CN110441863A - A kind of ultra-wide passband high capacity filter - Google Patents
A kind of ultra-wide passband high capacity filter Download PDFInfo
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- CN110441863A CN110441863A CN201910645252.2A CN201910645252A CN110441863A CN 110441863 A CN110441863 A CN 110441863A CN 201910645252 A CN201910645252 A CN 201910645252A CN 110441863 A CN110441863 A CN 110441863A
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- reflecting surface
- resonant cavity
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- high capacity
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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
- G02B6/29346—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 wave or beam interference
- G02B6/29361—Interference filters, e.g. multilayer coatings, thin film filters, dichroic splitters or mirrors based on multilayers, WDM filters
Abstract
The invention discloses a kind of ultra-wide passband high capacity filters, including beam splitter, the first GT resonant cavity and the 2nd GT resonant cavity, first GT resonant cavity and the 2nd GT resonant cavity are separately positioned on the vertical line of beam splitter, beam splitter is made of two triangle glass prism adhesive gluings, the joint face of triangle glass prism constitutes beam-splitting surface, increase by the first GT resonant cavity to adjust the dispersion characteristics of laser beam, and with this come to laser beam through the first GT resonate cavity reflection after dispersion characteristics make high-order compensation, meet E=D；Lb=La+D/2；Ra is less than Rb, and when conditions above meets, the waveform of the first output light and the second output light greatly improves than before, more close to square wave, reflectivity Ra=59.3% of third reflecting surface, reflectivity Rb=8.6% of the first reflecting surface, by adjusting Ra, the value of Rb, the characteristic for changing or optimizing output waveform, can be seen that filter passband with the waveform in four waveform comparison figure two of figure and has been significantly increased, very close theoretical value, i.e. 100% channel spacing.
Description
Technical field
The present invention relates to a kind of filter, in particular to a kind of ultra-wide passband high capacity filter.
Background technique
In DWDM communication system, comb filter (wavelengthinterleaver) is commonly used to realize that high density is closed
Wavelength-division wave energy is applied to 50GHz channel spacing, the system at the interval 25GHz or even 12.5GHz, when channel spacing is closer and closer
When, the bandwidth of filtering device needs access to 100% channel spacing, and system could be carried out effectively using limited optical band section
The communication of high capacity high efficiency.
Common device design at present, useful birefringece crystal, also useful GT interferometer.The device of birefringece crystal
Having that pass band width is narrow, Insertion Loss is high and weakness at high cost, GT interferometer class device has at low cost, the low advantage of Insertion Loss, and
And designed compared with birefringece crystal class, in this index of pass band width, improving much, but in actual use, bandwidth is still inadequate,
It is therefore desirable to this index is greatly improved by newly designing.
Summary of the invention
The purpose of the present invention is to provide a kind of ultra-wide passband high capacity filter, has and increase by the first GT resonant cavity to adjust
Save laser beam dispersion characteristics, and with this come to laser beam through the first GT resonate cavity reflection after dispersion characteristics make high-order compensation
Advantage.
To achieve the above object, the invention provides the following technical scheme: a kind of ultra-wide passband high capacity filter, including point
Beam device, the first GT resonant cavity and the 2nd GT resonant cavity, the first GT resonant cavity and the 2nd GT resonant cavity are separately positioned on beam splitter
On vertical line, beam splitter is combined by two triangle glass prisms and is formed, and the joint face of triangle glass prism constitutes beam-splitting surface；
First reflecting surface and the second reflecting surface be installed respectively on two faces of the first GT resonant cavity, the two of the 2nd GT resonant cavity
Third reflecting surface and the 4th reflecting surface are installed respectively, first reflecting surface is located at the front end of the second reflecting surface, the two on a face
On the X-axis line of beam splitter, third reflecting surface is located at the front end of the 4th reflecting surface, and the two is located on the Y-axis line of beam splitter.
Further, there is the irradiation of laser beam 4 on beam splitter 1, laser beam 4 is dispersed into 41 He of light beam by beam-splitting surface 11
Second beam light 42, light beam 41 is all-trans through the second reflecting surface 22 again after 21 part of the first reflecting surface is reflected is emitted back towards beam-splitting surface
11。
Further, the first GT resonant cavity 2 and the light of the 2nd GT resonant cavity 3 reflection are converted to by the coupling of beam-splitting surface 11
For the first output light 5 and the second output light 6 being separated from each other, the first output light 5 and the same path of laser beam 4.
