CN104007565A - Silicon substrate track angular momentum state converter - Google Patents
Silicon substrate track angular momentum state converter Download PDFInfo
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- CN104007565A CN104007565A CN201410187956.7A CN201410187956A CN104007565A CN 104007565 A CN104007565 A CN 104007565A CN 201410187956 A CN201410187956 A CN 201410187956A CN 104007565 A CN104007565 A CN 104007565A
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- angular momentum
- planet phasing
- momentum state
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Abstract
The invention discloses a silicon substrate track angular momentum state converter and relates to the field of optical communication integrated devices. The silicon substrate track angular momentum state converter comprises an input annular coupling raster, a sampling waveguide array, a phase tuning electrode array and a light output device. The input annular coupling raster is connected with the light output device through the sampling waveguide array which is evenly distributed along a circumference. The sampling waveguide array is made of silicon substrate materials. Each waveguide of the sampling waveguide array is provided with a phase tuning electrode. All the phase tuning electrodes form the phase tuning electrode array. Converting of the signal track angular momentum states can be achieved, the device manufacturing technology is compatible with a CMOS technology, large-scale production can be achieved, and cost is lowered.
Description
Technical field
The present invention relates to optical communication integrated device field, specifically relate to a kind of silica-based orbit angular momentum state converter.
Background technology
With the progressively lifting of person's message capacity demand, optical communication system is to higher rate, spectral efficient, high photon density development, the light signal transmitting in unit path is more and more, multi-level modulation, wavelength-division multiplex, space division multiplexing, mould divide that multiplexing etc. technology is corresponding is applied, the dimension that orbital angular momentum provides a kind of new optical multiplexed signal to use, started to be paid attention in recent years.
Orbital angular momentum light beam on the cross section of transmission direction, phase place
change with angular coordinate:
wherein: exp is exponential function, and i represents imaginary part, θ is angular coordinate, and l is that angular coordinate turns around, and phase place changes the number of times of 2 π, is called orbit angular momentum state, between different orbit angular momentum states, is orthogonal, can multiplexing transmission.Adopt spatial light modulator, the PHASE DISTRIBUTION on beam cross section is modulated, realize orbital angular momentum light beam.Spatial light modulator has LCoS (Liquid Crystal on Silicon, liquid crystal on silicon) two kinds of scheme and silica-based Integrated Solutions, conversion between angular momentum state is to adopt liquid crystal on silicon scheme at present, liquid crystal on silicon scheme needs LCD space light modulator, size is large, cannot with the large-scale integrated such as modulator, detector; At present, silica-based Integrated Solution cannot be realized the conversion between signal track angular momentum state.
Summary of the invention
The object of the invention is the deficiency in order to overcome above-mentioned background technology, a kind of silica-based orbit angular momentum state converter is provided, can realizes the conversion between signal track angular momentum state, the manufacture craft of device and CMOS process compatible, can produce on a large scale, reduce costs.
The invention provides a kind of silica-based orbit angular momentum state converter, comprise the annular coupling grating of input and light output device, also comprise sampling waveguide array and planet phasing electrod-array, the annular coupling grating of described input is connected with light output device by the sampling waveguide array distributing along even circumferential, sampling waveguide array adopts silica-base material to make, in each waveguide of sampling waveguide array, be provided with a planet phasing electrode, all planet phasing electrodes form planet phasing electrod-array jointly.
On the basis of technique scheme, described planet phasing electrod-array to the planet phasing mode of sampling waveguide array is: above sampling waveguide array, make heating resistor array, on-load voltage or electric current on electrod-array, change the temperature of heating resistor array, thereby change the temperature of sampling waveguide array, realize the planet phasing to sampling waveguide array.
On the basis of technique scheme, between any waveguide in described sampling waveguide array, be 2n π for the phase differential of input wavelength, wherein n is integer.
On the basis of technique scheme, described light output device is the annular coupling grating of output.
On the basis of technique scheme, the angular momentum state of the light beam of the annular coupling grating of described input is l, l is integer, in sampling waveguide array, there is m root sampling waveguide, the planet phasing electrod-array of answering in contrast also has m planet phasing electrode, wherein adjacent planet phasing electrode increases by 2 π k/m along clockwise direction successively, and wherein k is integer, and the orbit angular momentum state of exporting the light beam of outgoing in annular coupling grating is l+k.
