CN103941430A - Adjustable light frequency comb filter based on silicon-based FP resonant cavity - Google Patents
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Abstract
An adjustable light frequency comb filter based on a silicon-based FP resonant cavity in the technical field of optical fiber communication is achieved by an FP resonant cavity consisting of two cascaded SLRs. The length of the and the reflection rate of the SLRs are changed through a Mach-Zehnder interferometer provided with phase shifters on two arms, accordingly the central wave length and band width of the adjustable light frequency comb filter are respectively adjusted. The central wave length adjustment is achieved by simultaneously performing positive or negative phase shifting on two MZI arms to change the length of the FP resonant cavity, and accordingly the central wave length of the filter is adjusted. The band width adjustment is achieved by respectively performing positive or negative phase shifting on two MZI arms to change the reflection rate of the SLRs, and accordingly the band width of the filter is adjusted. The central wave length and the band width of the filter can be independently adjusted, and the adjustable light frequency comb filter based on the silicon-based FP resonant cavity has the advantages of being small in size, simple in structure and easy to integrate in a large-scale mode.
Description
Technical field
What the present invention relates to is a kind of device of technical field of optical fiber communication, specifically a kind of based on silica-based Fa Bu Li ?the wavelength bandwidth adjustable optical frequency comb wave filter simultaneously of Perot (FP) resonator cavity.
Background technology
Silicon based photon device has advantages of strong mould field containment characteristic with compatible mutually with CMOS technique, is the ideal chose of integrated optical circuit.Silicon based photon device mainly comprises wave filter, modulator, photoswitch, router and detector etc.Optical frequency comb wave filter can carry out Route Selection and blocking-up to multi-wavelength signals, in wavelength-division multiplex (WDM) system, has extensive utilization.With respect to the optical frequency comb wave filter based on fiber optics, on sheet, have can large-scale integrated for integrated optical frequency comb wave filter, low in energy consumption and stability advantages of higher.
Through the retrieval of prior art is found, the people such as Shanshan Wang are published in Optics Letters in 2009, the paper of the 34th the 3rd phase of volume " All ?fiber Fabry – Perot resonators based on microfiber Sagnac loop mirrors " has proposed all adjustable optical frequency comb wave filters of centre wavelength based on micro-nano fiber Sagnac catoptron and bandwidth, by the microoperation of micro-nano fiber having been realized to the adjusting of filter wavelength and bandwidth, yet it is integrated that this scheme is not suitable on sheet, microoperation method is also not easy to large-scale production.
Further these retrieval is found, the people such as Xiaomeng Sun are published in Optics Letters in 2012, the paper of the 38th the 4th phase of volume " Tunable silicon Fabry – Perot comb filters formed by Sagnac loop mirrors " has proposed to realize the scheme of centre wavelength tunable optical frequency comb wave filter in Silicon-On-Insulator wafer (SOI), by add the movement that external voltage is realized filter center wavelength at PN junction, but this scheme can not be carried out the adjusting of filter bandwidht.
Chang ?seok Kim at " Electro ?optic wavelength ?tunable fiber ring laser based on cascaded composite sagnac loop filters " (Optics letters, VOL.29, NO.14, 1677 ?1679, 2004 ?7 ?15) a kind of electric light tunable wave length optical fiber ring laser that is unified into Sagnac-ring wave filter based on level is disclosed, comprise one-way isolator, there is laser diode-pumped Er-doped fiber active area, also comprise 50/50 coupling mechanism, the first Sagnac loop filter, the second Sagnac loop filter, the output terminal of Er-doped fiber active area is connected with the first Sagnac loop filter, second Sagnac loop filter of first and second Sagnac loop filter cascade is connected with the output terminal of erbium-doped fiber active area through one-way isolator, whole device is loop configuration.But this technology can not regulate the bandwidth of wave filter, and the Sagnac-ring based on optical fiber is not suitable on sheet integrated.
Chinese patent literature CN101132102 open (bulletin) day 2008.02.27, a kind of single longitudinal mode ring laser based on wave filter with double Sagnac rings is disclosed, comprise: laser amplifier, one-way isolator, 30/70 coupling mechanism, the first Sagnac loop filter, the second Sagnac loop filter, annexation is: the output terminal of laser amplifier is connected with first Sagnac loop filter through 70% port of 30/70 coupling mechanism, first Sagnac loop filter is connected with second Sagnac loop filter, second Sagnac loop filter is connected with the input end of laser amplifier through one-way isolator, whole apparatus structure is loop configuration.But this technology can not realize the adjusting of filter wavelength and bandwidth, owing to adopting optical fiber and Polarization Controller to form Sagnac-ring, be not therefore suitable on sheet integrated.
