CN102722000B - Method for implementing microwave photonic filter based on photonic crystal - Google Patents
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Abstract
The invention relates to a method for implementing a microwave photonic filter based on a photonic crystal. A bent waveguide integrated coupling beam splitter and a slow light waveguide delay line are used on the same photonic crystal, so that a system function of the filter has the bandpass filter characteristic of trapped wave depth of 10dB in a free frequency spectral range of 130 GHz at 1,550 nanometers; and the function of filtering residual edge bands of a light generation millimeter wave signal can be realized. By using a bidimensional photonic crystal structure compared with an optical fiber ring structure, the size of the filter can be greatly reduced; and the method is favorable for minimizing and integrating the device.
Description
Technical field
The present invention relates to a kind of microwave photon filter based on photonic crystal, belong to optical filter technical field.
Background technology
The most of communication service of China at present all concentrates on below 3GHz, and existing low frequency band frequency resource is nearly all occupied, but for the less utilization of frequency resource more than 3GHz, particularly for the high loss window of two propagation in atmosphere of 24GHz and 60GHz frequency range.Exempt from licensed band in order to make full use of 60GHz, RoF technology is arisen at the historic moment, and this technology is fully in conjunction with the feature of optical fiber and high frequency radio wave transmission, and radiofrequency signal wire transmission cheaply and super wideband wireless access.
Generally speaking, RoF system utilizes radio-frequency oscillator that baseband signal is converted to radio frequency band, and driven modulator is loaded into radiofrequency signal on light carrier and produces photoproduction millimeter-wave signal then, and light signal is transferred to base station by single-mode fiber afterwards.In the generation and transmitting procedure of photoproduction millimeter wave, signal dispersion and Insertion Loss all can be introduced noise on the one hand, transmission length and the transmission quality of undesired signal, double-side band transmission easily causes peak-to-peak interference on the other hand, so RoF system need to be come filtering noise and unnecessary sideband with wave filter.But traditional microwave filter, due to the existence of electronic bottleneck, almost cannot be processed microwave signal more than 10GHz, thereby the technology of utilizing photon method to process high-frequency microwave has received more and more researcher's concern both at home and abroad.Microwave photon filter (MPF) has low-loss, high bandwidth, anti-electromagnetic interference (EMI), is easy to realize tunable and is easy to the features such as reconstruct, can significantly improve communication quality.Compared with conventional filter, microwave photon filter can be transferred to light territory the filtering of electric territory, thereby makes RoF system overcome electronic bottleneck.
Whether limited according to number of taps, microwave photon filter mainly contains the wave filter (document 1 based on finite impulse response system (FIR), Capmany J, Ortega B, Pastor D. " A Tutorial of microwave photonic filters " .Journal of Lightwave Technology, 2006; Document 2, Chaneh.W, Minasian.R.A. " Optical source coherence controller for fiber optic delay line RF/microwave signal processors " .Optics Communications, 2005; Document 3, Yu Yan and Jianping Yao. " A tunable photonic microwave filter with a complex coefficient using an optical RF phase shifer " .Photonics Technology Letters, 2007), with the wave filter (document 4 based on infinite impulse response system (IIR), Qiaofan Xu, David Fattal, and Raymond G.Beansoleil. " Silicon microring resonators with1.5 μ m radius " .Optics Express, 2011; Document 5, Zhu Wang, Kin Seng Chiang, and Qing Liu. " Microwave photonic filter based on circulating a cladding mode in a fiber ring resonator " .Optics Letters, 2010).Wherein, iir filter is with its features simple structure, and lower-price characteristic is deeply concerned.Iir filter is generally made up of two parts: coupling beam splitting unit and annular delay cell.Coupling beam splitting unit can provide beam splitting and coupling function, and the light part of input filter is introduced to delay cell, after postponing through delay cell additional cycle, is again coupled into coupling unit, enters next round beam splitting-delay-coupling cycle.This circulation is unlimited in theory, is therefore called unlimited response filter.Except simple fiber optic loop, iir filter can be divided into sagnac loop wave filter (document 6 according to the material of delay cell, Xudong Wang, Erwin H.W.Chan, and Robert A.Minasian. " Microwave photonic notch filter based on a dual-Sagnac-loop structure " .Applied Optics, 2010), silicon ring wave filter (document 7, Magdalena S.Nawrocka, Tao Liu, Xuan Wang, and Roberto R.Panepucci. " Tunable silicon microring resonator with wide free spectral range " .Applied Physics Letters, 2006), Mach Zehnder interferometry wave filter (document 8, Jos é Mora, Beatriz Ortega, Antonio Diez, Jos é Luis Cruz, Miguel V.Andr é s, Jos é Capmany, and Daniel Pastor, Journal of Lightwave Technology, 2006) microwave photon filter (document 9 with based on SOA, Weiqi Xue, Salvador Sales, Jesper
and Jos é Capmany. " Widely Tunable Microwave Photonic Notch Filter Based on Slow and Fast Light Effects " .Photonics Technology Letters, 2009).These wave filters respectively have its advantage, as restructural (document 7), relevant dispersion low (document 9) or can form single bandwidth frequency and respond (document 8), but all there is same shortcoming, be that delay cell is larger, be unfavorable for that device is microminiaturized and integrated.Its reason is just that delay cell material group index is on the low side.The computing formula of free spectral range (Free Spectral Range, FSR) is as follows: FSR=c/nL, and wherein c is light speed in a vacuum, and n is the group index of delay cell, and L is the length of delay cell.According to formula, to determine once meet the FSR of RoF system requirements, the length of delay cell will be inversely proportional to group index, therefore uses high group refraction materials to become the effective means that reduces delay cell length.As a kind of material that has slower rays characteristic, being introduced as of photonic crystal reduces filter size provides new scheme.
