CN102841406B - Optical staggered filtering device - Google Patents
Optical staggered filtering device Download PDFInfo
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- CN102841406B CN102841406B CN201210350623.2A CN201210350623A CN102841406B CN 102841406 B CN102841406 B CN 102841406B CN 201210350623 A CN201210350623 A CN 201210350623A CN 102841406 B CN102841406 B CN 102841406B
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- optical
- arm
- optical splitter
- optical waveguide
- splitter
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Abstract
The invention relates to the field of optical communication, in particular to an interleaver which is used in a hybrid-rate optical transmission system. The interleaver comprises an optical waveguide arm, an optical waveguide micro-ring and light splitters, three coupled light-splitting points exist between the optical waveguide arm and the optical waveguide micro-ring, each coupled light-splitting point corresponds to one of the light splitters, the three light splitters are a first light splitter, a second light splitter and a third light splitter, and the second light splitter is also connected with the third light splitter through the optical waveguide arm; the arc length of the optical waveguide micro-ring between the second light splitter and the third light splitter is an interference arm L1, the arm length of the optical waveguide arm between the second light splitter and the third light splitter is an interference arm L2, and the interference arm L2 is longer than the interference arm L1. The interleaver is used for optical signal transmission, and has the advantages that: the structure is compact, which is favorable for the integration of the interleaver and other optical circuits, and the channel bandwidth utilization rate can be effectively increased.
Description
Technical field
The present invention relates to optical communication field, particularly a kind of optics interleaver for mixing rate optical transmission system.
Background technology
Along with developing rapidly of infotech, the communication network in the whole world is being faced with the demand of higher message capacity, dense wave division multipurpose (Densen Wavelength Division Multiplexing, DWDM) is the cost-effective technology of one that improves message capacity in optical fiber communication.But along with channel spacing constantly reduces, the demultiplexer filter of system is faced with quite high performance requirement, is extremely unfavorable for control system cost and improves system performance.The effective ways that reduce this requirement are to adopt optics interleaver (Interleaver), because it can be divided into two groups of light signals that wavelength interval doubles one group of intensive light signal in wavelength interval.In addition, improving single-channel message transmission rate is also a kind of effective method that improves message capacity, the message transmission rate of light carrier 40Gbit/s (OC-768) comes into operation, meanwhile traditional 10Gbit/s transfer rate still has suitable utilization space, and therefore the mixed transport of 10Gbit/s and 40Gbit/s is a kind of desirable transmission plan.For hybrid transmission system, due to the difference of message transmission rate and modulation system, make two channels have different demands to bandwidth, thereby and narrow bandwidth may cause the intersymbol interference of high speed transmission system to reduce system transmission performance.Therefore, the symmetric form interleaver with fixed-bandwidth traditional in hybrid transmission system can not make bandwidth be fully utilized, and the asymmetric interleaver with asymmetric output spectra can be by distributing different bandwidth to meet the different demands of different channels to bandwidth.
Current, realizing symmetric form interleaver mainly contains: crystal birefringence (the Polarization Beam Interferometer of polarized light interference, PBI) type, Michelson G-T chamber (Michelson Gires-Tournois Interferometer, MGTI) type, fiber grating (Fiber Bragg Grating, FBG) is combined etc.The focus of recent researches concentrates in the improvement of various implementation methods on the one hand, and on the other hand, in current system, optimum bandwidth Δ f and transfer rate v exist approximation relation: Δ f >=1.5v.For the commingled system of different transmission rates, there is greater flexibility in the asymmetric interleaver of different-bandwidth.Currently realize asymmetrical interleaver and mainly comprise Mach-Zehnder (Mach-Zehnder) cascade connection type, Michelson G-T (MIGT) chamber interferometer type, birefringence fiber annular mirror type etc.
Current existing optics interleaver mainly contains the shortcoming of two aspects: on the one hand, the size of current realized optics interleaver is difficult to other optical device more greatly integrated; Part interleaver needs some expensive compensating devices can meet system requirements, and compensating device has further increased the complexity of design; Most of interleaver performances are stablized and are difficult to apply to actual system not.On the other hand, there is the hybrid transmission system of different rates in the upgrading of network at present, the bandwidth of channel can not be utilized fully.
Summary of the invention
The object of the present invention is to provide a kind of compact conformation, stable performance, effectively improve the staggered filter apparatus of optics of channel bandwidth utilization ratio.