Summary of the invention
The present invention is directed to prior art above shortcomings, a kind of tunable optical frequency comb wave filter based on silica-based FP resonator cavity is provided, by two arms, with the Mach-Zehnder interferometer (MZI) of phase shifter, realize the adjusting of filter center wavelength and bandwidth.This optical frequency comb wave filter has compact conformation, is easy to the integrated advantage of large-scale production.
The present invention is achieved by the following technical solutions:
The present invention relates to a kind of tunable optical frequency comb wave filter based on silica-based FP resonator cavity, comprise: the filter sub-unit of at least two series connection, each filter sub-unit by two arms with the MZI of phase shifter and one with it the Sagnac catoptron (SLR) of cascade form, wherein: the SLR of cascade forms FP resonator cavity, by MZI, change the chamber length of FP resonator cavity and the reflectivity of SLR, thereby regulate centre wavelength and the bandwidth of optical frequency comb wave filter.
Described Sagnac catoptron (SLR) is that the side ports by two sections of waveguides of directional coupler connects to form, wherein: the opposite side port of two sections of waveguides is respectively as input and output.When this catoptron imports light into output port, be also reflected back input port.
Described directional coupler refers to by two sections of adjacent parallel waveguides and forms, and by evanscent field, is coupled and is realized the optical device that luminous power is distributed.
Described FP resonator cavity refers to: the optical resonance device being comprised of catoptron, have periodic transmittance graph.
Described Mach-Zehnder interferometer (MZI), by changing the phase shift of phase shifter on two arms, is realized incident light is divided into the emergent light that two-beam path difference is different, thereby can change the luminous power distribution of two output ports.
Described phase shifter refers to by making alive on PN junction and changes waveguide index, thereby changes the device of light field phase place.
Described optical frequency comb wave filter has the transmittance graph that passband and stopband by a plurality of uniformly-spaced frequency permutation form, and this optical frequency comb wave filter is only by the light signal in some particular frequency range.
Described centre wavelength regulates and refers to: by long to change FP resonator in the phase shift of additional plus or minus simultaneously of MZI two arms, thus the centre wavelength of adjusting wave filter.
Described bandwidth control refers to: by MZI two arms respectively the phase shift of additional positive and negative to change SLR reflectivity, thereby regulate the bandwidth of wave filter.
Technique effect
Compared with prior art, centre wavelength of the present invention and bandwidth can independent regulation, and have compact conformation, are easy to the integrated advantage of large-scale production.
Accompanying drawing explanation
Fig. 1 is the optical frequency comb filter graph architecture based on silica-based FP resonator cavity.
Fig. 2 is that two arms are with the MZI schematic diagram of phase shifter.
Fig. 3 is that the centre wavelength of optical frequency comb wave filter regulates simulated spectra figure.
Fig. 4 is the bandwidth control simulated spectra figure of optical frequency comb wave filter.
Embodiment
Below embodiments of the invention are elaborated, the present embodiment is implemented take technical solution of the present invention under prerequisite, provided detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
Embodiment 1
As shown in Figure 1, the simultaneously adjustable optical frequency comb filter graph architecture of the wavelength bandwidth of the present embodiment based on silica-based FP resonator cavity, comprise: SLR, MZI, phase shifter and input and output port, wherein: phase shifter is added on two arms of MZI, this MZI is connected with SLR, be used for changing FP resonator length and SLR reflectivity, thereby regulate centre wavelength and the bandwidth of wave filter.
Described Sagnac catoptron is comprised of with one section of curved waveguide that is connected both sides output port a directional coupler.
Described FP resonator cavity refers to the optical resonance device being comprised of two catoptrons, and it has periodic transmittance graph.
Described MZI coupling mechanism is connected waveguide and forms with two sections by two directional couplers, and two directional couplers are three-dB coupler.Two arms at MZI add phase shifter, and by changing the phase shift of MZI two arms, the luminous power that can change two output ports is distributed.
Described phase shifter, by adopting ion injection method to form PN junction on silica-based, is realized the phase shift of plus or minus at PN junction two ends introducing bias voltage forward or backwards.
Described optical frequency comb wave filter refers to the optical filter that transmittance graph is comprised of many passbands of uniformly-spaced arranging with certain frequency and stopband, and it only allows the light signal in some particular frequency range pass through.
