CN204086700U - A kind of different-bandwidth optics comb filter - Google Patents
A kind of different-bandwidth optics comb filter Download PDFInfo
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- CN204086700U CN204086700U CN201420473001.3U CN201420473001U CN204086700U CN 204086700 U CN204086700 U CN 204086700U CN 201420473001 U CN201420473001 U CN 201420473001U CN 204086700 U CN204086700 U CN 204086700U
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Abstract
The utility model proposes a kind of different-bandwidth optics comb filter, comprise optical splitter, three mirror GT chambeies, mirror GT chamber one, three two, glass compensating plate, collimating apparatus one, collimating apparatus two, by selecting suitable glass compensating plate to adjust optical path difference, thus reach the object of high efficiency, low cost.
Description
Technical field
The utility model relates to fiber optic communication field, particularly a kind of different-bandwidth optics comb filter of high efficiency, low cost.
Background technology
The existing Asymmetric interleaver that realizes comprises Michelson three mirror GT lumen type, coupling mechanism cascade connection type, birefringence fiber ring mirror-type etc.Michelson three mirror GT lumen type comb filter utilizes three mirror GT chambeies to realize the phase modulation of light signal, obtained to interfere by Michelson interferometer and export, and the pectination wave form output of different-bandwidth is obtained by the thickness of the length and GT chamber that control two interference arms, the thickness and two that the shortcoming of this structure is to control accurately three mirror GT chambeies interferes the relation of arm optical path difference.Coupling mechanism cascade connection type comb filter by different splitting ratio coupling mechanism with have the interference arm cascade of time delay to form, the two interference arms different by cascade light path carry out phase modulation, and finally realized interfering output by coupling mechanism, interfere the optical path difference of arm can realize the pectination wave form output of different-bandwidth by controlling each cascade, the shortcoming of this structure is that the coupling mechanism quantity needed is more, and parameter request is relatively stricter, causes device volume bigger than normal, and production cost relative difficulty.Birefringence fiber ring mirror-type comb filter is made up of three-dB coupler, birefringence fiber, Polarization Controller and optical circulator, the two-beam that three-dB coupler exports produces phase differential through two sections of birefringence fibers and two Polarization Controllers, thus interfere at three-dB coupler place, the pectination wave form output of different-bandwidth can be realized by the length controlling birefringence fiber, the shortcoming of this structure is due to Polarization Controller angular error, the coupling accuracy errors etc. of two sections of birefringence fiber length, easily causes the instability of output spectrum.
Utility model content
The utility model is intended at least to solve one of technical matters existed in prior art.For this reason, the utility model proposes a kind of different-bandwidth optics comb filter, comprising optical splitter, three mirror GT chambeies, mirror GT chamber one, three two, glass compensating plate, collimating apparatus one, collimating apparatus two, by selecting suitable glass compensating plate to adjust optical path difference, thus reaching the object of high efficiency, low cost.
In order to realize above-mentioned technique effect, concrete technical scheme is:
A kind of different-bandwidth optics comb filter, comprising: optical splitter; Three mirror GT resonator cavitys one, comprise catoptron one, catoptron two, catoptron three, described catoptron one is placed in the reflected light side of described optical splitter, and the normal of described catoptron one and described optical splitter angled, described catoptron two is placed in the back side of described catoptron one, and the normal of described catoptron two parallels with the normal of described catoptron one, described catoptron three is placed in the back side of described catoptron two, and the normal of described catoptron three parallels with the normal of described catoptron two; Three mirror GT resonator cavitys two, comprise catoptron four, catoptron five, catoptron six, described catoptron four is placed in the transmitted light side of described optical splitter, and the normal of described catoptron four and described optical splitter angled, described catoptron five is placed in the back side of described catoptron four, and the normal of described catoptron five parallels with the normal of described catoptron four, described catoptron six is placed in the back side of described catoptron five, and the normal of described catoptron six parallels with the normal of described catoptron five; Glass compensating plate, comprise glass sheet one, glass sheet two, glass sheet three, glass sheet four, be placed in cavity that described optical splitter and catoptron one formed described glass sheet one adjustable angle, be placed in cavity that described catoptron two and catoptron three formed described glass sheet two adjustable angle, described glass sheet three angle is adjustably placed in the cavity that described optical splitter and catoptron four formed, and described glass sheet four angle is adjustably placed in the cavity that described catoptron five and catoptron six formed; Collimating apparatus one, described collimating apparatus one is arranged at the side of described optical splitter, and the normal of described collimating apparatus one and described optical splitter angled; Collimating apparatus two, described collimating apparatus two is arranged at the opposite side of described optical splitter, and the normal of described collimating apparatus two and described optical splitter angled.
