CN105572806A - Optical filtering device based on silicon-based double-Sagnac-loop-mirror loop structure - Google Patents

Optical filtering device based on silicon-based double-Sagnac-loop-mirror loop structure Download PDF

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CN105572806A
CN105572806A CN201510952930.1A CN201510952930A CN105572806A CN 105572806 A CN105572806 A CN 105572806A CN 201510952930 A CN201510952930 A CN 201510952930A CN 105572806 A CN105572806 A CN 105572806A
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sagnac
silica
waveguide
loop structure
loop mirror
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CN105572806B (en
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姜新红
苏翼凯
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Shanghai Jiaotong University
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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
    • G02B6/29304—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 diffraction, e.g. grating
    • G02B6/29316—Light guides comprising a diffractive element, e.g. grating in or on the light guide such that diffracted light is confined in the light guide
    • G02B6/29317—Light guides of the optical fibre type
    • G02B6/29319—With a cascade of diffractive elements or of diffraction operations
    • G02B6/2932—With a cascade of diffractive elements or of diffraction operations comprising a directional router, e.g. directional coupler, circulator
    • 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
    • G02B6/29304—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 diffraction, e.g. grating
    • G02B6/29316—Light guides comprising a diffractive element, e.g. grating in or on the light guide such that diffracted light is confined in the light guide
    • G02B6/29317—Light guides of the optical fibre type
    • 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

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
  • Optical Integrated Circuits (AREA)

Abstract

An optical filtering device based on a silicon-based double-Sagnac-loop-mirror loop structure comprises two Sagnac loop mirrors and a directional coupler, wherein waveguides on one side of the two Sagnac loop mirrors are connected, waveguides on the other side are respectively connected with two waveguides on one side of the directional coupler, and an input port, a transmission port and a reflection port are arranged at the other side of the directional coupler. According to the invention, the coupling coefficient of each coupler and the length of each waveguide are adjusted, and the transmission function and the reflection function of the double-Sagnac-loop-mirror loop structure can be changed, so that an interleaver adjustable in wavelength and a comb filter adjustable both in wavelength and bandwidth are realized; in addition, the size is small, the adjusting efficiency is high, and the extinction ratio is high.