Described optical frequency comb filter transfer function is:
R
s=2ja
2(a
1+ a
3) (a
1kt
3-a
3k
3t), wherein: t
sand r
sbe respectively transmission and the reflective function with the SLR of MZI, t and k are respectively transmission and the coupling coefficient of directional coupler.A
i=exp (α l
i-j β l
i) (i=1,2,3,4) be the transfer rate of each section of waveguide.α and β are respectively loss factor and the propagation constants of waveguide.The waveguide length of MZI two arms is respectively l
1=260.631um and l
3=260.531um, SLR curved waveguide length l
2=101.5 μ m, the waveguide length l of two MZI of connection
4=25.1 μ m, directional coupler length l
c=9 μ m.Designed directional coupler be 3 ?dB coupling mechanism.This optical frequency comb wave filter is realized on SOI platform, and all waveguides are the 1550nm wave band single mode waveguide of 450nm * 220nm.
Described input/output port is comprised of grating coupler, can realize the coupling of device and single-mode fiber.
It is by long to change FP resonator in the phase shift of additional plus or minus simultaneously of MZI two arms that described centre wavelength regulates, thus the centre wavelength of adjusting wave filter.
Described bandwidth control be by MZI two arms respectively the phase shift of additional positive and negative to change SLR reflectivity, thereby regulate the bandwidth of wave filter.
As shown in Figure 2, by add phase shifter on MZI two arms, realize the independent regulation of FP resonator length and SLR reflectivity.As shown in Fig. 2 (a), by all adding positive phase shift at MZI two arms, can realize that when not changing SLR reflectivity, to change FP resonator long, thereby regulate the centre wavelength of optical frequency comb wave filter.As shown in Fig. 2 (b), by add respectively the phase shift of positive and negative at MZI two arms, can realize when not changing FP resonator length and change SLR reflectivity, thereby regulate optical frequency comb filter bandwidht.
Fig. 3 has provided the simulated spectra figure of filter center wavelength regulation.By add at MZI two arms the red shift that positive phase shift realizes optical frequency comb filter center wavelength simultaneously.According to phase shift formula
the waveguide index in emulation, impressed voltage being caused (n) changes the variation that is equivalent to waveguide length (L).When waveguide length variation is increased to 0.24 μ m by 0.20 μ m, centre wavelength has moved 0.188nm, and bandwidth remains unchanged.
Fig. 4 has provided the simulated spectra figure that filter bandwidht regulates.By add respectively the phase shift of positive and negative at MZI two arms, realize the change of optical frequency comb filter bandwidht.When waveguide length variation is increased to 0.160 μ m by 0.140 μ m, the bandwidth of wave filter is reduced to 3.996GHz by 19.482GHz, and centre wavelength remains unchanged.
Claims (8)
1. the tunable optical frequency comb wave filter based on silica-based FP resonator cavity, it is characterized in that, comprise: the filter sub-unit of at least two series connection, each filter sub-unit by two arms with the MZI of phase shifter and one with it the Sagnac catoptron of cascade form, wherein: the SLR of cascade forms FP resonator cavity, by MZI, change the chamber length of FP resonator cavity and the reflectivity of SLR, thereby regulate centre wavelength and the bandwidth of optical frequency comb wave filter;
Described optical frequency comb filter transfer function is:
R
s=2ja
2(a
1+ a
3) (a
1kt
3-a
3k
3t), wherein: t
sand r
sbe respectively transmission and the reflective function with the SLR of MZI, t and k are respectively transmission and the coupling coefficient of directional coupler; a
i=exp (α l
i-j β l
i), i=1,2,3,4th, the transfer rate of each section of waveguide; α and β are respectively loss factor and the propagation constants of waveguide.
2. tunable optical frequency comb wave filter according to claim 1, is characterized in that, described Sagnac catoptron is that the side ports by two sections of waveguides of directional coupler connects to form, wherein: the opposite side port of two sections of waveguides is respectively as input and output.When this catoptron imports light into output port, be also reflected back input port.
3. tunable optical frequency comb wave filter according to claim 1, is characterized in that, described directional coupler refers to by two sections of adjacent parallel waveguides and forms, and by evanscent field, is coupled and is realized the optical device that luminous power is distributed.
4. tunable optical frequency comb wave filter according to claim 1, is characterized in that, described FP resonator cavity refers to: the optical resonance device being comprised of catoptron, have periodic transmittance graph.
5. tunable optical frequency comb wave filter according to claim 1, it is characterized in that, described Mach-Zehnder interferometer, by changing the phase shift of phase shifter on two arms, is realized incident light is divided into the emergent light that two-beam path difference is different, thereby can change the luminous power distribution of two output ports.
6. tunable optical frequency comb wave filter according to claim 1, it is characterized in that, described optical frequency comb wave filter has the transmittance graph that passband and stopband by a plurality of uniformly-spaced frequency permutation form, and this optical frequency comb wave filter is only by the light signal in some particular frequency range.
7. tunable optical frequency comb wave filter according to claim 1, is characterized in that, described centre wavelength regulates and refers to: by long to change FP resonator in the phase shift of additional plus or minus simultaneously of MZI two arms, thus the centre wavelength of adjusting wave filter.