Preferred as such scheme, the optical path difference that the deflection angle of described glass sheet one, glass sheet two, glass sheet three, glass sheet four causes with it all meets following formula:
the wherein optical path difference of Δ d caused by glass sheet angular deflection; N is glass sheet refractive index; θ
0for the deflection angle of glass sheet, i.e. the normal of glass sheet and horizontal direction angulation; D is the thickness of glass sheet.
Preferred as such scheme, the thickness range of described glass sheet one, glass sheet two, glass sheet three, glass sheet four is 150 μm-380 μm.
Preferred as such scheme, the reflectivity of described catoptron one and catoptron four is 0.05%-0.1%, and the reflectivity of described catoptron two and catoptron five is 30%-35%, and the reflectivity of described catoptron three and catoptron six is 99.8%-99.98%.
Preferred as such scheme, the refractive index of described glass sheet one, glass sheet two, glass sheet three, glass sheet four is 1.44, and the thickness of described glass sheet one is 150 μm, and glass sheet two thickness is 280 μm, glass sheet three thickness is 160 μm, and glass sheet four thickness is 295 μm.
Accompanying drawing explanation
Fig. 1 is the theory structure schematic diagram of a kind of different-bandwidth optics comb filter that the utility model provides;
Fig. 2 is the definition schematic diagram that glass sheet deflection retrodeviates corner;
Fig. 3 is the graph of relation of glass sheet deflection angle and optical path difference;
Fig. 4 is the output waveform figure of a kind of Asymmetric interleaver that the utility model provides.
Embodiment
Be described below in detail embodiment of the present utility model, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Being exemplary below by the embodiment be described with reference to the drawings, only for explaining the utility model, and can not being interpreted as restriction of the present utility model.
In description of the present utility model, it will be appreciated that, orientation or the position relationship of the instruction such as term " " center ", " on ", D score, "front", "rear", "left", "right", " vertically ", " level ", " top ", " end " " interior ", " outward " they be based on orientation shown in the drawings or position relationship; be only the utility model and simplified characterization for convenience of description; instead of instruction or imply the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore can not be interpreted as restriction of the present utility model.
In description of the present utility model, it should be noted that, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or connect integratedly; Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals.For the ordinary skill in the art, concrete condition the concrete meaning of above-mentioned term in the utility model can be understood.
