating rotates under the drive of rotation motor, when diffraction grating rotation
To the optical signal projected from condenser lens central area be it is selected go out a specific wavelength optical signal when, MEMS micromirror pair
The optical signal of the specific wavelength is reflected, and the optical signal after reflection is returned along original optical path, is realized tunable based on MEMS
Wavelength selection.
On the basis of above-mentioned technical proposal, the optical signal of the specific wavelength selected is：1530nm optical signals,
1550nm optical signals or 1570nm optical signals.
On the basis of above-mentioned technical proposal, the width of the MEMS micromirror is calculated in such a way：
1st, the line number for setting diffraction grating is d, and the focal length of condenser lens is f, and unit is all nm；The incidence angle of diffraction grating isThe angle of diffraction is θ；Grating equation such as formula is as follows：
In formula, m is diffraction time, and λ is the specific wavelength selected, and c is the light velocity, and v is right by the specific wavelength selected
The frequency answered；
2nd, diffraction time m=1 is taken, is obtained：
3rd, differential is carried out to formula (2), obtains the angular dispersion formula of grating：
4th, the width for setting the focal zone corresponding to the specific wavelength selected is l, and linear dispersion is obtained by angular dispersion formula
Formula：
5th, according to linear dispersion formula, the width D for being calculated MEMS micromirror (33) is：
In formula, △ V represent the frequency interval after derivation, and corresponding MEMS micromirror (33) is calculated by formula (5)
Width D.
On the basis of above-mentioned technical proposal, △ V selections are 50GHz or 100GHz.
On the basis of above-mentioned technical proposal, when MEMS micromirror is connected with linear motor, diffraction grating for be fixedly installed when,
The value of cos θ is in formula (5)：The cosine value of the diffraction angle corresponding to the optical signal of the specific wavelength selected.
On the basis of above-mentioned technical proposal, when MEMS micromirror is to be fixedly installed, when diffraction grating is connected with rotation motor,
The value of cos θ is in formula (5)：It is selected when diffraction grating is rotated to the optical signal projected from condenser lens central area
During the optical signal of the specific wavelength for going out, the cosine value of the now corresponding diffraction angle of the optical signal of the specific wavelength.
The beneficial effects of the present invention are：
In the present invention, wavelengthtunable selection component be based on MEMS (MEMS) technology come realize tunable wavelength choosing
The component selected.Compared with the wave filter for being based on guide technology or liquid crystal technology in the prior art, based on micro electro mechanical system (MEMS) technology
Tunable filter can realize the selection that is switched fast of specific wavelength, and operation is flexible；In addition, with the filtering based on fiber grating
Device is compared, and wavelengthtunable selection component of the invention is not especially sensitive to temperature environment, can not be limited by workplace, can be answered
For different workplaces, and then a kind of automatic adjustable optical filter of superior in quality centre wavelength (frequency) is realized,
Meet actually used demand.
Brief description of the drawings
Fig. 1 is the structural representation of the first embodiment of tunable optical filter of the present invention；
Fig. 2 is structural representation of the second embodiment of tunable optical filter of the present invention when it is 1530nm to select wavelength；
Fig. 3 is structural representation of the second embodiment of tunable optical filter of the present invention when it is 1550nm to select wavelength；
Fig. 4 is structural representation of the second embodiment of tunable optical filter of the present invention when it is 1570nm to select wavelength.
Reference：
1- double-fiber collimators；2- expands unit, 21- triangular prisms；3- wavelengthtunables selection component, 31- diffraction grating,
32- condenser lenses, 33-MEMS micro mirrors, 34- linear motors, 35- rotation motors.
Specific embodiment
The present invention is described in further detail below in conjunction with drawings and Examples.
Embodiment one：
Shown in Figure 1, the embodiment of the present invention provides a kind of tunable optical filter, including for carrying out standard to wideband light source
Straight double-fiber collimator 1, expand unit 2 for what is expanded to wideband light source, and realizing based on MEMS is tunable
The wavelengthtunable selection component 3 of wavelength selection.When wideband light source enters tunable optical filter through the input of double-fiber collimator 1
Afterwards, double-fiber collimator 1 is collimated and sent into wideband light source and expanded unit 2；Unit 2 is expanded to expand wideband light source
Afterwards, the optical signal after expanding is projected in wavelengthtunable selection component 3；Wavelengthtunable selects difference of the component 3 from after expanding
In the optical signal of wavelength, an optical signal for specific wavelength is selected as needed, and the light of the specific wavelength after selection is believed
Number it is back in expanding unit 2；Expand during the optical signal of return returns to double-fiber collimator 1 by unit 2 along light path；Double light
Fine collimater 1 is exported the optical signal by its output end, so as to reach filter function.