8. tunable optical frequency comb wave filter according to claim 1, is characterized in that, described bandwidth control refers to: by MZI two arms respectively the phase shift of additional positive and negative to change SLR reflectivity, thereby regulate the bandwidth of wave filter.
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| CN105572806A (en) * | 2015-12-17 | 2016-05-11 | 上海交通大学 | Optical filtering device based on silicon-based double-Sagnac-loop-mirror loop structure |
| CN105700082A (en) * | 2016-04-11 | 2016-06-22 | 上海交通大学 | Adjustable interleaver based on silicon-substrate Michelson GT interferometer |
| CN106019641A (en) * | 2016-03-08 | 2016-10-12 | 中国人民解放军空军工程大学 | Method for generating polarization orthogonal dual-wavelength optical signal with large tuning range for frequency interval, and device thereof |
| CN107065073A (en) * | 2017-04-20 | 2017-08-18 | 上海交通大学 | Broad band wavelength bandwidth tunable filter based on cascade interweaved device |
| CN107817062A (en) * | 2017-10-20 | 2018-03-20 | 黑龙江工程学院 | A kind of oscillograph detection temperature sensor in parallel with FP chambers based on Sagnac rings |
| CN110595527A (en) * | 2019-09-10 | 2019-12-20 | 中国人民解放军国防科技大学 | Calibration method for controllable phase shifter in multistage staggered Mach-Zehnder interferometer on optical chip |
| CN111174708A (en) * | 2020-01-13 | 2020-05-19 | 山西大学 | Method and device for measuring cavity length of micro-optical resonant cavity |
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| CN112147740A (en) * | 2020-10-22 | 2020-12-29 | 重庆邮电大学 | Multi-working-frequency-band programmable microwave photonic filter based on integrated silicon waveguide |
| CN113991266A (en) * | 2021-10-12 | 2022-01-28 | 北京理工大学 | Broadband microwave photon phase shifter with constant output power |
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| CN105572806B (en) * | 2015-12-17 | 2018-10-26 | 上海交通大学 | Optical filter part based on the double sagnac loop mirror loop structures of silicon substrate |
| CN106019641B (en) * | 2016-03-08 | 2019-02-12 | 中国人民解放军空军工程大学 | A kind of polarized orthogonal dual wavelength light signal generation device with frequency interval |
| CN106019641A (en) * | 2016-03-08 | 2016-10-12 | 中国人民解放军空军工程大学 | Method for generating polarization orthogonal dual-wavelength optical signal with large tuning range for frequency interval, and device thereof |
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| CN105700082B (en) * | 2016-04-11 | 2018-09-21 | 上海交通大学 | Adjustable interleaver based on silicon substrate Michelson GT interferometers |
| CN107065073A (en) * | 2017-04-20 | 2017-08-18 | 上海交通大学 | Broad band wavelength bandwidth tunable filter based on cascade interweaved device |
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| CN107817062A (en) * | 2017-10-20 | 2018-03-20 | 黑龙江工程学院 | A kind of oscillograph detection temperature sensor in parallel with FP chambers based on Sagnac rings |
| CN107817062B (en) * | 2017-10-20 | 2018-09-07 | 黑龙江工程学院 | A kind of oscillograph detection temperature sensor in parallel with FP chambers based on Sagnac rings |
| CN110595527A (en) * | 2019-09-10 | 2019-12-20 | 中国人民解放军国防科技大学 | Calibration method for controllable phase shifter in multistage staggered Mach-Zehnder interferometer on optical chip |
| CN111174708A (en) * | 2020-01-13 | 2020-05-19 | 山西大学 | Method and device for measuring cavity length of micro-optical resonant cavity |
| CN111174708B (en) * | 2020-01-13 | 2021-03-30 | 山西大学 | Method and device for measuring cavity length of micro-optical resonant cavity |
| CN111290145A (en) * | 2020-03-03 | 2020-06-16 | 联合微电子中心有限责任公司 | High-speed modulator based on annular reflector |
| CN112147740A (en) * | 2020-10-22 | 2020-12-29 | 重庆邮电大学 | Multi-working-frequency-band programmable microwave photonic filter based on integrated silicon waveguide |
| CN113991266A (en) * | 2021-10-12 | 2022-01-28 | 北京理工大学 | Broadband microwave photon phase shifter with constant output power |
| CN114488377A (en) * | 2022-02-08 | 2022-05-13 | 山东大学 | Method for filtering partial coherent noise in light beam by using resonant cavity structure |
| CN114488377B (en) * | 2022-02-08 | 2022-12-20 | 山东大学 | Method for filtering partial coherent noise in light beam by using resonant cavity structure |
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