Description

Based on the optical filter part of silica-based pair of sagnac loop mirror loop structure
Technical field
What the present invention relates to is a kind of technology of fiber optic communication field, specifically a kind of optical filter part based on silica-based pair of sagnac loop mirror loop structure.
Background technology
Silicon based photon device has the characteristic of strong mould field containment, and advantage that can be compatible mutually with complementary metal oxide semiconductor (CMOS) CMOS technology, be the ideal chose of integrated optical circuit.Silicon based photon device mainly comprises wave filter, modulator, light open circuit, router and detector etc.In reconfigurable network, adjustable filter is the important device of a class, comprises Wavelength tunable interleaver and adjustable comb-shaped filter etc.
Through finding prior art retrieval, JunfengSong etc. are published in OpticsExpress in 2008, the paper " Proposedsiliconwireinterleaverstructure " of the 16th volume 11 phase proposes the annular interleaver based on add drop multiplex type toroidal cavity resonator ADRR and Mach-Zehnder interferometer MZI, the signal utilizing the Drop of ADRR end and Through end to export has the feature of π phase differential, the compact interleaver with box filter spectrum is achieved with an ADRR, but it does not adopt reflective structure to reduce device size further and improve and regulates efficiency.
Further retrieval finds, the people such as XiaomengSun are published in OpticLetter in 2012, the paper " TunablesiliconFabry – PerotcombfiltersformedbySagnacloopmirrors " of the 38th volume the 4th phase proposes scheme silicon wafer SOI on insulator achieving centre wavelength tunable optical frequency comb wave filter, by adding the movement that external voltage realizes filter center wavelength at PN junction, but the program can not carry out the adjustment of filter bandwidht.
Chinese patent literature CN103941430A, publication date is on 07 23rd, 2014, disclose a kind of tunable optical frequency comb wave filter based on silica-based FP resonator cavity of technical field of optical fiber communication, the FP resonator cavity that this optical frequency comb wave filter is made up of the Sagnac-ring catoptron SLR of two cascades realizes.Changed the reflectivity of the long and SLR in the chamber of FP resonator cavity with the Mach-Zehnder interferometer of phase shifter by two-arm, thus the centre wavelength of adjustment optical frequency comb wave filter and bandwidth respectively.Centre wavelength regulate be phase shift by adding plus or minus in MZI two-arm simultaneously to change the reflectivity of SLR, thus the bandwidth of adjustment wave filter.But the transition function of this device does not have zero point, High Extinction Ratio can not be realized.
Summary of the invention
The present invention is directed to prior art above shortcomings, propose a kind of optical filter part based on silica-based pair of sagnac loop mirror loop structure.The function of Wavelength tunable interleaver and the equal adjustable comb-shaped filter of wavelength bandwidth can be realized by changing coupling coefficient, and improve extinction ratio.
The present invention is achieved by the following technical solutions:
The present invention includes: two sagnac loop mirror (SLM, SagnacLoopMirror) and one directional coupler, wherein: a side waveguide of two SLM is connected, opposite side waveguide is connected with two waveguides of directional coupler side respectively, directional coupler opposite side is provided with input port, transmission port and reflector port, by regulating the length of the coupling coefficient of each coupling mechanism and each section of waveguide, transmission function and the reflective function of two sagnac loop mirror loop structure can be changed, thus realize Wavelength tunable interleaver and the equal adjustable comb-shaped filter of wavelength bandwidth;
Described transmission function t lSwith reflective function r lSfor:
t L S = a 1 2 ( ( t 1 2 - k 1 2 ) t F P + jt 1 k 1 ( r FP 1 + r FP 2 ) ) ,
r L S = a 1 2 ( t 1 2 r FP 1 - k 1 2 r FP 2 + 2 jt 1 k 1 t F P ) ,
t F P = t s 2 t s 3 a 3 / ( 1 - r s 2 r s 3 a 3 2 ) ,
r FP 1 = 2 ja 2 ( t 2 k 2 + a 2 2 a 3 2 t 3 k 3 ) / ( 1 - r s 2 r s 3 a 3 2 ) ,
r FP 2 = 2 ja 2 ( t 3 k 3 + a 2 2 a 3 2 t 2 k 2 ) / ( 1 - r s 2 r s 3 a 3 2 ) ,
t s i = ( t i 2 - k i 2 ) a 1 , ( i = 2 , 3 ) ,
r s i = - 2 jt i k i a 1 , ( i = 2 , 3 ) ,
t i 2+r i 2＝1(i＝1,2,3)，
a i＝exp(-αl i-jβl i)(i＝1,2,3)，
β＝2πn g/λ，
Wherein: t fPand r fPbe respectively two SLM be connected after transmission function and reflective function, with be respectively transmission function and the reflective function of single SLM, a ithe transfer rate of each section of waveguide, t iand r ifor coupling coefficient and the transmission coefficient of each coupling mechanism, l ibe the length of each section of waveguide, α and β is loss factor and the propagation constant of waveguide.N gfor group index, λ is wavelength.
Described sagnac loop mirror is connected to form by the same side ports of directional coupler two sections of waveguides, wherein: two ports of opposite side are as input port and delivery outlet.
Described directional coupler is made up of two sections of adjacent parallel waveguides, realizes optical power fluctuation by evanscent field coupling.
Described input port, transmission port and reflector port are made up of grating coupler.