The staggered filter apparatus of optics of the present invention comprises optical waveguide arm, the micro-ring of optical waveguide, optical splitter, between described optical waveguide arm and the micro-ring of optical waveguide, there are three coupling optical splitting point, the respectively corresponding optical splitter of each coupling optical splitting point, three optical splitters are respectively the first optical splitter, the second optical splitter, the 3rd optical splitter, and described the second optical splitter is also connected by optical waveguide arm with the 3rd optical splitter; The micro-ring arc length of optical waveguide between described the second optical splitter and the 3rd optical splitter is for interfering arm L
1, the brachium of the optical waveguide arm between the second optical splitter and the 3rd optical splitter is for interfering arm L
2, interfere arm L
2be greater than and interfere arm L
1.
Further, described the 3rd optical splitter is the optical splitter near light beam input port;
Further, the micro-ring arc length of optical waveguide between described the first optical splitter and the 3rd optical splitter is L, arranges and interferes arm L
2with interference arm L
1arm length difference Δ L
2-1equate with the girth of the micro-ring of optical waveguide, and Δ L
2-1=nL, n>=2.
The invention has the beneficial effects as follows, physical dimension compactness, be conducive to other optical circuit integrated, and based on selecting the optical splitter of different splitting ratios can realize symmetric form interleaver, and the asymmetric interleaver of any bandwidth ratio, effectively improve channel bandwidth utilization ratio.
Brief description of the drawings
Fig. 1 is existing asymmetric mach-zehnder interferometer structural representation.
Fig. 2 is the basic block diagram of the embodiment of the present invention.
Fig. 3 is the cross-sectional view of bimodulus interferometer in the embodiment of the present invention.
Fig. 4 is the output spectra of symmetric form interleaver in the embodiment of the present invention.
Fig. 5 is the output spectra of the asymmetric interleaver that in the present invention, bandwidth ratio is 1:2.
Fig. 6 is the output spectra of the asymmetric interleaver that in the present invention, bandwidth ratio is 1:4.
Embodiment
For making object of the present invention, technical scheme and advantage clearer, with reference to the accompanying drawings and in conjunction with specific embodiments, the present invention is described in further details.
The present invention be based on the micro-ring of existing waveguide and asymmetric mach-zehnder interferometer structure (referring to Fig. 1, existing Mach-Zehnder interferometers it by two coupling mechanism C
1, C
2serial connection forms.At 1,2 any one port input light source, by coupling mechanism C
1interfere arm L at two
1, L
2upper formation interference light, then by coupling mechanism C
2, again form interference light and export from 3,4 ports, by the adjusting of some parameters such as the splitting ratio to coupling mechanism, interference arm length difference, can obtain desirable waveform at output terminal.) basis on, designed a kind of staggered filter apparatus of light of new structure, referring to Fig. 2, the staggered filter apparatus of optics of the present invention is made up of optical waveguide arm, the micro-ring of optical waveguide, optical splitter: optical waveguide arm, for the transmission of light beam, be I/O and the transmission channel of light beam; The micro-ring of optical waveguide, interferes for the transmission of light and with the light that optical waveguide arm transmits; Optical splitter, realizes luminous power for the coupling of light signal and distributes, and the light signal light-splitting device of interfering, and can be bimodulus interferometer (Two-mode Interferometer, TMI), directional coupler etc.Between the micro-ring of optical waveguide arm and optical waveguide, there are three coupling optical splitting point, the corresponding optical splitter of each coupling optical splitting point, three optical splitters are followed successively by the first optical splitter, the second optical splitter, the 3rd optical splitter, described the first optical splitter connects light input end mouth, described the second optical splitter and the 3rd optical splitter are connected except the micro-ring of optical waveguide, also connect by optical waveguide arm, preferred, the 3rd optical splitter is the optical splitter near light beam input port, TMI as shown in Figure 2
1, TMI
2, TMI
3, get TMI
2and TMI
3between the micro-ring arc length of optical waveguide for interfering arm L
1, TMI
2and TMI
3between the brachium of optical waveguide arm for interfering arm L
2(L
2> L
1), interfere arm L
1, L
2and TMI
2, TMI
3form asymmetric mach-zehnder interferometer structure.In the present invention, by each section of arc length of micro-ring and TMI are set
2and TMI
3between the brachium L of optical waveguide arm
2and the luminous power distribution ratio of three optical splitters of adjusted design (wherein, the luminous power distribution ratio of the second optical splitter and the 3rd optical splitter is suitable, when design, be designed to identical as far as possible) just can realize this interleaver and the in the situation that of one-piece construction and size constancy, obtain symmetrical output spectra, and the asymmetrical output spectra of any bandwidth ratio, in implementation structure compactness, stable performance, can meet the demand of hybrid transmission system, effectively improve channel bandwidth utilization ratio.
