CN107065073B - 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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- CN107065073B CN107065073B CN201710259336.3A CN201710259336A CN107065073B CN 107065073 B CN107065073 B CN 107065073B CN 201710259336 A CN201710259336 A CN 201710259336A CN 107065073 B CN107065073 B CN 107065073B
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- interleaver
- order
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- 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, it include: at least two cascade interleavers, every grade of interleaver is all made of micro-loop auxiliary MZI, wherein: one end for realizing an arm of two monocycles of the first order interleaver of the switching of the adjusting and complementary spectrum of wavelength and bandwidth is used as input terminal, and the other end is connected with one end of the arm without π phase shift of the second level interleaver of the switching for realizing wavelength regulation and complementary spectrum；The other end of the arm without π phase shift of second level interleaver is output end.The present invention has single resonance peak in broadband (such as 20nm), and box filter is composed, the advantage that wavelength is continuously adjustable in broadband and bandwidth is continuously adjustable.
Description
Technical field
The present invention relates to a kind of technology of fiber optic communication field, specifically a kind of broadband wave based on cascade interweaved device
Long bandwidth tunable filter.
Background technique
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
Want to select.Silicon based photon device mainly includes 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).It is colourless and without grid in order to realize, need to design broad band wavelength band
The adjustable optical filter of width, which needs tool, and there are four characteristics: single resonance peak in broadband, box filter spectrum, wave in broadband
Long continuously adjustable, bandwidth is continuously adjustable.
After searching and discovering the prior art, Piero Orlandi et al. is published in Journal of in 2014
Lightwave Technology, paper " the Photonic integrated filter with widely of the 5th phase of volume 32
Tunable bandwidth " realizes the bandwidth tunable filter based on 2 rings auxiliary Mach-Zehnder interferometer (MZI), however should
Filter center wavelength adjustable range is smaller, has multiple resonance peaks in broadband (20nm).
Summary of the invention
The present invention for the prior art cannot be filtered the adjusting of device bandwidth and to AWG it is sensitive to fabrication error equal scarce
It falls into, proposes a kind of broad band wavelength bandwidth tunable filter based on cascade interweaved device, there is single resonance in broadband (such as 20nm)
Peak, box filter are composed, the advantage that wavelength is continuously adjustable in broadband and bandwidth is continuously adjustable.
The present invention is achieved by the following technical solutions:
The present invention includes at least two cascade interleavers, and every grade of interleaver is all made of micro-loop auxiliary MZI, in which: is used
In one end of an arm of two monocycles of the first order interleaver of the adjusting for realizing wavelength and bandwidth and the switching of complementary spectrum
As input terminal, the other end is with the second level interleaver of the switching for realizing wavelength regulation and complementary spectrum without π phase shift
An arm one end be connected；The other end of the arm without π phase shift of second level interleaver is output end.
By designing suitable parameter, box filter spectrum is may be implemented in micro-loop auxiliary MZI.Pass through the wavelength of two-stage interleaver
It adjusts and spectrum handoff functionality realizes that the wavelength of filter continuously adjusts.It is realized by the bandwidth adjustment function of first order interleaver
The bandwidth of filter continuously adjusts.The channel selection function of two-stage interleaver makes in broadband range (such as 20nm) filter
Only one resonance peak.In order to realize the single resonance peak in bigger bandwidth range, three-level or the above interleaver can be cascaded.
Technical effect
Compared with prior art, the present invention has single resonance peak in broadband (such as 20nm), and box filter is composed, and wavelength is continuous
It is adjustable, the continuously adjustable feature of bandwidth, and device size is small, control is simple, low in energy consumption.
Detailed description of the invention
Fig. 1 is the tunable filter schematic diagram based on cascade interweaved device；
Fig. 2 is the tunable filter structure for assisting MZI structure to realize with micro-loop；
Fig. 3 is six kinds of working condition spectral schematics of tunable filter；
Fig. 4 is tunable filter simulated spectra figure.
Specific embodiment
As depicted in figs. 1 and 2, the present embodiment includes: two cascade interleavers, in which: 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.
The broad band wavelength bandwidth tunable filter, transfer function are as follows: T=T1T2, Wherein: T1And T2The biography of one output port of the first order and second level interleaver respectively
Defeated function, AiAnd ti, wherein i=1~4, correspond to the transfer function and directional coupler transmission coefficient of respectively four monocycles；Wherein: k=1~6, i.e. length are lkWaveguide transmission rate, α and β be respectively waveguide loss factor and
Propagation constant, j are imaginary unit；t1~t4Respectively 0.5,0.5,0.785,0.243.
All monocycle 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 is L/2, the monocycle that long-armed connection transmission coefficient is 0.785.The freely frequency of the first order and second level interleaver
Spectral limit (FSR) is respectively 10.912nm and 22.180nm.The filter is realized on SOI platform, and all waveguides are
The single mode waveguide of 450nm × 220nm.