On the basis of technique scheme, described light output device is made up of Rowland circle and output port.
On the basis of technique scheme, in described sampling waveguide array, there is m ' root sampling waveguide, the planet phasing electrod-array of answering in contrast also has the individual planet phasing electrode of m ', total 2p+1 port on output port, port numbers is along be followed successively by clockwise-p,-p+1,-1, 0, 1, p-1, p, the orbit angular momentum state of inputting light beam on annular coupling grating is l ', m ', p, l ' is positive integer, and m ' > p, l' ∈ [p, p], on planet phasing electrod-array during without electric signal, incide optical diffraction in the Rowland circle l ' port to output port via sampling waveguide array, when planet phasing electrode adjacent in planet phasing electrod-array increases by 2 π k'/m' along clockwise direction successively, wherein k ' is integer, and (l'+k') ∈ [p, p], inputting the annular coupling grating angular momentum state that gets on the right track is that the optical diffraction of l ' is to the l'+k' port of output port.
Compared with prior art, advantage of the present invention is as follows:
(1) silica-based integrated device of the present invention can be realized the conversion between signal track angular momentum state, as the angular momentum state from l=1 is converted into l=2, compared with liquid crystal on silicon scheme, silica-based Integrated Solution has that size is little, manufacture craft and CMOS (Complementary Metal Oxide Semiconductor, complementary metal oxide semiconductor (CMOS)) process compatible, can large-scale production, the advantage such as reduce costs, have good application prospect.
(2) element manufacturing of the present invention, can be integrated with light source, modulator, circuit etc. more easily on silicon based photon platform.
Brief description of the drawings
Fig. 1 is the structural representation of silica-based orbit angular momentum state converter in embodiment 1.
Fig. 2 is the structural representation of silica-based orbit angular momentum state converter in embodiment 2.
Fig. 3 utilizes planet phasing electrod-array to carry out planet phasing schematic diagram to sampling waveguide array.
Reference numeral: 1-inputs annular coupling grating, and 2-exports annular coupling grating, and 3-samples waveguide array, 4-planet phasing electrod-array, 5-Rowland circle, 6-output port, 7-electrod-array, 8-heating resistor array.
Embodiment
Below in conjunction with drawings and the specific embodiments, the present invention is described in further detail.
Shown in Fig. 1, Fig. 2, the embodiment of the present invention provides a kind of silica-based orbit angular momentum state converter, comprise the annular coupling grating 1 of input, sampling waveguide array 3, planet phasing electrod-array 4 and light output device, inputting annular coupling grating 1 is connected with light output device by the sampling waveguide array 3 distributing along even circumferential, sampling waveguide array 3 adopts silica-base material to make, the temperature coefficient of its refractive index is high, in each waveguide of sampling waveguide array 3, be provided with a planet phasing electrode, all planet phasing electrodes form planet phasing electrod-array 4 jointly.Shown in Fig. 1, Fig. 2, light output device can be the annular coupling grating 2 of output, also can be made up of Rowland circle 5 and output port 6.
Shown in Figure 3, planet phasing electrod-array 4 to the planet phasing mode of sampling waveguide array 3 is: above sampling waveguide array 3, make heating resistor array 8, on-load voltage or electric current on electrod-array 7, change the temperature of heating resistor array 8, thereby change the temperature of sampling waveguide array 3, realize the planet phasing to sampling waveguide array 3.Between any waveguide in sampling waveguide array 3, be 2n π for the phase differential of input wavelength, wherein n is integer.
Be elaborated below by 2 specific embodiments.
Embodiment 1
Shown in Figure 1, silica-based orbit angular momentum state converter in embodiment 1 by input annular coupling grating 1, sampling waveguide array 3, export annular coupling grating 2, planet phasing electrod-array 4 forms, inputting annular coupling grating 1 is connected with the annular coupling grating 2 of output by the sampling waveguide array 3 distributing along even circumferential, in each waveguide of sampling waveguide array 3, be provided with a planet phasing electrode, all planet phasing electrodes form planet phasing electrod-array 4 jointly.Between any waveguide in sampling waveguide array 3, be 2n π for the phase differential of input wavelength, wherein n is integer.
