CN107065073A - Broad band wavelength bandwidth tunable filter based on cascade interweaved device - Google Patents
Broad band wavelength bandwidth tunable filter based on cascade interweaved device Download PDFInfo
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- CN107065073A CN107065073A CN201710259336.3A CN201710259336A CN107065073A CN 107065073 A CN107065073 A CN 107065073A CN 201710259336 A CN201710259336 A CN 201710259336A CN 107065073 A CN107065073 A CN 107065073A
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- interleaver
- order
- output
- bandwidth
- tunable filter
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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
- G02B6/29347—Loop interferometers, e.g. Sagnac, loop mirror
Abstract
A kind of broad band wavelength bandwidth tunable filter based on cascade interweaved device, including：The interleaver of at least two cascades, every grade of interleaver is all made up of micro-loop auxiliary MZI, wherein：For the first order interleaver of realizing the regulation of wavelength and bandwidth and the switching of complementary spectrum two monocyclic arms one end as input, the other end is connected with one end of the arm without π phase shifts of the second level interleaver of the switching for realizing wavelength regulation and complementation spectrum；The other end of the arm without π phase shifts of second level interleaver is output end.The present invention has the advantage of wavelength continuously adjustabe and bandwidth continuously adjustabe in single resonance peak in broadband (such as 20nm), box filter spectrum, broadband.
Description
Technical field
The present invention relates to a kind of technology of fiber optic communication field, specifically a kind of broadband ripple based on cascade interweaved device
Long bandwidth tunable filter.
Background technology
Silicon based photon device has the advantages that strong mould field constraint characteristic and mutually compatible with CMOS technology, is the reason of integrated optical circuit
Think selection.Silicon based photon device mainly includes wave filter, modulator, photoswitch, router and detector etc..In reconfigurable optical point
Insert multiplexing in, four important characteristics be CDCG (colorless is colourless, and directionless is directionless,
Contentionless is clog-free and gridless is without grid).In order to realize it is colourless and without grid, it is necessary to design broad band wavelength band
Wide adjustable optical filter, the device needs have four characteristics：Ripple in single resonance peak in broadband, box filter spectrum, broadband
Long continuously adjustabe, bandwidth continuously adjustabe.
By the retrieval discovery to prior art, Piero Orlandi et al. are published in Journal of in 2014
Lightwave Technology, paper " the Photonic integrated filter with widely of the 5th phase of volume 32
Tunable bandwidth " realize the bandwidth tunable filter that Mach-Zehnder interferometer (MZI) is aided in based on 2 rings, but should
Filter center wavelength adjustable range is smaller, has multiple resonance peaks in broadband (20nm).
The content of the invention
The present invention can not be filtered the regulation of device bandwidth for prior art and AWG is lacked to fabrication error sensitivity etc.
Fall into, a kind of broad band wavelength bandwidth tunable filter based on cascade interweaved device is proposed, with single resonance in broadband (such as 20nm)
The advantage of wavelength continuously adjustabe and bandwidth continuously adjustabe in peak, box filter spectrum, broadband.
The present invention is achieved by the following technical solutions：
The present invention includes the interleaver of at least two cascades, and every grade of interleaver is all made up of micro-loop auxiliary MZI, wherein：With
In the regulation for realizing wavelength and bandwidth and one end of two monocyclic arms of the first order interleaver of the switching of complementary spectrum
As input, the other end is with the second level interleaver of the switching for realizing wavelength regulation and complementary spectrum without π phase shifts
An arm one end be connected；The other end of the arm without π phase shifts of second level interleaver is output end.
By designing suitable parameter, micro-loop auxiliary MZI can realize that box filter is composed.Pass through the wavelength of two-stage interleaver
Regulation and spectrum handoff functionality realize that the wavelength of wave filter is continuously adjusted.Realized by the bandwidth adjustment function of first order interleaver
The bandwidth of wave filter is continuously adjusted.The Channel assignment function of two-stage interleaver causes in broadband range (such as 20nm) wave filter
Only one of which resonance peak.In order to realize the single resonance peak in bigger bandwidth range, three-level or more interleaver can be cascaded.
Technique effect
Compared with prior art, the present invention has single resonance peak in broadband (such as 20nm), and box filter spectrum, wavelength is continuous
Adjustable, the characteristics of bandwidth continuously adjustabe, and device size is small, and control is simple, low in energy consumption.