As shown in Figure 1, the utility model provides a kind of different-bandwidth optics comb filter, comprising:
(1) optical splitter 1, described optical splitter adopts quartz or other optical glass to do substrate, and in substrate, be coated with the film of 50:50 splitting ratio;
(2) three mirror GT resonator cavitys one, comprise catoptron 1, catoptron 2 202, catoptron 3 203, described catoptron one is placed in the reflected light side of described optical splitter, and the normal of described catoptron one and described optical splitter angled, described catoptron two is placed in the back side of described catoptron one, and the normal of described catoptron two parallels with the normal of described catoptron one, described catoptron three is placed in the back side of described catoptron two, and the normal of described catoptron three parallels with the normal of described catoptron two, the reflectivity of described catoptron one is 0.1% or 0.05%, the reflectivity of described catoptron two is 30% or 35%, the reflectivity of described catoptron three is 99.8%, light path between adjacent mirror can be selected according to channel spacing, and when channel spacing is 50GHz, the optical path difference between described catoptron one and catoptron two is 1.5mm, and the optical path difference between described catoptron two and catoptron three is 1.5mm,
(3) three mirror GT resonator cavitys two, comprise catoptron 4 301, catoptron 5 302, catoptron 6 303, described catoptron four is placed in the transmitted light side of described optical splitter, and the normal of described catoptron four and described optical splitter angled, described catoptron five is placed in the back side of described catoptron four, and the normal of described catoptron five parallels with the normal of described catoptron four, described catoptron six is placed in the back side of described catoptron five, and the normal of described catoptron six parallels with the normal of described catoptron five, the reflectivity of described catoptron four is 0.1% or 0.05%, the reflectivity of described catoptron five is 30% or 35%, the reflectivity of described catoptron six is 99.8%, light path between adjacent mirror can be selected according to channel spacing, and when channel spacing is 50GHz, the optical path difference between described catoptron four and catoptron five is 1.5mm, and the optical path difference between described catoptron five and catoptron six is 1.5mm,
(4) glass compensating plate, comprise glass sheet 1, glass sheet 2 402, glass sheet 3 403, glass sheet 4 404, be placed in cavity that described optical splitter and catoptron one formed described glass sheet one adjustable angle, be placed in cavity that described catoptron two and catoptron three formed described glass sheet two adjustable angle, described glass sheet three angle is adjustably placed in the cavity that described optical splitter and catoptron four formed, and described glass sheet four angle is adjustably placed in the cavity that described catoptron five and catoptron six formed; The optical path difference that the deflection angle of described glass sheet one, glass sheet two, glass sheet three, glass sheet four causes with it all meets following formula:
the wherein optical path difference of Δ d caused by glass sheet angular deflection; N is glass sheet refractive index; θ
0for the deflection angle of glass sheet, as shown in Figure 2, i.e. the normal of glass sheet and horizontal direction angulation; D is the thickness of glass sheet; The refractive index of described glass sheet one, glass sheet two, glass sheet three, glass sheet four is 1.44, the thickness of described glass sheet one is 150 μm, glass sheet two thickness is 280 μm, glass sheet three thickness is 160 μm, glass sheet four thickness is 295 μm, and described glass sheet one, glass sheet two, glass sheet three, glass sheet four can adopt quartz glass plate; Fig. 3 is the graph of relation of glass sheet deflection angle and optical path difference;
(5) collimating apparatus 1, described collimating apparatus one is arranged at the side of described optical splitter, and the normal of described collimating apparatus one and described optical splitter angled, described collimating apparatus one is optical fiber collimator, and the angle that described collimating apparatus one becomes with optical splitter can adopt 45 degree or 42 degree or 48 degree;
(6) collimating apparatus 26, described collimating apparatus two is arranged at the opposite side of described optical splitter, and the normal of described collimating apparatus two and described optical splitter angled, described collimating apparatus two is optical fiber collimator.
The principle of work of a kind of different-bandwidth optics comb filter provided by the utility model is: be divided into two-beam E1, E2 when multi-wavelength signals becomes through collimating apparatus one device that to be split after directional light.Light beam E1 is via catoptron one, catoptron two, the three mirror GT resonator cavity one phase modulation Hou Yanyuan roads that catoptron three is formed return optical splitter, another road light beam E2 is via catoptron four, catoptron five, the three mirror GT resonator cavity two phase modulation Hou Yanyuan roads that catoptron six is formed return optical splitter, the intersection of two-way back light on optical splitter interferes, by selecting the glass sheet one that thickness is suitable, glass sheet two, glass sheet three, glass sheet four, the angle of finely tuning the insertion of each glass sheet realizes the adjustment interfering arm length difference and GT chamber thickness, thus change optical path difference, and then obtain the comb filtering signal of different-bandwidth, one road odd-numbered channels wavelength channels Etrans is coupled to collimating apparatus one, another road even channel wavelength light signal Eref is coupled to collimating apparatus two, thus achieve light beam letter (λ 1, λ 2, λ 3, λ 4, λ 5, λ 6, λ 7, λ 8, ) divide into odd number wavelength (λ 1, λ 3, λ 5, λ 7, ) and even number wavelength (λ 2, λ 4, λ 6, λ 8, ) two-beam signal, channel spacing is made to become original twice, otherwise also two bundle odd number wavelength channels can be closed ripple with even number wavelength channels and become light beam signal.