Specifically, it is shown in Figure 1, it is described to expand unit 2 using two triangular prisms 21 to complete in the present embodiment
Wideband light source is expanded.Also, wavelengthtunable selection component 3 include 31, condenser lens 32 of a diffraction grating,
One MEMS micromirror 33 and a linear motor for the horizontal movement being connected with MEMS micromirror 33 34.Wherein, diffraction grating 31
Be fixed on and expand in the optical signal projected path after unit 2 is expanded, its (diffraction grating 31) will expand after different wave length light
Signal is projected on the condenser lens 32 directly over it (this is the general principle of grating) from different angles；Condenser lens
32 are projected on the MEMS micromirror 33 above its (condenser lens 32) optical signal of different angle outgoing；MEMS micromirror 33
Moved along horizontal direction under the drive of linear motor 34, when MEMS micromirror 33 is moved to the spy for selecting as needed
When at standing wave optical signal long, the optical signal to the specific wavelength is reflected, and the optical signal after reflection is returned along original optical path
(i.e. condenser lens 32- diffraction grating 31- expands unit 2- double-fiber collimators 1), so as to realize tunable based on MEMS
Wavelength is selected.It is understood that the optical signal of the specific wavelength selected in the embodiment includes：1530nm optical signals,
1550nm optical signals and 1570nm optical signals.
Embodiment two：
Tunable optical filter is roughly the same with first embodiment in the present embodiment, and difference part is wavelengthtunable selection group
The structure setting of part 3.Referring to shown in Fig. 2 to Fig. 4, the selection component 3 of wavelengthtunable described in the present embodiment includes a diffraction light
The MEMS micromirror 33 of condenser lens 32, of grid 31, and a rotation motor for circular motion 35, the rotation motor 35
It is connected at diffraction grating 31 and with diffraction grating 31.Wherein, diffraction grating 31 is located at and expands the throwing of the optical signal after unit 2 is expanded
On rays footpath, the optical signal of the different wave length after expanding is projected to the condenser lens 32 directly over it from different angles
Upper (this is the general principle of grating)；Be projected to the optical signal of different angle outgoing positioned at its (condenser lens by condenser lens 32
32) directly on the MEMS micromirror 33 of center；33 pairs of light letters gone out from the center throw of condenser lens 32 of MEMS micromirror
Number reflected；Diffraction grating 31 rotates that (diffraction grating 31 when rotated, can change different ripples under the drive of rotation motor 35
Optical signal long is projected to the angle of condenser lens 32, so as to change the optical signal projected from the central area of condenser lens 32), when
The rotation of diffraction grating 31 to the optical signal projected from the central area of condenser lens 32 be it is selected go out a light for specific wavelength
During signal, the MEMS micromirror 33 pairs optical signal (it is selected go out specific wavelength optical signal) reflect, the light letter after reflection
Number along original optical path return (i.e. condenser lens 32- diffraction grating 31- expands unit 2- double-fiber collimators 1), so as to realize base
In the tunable wavelength selection of MEMS.
Other implementation process are identical with first embodiment in the present embodiment, and here is omitted.Furthermore it is possible to understand
Be, it is selected go out the optical signal of specific wavelength equally include：1530nm optical signals, 1550nm optical signals and 1570nm light letter
Number.