Brief description of the drawings
Fig. 1 is the tunable filter schematic diagram based on cascade interweaved device；
Fig. 2 is to aid in the tunable filter structure that MZI structures are realized with micro-loop；
Fig. 3 is six kinds of working condition spectrum schematic diagrames of tunable filter；
Fig. 4 is tunable filter simulated spectra figure.
Embodiment
As depicted in figs. 1 and 2, the present embodiment includes：The interleaver of two cascades, wherein：First order interleaver is auxiliary by 2 rings
MZI is helped to realize that wavelength bandwidth is adjusted, second level interleaver realizes wavelength regulation by 2 rings auxiliary MZI.
Described broad band wavelength bandwidth tunable filter, its transfer function is：T=T1T2, Wherein：T1And T2The biography of difference one output port of the first order and second level interleaver
Defeated function, AiAnd ti, wherein i=1~4, correspondence is respectively four monocyclic transfer functions and directional coupler transmission coefficient；Wherein：K=1~6, i.e. length are lkWaveguide transfer rate, α and β be respectively waveguide loss factor and
Propagation constant, j is imaginary unit；t1~t4Respectively 0.5,0.5,0.785,0.243.
All monocyclic chamber length are L=50.266 μm, and first order interleaver MZI two-arm length difference is L, second level interleaver
MZI two-arm length difference be L/2, long-armed connection transmission coefficient for 0.785 it is monocyclic.The freely frequency of the first order and second level interleaver
Spectral limit (FSR) is respectively 10.912nm and 22.180nm.The wave filter realizes that all waveguides are on SOI platforms
450nm × 220nm single mode waveguide.
As shown in figure 3, the broad band wavelength bandwidth tunable filter described in the present embodiment, can be achieved six kinds of working conditions：
State 1：When being not powered on pressure, the cascade end output channel Ch1 of first order interleaver, Ch3, the output of second level interleaver
End output Ch1.
State 2：Such as need Ch2 being output to second level interleaver output, then to first order interleaver arm length difference making alive
π phase shifts are produced, then adjust the bandwidth of first order interleaver, cascade end is exported Ch2, Ch4.
State 3：Such as need Ch3 being output to second level interleaver output, then to second level interleaver arm length difference making alive
It is that can be achieved to produce π phase shifts.
State 4：Such as need Ch4 being output to second level interleaver output, then by the first order and second level interleaver brachium
Poor making alive produces π phase shifts, then adjusts the bandwidth of first order interleaver.
State 5：Such as need to adjust channel center wavelengths, then by the first order and second level centre wavelength red shift identical distance.
State 6：Such as need to adjust channel width, then bandwidth adjustment is carried out to first order interleaver.
Fig. 4 gives the simulated spectra figure under six kinds of states of wave filter, the simulation result according to Fig. 4, and the present invention can
With single resonance peak in realization~20nm bandwidth ranges, squarish filtering spectrum, the wavelength in the range of~20nm continuously adjust and
Bandwidth from 1.216nm to 2.824nm is continuously adjusted.Wave filter extinction ratio is about 20dB, by increasing the micro- of two-stage interleaver
Ring number can further improve extinction ratio.
Above-mentioned specific implementation can by those skilled in the art on the premise of without departing substantially from the principle of the invention and objective with difference
Mode local directed complete set is carried out to it, protection scope of the present invention is defined by claims and not by above-mentioned specific implementation institute
Limit, each implementation in the range of it is by the constraint of the present invention.
Claims (6)
1. a kind of broad band wavelength bandwidth tunable filter based on cascade interweaved device, it is characterised in that including：At least two cascades
Interleaver, every grade of interleaver all by micro-loop auxiliary MZI constitute, wherein：Regulation and complementation for realizing wavelength and bandwidth
Wavelength is realized with being used in one end of two monocyclic arms of the first order interleaver of the switching of spectrum as input, the other end
One end of the arm without π phase shifts of the second level interleaver of regulation and the switching of complementary spectrum is connected；Second level interleaver
The other end of an arm without π phase shifts is output end.
2. broad band wavelength bandwidth tunable filter according to claim 1, it is characterized in that, described broad band wavelength bandwidth can
Tunable filter, its transfer function is：T=T1T2,Wherein：
T1And T2The transfer function of difference one output port of the first order and second level interleaver, AiAnd ti, wherein i=1~4, correspondence point
Wei not four monocyclic transfer functions and directional coupler transmission coefficient；Wherein：K=1~6, i.e. length are
lkWaveguide transfer rate, α and β are the loss factor and propagation constant of waveguide respectively, and j is imaginary unit；t1~t4Respectively
0.5,0.5,0.785,0.243.