The output waveform figure of the Asymmetric interleaver that Fig. 4 provides for the utility model.In figure, solid line represents the output bandwidth of the zone of reflections, and its three dB bandwidth is 68GHz, and the pass due to optimum bandwidth f and transfer rate v is f≤1.5v, and therefore it can be used for the signal that transmission speed is 40Gbit/s.Dotted line represents the output bandwidth of transmission bands, and its three dB bandwidth is 32GHz, and it can be used for the signal that transmission speed is 10Gbit/s.
Compared with traditional Michelson three mirror GT chamber comb filter, the utility model achieves the long adjustment with interfering arm length difference in chamber, GT chamber by the mode arranging suitable glass sheet, thus reach the precise fine-adjustment of optical path difference, because optical path difference fine setting needs the thickness of glass sheet to be some tens of pm, and the glass sheet difficulty of industrial processes some tens of pm magnitude is very large, accuracy is made also to be difficult to ensure.Therefore the utility model inserting thickness in four chambeies is the glass sheet between 150 μm-380 μm, and realized the effect of some tens of pm by the thickness difference of four glass sheet, this structure effectively solves the processing difficulties problem of tens of microns thickness thin glass sheet.In addition, contrast coupling mechanism cascade connection type comb filter and birefringence fiber ring mirror-type comb filter, the utility model has compact structure and stable performance more.
The utility model provides a kind of different-bandwidth optics comb filter, make device volume less by Michelson interference structure, Signal segregation degree is higher, channel flatness is better, phase modulation can be carried out to light wave by the reflection coefficient in each reflection horizon controlling thrihedral reflector, and then the signal realizing different bandwidth exports, and is carried out the compensation of optical path difference by the mode inserting the glass sheet of different-thickness in chamber, thus ensure the drifting within specialized range of centre frequency.This different-bandwidth optics comb filter can be widely used in wavelength-division multiplex system, optical add/drop multiplexer in optical communication.
In the description of this instructions, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present utility model or example.In this manual, identical embodiment or example are not necessarily referred to the schematic representation of above-mentioned term.And the specific features of description, structure, material or feature can combine in an appropriate manner in any one or more embodiment or example.
Although illustrate and described embodiment of the present utility model, those having ordinary skill in the art will appreciate that: can carry out multiple change, amendment, replacement and modification to these embodiments when not departing from principle of the present utility model and aim, scope of the present utility model is by claim and equivalents thereof.
Claims (5)
1. a different-bandwidth optics comb filter, is characterized in that, comprising:
Optical splitter;
Three mirror GT resonator cavitys one, comprise catoptron one, catoptron two, catoptron three, described catoptron one is placed in the reflected light side of described optical splitter, and the normal of described catoptron one and described optical splitter angled, described catoptron two is placed in the back side of described catoptron one, and the normal of described catoptron two parallels with the normal of described catoptron one, described catoptron three is placed in the back side of described catoptron two, and the normal of described catoptron three parallels with the normal of described catoptron two;
Three mirror GT resonator cavitys two, comprise catoptron four, catoptron five, catoptron six, described catoptron four is placed in the transmitted light side of described optical splitter, and the normal of described catoptron four and described optical splitter angled, described catoptron five is placed in the back side of described catoptron four, and the normal of described catoptron five parallels with the normal of described catoptron four, described catoptron six is placed in the back side of described catoptron five, and the normal of described catoptron six parallels with the normal of described catoptron five;
Glass compensating plate, comprise glass sheet one, glass sheet two, glass sheet three, glass sheet four, be placed in cavity that described optical splitter and catoptron one formed described glass sheet one adjustable angle, be placed in cavity that described catoptron two and catoptron three formed described glass sheet two adjustable angle, described glass sheet three angle is adjustably placed in the cavity that described optical splitter and catoptron four formed, and described glass sheet four angle is adjustably placed in the cavity that described catoptron five and catoptron six formed;
Collimating apparatus one, described collimating apparatus one is arranged at the side of described optical splitter, and the normal of described collimating apparatus one and described optical splitter angled;
Collimating apparatus two, described collimating apparatus two is arranged at the opposite side of described optical splitter, and the normal of described collimating apparatus two and described optical splitter angled.