Due to photonic crystal, to have volume little, locality well and can realize the even characteristic such as Energy Transfer of zero loss of low-loss of turning round greatly, thereby there are huge advantage and potentiality at OEIC and PIC application, and there is research group aspect photonic crystal slower rays, obtaining great achievement both at home and abroad: the people such as Yun Shen in 2009 have realized the coupler waveguide slower rays device (document 10 of group index more than 100, Yun Shen, Guoping Wang.Multiple slow light bands in photonic crystal coupled resonator optical waveguides constructed with a portion of photonic quasicrystals.Physics Letters A, 2009), 2010, the people such as Fang Long by photonic crystal line waveguide slower rays device application in buffer unit (document 11, Fang Long, Huiping Tian, and Yuefeng Ji.Buffering capability and limitations in low dispersion photonic crystal waveguides with elliptical airholes.Optics, 2010).Wherein Slow Light in Photonic Crystal Waveguides structural design is flexible, can determine different group indexs by adjusting structural parameters, makes required precision than low many of high Q value coupler simultaneously, is the comparatively ideal scheme of making delay cell.
The present invention uses photonic crystal to make microwave photon filter first, is specially and utilizes curved waveguide that four port coupling beam dividers and slow optical wave guide lag line are integrated in same substrate.1550nm arrowband TE polarized light is injected to coupling mechanism, due to the coupled modes effect (document 12 of photonic crystal, CHIENFSS, HSU Y J.Dual wavelength demultiplexing by coupling and decoupling of photonic crystal waveguides.Optics Express, 2004), TE light is directly exported from outlet through coupling unit beam splitting rear portion, another part enters down going channel, and through curved waveguide input delay unit, after postponing, slow optical wave guide in delay cell re-enters coupling unit.So there is the characteristic of trap (band resistance) wave filter by the system spectrum response forming after infinite circulation.
Summary of the invention
The slower rays and the waveguide-coupled characteristic that the object of the invention is to utilize photonic crystal, significantly reduce the size of microwave photon filter, is more suitable for the microminiaturized trend in base station of current RoF system.
The present invention utilizes two 180 ° of U-shaped curved waveguides to be integrated on same flat board photon crystal coupled beam splitter and slow optical wave guide first, proposed a kind of photonic crystal that utilizes and made microwave photon filter, this wave filter can obtain by focused particle beam (FIB) technology segmentation etching on semiconductor material substrate.1550nm wave band arrowband TE polarized light will enter from entrance port coupling beam splitting W1 (removing the emptying pore of perfect photonic crystal one) waveguide, after waveguide beam splitting, part light output filter, another part is coupled into another W1 waveguide arranged side by side with incident waveguide.This part TE light enters along curved waveguide the delay cell that slow optical wave guide forms, and by the slower rays effect of slow optical wave guide, the group velocity of TE light slows down, thereby can in shorter light path, realize larger time delay.