3. broad band wavelength bandwidth tunable filter according to claim 1 or 2, it is characterized in that, the described first order interweaves
Device MZI two-arm length difference is L, and second level interleaver MZI two-arm length difference is L/2, and long-armed connection transmission coefficient is 0.785 list
Ring.
4. broad band wavelength bandwidth tunable filter according to claim 3, it is characterized in that, the described a length of L of monocyclic chamber
=50.266 μm, the single mode waveguide that described waveguide is 450nm × 220nm.
5. broad band wavelength bandwidth tunable filter according to claim 1 or 2, it is characterized in that, the described first order and
The free spectral range of two grades of interleavers is respectively 10.912nm and 22.180nm.
6. the broad band wavelength bandwidth tunable filter according to any of the above-described claim, it is characterized in that, the broad band wavelength band
The output of wide tunable filter specifically includes following six kinds of combinations：
State 1：When being not powered on pressure, the output of cascade end the channel Ch1 and Ch3 of first order interleaver, second level interleaver output
Export Ch1；
State 2：Such as need Ch2 being output to second level interleaver output, then π is produced to first order interleaver arm length difference making alive
Phase shift, then the bandwidth of first order interleaver is adjusted, cascade end is exported Ch2 and Ch4；
State 3：Such as need Ch3 being output to second level interleaver output, then π is produced to second level interleaver arm length difference making alive
Phase shift is that can be achieved；
State 4：Such as need Ch4 being output to second level interleaver output, then add the first order and second level interleaver arm length difference
Voltage produces π phase shifts, then adjusts the bandwidth of first order interleaver；
State 5：Such as need to adjust channel center wavelengths, then by the first order and second level centre wavelength red shift identical distance；
State 6：Such as need to adjust channel width, then bandwidth adjustment is carried out to first order interleaver.
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| CN107065073B CN107065073B (en) | 2019-06-18 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110908146A (en) * | 2019-12-12 | 2020-03-24 | 华中科技大学 | Silicon-based integrated tunable band-pass filter |
| CN116256062A (en) * | 2023-04-20 | 2023-06-13 | 长沙思木锐信息技术有限公司 | Spectral analysis device, method and calibration method |
Citations (4)
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| US20050244103A1 (en) * | 2004-03-01 | 2005-11-03 | Kwakernaak Martin H | Photonic device and method for making same |
| CN103941430A (en) * | 2014-05-15 | 2014-07-23 | 上海交通大学 | Adjustable light frequency comb filter based on silicon-based FP resonant cavity |
| EP3073303A1 (en) * | 2015-03-25 | 2016-09-28 | Aurrion, Inc. | Wavelength locking filter |
| CN106249354A (en) * | 2016-09-27 | 2016-12-21 | 华中科技大学 | A kind of microwave photon band elimination filter based on micro-loop Yu Mach Zehnder interferometry structure |
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2017
- 2017-04-20 CN CN201710259336.3A patent/CN107065073B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20050244103A1 (en) * | 2004-03-01 | 2005-11-03 | Kwakernaak Martin H | Photonic device and method for making same |
| CN103941430A (en) * | 2014-05-15 | 2014-07-23 | 上海交通大学 | Adjustable light frequency comb filter based on silicon-based FP resonant cavity |
| EP3073303A1 (en) * | 2015-03-25 | 2016-09-28 | Aurrion, Inc. | Wavelength locking filter |
| CN106249354A (en) * | 2016-09-27 | 2016-12-21 | 华中科技大学 | A kind of microwave photon band elimination filter based on micro-loop Yu Mach Zehnder interferometry structure |
Non-Patent Citations (1)
| Title |
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| XINHONG JIANG ETAL: "Compact Silicon Photonic Interleaver Using Loop-Mirror-Based Michelson-Gires-Tournois Interferometer", 《OFC 2016》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110908146A (en) * | 2019-12-12 | 2020-03-24 | 华中科技大学 | Silicon-based integrated tunable band-pass filter |
| CN116256062A (en) * | 2023-04-20 | 2023-06-13 | 长沙思木锐信息技术有限公司 | Spectral analysis device, method and calibration method |
| CN116256062B (en) * | 2023-04-20 | 2024-02-09 | 长沙思木锐信息技术有限公司 | Spectral analysis device, method and calibration method |
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| CN107065073B (en) | 2019-06-18 |
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