Further, beam-splitting surface reflection light by beam-splitting surface coupling transform into orthogonal first output light and
Second output light, the first output light and the same path of laser beam.
Further, the single light path of the first GT resonant cavity is E, and the single light path of the 2nd GT resonant cavity is D, the two light path
Difference is zero.
Lb= La+ D/2 (1)
Lb is optical path difference of the beam-splitting surface to the second reflecting surface, and La is optical path difference of the beam-splitting surface to third reflecting surface, the first reflecting surface
Reflectivity Rb be less than third reflecting surface reflectivity Ra.
Compared with prior art, the beneficial effects of the present invention are:
This ultra-wide passband high capacity filter increases by the first GT resonant cavity to adjust the dispersion characteristics of laser beam, and is come pair with this
Dispersion characteristics of the laser beam after the first GT resonates cavity reflection make high-order compensation, meet E=D；Lb= La+ D/2；Ra be less than Rb with
When upper condition meets, the waveform of the first output light and the second output light greatly improves than before, more close to square wave, such as third
Reflectivity Ra=59.3% of reflecting surface, reflectivity Rb=8.6% of the first reflecting surface, by adjusting Ra, the value of Rb, thus it is possible to vary or
The characteristic for optimizing output waveform, can be seen that filter passband with the waveform in Fig. 4 waveform comparison Fig. 2 and has been significantly increased, non-
Very close to theoretical value, i.e. 100% channel spacing.
Detailed description of the invention
Fig. 1 is the schematic illustration of routine GT interferometer；
Fig. 2 is the waveform diagram of routine GT interferometer；
Fig. 3 is interferometer schematic illustration of the invention；
Fig. 4 is the waveform diagram of device of the invention.
In figure: 1, beam splitter；11, beam-splitting surface；2, the first GT resonant cavity；21, the first reflecting surface；22, the second reflecting surface；3,
2nd GT resonant cavity；31, third reflecting surface；32, the 4th reflecting surface；4, laser beam；41, light beam；42, the second beam light；5,
First output light；6, the second output light, 7, reflecting mirror.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear；It is complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments, is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
After present collimated laser beam 4 is incident on the beam-splitting surface 11 of beam splitter 1 referring to FIG. 1-2, it is divided into light beam 41
With the second beam light 42, the second beam light 42 is incident on the 2nd GT resonant cavity 3, and light beam 41 is incident on reflecting mirror, the 2nd GT resonance
Chamber 3 and reflecting mirror respectively reflect light beam 41 and the second beam light 42, and reflected light is through backtracking, by 1 coupling of beam splitter
Conjunction transforms into the first output light 5 and the second output light 6, these are as the common Michelson interferometer method of operation, herein
It is not repeated, the special character of GT interferometer, is to change the dispersion characteristic of reflected light using GT resonant cavity, some specific
Under the conditions of make the waveform of the first output light 111 and the second output light 112 in square-wave-shaped.
Reflecting mirror is made of high reflection face, and GT resonant cavity is made of high reflection face and weak reflecting surface, all high reflection faces
All close to 100%, aforementioned specified conditions can be indicated reflectivity by following equation:
Lb= La+ D/2 (1)
Wherein Lb is the optical path difference that beam-splitting surface 11 arrives high reverse side, and La is the optical path difference that beam-splitting surface 11 arrives weak reverse side, and D is GT resonant cavity
Single light path (i.e. thickness is multiplied by refractive index), when equation (1) meets, the rectangular comb wave of the waveform of reflected light, weak reflecting surface
Reflectivity Ra=17.6%, this filter is used in 50GHz channel spacing, 0.5dB passband is about 42GHz, i.e. channel spacing
The stopping bandwidth of 84%, 30dB are about 29GHz, i.e. the 58% of channel spacing, and waveform bandwidth does not still meet high density high capacity
The requirement of communication system.
Please refer to Fig. 3-4, a kind of ultra-wide passband high capacity filter, including beam splitter 1, the first GT resonant cavity 2 and second
GT resonant cavity 3, the first GT resonant cavity 2 and the 2nd GT resonant cavity 3 are separately positioned on the vertical line of beam splitter 1, and beam splitter 1 is by two
A triangle glass prism, which combines, to be formed, the joint face composition beam-splitting surface 11 of triangle glass prism, and the two of the first GT resonant cavity 2
First reflecting surface 21 and the second reflecting surface 22 are installed respectively on a face, third is installed respectively on two faces of the 2nd GT resonant cavity 3
Reflecting surface 31 and the 4th reflecting surface 32, first reflecting surface 21 are located at the front end of the second reflecting surface 22, and the two is located at beam splitter 1
X-axis line on, third reflecting surface 31 is located at the front end of the 4th reflecting surface 32, and the two is located on the Y-axis line of beam splitter 1, the two position
In on the Y-axis line of beam splitter 1.