In order to realize the object of the invention, can design the girth and interference arm length difference Δ L of the micro-ring of waveguide
2-1equate, wherein, Δ L
2-1=L
2-L
1, and meet Δ L
2-1=nL, wherein L is TMI
1and TMI
3between the micro-ring arc length of optical waveguide, n is not less than 2 integer.For make the present invention be easier to make and loss less.Preferably get n=4, and establish arc length L and TMI
1and TMI
2between the micro-ring arc length of optical waveguide be L ' equate, designed structure is as shown in Figure 2.It will be recognized by those skilled in the art that the restriction of the above-mentioned interference brachium providing, and the restriction of the micro-ring arc length of ripple L, L ' is only preferred embodiment of the present invention, other interfere the restriction of brachiums and arc length can realize equally the present invention.
And for bimodulus interferometer, at selected material and set after two-mode waveguide size, its light splitting ratio with its length a(referring to Fig. 3) corresponding, the corresponding light splitting ratio of each length value, when determining after the light splitting ratio of each optical splitter according to the concrete actual demand that uses the staggered filter apparatus of optics of the present invention, in the time making, the length of selected corresponding above-mentioned light splitting ratio can obtain the staggered filter apparatus of optics of the present invention, the length of bimodulus interferometer be chosen to be prior art, do not elaborate at this.
In conjunction with Fig. 2, light signal in the communication process of the staggered filter apparatus of optics of the present invention is: light signal is coupled into the staggered filter apparatus of optics from Input port, when light signal passes through TMI
1after, a part of light signal is from port Port1 output, and another part light signal enters the micro-ring of optical waveguide, and transmission arrives TMI
2and to be coupled into length through its point of light action rear portion be L
2optical waveguide arm in, remaining light signal continues to transmit in the micro-ring of optical waveguide; Two-beam is at TMI afterwards
3place meets and interferes, and consequently a part of light signal is from port Port2 output, another part light signal through the micro-ring of optical waveguide feed back to input end and with input optical signal at TMI
1place interferes.
Embodiment
The present invention, taking near a bit of wavelength coverage C-band 1550nm as example, according to the concrete application of the present embodiment, can set Δ L
2-1=4L, L=L ', L
1=Δ L/2, selects three suitable length a in TMI bimodulus district to make TMI
1luminous power distribution ratio be 0.95, TMI
2and TMI
3luminous power distribution ratio is 0.81(in the time of design, makes TMI as far as possible
2and TMI
3luminous power is distributed identical, but allows to exist deviation, and deviation only affects the isolation of output spectra), thereby obtain symmetric form interleaver of the present invention, obtain symmetrical output spectra as shown in Figure 4 by software simulation emulation, for the transmission of the two-beam signal of phase same rate, wavelength interval is doubled.
In addition, make Δ L
2-1=4L, L=L ', L
1=Δ L/2, adjusts the luminous power of above-mentioned three bimodulus interferometers and distributes specific energy to realize the asymmetric output spectra of any bandwidth ratio, makes TMI
1luminous power distribution ratio reduce, TMI
2and TMI
3luminous power distribution ratio all increases, and just obtains asymmetric interleaver of the present invention, obtains asymmetrical output spectra as shown in Figure 5 and Figure 6 by software simulation emulation, can be used for the optical signal transmission of different rates, effectively improves the utilization factor of channel width.
To sum up, the present invention, by the ingenious combination of the micro-ring of waveguide and Mach-Zehnder interferometers structure, has constructed a kind of staggered filter apparatus of optics of new structure, and the present invention is not only structurally compacter, be beneficial to the integrated of optical device, simultaneously at each section of arc length of selected micro-ring and curved waveguide arm L
2afterwards, the splitting ratio difference of the optical splitter based on selecting can realize the asymmetric interleaver of symmetric form interleaver and any bandwidth ratio.
The foregoing is only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.All any amendments of doing within the spirit and principles in the present invention, be equal to replacement, improvement etc., within protection scope of the present invention all should be included in.
Claims (10)
1. the staggered filter apparatus of optics, comprise optical waveguide arm, the micro-ring of optical waveguide, optical splitter, between described optical waveguide arm and the micro-ring of optical waveguide, there are three coupling optical splitting point, the respectively corresponding optical splitter of each coupling optical splitting point, three optical splitters are respectively the first optical splitter, the second optical splitter, the 3rd optical splitter, and described the second optical splitter is also connected by optical waveguide arm with the 3rd optical splitter; The micro-ring arc length of optical waveguide between described the second optical splitter and the 3rd optical splitter is for interfering arm L
1, the brachium of the optical waveguide arm between the second optical splitter and the 3rd optical splitter is for interfering arm L
2, interfere arm L
2be greater than and interfere arm L
1.