Further, when the width in the MEMS micromirror 33 in embodiment one and embodiment two is calculated, specifically may be used
In such a way：
1st, it is d to set the line number of diffraction grating 31, and the focal length of condenser lens 32 is f, and unit is all nm；The incidence angle of diffraction grating 31
ForThe angle of diffraction is θ (as shown in figs. 1 and 4)；Grating equation such as formula is as follows：
In formula, m is diffraction time, and λ is the specific wavelength selected, and c is the light velocity, and v is right by the specific wavelength selected
The frequency answered；
2nd, diffraction time m=1 is taken, is obtained：
3rd, differential is carried out to formula (2), obtains the angular dispersion formula of grating：
4th, because condenser lens and diffraction grating coordinate, angle dispersion is transformed into linear dispersion so that the light letter of different wave length
Number focus on different corresponding regions, then the width for setting the focal zone corresponding to the specific wavelength selected is l, by role
Scattered formula obtains linear dispersion formula：
5th, according to linear dispersion formula (4), the width D for being calculated MEMS micromirror 33 is：
In formula, △ V represent the frequency interval after derivation；For the channel width that existing ITU specifies, △ V may be selected to be
50GHz or 100GHz, then can be calculated the width D of corresponding MEMS micromirror 33 by above-mentioned formula (5).Furthermore it is possible to
Understand, it is actually used in, for filtering during different wavelength, width D has of different sizes in fact, but difference is not very
Greatly；Therefore, it is generally considered that selecting the width D that 1550nm wavelength is calculated the problems such as easy to use and cost, when actually used
Just it is applicable the light of 1530~1570nm.
Further, in embodiment one, because diffraction grating 31 is fixedly installed, therefore, diffraction grating 31
Incidence angleDiffraction angle is knowable fixed value, then in above-mentioned formula (5), cos θ are also knowable fixed value, are as selected
The cosine value of the diffraction angle corresponding to specific wavelength for going out.But in embodiment two, because diffraction grating 31 is rotary setting
, therefore, the incidence angle of diffraction grating 31Can change with the rotation of diffraction grating 31.Calculated when according to formula (5)
During the width D of MEMS micromirror 33, cos θ are that the optical signal projected from the central area of condenser lens 32 is selected specific wavelength
Optical signal when corresponding diffraction angle cosine value.
The present invention is not limited to the above-described embodiments, for those skilled in the art, is not departing from
On the premise of the principle of the invention, some improvements and modifications can also be made, these improvements and modifications are also considered as protection of the invention
Within the scope of.The content not being described in detail in this specification belongs to prior art known to professional and technical personnel in the field.
Claims (9)
1. a kind of tunable optical filter, it is characterised in that：Including double-fiber collimator (1), expand unit (2) and wavelengthtunable choosing
Select component (3)；, for being collimated to wideband light source, the unit (2) that expands is for broadband for the double-fiber collimator (1)
Light source is expanded, and the wavelengthtunable selects component (3) for realizing the selection of the tunable wavelength based on MEMS；
After wideband light source enters tunable optical filter through the input of double-fiber collimator (1), double-fiber collimator (1) is to width
Band light source is collimated and sent into expands unit (2)；Expand after unit (2) expands to wideband light source, the light after expanding
Signal is projected in wavelengthtunable selection component (3)；Wavelengthtunable selects the optical signal of different wave length of the component (3) from after expanding
In, an optical signal for specific wavelength is selected as needed, and the optical signal of the specific wavelength after selection is back to expands
In unit (2)；Expand during the optical signal of return returns to double-fiber collimator (1) by unit (2) along light path；Double fiber optic collimators
Device (1) is exported the optical signal by its output end.
2. tunable optical filter as claimed in claim 1, it is characterised in that：The unit (2) that expands uses two triangular prisms
Mirror (21) completes to expand wideband light source.
3. tunable optical filter as claimed in claim 1, it is characterised in that：The wavelengthtunable selects component (3) including one
What individual diffraction grating (31), a condenser lens (32), a MEMS micromirror (33) and one were connected with MEMS micromirror (33)
The linear motor (34) of horizontal movement；
The diffraction grating (31) is fixed on and is expanded in the optical signal projected path after unit (2) is expanded, its will expand after not
The optical signal of co-wavelength is projected on the condenser lens directly over it (32) from different angles；Condenser lens (32) will not
It is projected to the optical signal of angle outgoing on the MEMS micromirror (33) being positioned above；MEMS micromirror (33) is in linear motor (34)
Drive under along horizontal direction move, when MEMS micromirror (33) is moved to the light for specific wavelength selected as needed
When at signal, the optical signal is reflected, the optical signal after reflection is returned along original optical path, realized tunable based on MEMS
Wavelength selection.