Shown in Figure 1, the angular momentum state of supposing the light beam of the annular coupling grating 1 of input is l, l is integer, in sampling waveguide array 3, there is m root sampling waveguide, the planet phasing electrod-array 4 of answering in contrast also has m planet phasing electrode, wherein adjacent planet phasing electrode increases by 2 π k/m along clockwise direction successively, and wherein k is integer, and the orbit angular momentum state of exporting the light beam of outgoing in annular coupling grating 2 is l+k.
For example: the orbit angular momentum state of supposing light beam is 1, impinge perpendicularly on the annular coupling grating 1 of input, 16 sample the equal in length of waveguides, composition sampling waveguide array 3, planet phasing electrode adjacent in planet phasing electrod-array 4 increases π/4 along clockwise direction successively, and from export annular coupling grating 2, the light beam orbit angular momentum state of outgoing is 3.
Embodiment 2
Shown in Figure 2, silica-based orbit angular momentum state converter in embodiment 2 forms by inputting annular coupling grating 1, sampling waveguide array 3, planet phasing electrod-array 4, Rowland circle 5, output port 6, inputting annular coupling grating 1 is connected with Rowland circle 5 by the sampling waveguide array 3 distributing along even circumferential, sampling waveguide array 3 incides optical diffraction in Rowland circle 5 to output port 6, in each waveguide of sampling waveguide array 3, be provided with a planet phasing electrode, all planet phasing electrodes form planet phasing electrod-array 4 jointly.Between any waveguide in sampling waveguide array 3, be 2n π for the phase differential of input wavelength, wherein n is integer.
Shown in Figure 2, supposing has m ' root to sample waveguide in sampling waveguide array 3, the planet phasing electrod-array 4 of answering in contrast also has the individual planet phasing electrode of m ', total 2p+1 port on output port 6, port numbers is along be followed successively by clockwise-p,-p+1,-1, 0, 1, p-1, p, the orbit angular momentum state of inputting light beam on annular coupling grating 1 is l ', m ', p, l ' is positive integer, and m ' > p, l' ∈ [p, p], on planet phasing electrod-array 4 during without electric signal, incide optical diffraction in the Rowland circle 5 l ' port to output port 6 via sampling waveguide array 3.When planet phasing electrode adjacent in planet phasing electrod-array 4 increases by 2 π k'/m' along clockwise direction successively, wherein k ' is integer, and (l'+k') ∈ [p, p], inputting annular coupling grating 1 angular momentum state that gets on the right track is that the optical diffraction of l ' is to the l'+k' port of output port 6.
For example: the orbit angular momentum state of supposing light beam is 1, impinge perpendicularly on the annular coupling grating 1 of input, 16 sample the equal in length of waveguides, composition sampling waveguide array 3, in the time not loading electric signal on planet phasing electrod-array 4, light beam is diffracted into No. 1 port outgoing of output port 6 through sampling waveguide array 3 and Rowland circle 5.When planet phasing electrode adjacent in planet phasing electrod-array 4 increases π/4 along clockwise direction successively, beam diffraction is to No. 3 port outgoing of output port.
Those skilled in the art can carry out various modifications and variations to the embodiment of the present invention, if these amendment and modification within the scope of the claims in the present invention and equivalent technologies thereof, these revise and modification also within protection scope of the present invention.
The prior art that the content of not describing in detail in instructions is known to the skilled person.
Claims (7)
1. a silica-based orbit angular momentum state converter, comprise the annular coupling grating of input (1) and light output device, it is characterized in that: also comprise sampling waveguide array (3) and planet phasing electrod-array (4), the annular coupling grating of described input (1) is connected with light output device by the sampling waveguide array (3) distributing along even circumferential, sampling waveguide array (3) adopts silica-base material to make, in each waveguide of sampling waveguide array (3), be provided with a planet phasing electrode, all planet phasing electrodes form planet phasing electrod-array (4) jointly.
2. silica-based orbit angular momentum state converter as claimed in claim 1, it is characterized in that: described planet phasing electrod-array (4) to the planet phasing mode of sampling waveguide array (3) is: the top at sampling waveguide array (3) makes heating resistor array (8), at the upper on-load voltage of electrod-array (7) or electric current, change the temperature of heating resistor array (8), thereby change the temperature of sampling waveguide array (3), realize the planet phasing to sampling waveguide array (3).
3. silica-based orbit angular momentum state converter as claimed in claim 2, is characterized in that: between any waveguide in described sampling waveguide array (3), be 2n π for the phase differential of input wavelength, wherein n is integer.