The microwave photon filter of making in the present invention is made up of coupling beam divider and slow optical wave guide two parts, is connected between the two by two 180 ° of U-shaped curved waveguides.Wherein, two parallel W1 waveguides form four port coupling beam dividers, and the emptying pore in interval one between waveguide, carries out emulation by simulation software to its energy band diagram and transmission spectrum, obtains the coupling coefficient of coupling beam divider; By translation W1 waveguide both sides first row airport and change first, second emptying pore radius form slow optical wave guide, slower rays energy band diagram is carried out to emulation, process the group index curve that simulation result can obtain waveguide, thereby the group velocity that explanation 1550nmTE light is propagated in waveguide is slack-off.Article two, curved waveguide forms coupling part, and its field pattern and transmission spectrum are carried out to emulation, analyzes curved waveguide good at the transmission performance of 1550nm wave band from result, can realize the object that connects integrated device front and back module.Finally microwave photon filter entirety field pattern and transmission spectrum are carried out to emulation, the transmitting procedure by observation TE light in wave filter and the Frequency Response at delivery outlet, prove that wave filter has
fSR and notch depth more than 10dB, can be applied in 60GHz RoF system.
Object of the present invention can be achieved by the following measures:
Based on a microwave photon filter for photonic crystal, wherein:
This Photonic Crystal Microwave photon filter device is realized based on triangular crystal lattice Two-Dimensional Photonic Crystal Waveguide structure, and wherein Two-Dimensional Photonic Crystal Waveguide structure can be passed through FIB (focused ion beam: Focused Ion beam) or EBL (beamwriter lithography erosion: E-Beam Lithography) etching is made piecemeal.
The described integrated device that can realize microwave photon notch filter function is to be made up of coupling beam divider, curved waveguide structure and slow optical wave guide.In these devices, the width of waveguide is
a is the grating constant of triangular crystal lattice photonic crystal.Grating constant value a=350nm, airport radius r=123nm, refractive index n=3.4 of background material Si.
The design of described coupling beam divider structure can complete by adjusting coupling regime airport radius.Adjusting coupling regime airport radius can reduce coupling regime length in realizing 1550nm wave band light wave single mode transport, effectively reduces device size thereby carry.
Described slow optical wave guide is to obtain by translation W1 waveguide both sides first row airport the radius that changes first, second emptying pore.Wherein change the size of front two emptying pores and can make guided mode translation, be embodied in that first row radius is less, second row radius is larger, guided mode is translation more upwards, thereby realization is for the slower rays function of different frequency range light wave.Consider between slow optical wave guide and simple W1 waveguide and have pattern differentials, the present invention uses conical gradual change Structure Improvement pattern match.The effect of conical gradual change waveguide is the intermediate structure that between the slow optical wave guide larger at textural difference and W1 waveguide, insertion gradually changes, thereby light spread modes is changed gradually.Field pattern before and after using, can obviously observe the improvement of transmissison characteristic.
The design of described curved waveguide structure has designed by three aspects, that is: one is an airport of each increase at turning, two 60 ° of angles; The 2nd, three knees of waveguide are along the outside mobile special air of axis of symmetry direction hole site; The 3rd, the radius of change knee airport.
The present invention has the following advantages compared with classic method:
In the present invention, mentioned a kind of microwave photon filter based on photonic crystal is directly on a 2 D photon crystal flat board, to complete, by designing radius and the position of dull and stereotyped upper airport, can directly realize 1550nm wave band TE light notch filter function without splicing.
Compared with traditional microwave photon filter, the present invention has the advantages such as photonic crystal volume is little, loss is low, low in energy consumption, light field locality is good, especially volume little aspect, compare with fiber optic loop lag line with the silicon ring of general use, the group index of lag line of the present invention is much larger than silicon (3.4) or optical fiber (1.42).The filter delay line of the present invention design only has and produces 1/50 of the silicon ring of equal time delay or fiber optic loop length, has greatly reduced device volume.With similar photonic crystal integrated device (as document 13, L.Ferrier, P.Rojo Romeo, X.Letartre, E.Drouard and P.Viktorovitch, " 3D integration of photonic crystal devices:vertical coupling with a silicon waveguide " .Optics Express, 2010) compare, the present invention also has following several advantage: 1. in the coupling beam divider of the present invention's design, only change the radius in coupled waveguide region, the shape that does not change airport, has reduced manufacture difficulty; 2. the present invention, by changing radius and the position of the front two emptying pores in waveguide both sides, can make guided mode translation, thereby changes the working frequency range of device, has increased the dirigibility of device usable range; 3. coupling beam divider and the slower rays structure of the present invention's design have identical grating constant and material substrate, make it on same flat board, utilize the method direct etchings such as EBL, without splicing, are conducive to the application of device in PIC.