2. different-bandwidth optics comb filter according to claim 1, is characterized in that, the optical path difference that the deflection angle of described glass sheet one, glass sheet two, glass sheet three, glass sheet four causes with it all meets following formula:
the wherein optical path difference of Δ d caused by glass sheet angular deflection; N is glass sheet refractive index; θ
0for the deflection angle of glass sheet, i.e. the normal of glass sheet and horizontal direction angulation; D is the thickness of glass sheet.
3. different-bandwidth optics comb filter according to claim 1 and 2, is characterized in that, the thickness range of described glass sheet one, glass sheet two, glass sheet three, glass sheet four is 150 μm-380 μm.
4. different-bandwidth optics comb filter according to claim 1 and 2, it is characterized in that, the reflectivity of described catoptron one and catoptron four is 0.05%-0.1%, the reflectivity of described catoptron two and catoptron five is 30%-35%, and the reflectivity of described catoptron three and catoptron six is 99.8%-99.98%.
5. different-bandwidth optics comb filter according to claim 3, it is characterized in that, the refractive index of described glass sheet one, glass sheet two, glass sheet three, glass sheet four is 1.44, the thickness of described glass sheet one is 150 μm, glass sheet two thickness is 280 μm, glass sheet three thickness is 160 μm, and glass sheet four thickness is 295 μm.
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| CN201420473001.3U CN204086700U (en) | 2014-08-20 | 2014-08-20 | A kind of different-bandwidth optics comb filter |
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| CN201420473001.3U CN204086700U (en) | 2014-08-20 | 2014-08-20 | A kind of different-bandwidth optics comb filter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104166243A (en) * | 2014-08-20 | 2014-11-26 | 湖北捷讯光电有限公司 | Unequal-bandwidth optical comb filter |
| CN105700082A (en) * | 2016-04-11 | 2016-06-22 | 上海交通大学 | Adjustable interleaver based on silicon-substrate Michelson GT interferometer |
| CN112904070A (en) * | 2019-11-19 | 2021-06-04 | 许继集团有限公司 | All-fiber current transformer, detection module thereof and light path state diagnosis method |
-
2014
- 2014-08-20 CN CN201420473001.3U patent/CN204086700U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104166243A (en) * | 2014-08-20 | 2014-11-26 | 湖北捷讯光电有限公司 | Unequal-bandwidth optical comb filter |
| CN105700082A (en) * | 2016-04-11 | 2016-06-22 | 上海交通大学 | Adjustable interleaver based on silicon-substrate Michelson GT interferometer |
| CN105700082B (en) * | 2016-04-11 | 2018-09-21 | 上海交通大学 | Adjustable interleaver based on silicon substrate Michelson GT interferometers |
| CN112904070A (en) * | 2019-11-19 | 2021-06-04 | 许继集团有限公司 | All-fiber current transformer, detection module thereof and light path state diagnosis method |
| CN112904070B (en) * | 2019-11-19 | 2023-12-29 | 许继集团有限公司 | All-fiber current transformer, detection module thereof and optical path state diagnosis method |
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