4. silica-based orbit angular momentum state converter as claimed in claim 3, is characterized in that: described light output device is the annular coupling grating of output (2).
5. silica-based orbit angular momentum state converter as claimed in claim 4, it is characterized in that: the angular momentum state of the light beam of the annular coupling grating of described input (1) is l, l is integer, in sampling waveguide array (3), there is m root sampling waveguide, the planet phasing electrod-array (4) of answering in contrast also has m planet phasing electrode, wherein adjacent planet phasing electrode increases by 2 π k/m along clockwise direction successively, wherein k is integer, and the orbit angular momentum state of exporting the light beam of outgoing in annular coupling grating (2) is l+k.
6. silica-based orbit angular momentum state converter as claimed in claim 3, is characterized in that: described light output device is made up of Rowland circle (5) and output port (6).
7. silica-based orbit angular momentum state converter as claimed in claim 6, it is characterized in that: in described sampling waveguide array (3), have m ' root sampling waveguide, the planet phasing electrod-array (4) of answering in contrast also has the individual planet phasing electrode of m ', upper total 2p+1 the port of output port (6), port numbers is along be followed successively by clockwise-p,-p+1,-1, 0, 1, p-1, p, the orbit angular momentum state of inputting the upper light beam of annular coupling grating (1) is l ', m ', p, l ' is positive integer, and m ' > p, l' ∈ [p, p], when planet phasing electrod-array (4) is gone up without electric signal, incide optical diffraction in Rowland circle (5) l ' port to output port (6) via sampling waveguide array (3), when planet phasing electrode adjacent in planet phasing electrod-array (4) increases by 2 π k'/m' along clockwise direction successively, wherein k ' is integer, and (l'+k') ∈ [p, p], inputting annular coupling grating (1) angular momentum state that gets on the right track is that the optical diffraction of l ' is to the l'+k' port of output port (6).
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| CN201410187956.7A CN104007565B (en) | 2014-05-06 | 2014-05-06 | Silica-based orbit angular momentum state converter |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112415651A (en) * | 2020-12-15 | 2021-02-26 | 清华大学 | Design and preparation method and system for radiation focusing of optical chip |
Citations (3)
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| CN102646927A (en) * | 2012-04-11 | 2012-08-22 | 四川马尔斯科技有限责任公司 | Wavelength-tunable external cavity laser based on waveguide reflecting grating array |
| WO2013160902A1 (en) * | 2012-04-25 | 2013-10-31 | Yissum Research Development Company Of The Hebrew University Of Jerusalem Ltd. | System and method for mode division multiplexing |
| CN103487956A (en) * | 2013-09-17 | 2014-01-01 | 武汉邮电科学研究院 | Light beam orbital angular momentum generating device |
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2014
- 2014-05-06 CN CN201410187956.7A patent/CN104007565B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102646927A (en) * | 2012-04-11 | 2012-08-22 | 四川马尔斯科技有限责任公司 | Wavelength-tunable external cavity laser based on waveguide reflecting grating array |
| WO2013160902A1 (en) * | 2012-04-25 | 2013-10-31 | Yissum Research Development Company Of The Hebrew University Of Jerusalem Ltd. | System and method for mode division multiplexing |
| CN103487956A (en) * | 2013-09-17 | 2014-01-01 | 武汉邮电科学研究院 | Light beam orbital angular momentum generating device |
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| HUAXING XU AND LI YANG: "Conversion of orbital angular momentum of light in chiral fiber gratings", 《OPTICS LETTERS》 * |
| SHU-CHUN CHU等: "Generation of doughnutlike vortex beam with tunable orbital angular momentum from lasers with controlled Hermite–Gaussian modes", 《APPLIED OPTICS》 * |
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Cited By (1)
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| CN112415651A (en) * | 2020-12-15 | 2021-02-26 | 清华大学 | Design and preparation method and system for radiation focusing of optical chip |
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Address after: 430074, No. 88, postal academy road, Hongshan District, Hubei, Wuhan Patentee after: Wuhan post and Telecommunications Science Research Institute Co., Ltd. Address before: 430074, No. 88, postal academy road, Hongshan District, Hubei, Wuhan Patentee before: Wuhan Inst. of Post & Telecom Science |