Principle of the present invention is as follows:
In the present invention, a kind of microwave photon filter based on photonic crystal is realized based on triangular crystal lattice Two-Dimensional Photonic Crystal Waveguide.It realizes principle: 1550nmTE light enters integrated device from entrance port Port1, due to the coupling between two W1 waveguides, after through waveguide-coupled effect, a TE light part is directly from outlet PoIrt3 output, and another part enters down going channel Port4.In order to utilize beam splitting TE light afterwards, after Port4, add curved waveguide structure, by adjusting the correlation parameter of curved waveguide, increase TE optical transmission rate.TE light enters slow optical wave guide by curved waveguide structure, significantly reduces, thereby realize very strong slow light effect because slower rays coupling makes the group velocity of transmission light.The exit of slow optical wave guide is added with the curved waveguide same with porch, by be reintroduced back to the Port2 mouth of coupling beam divider through the light of slower rays coupling, continues beam splitting.So, through unlimited circulation, finally reflect notch filter characteristic at the spectrogram of Light Out port.
Brief description of the drawings
The photonic crystal exclusive or logic gate structural parameters that following figure gets are all identical with embodiment.
Fig. 1 is a kind of microwave photon filter model schematic diagram based on photonic crystal, has wherein comprised three parts: photon crystal coupled beam splitter (PC-Coupler), photonic crystal lag line (PC-Delayline) and 180 ° of U-shaped curved waveguides.Light In is input port, and Light Out is delivery outlet.Photonic crystal is silica-based two-dimentional triangular crystal lattice airport structure, grating constant a=350nm, normal air pore radius r=0.35a, the refractive index n of medium silicon
si=3.4.
Fig. 2 is the structural model schematic diagram of photon crystal coupled beam splitter, has wherein comprised two W1 waveguides, and duct width is
the emptying pore in interval one between two waveguides.The radius r r=0.30a of the red airport of coupling regime.Port1 is entrance port, and TE light is exported along Port3 through a beam splitting part, and another part enters curved waveguide by Port4.
The upper figure of Fig. 3 is the energy band diagram in TE optically-coupled beam splitter while utilizing the rr=0.30a that plane wave expansion method obtains, and figure below is the output port transmission spectrum that utilizes FDTD algorithm to obtain.
Fig. 4 is slow optical wave guide structural representation, as shown in the figure, slow optical wave guide be by W1 waveguide both sides first row airport to right translation Δ x=0.1a, move Δ y=0.17a to lining in waveguide; First row airport radius is reduced to r1=0.8r, and second row airport is increased to r2=1.1r.
Fig. 5 is the group index n of TE light in slow optical wave guide
gcurve map, the wavelength that horizontal ordinate is resonance frequency, curve represents the group index n that different wave length is corresponding
g.
Fig. 6 is 180 ° of curved waveguide structural representations, and the little figure in left side is the enlarged drawing of 60 ° of curved waveguides.In order to increase TE optical transmission rate, respectively in two turning points of 60 ° of curved waveguides increase an airport, and by 2 blue airports in vertical and horizontal direction along the each mobile 0.15a of the direction of arrow, the radius r x=0.36a of blue airport.Red airport radius is changed into ry=0.38a, and to translation 0.1a outside waveguide.
Fig. 7 is the field pattern of curved waveguide.
Fig. 8 is the schematic diagram of slow optical wave guide taper coupled structure.Painted airport left side is common W1 waveguide, and right side is slow optical wave guide, and painted areas airport characteristic is gradually varied to slow optical wave guide according to linear rule by common waveguide.Be embodied in: the radius of every two adjacent red airports successively decreases with difference 0.03a/5 from left to right, simultaneously by red airport along waveguide level to the right with vertical downward direction translation, adjacent vacant pore translation spacing is respectively Δ x/5 and Δ y/5; The radius of blue airport increases progressively according to difference 0.03a/5 from left to right.
Fig. 9 is the TE light field figure that slow optical wave guide adds taper coupled structure front and back, and upper figure is the field pattern that does not add pyramidal structure, contrasts up and down known taper coupled structure and can significantly improve coupling efficiency, reduces modal dispersion.
Figure 10 is the transmission spectrum that microwave photon filter is measured at Light Out place, and red dotted line is the transmission spectrum that FDTD calculates, and blue curve is the transmission spectrum that utilizes formula to draw.
Figure 11 is the field pattern of microwave photon filter different time.