There is the irradiation of laser beam 4 on beam splitter 1, laser beam 4 is dispersed into light beam 41 and the second beam light by beam-splitting surface 11
42, light beam 41 is all-trans through the second reflecting surface 22 again after 21 part of the first reflecting surface is reflected is emitted back towards beam-splitting surface 11, and second
Beam light 42 is all-trans through the 4th reflecting surface 32 again after the part reflection by third reflection 31 is emitted back towards beam-splitting surface 11, the first GT resonant cavity
2 and the 2nd GT resonant cavity 3 reflect light by beam-splitting surface 11 coupling transform into the first output light 5 and second being separated from each other
Output light 6, the first output light 5 and the same path of laser beam 4.
Increase by the first GT resonant cavity 2 to adjust the dispersion characteristics of laser beam 4, and to be total to laser beam 4 through the first GT with this
Dispersion characteristics after vibration chamber 2 reflects make high-order compensation, make output waveform more close to the target of square wave to reach, to reach this mesh
Mark, following condition need to be met:
Lb is the optical path difference of beam-splitting surface (11) to the second reflecting surface (22), and La is the light that beam-splitting surface (11) arrive third reflecting surface (31)
Path difference, the reflectivity Rb of the first reflecting surface (21) are less than the reflectivity Ra of third reflecting surface (31).
D=E (1)
Lb= La+ D/2 (2)
Ra > RB (3)
According to formula (1) (2) (3), wherein the single light path of the first GT resonant cavity 2 of setting is E, the list of the 2nd GT resonant cavity 3
Secondary light path is D, and the two optical path difference is the optical path difference that zero, Lb is the 11 to the second reflecting surface of beam-splitting surface 22, and La is beam-splitting surface 11 to the
The optical path difference of three reflectings surface 31, the reflectivity Rb of the first reflecting surface 21 are less than the reflectivity of third reflecting surface 31.
When conditions above meets, the waveform of the first output light 5 and the second output light 6 greatly improves than before, more connects
Nearly square wave, it is seen that when being used in 50GHz channel spacing, 0.5dB passband is about 48GHz, i.e. 96%, 30dB's of channel spacing stops
The wide about 43GHz of stop-band, i.e. the 86% of channel spacing, reflectivity Ra=59.3% of third reflecting surface 31, the first reflecting surface 21 it is anti-
Rate Rb=8.6% is penetrated, by adjusting Ra, the value of Rb changes or optimize the characteristic of output waveform, with the wave in Fig. 4 waveform comparison Fig. 2
Shape can be seen that filter passband and be significantly increased, very close theoretical value, i.e. 100% channel spacing.
In conclusion this ultra-wide passband high capacity filter, increases by the first GT resonant cavity 2 to adjust the dispersion of laser beam 4
Characteristic, and with this come to laser beam 4 through the first GT resonant cavity 2 reflection after dispersion characteristics make high-order compensation, meet E=D；Lb= La
+ D/2；When Ra meets less than Rb conditions above, the waveform of the first output light 5 and the second output light 6 greatly improves than before, more
To approach square wave, reflectivity Ra=59.3% of third reflecting surface 31, reflectivity Rb=8.6% of the first reflecting surface 21 passes through adjusting
The value of Ra, Rb change or optimize the characteristic of output waveform, and it is logical to can be seen that filter with the waveform in Fig. 4 waveform comparison Fig. 2
Band has been significantly increased, very close theoretical value, i.e. 100% channel spacing.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art within the technical scope of the present disclosure, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (6)
1. a kind of ultra-wide passband high capacity filter, which is characterized in that including beam splitter (1), the first GT resonant cavity (2) and second
GT resonant cavity (3), the first GT resonant cavity (2) and the 2nd GT resonant cavity (3) are separately positioned on the vertical line of beam splitter (1), point
Beam device (1) is combined by two triangle glass prisms and is formed, and the joint face of triangle glass prism constitutes beam-splitting surface (11)；
First reflecting surface (21) and the second reflecting surface (22) be installed respectively on two faces of the first GT resonant cavity (2), second
Third reflecting surface (31) and the 4th reflecting surface (32), first reflecting surface are installed respectively on two faces of GT resonant cavity (3)
(21) it is located at the front end of the second reflecting surface (22), the two is located on the X-axis line of beam splitter (1), and third reflecting surface (31) is positioned at the
The front end of four reflectings surface (32), the two are located on the Y-axis line of beam splitter (1).