As shown in figure 3, broad band wavelength bandwidth tunable filter described in the present embodiment is, it can be achieved that six kinds of working conditions:
State 1: when being not powered on pressure, the cascade end of first order interleaver exports channel Ch1, Ch3, the output of second level interleaver
End output Ch1.
State 2: if you need to which Ch2 is output to second level interleaver output, then to first order interleaver arm length difference making alive
π phase shift is generated, then adjusts the bandwidth of first order interleaver, makes to cascade end output Ch2, Ch4.
State 3: if you need to which Ch3 is output to second level interleaver output, then to second level interleaver arm length difference making alive
Generating π phase shift can be realized.
State 4: if you need to which Ch4 is output to second level interleaver output, then by the first order and second level interleaver brachium
Poor making alive generates π phase shift, then adjusts the bandwidth of first order interleaver.
State 5: if you need to adjust channel center wavelengths, then by the first order and the identical distance of second level central wavelength red shift.
State 6: if you 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 filter, and simulation result according to Fig.4, the present invention can
With single resonance peak in realization~20nm bandwidth range, squarish filtering spectrum, the wavelength within the scope of~20nm continuously adjust and
Bandwidth from 1.216nm to 2.824nm continuously adjusts.Filter extinction ratio is about 20dB, by increasing the micro- of two-stage interleaver
Ring number can be further improved extinction ratio.
Above-mentioned specific implementation can by those skilled in the art under the premise of without departing substantially from the principle of the invention and objective with difference
Mode carry out local directed complete set to it, protection scope of the present invention is subject to claims and not by above-mentioned specific implementation institute
Limit, each implementation within its scope 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 characterized by comprising at least two cascades
Interleaver, every grade of interleaver all by micro-loop auxiliary MZI constitute, in which: for realizing the adjusting and complementation of wavelength and bandwidth
One end of one arm of two monocycles of the first order interleaver of the switching of spectrum is as input terminal, the other end and for realizing wavelength
It adjusts and one end of the arm without π phase shift of the second level interleaver of the switching of complementary spectrum is connected；Second level interleaver
The other end of one arm of no π phase shift is output end.
2. broad band wavelength bandwidth tunable filter according to claim 1, characterized in that the broad band wavelength bandwidth can
Tunable filter, transfer function are as follows: T=T1T2,Wherein:
T1And T2The transfer function of one output port of the first order and second level interleaver respectively, AiAnd ti, wherein i=1~4, corresponding to divide
Not Wei four monocycles transfer function and directional coupler transmission coefficient；Wherein: k=1~6, i.e. length are
lkWaveguide transmission 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, characterized in that the first order interweaves
Device MZI two-arm length difference is L, and second level interleaver MZI two-arm length difference is L/2, the list that long-armed connection transmission coefficient is 0.785
Ring.
4. broad band wavelength bandwidth tunable filter according to claim 2, characterized in that the first order interleaver
MZI two-arm length difference is L, and second level interleaver MZI two-arm length difference is L/2, the list that long-armed connection transmission coefficient is 0.785
Ring；
A length of L=50.266 μm of the chamber of the monocycle, the waveguide is the single mode waveguide of 450nm × 220nm.
5. broad band wavelength bandwidth tunable filter according to claim 1 or 2, characterized in that the first order and
The free spectral range of second level interleaver is respectively 10.912nm and 22.180nm.
6. broad band wavelength bandwidth tunable filter according to claim 1 or 2 or 4, characterized in that the broad band wavelength bandwidth
The output of tunable filter specifically includes following six kinds of combinations:
State 1: when being not powered on pressure, the cascade end of first order interleaver exports channel Ch1 and Ch3, second level interleaver output
Export Ch1；
State 2: if you need to which Ch2 is output to second level interleaver output, then π is generated to first order interleaver arm length difference making alive
Phase shift, then the bandwidth of first order interleaver is adjusted, make to cascade end output Ch2 and Ch4；
State 3: if you need to which Ch3 is output to second level interleaver output, then π is generated to second level interleaver arm length difference making alive
Phase shift can be realized；
State 4: if you need to which Ch4 is output to second level interleaver output, then the first order and second level interleaver arm length difference are added
Voltage generates π phase shift, then adjusts the bandwidth of first order interleaver；
State 5: if you need to adjust channel center wavelengths, then by the first order and the identical distance of second level central wavelength red shift；
State 6: if you need to adjust channel width, then bandwidth adjustment is carried out to first order interleaver.
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| CN107065073B true CN107065073B (en) | 2019-06-18 |
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| CN110908146A (en) * | 2019-12-12 | 2020-03-24 | 华中科技大学 | Silicon-based integrated tunable band-pass filter |
| 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 |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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| WO2005084308A2 (en) * | 2004-03-01 | 2005-09-15 | Sarnoff Corporation | Photonic device and method for making same |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
|---|
| Compact Silicon Photonic Interleaver Using Loop-Mirror-Based Michelson-Gires-Tournois Interferometer;Xinhong Jiang etal;《OFC 2016》;Optical Society of America;20161231;全文 |
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