Figure 12 is the schematic diagram that microwave photon filter (MPF) is applied in 60GHz radio over fibre system, and the double-sideband signal being produced by modulator is through having generated single sideband singal after MPF filtering.
Embodiment
Microwave photon filter construction based on photonic crystal as shown in Figure 1.The silica-based two-dimentional triangular crystal lattice airport structure that this structure is used, grating constant a=350nm, normal air pore radius r=0.35a, the refractive index n of medium silicon
si=3.4.Wherein comprise two major parts: coupling beam divider (PC Coupler) and slow optical wave guide lag line (PC Delay-line), and connect this two-part 180 ° of U-shaped curved waveguides.1550nm TE mould narrow band light is from the input of Light In mouth, and through the filter action of narrow band filter, from the output of Light Out mouth, transmission spectrum shows
the spectral characteristic of notch depth 10dB.
Fig. 2 is the structural model schematic diagram of photon crystal coupled beam splitter, has wherein comprised two W1 waveguides, and duct width is
the emptying pore in interval one between two waveguides, the radius r r=0.30a of interval airport.TE light is inputted from Port1, and a part is from Port3 output, and another part is exported from Port4 because of waveguide-coupled principle, and enters slow optical wave guide lag line through U-shaped curved waveguide, after the delay that the elapsed time is T, reenters coupling beam divider along Port2 mouth.The light intensity of four ports of coupling beam divider meets following formula:
Wherein E
irepresent the field intensity of Port i port; R represents that TE light is by the energy loss of a coupling beam divider; K is the coupling constant of coupling beam divider, and physical significance is the light intensity that enters another W1 waveguide by coupling beam divider along the TE light of W1 waveguide input and accounts for the ratio of all output intensities; δ represents the loss that curved waveguide and slower rays lag line cause; β is the propagation constant of light wave in slow optical wave guide, can pass through β=2 π fn
g/ c calculates, and f is the frequency of radiofrequency signal, n
gbe slow optical wave guide group index, c is the speed of light in vacuum; L is the length of slow optical wave guide.Can obtain the transmissison characteristic of microwave photon filter according to formula 1-3, that is:
Therefore in order to understand the transmissison characteristic of microwave photon filter, we only need to determine r, k, δ, n
g, five parameters of L.
First determine parameter r and k by adjusting coupling beam divider structure, as the radius that reduces airport between two row W1 waveguides increases stiffness of coupling, thereby reduce loss.Through repeatedly debugging, the length of beam splitter is defined as 34a by the present invention, and waveguide intermediate air pore radius is defined as 0.30a.Fig. 3 is the measurement result of coupling beam divider: upper figure is the energy band diagram of coupling beam divider, the corresponding input wavelength 1550nm of normalized frequency 0.226, as can be seen from the figure in 0.226 frequency range waveguide, there are two guided modes, these two guided modes exist wave vector poor, and the existence poor just because of wave vector just produces waveguide-coupled effect; Figure below is the transmission spectrum of Port3 and Port4, and as can be seen from the figure Port3 is that 0.564, Port4 is 0.346 in the transmissivity at 1550nm place.Therefore the loss r=1-(0.564+0.346)=0.09 of coupling beam divider, k=0.346/ (0.564+0.346)=0.38.
Next determine the group index of TE light in slow optical wave guide lag line.As shown in Figure 4, the correlation parameter of adjusting waveguide both sides airport can significantly increase slower rays efficiency, thereby reduces device size.Parameter adjustment is embodied in: both sides first row airport radius is reduced to 80% of normal air pore radius, i.e. 0.28a, simultaneously to right translation 0.1a, to 10% of translation duct width inside waveguide, i.e. 0.14a; Both sides second row airport radius is increased to 1.1 times of normal air pore radius, i.e. 0.385a.Group index after adjusting and wavelength relationship figure as shown in Figure 5, adjust as can be drawn from Figure 5 slow optical wave guide parameter and can significantly improve group index, the group index n finally obtaining
g=111.The notch filter of making due to the present invention need to be applied to the unnecessary sideband of filtering in 60GHz RoF system, and therefore to should be double-side band frequency range slightly wide for the free spectral range FSR of wave filter, and FSR is defined as 130GHz by the present invention.According to FSR=c/n
gl and grating constant, the length L of slow optical wave guide lag line is defined as 59a.