2. a kind of ultra-wide passband high capacity filter according to claim 1, which is characterized in that have on beam splitter (1) sharp
Light beam (4) irradiation, laser beam (4) are dispersed into light beam (41) and the second beam light (42), light beam by beam-splitting surface (11)
(41) it is all-trans again through the second reflecting surface (22) after the first reflecting surface (21) part is reflected and is emitted back towards beam-splitting surface (11).
3. a kind of ultra-wide passband high capacity filter according to claim 1, which is characterized in that the second beam light (42) passes through
It is all-trans again through the 4th reflecting surface (32) after the part reflection of third reflecting surface (31) and is emitted back towards beam-splitting surface (11).
4. a kind of ultra-wide passband high capacity filter according to claim 1, which is characterized in that the first GT resonant cavity (2)
The first output light (5) being separated from each other is transformed by beam-splitting surface (11) coupling with the light of the 2nd GT resonant cavity (3) reflection
With the second output light (6), the first output light (5) and laser beam (4) same to path.
5. a kind of ultra-wide passband high capacity filter according to claim 1, which is characterized in that the first GT resonant cavity (2)
Single light path be E, the single light path of the 2nd GT resonant cavity (3) is D, and the two optical path difference is zero.
6. a kind of ultra-wide passband high capacity filter according to claim 1, which is characterized in that wherein:
Lb= La+ D/2 (1)
Lb is the optical path difference of beam-splitting surface (11) to the second reflecting surface (22), and La is the light that beam-splitting surface (11) arrive third reflecting surface (31)
Path difference, the reflectivity Rb of the first reflecting surface (21) are less than the reflectivity Ra of third reflecting surface (31).
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| CN201910645252.2A CN110441863A (en) | 2019-07-17 | 2019-07-17 | A kind of ultra-wide passband high capacity filter |
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| CN201910645252.2A CN110441863A (en) | 2019-07-17 | 2019-07-17 | A kind of ultra-wide passband high capacity filter |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020176659A1 (en) * | 2001-05-21 | 2002-11-28 | Jds Uniphase Corporation | Dynamically tunable resonator for use in a chromatic dispersion compensator |
| CN1407750A (en) * | 2001-02-27 | 2003-04-02 | Jds尤尼费斯公司(加拿大) | Low-dispersion weave device |
| CN101943772A (en) * | 2010-08-26 | 2011-01-12 | 华中科技大学 | Tunable optical comb filter combining G-T resonant cavity and birefringence element |
| CN203519872U (en) * | 2013-11-08 | 2014-04-02 | 福州高意通讯有限公司 | Multiplexing structure of light-crossing wave dividing multiplexer |
| CN104166243A (en) * | 2014-08-20 | 2014-11-26 | 湖北捷讯光电有限公司 | Unequal-bandwidth optical comb filter |
-
2019
- 2019-07-17 CN CN201910645252.2A patent/CN110441863A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1407750A (en) * | 2001-02-27 | 2003-04-02 | Jds尤尼费斯公司(加拿大) | Low-dispersion weave device |
| US20020176659A1 (en) * | 2001-05-21 | 2002-11-28 | Jds Uniphase Corporation | Dynamically tunable resonator for use in a chromatic dispersion compensator |
| CN101943772A (en) * | 2010-08-26 | 2011-01-12 | 华中科技大学 | Tunable optical comb filter combining G-T resonant cavity and birefringence element |
| CN203519872U (en) * | 2013-11-08 | 2014-04-02 | 福州高意通讯有限公司 | Multiplexing structure of light-crossing wave dividing multiplexer |
| CN104166243A (en) * | 2014-08-20 | 2014-11-26 | 湖北捷讯光电有限公司 | Unequal-bandwidth optical comb filter |
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Address after: 350015 five floors and three floors of building a and building B, building 1, Chashan Road, Mawei science and Technology Park, Fuzhou City, Fujian Province (within the free trade zone) Applicant after: Tengjing Technology Co.,Ltd. Address before: 350015 five floors and three floors of building a and building B, building 1, Chashan Road, Mawei science and Technology Park, Fuzhou City, Fujian Province (within the free trade zone) Applicant before: FUZHOU OPTOWIDE TECHNOLOGIES CO.,LTD. |
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Application publication date: 20191112 |