Technique effect
Compared with prior art, the present invention can realize the function of Wavelength tunable interleaver and the equal adjustable comb-shaped filter of wavelength bandwidth by adjustment coupling coefficient and waveguide length, and size is little, and regulate efficiency high, extinction ratio is high.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is interleaver functional simulation spectrogram;
Fig. 3 is that the centre wavelength of interleaver function regulates simulated spectra figure;
Fig. 4 is comb filter functional simulation spectrogram;
Fig. 5 is that the centre wavelength of comb filter function regulates simulated spectra figure;
Fig. 6 is the bandwidth control simulated spectra figure of comb filter function.
Embodiment
Elaborate to embodiments of the invention below, the present embodiment is implemented under premised on technical solution of the present invention, give 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 present embodiment comprises: two sagnac loop mirror SLM and directional couplers, wherein: SLM and coupling mechanism series connection form two sagnac loop mirror loop structure, and the waveguide length after connection is respectively l 1, l 1and l 3, directional coupler side is provided with input port I, transmission port T and reflector port R.The coupling coefficient of three coupling mechanisms is respectively t 1, t 2and t 3.
Described SLM refers to and the same side ports of directional coupler is coupled together, and its waveguide length is l 2, opposite side two ports, respectively as the optical device of input and output port, while importing light into input port, are also reflected back input port.Directional coupler refers to and is made up of two sections of adjacent parallel waveguides, is realized the optical device of optical power fluctuation by evanscent field coupling.
By changing the coupling coefficient t of each coupling mechanism 1, t 2, t 3with the length l of each section of waveguide 1, l 2, l 3, change the transmission function t of two sagnac loop mirror loop structure lSwith reflective function r lS, wherein:
t L S = a 1 2 ( ( t 1 2 - k 1 2 ) t F P + jt 1 k 1 ( r FP 1 + r FP 2 ) ) ;
r L S = a 1 2 ( t 1 2 r FP 1 - k 1 2 r FP 2 + 2 jt 1 k 1 t F P ) ;
t F P = t s 2 t s 3 a 3 / ( 1 - r s 2 r s 3 a 3 2 ) ;
r FP 1 = 2 ja 2 ( t 2 k 2 + a 2 2 a 3 2 t 3 k 3 ) / ( 1 - r s 2 r s 3 a 3 2 ) ;
r FP 2 = 2 ja 2 ( t 3 k 3 + a 2 2 a 3 2 t 2 k 2 ) / ( 1 - r s 2 s 3 ra 3 2 ) ;
r s i = - 2 jt i k i a 1 , ( i = 2 , 3 ) ;
t i 2+r i 2＝1(i＝1,2,3)；
a i＝exp(-αl i-jβl i)(i＝1,2,3)；
β＝2πn g/λ；
Wherein: t fPand r fPbe respectively two SLM be connected after transmission function and reflective function, with be respectively transmission function and the reflective function of single SLM, a ithe transfer rate of each section of waveguide, t iand r ifor coupling coefficient and the transmission coefficient of each coupling mechanism, l ibe the length of each section of waveguide, α and β is loss factor and the propagation constant of waveguide.N gfor group index, λ is wavelength.
Regulate t imake t lS(t in formula 1 2-k 1 2) t fPand jt 1k 1( ) be 2n π (n is integer) at filter pass band phase differential, the phase differential in stopband is (2n+1) π (n is integer), can realize Wavelength tunable interleaver function.Its centre wavelength can pass through l 3regulate.By t 1be set to 0.707, pass through t 2regulate filter bandwidht, bandwidth adjustable comb-shaped filter function can be realized.Its centre wavelength can pass through l 3regulate.In reflective function, introduce zero point, can extinction ratio be improved.
The parameter of described two sagnac loop mirror loop structures is: l 1=10 μm, l 2=10 μm, l 3=200 μm.This structure can realize on SOI platform, and all waveguides are the single mode waveguide of 450nm × 220nm.In emulation, the group index of waveguide is 4.3, and loss factor is 160.
Described input port, transmission port and reflector port are made up of grating coupler, and realization is coupled with single-mode fiber.
As shown in Figure 2, for realizing Wavelength tunable interleaver function, parameter is set to: t 1=0.382, t 2=0.25, t 3=0.23.Free spectral range FSR=2.631nm, 3-dB bandwidth BW=1.310nm, Extinction ratio=43.04170dB, Insertion Loss IL=0.2654dB.Its wavelength regulation is by changing l 3realize.According to phase shift formula in emulation, the waveguide index change caused by impressed voltage is equivalent to waveguide length change.For reflectance spectrum as shown in Figure 3, when waveguide length change is increased to 0.28 μm by 0.20 μm, centre wavelength red shift 0.588nm.
As shown in Figure 4, for realizing the equal adjustable comb-shaped filter function of wavelength bandwidth, coupling coefficient is: t 1=0.707, t 2=0.707, t 3=0.36.Visible in figure, FSR=1.331nm, BW=1.331nm, ER=42.88983dB, IL=1.41360dB.Its wavelength regulation is by changing l 3realize, as shown in Figure 5, as waveguide length l 3when being increased to 0.28um by 0.2um, centre wavelength red shift is 0.586nm.Its bandwidth control passes through t 3realize, as shown in Figure 6, work as t 3when being increased to 0.45 by 0.25, bandwidth reduces to 0.120nm by 0.305nm.
Compared with prior art, by the function regulating coupling coefficient and waveguide length to realize Wavelength tunable interleaver and the equal adjustable comb-shaped filter of wavelength bandwidth, and size is little for this device, and regulate efficiency high, extinction ratio is high.