4. tunable optical filter as claimed in claim 1, it is characterised in that：The wavelengthtunable selects component (3) including one
Individual diffraction grating (31), condenser lens (32), a MEMS micromirror (33) and a rotation motor for circular motion
(35), the rotation motor (35) is connected positioned at diffraction grating (31) place and with diffraction grating (31)；
The diffraction grating (31) positioned at expanding in the optical signal projected path after unit (2) is expanded, the different ripples after expanding
Optical signal long is projected on the condenser lens directly over it (32) from different angles；Condenser lens (32) is by different angles
The optical signal for spending outgoing is projected to directly over it on MEMS micromirror (33) of center；MEMS micromirror (33) is to from focusing
A kind of optical signal of wavelength that lens (32) central area projects is reflected；The diffraction grating (31) is in rotation motor
(35) rotated under drive, when diffraction grating (31) rotation to the optical signal projected from condenser lens (32) central area is selected
During the optical signal of the specific wavelength selected out, MEMS micromirror (33) is reflected the optical signal of the specific wavelength, after reflection
Optical signal returned along original optical path, realize the tunable wavelength selection based on MEMS.
5. the tunable optical filter as any one of Claims 1-4, it is characterised in that：The certain wave selected
Optical signal long is：1530nm optical signals, 1550nm optical signals or 1570nm optical signals.
6. the tunable optical filter as described in claim 3 or 4, it is characterised in that the width of the MEMS micromirror (33) according to
In the following manner is calculated：
1st, the line number for setting diffraction grating (31) is d, and the focal length of condenser lens (32) is f, and unit is all nm；Diffraction grating (31)
Incidence angle isThe angle of diffraction is θ；Grating equation such as formula is as follows：
In formula, m is diffraction time, and λ is the specific wavelength selected, and c is the light velocity, and v is corresponding to the specific wavelength selected
Frequency；
2nd, diffraction time m=1 is taken, is obtained：
3rd, differential is carried out to formula (2), obtains the angular dispersion formula of grating：
4th, the width for setting the focal zone corresponding to the specific wavelength selected is l, and linear dispersion formula is obtained by angular dispersion formula：
5th, according to linear dispersion formula, the width D for being calculated MEMS micromirror (33) is：
In formula, △ V represent the frequency interval after derivation, and the width of corresponding MEMS micromirror (33) is calculated by formula (5)
D。
7. tunable optical filter as claimed in claim 6, it is characterised in that：In formula (5), △ V selections for 50GHz or
100GHz。
8. tunable optical filter as claimed in claim 6, it is characterised in that：When MEMS micromirror (33) and linear motor (34) phase
Even, when diffraction grating (31) is to be fixedly installed, the value of cos θ is in formula (5)：The light letter of the specific wavelength selected
The cosine value of the diffraction angle corresponding to number.
9. tunable optical filter as claimed in claim 6, it is characterised in that：When MEMS micromirror (33) is to be fixedly installed, diffraction
When grating (31) is connected with rotation motor (35), the value of cos θ is in formula (5)：When diffraction grating (31) rotation is extremely from focusing
The optical signal that lens (32) central area is projected be it is selected go out specific wavelength optical signal when, the optical signal of the specific wavelength
The cosine value of now corresponding diffraction angle.
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| CN201611185664.5A CN106772814A (en) | 2016-12-20 | 2016-12-20 | A kind of tunable optical filter |
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| CN201611185664.5A CN106772814A (en) | 2016-12-20 | 2016-12-20 | A kind of tunable optical filter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108802901A (en) * | 2018-06-15 | 2018-11-13 | 华中科技大学 | A kind of multifunctional light electric system of flexible bandwidth |
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| CN102608708A (en) * | 2012-03-05 | 2012-07-25 | 华中科技大学 | Wavelength-adjustable optical filter |
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| CN103837936A (en) * | 2014-03-13 | 2014-06-04 | 上海理工大学 | Optical band-pass and notching filter with adjustable bandwidth and central wavelength |
| CN103969745A (en) * | 2013-01-30 | 2014-08-06 | 福州高意通讯有限公司 | Bandwidth-adjustable flat-top optical filter based on DLP |
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| JPH06188498A (en) * | 1992-12-17 | 1994-07-08 | Ishikawajima Harima Heavy Ind Co Ltd | Wavelength-tunable laser |
| EP0682278A1 (en) * | 1994-05-13 | 1995-11-15 | BRITISH TELECOMMUNICATIONS public limited company | Optical filter |
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| CN103969745A (en) * | 2013-01-30 | 2014-08-06 | 福州高意通讯有限公司 | Bandwidth-adjustable flat-top optical filter based on DLP |
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Application publication date: 20170531 |