2. the staggered filter apparatus of optics as claimed in claim 1, is characterized in that, described the 3rd optical splitter is the optical splitter near light beam input port.
3. the staggered filter apparatus of optics as claimed in claim 1, is characterized in that, described the second optical splitter is identical with the luminous power distribution ratio of the 3rd optical splitter.
4. the staggered filter apparatus of the optics as described in claim 1,2 or 3, is characterized in that, the micro-ring arc length of optical waveguide between described the first optical splitter and the 3rd optical splitter is L, arranges and interferes arm L
2with interference arm L
1arm length difference Δ L
2-1equate with the girth of the micro-ring of optical waveguide, and Δ L
2-1=nL, n is more than or equal to 2 integer.
5. the staggered filter apparatus of optics as claimed in claim 4, is characterized in that, described n is 4.
6. the staggered filter apparatus of optics as claimed in claim 5, it is characterized in that, the micro-ring arc length of optical waveguide between described the first optical splitter and the 3rd optical splitter is brachium L, the micro-ring arc length of optical waveguide between described the first optical splitter and the second optical splitter is L ', arc length L is set and equates with arc length L '.
7. the staggered filter apparatus of optics as claimed in claim 1, is characterized in that, described optical splitter is bimodulus interferometer.
8. the staggered filter apparatus of optics as claimed in claim 7, is characterized in that, described bimodulus interferometer is rectangular bimodule waveguide, and the material of its covering and sandwich layer is identical with optical waveguide arm.
9. the staggered filter apparatus of optics as claimed in claim 1, is characterized in that, described optical splitter is directional coupler.
10. the staggered filter apparatus of optics as claimed in claim 1, is characterized in that, described optical waveguide arm is rectangle monomode optical waveguide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210350623.2A CN102841406B (en) | 2012-09-20 | 2012-09-20 | Optical staggered filtering device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210350623.2A CN102841406B (en) | 2012-09-20 | 2012-09-20 | Optical staggered filtering device |
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| Publication Number | Publication Date |
|---|---|
| CN102841406A CN102841406A (en) | 2012-12-26 |
| CN102841406B true CN102841406B (en) | 2014-07-16 |
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|---|---|---|---|
| CN201210350623.2A Expired - Fee Related CN102841406B (en) | 2012-09-20 | 2012-09-20 | Optical staggered filtering device |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105223655B (en) * | 2015-10-21 | 2018-03-30 | 哈尔滨工业大学 | A kind of straight wave guide ring for bandreject filtering feeds back waveguide straight wave guide resonator system |
| CN107315224B (en) * | 2017-08-14 | 2018-09-28 | 河南仕佳光子科技股份有限公司 | A kind of adjustable insensitive directional coupler of wide range wavelength |
| CN110764284A (en) * | 2019-10-18 | 2020-02-07 | 中国地质大学（武汉） | Large-range bandwidth-adjustable microwave photon filter based on silicon-based micro-ring |
| CN113253392A (en) * | 2021-07-02 | 2021-08-13 | 西安奇芯光电科技有限公司 | Flat-top type multipath signal wave-splitting or wave-combining device structure |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6222958B1 (en) * | 1999-07-22 | 2001-04-24 | Jds Fitel Inc. | Optical interleaver/de-interleaver |
| CN101790696A (en) * | 2007-07-20 | 2010-07-28 | 英飞聂拉股份有限公司 | Optical interleaver based on mach-zehnder interferometers and ring resonators |
-
2012
- 2012-09-20 CN CN201210350623.2A patent/CN102841406B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6222958B1 (en) * | 1999-07-22 | 2001-04-24 | Jds Fitel Inc. | Optical interleaver/de-interleaver |
| CN101790696A (en) * | 2007-07-20 | 2010-07-28 | 英飞聂拉股份有限公司 | Optical interleaver based on mach-zehnder interferometers and ring resonators |
Non-Patent Citations (3)
| Title |
|---|
| Chris G.H. Roeloffzen，et al..Passband flattened Periodic Multi/Demultiplexer using a Mach-Zehnder Interferometer with Ring Resonator fabricated in SiON waveguide technology.《Proceedings of SPIE》.2003,第4947卷84-91. * |
| 环形谐振器辅助马赫-曾德尔干涉仪型波长交错滤波器的研究;董小伟 等;《光学学报》;20080430;第28卷(第4期);638-642 * |
| 董小伟 等.环形谐振器辅助马赫-曾德尔干涉仪型波长交错滤波器的研究.《光学学报》.2008,第28卷(第4期),638-642. |
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| CN102841406A (en) | 2012-12-26 |
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