Then by 180 ° of U-shaped curved waveguide butt coupling beam splitters and slow optical wave guide lag line.The structure of curved waveguide as shown in Figure 6, in order to increase TE optical transmission rate, respectively in two turning points of 60 ° of curved waveguides increase an airport, and by 2 blue airports in vertical and horizontal direction along the each mobile 0.15a of the direction of arrow, the radius r x=0.36a of blue airport.Red airport radius is changed into ry=0.38a, and to translation 0.1a outside waveguide.Utilize FDTD algorithm to carry out emulation to curved waveguide, TE light transmits well in curved waveguide as can be seen from Figure 7.Because 1550nmTE light is in the edge of slow optical wave guide cutoff frequency, between slow optical wave guide and common W1 waveguide, there is pattern mismatch problem simultaneously.Therefore need to improve in waveguide both sides increase pyramidal structure the transmissison characteristic of waveguide.As shown in Figure 8, painted airport left side is common W1 waveguide to pyramidal structure, and right side is slow optical wave guide, and painted areas airport characteristic is gradually varied to slow optical wave guide according to linear rule by common waveguide.Be embodied in: the semidiameter of every two adjacent red airports is 0.03a/5 from left to right, simultaneously by red airport along the translation of waveguide horizontal and vertical direction, adjacent vacant pore translation spacing is respectively Δ x/5 and Δ y/5; The radius of blue airport successively decreases according to difference 0.03a/5 from left to right.Utilize equally FDTD algorithm simulating, simulation result as shown in Figure 9: upper figure is the field pattern that does not add tapered transmission line, can see that 1550nmTE light local is difficult to introduce common waveguide in slow optical wave guide; Figure below is to increase tapered transmission line field pattern afterwards, and transmissison characteristic is significantly improved as we can see from the figure.
Finally the overall permanence of microwave filter is analyzed.As shown in figure 10, red curve is the transmission spectrum that FDTD calculates, blue curve is the transmission spectrum that utilizes formula to draw, red curve and blue curve represent respectively that FDTD calculates and the spectral characteristic output terminal Light Out that utilizes formula to draw, mutually coincide between the two, show FSR=130GHz, more than notch depth 10dB trap characteristic.When input light source is the 1550nmTE light time, the electric field space distribution plan of different time as shown in figure 11.This wave filter is adapted at 60GHz RoF system and uses, and as shown in figure 12, wave filter can the unnecessary sideband of filtering.
In sum, the present invention has designed a kind of microwave photon filter based on photonic crystal.The present invention on a photonic crystal, utilize 180 ° of U-shaped curved waveguides integrated coupling beam divider and slow optical wave guide lag line, be formed on 1550nm wave band FSR=130GHz, notch filter more than notch depth 10dB can obtain good application in following 60GHz radio over fibre system.
Claims (4)
1. the microwave photon filter based on photonic crystal, wherein: this microwave photon filter is made up of the coupling beam divider on same substrate and slow optical wave guide lag line two parts, and two parts are connected by 180 ° of U-shaped curved waveguides, wave filter place substrate is triangular crystal lattice airport structure, it is airport silicon medium background, wherein the refractive index of silicon is 3.4, grating constant a=350nm, normal air pore radius r=0.35a.
2. microwave photon filter according to claim 1, it is characterized in that the specific design method of photonic crystal slow optical wave guide lag line, in this programme, first form W1 waveguide by pumping perfect photonic crystal one air-discharging hole, then regulate radius and the position of first, second emptying pore of W1 waveguide both sides to form slow optical wave guide, the group index of slow optical wave guide reaches 111.
3. microwave photon filter according to claim 1, it is characterized in that the specific design method of 80 ° of U-shaped curved waveguides of photon crystal 1, curved waveguide in this programme is quantity, radius size and the position by changing knee airport, thereby realizes the transmission of 1550nm TE light.
4. microwave photon filter according to claim 1, is characterized in that the free spectral range of wave filter is designed to 130GHz, and notch depth, more than 10dB, can be applicable to the unnecessary sideband of 60GHz radio over fibre system filtering.
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| RU2658113C1 (en) * | 2017-07-10 | 2018-06-19 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Саратовский национальный исследовательский государственный университет имени Н.Г. Чернышевского" | Microwave photonic crystal |
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| CN115061236B (en) * | 2022-03-24 | 2023-10-20 | 北京交通大学 | Controllable silicon-based integrated optical buffer of reading and writing of Sagnac coupling micro-ring array structure |
| CN115291324B (en) * | 2022-07-08 | 2023-05-26 | 中国地质大学（武汉） | Silicon-based all-optical diode |
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