Claims (9)

1. the optical filter part based on silica-based pair of sagnac loop mirror loop structure, it is characterized in that, comprise: two sagnac loop mirror SLM and directional couplers, wherein: a side waveguide of two SLM is connected, opposite side waveguide is connected with two waveguides of directional coupler side respectively, and directional coupler opposite side is provided with input port, transmission port and reflector port.By regulating the length of the coupling coefficient of each coupling mechanism and each section of waveguide, transmission function and the reflective function of two sagnac loop mirror loop structure can be changed, thus realize Wavelength tunable interleaver and the equal adjustable comb-shaped filter of wavelength bandwidth;
Described transmission function t lSwith reflective function r lSfor:
t L S = a 1 2 ( ( t 1 2 - k 1 2 ) t F P + jt 1 k 1 ( r FP 1 + r FP 2 ) ) ,
r L S = a 1 2 ( t 1 2 r FP 1 - k 1 2 r FP 2 + 2 jt 1 k 1 t F P ) ,
t F P = t s 2 t s 3 a 3 / ( 1 - r s 2 r s 3 a 3 2 ) ,
r FP 1 = 2 ja 2 ( t 2 k 2 + a 2 2 a 3 2 t 3 k 3 ) / ( 1 - r s 2 r s 3 a 3 2 ) ,
r FP 2 = 2 ja 2 ( t 3 k 3 + a 2 2 a 3 2 t 2 k 2 ) / ( 1 - r s 2 r s 3 a 3 2 ) ,
t s i = ( t i 2 - k i 2 ) a 1 ( i = 2 , 3 ) ,
r s i = - 2 jt i k i a 1 ( i = 2 , 3 ) ,
t i 2+r i 2＝1(i＝1,2,3)，
a i＝exp(-αl i-jβl i)(i＝1,2,3)，
β＝2πn g/λ，
Wherein: t fPand r fPbe respectively two SLM be connected after transmission function and reflective function, with be respectively transmission function and the reflective function of single SLM, a ithe transfer rate of each section of waveguide, t iand r ifor coupling coefficient and the transmission coefficient of each coupling mechanism, l ibe the length of each section of waveguide, α and β is loss factor and the propagation constant of waveguide, n gfor group index, λ is wavelength.
2. the optical filter part based on silica-based pair of sagnac loop mirror loop structure according to claim 1, it is characterized in that, described sagnac loop mirror is connected to form by the same side ports of directional coupler two sections of waveguides, wherein: two ports of opposite side are as input port and delivery outlet.
3. the optical filter part based on silica-based pair of sagnac loop mirror loop structure according to claim 2, is characterized in that, described directional coupler is made up of two sections of adjacent parallel waveguides, realizes optical power fluctuation by evanscent field coupling.
4. the optical filter part based on silica-based pair of sagnac loop mirror loop structure according to claim 1, it is characterized in that, described input port, transmission port and reflector port are made up of grating coupler.
5. the optical filter part based on silica-based pair of sagnac loop mirror loop structure according to claim 1, is characterized in that, regulates t imake t lS(t in formula 1 2-k 1 2) t fPwith be 2n π at filter pass band phase differential, wherein n is integer, and the phase differential in stopband is (2n+1) π, and namely realize Wavelength tunable and interweave, its centre wavelength passes through l 3regulate.
6. the optical filter part based on silica-based pair of sagnac loop mirror loop structure according to claim 1, is characterized in that, by t 1be set to 0.707, pass through t 2regulate filter bandwidht, namely realize the adjustable comb filtering of bandwidth, its centre wavelength passes through l 3regulate.
7. the optical filter part based on silica-based pair of sagnac loop mirror loop structure according to above-mentioned arbitrary claim, is characterized in that, the parameter of described two sagnac loop mirror loop structures is: l 1=10 μm, l 2=10 μm, l 3=200 μm, wherein all waveguides are the single mode waveguide of 450nm × 220nm.
8. the optical filter part based on silica-based pair of sagnac loop mirror loop structure according to claim 5, is characterized in that, the parameter that described Wavelength tunable interweaves is: t 1=0.382, t 2=0.25, t 3=0.23, free spectral range=2.631nm, 3-dB bandwidth=1.310nm, extinction ratio=43.04170dB, Insertion Loss=0.2654dB.
9. the optical filter part based on silica-based pair of sagnac loop mirror loop structure according to claim 6, is characterized in that, described wavelength bandwidth is all adjustable comb filtering, and its coupling coefficient is: t 1=0.707, t 2=0.707, t 3=0.36, free spectral range=1.331nm, 3-dB bandwidth=1.331nm, extinction ratio=42.88983dB, Insertion Loss=1.41360dB.
CN201510952930.1A 2015-12-17 2015-12-17 Optical filter part based on the double sagnac loop mirror loop structures of silicon substrate Expired - Fee Related CN105572806B (en)

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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
CN109581586A (en) * 2019-01-10 2019-04-05 上海理工大学 A kind of sub- chip of compact type silicon nitride wavelength division multiplexed light
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
CN113991266A (en) * 2021-10-12 2022-01-28 北京理工大学 Broadband microwave photon phase shifter with constant output power
CN114464970A (en) * 2022-02-10 2022-05-10 南京信息工程大学 Terahertz band elimination filter based on sagnac loop

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CN114464970A (en) * 2022-02-10 2022-05-10 南京信息工程大学 Terahertz band elimination filter based on sagnac loop

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