CN101840029B - Integrated reconfigurable optical add-drop multiplexer - Google Patents
Integrated reconfigurable optical add-drop multiplexer Download PDFInfo
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- CN101840029B CN101840029B CN2010101623232A CN201010162323A CN101840029B CN 101840029 B CN101840029 B CN 101840029B CN 2010101623232 A CN2010101623232 A CN 2010101623232A CN 201010162323 A CN201010162323 A CN 201010162323A CN 101840029 B CN101840029 B CN 101840029B
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Abstract
The invention discloses an integrated reconfigurable optical add-drop multiplexer. A reconfigurable optical add-drop multiplexer unit adopts a cascade adjustable double microring resonator as a basic unit and comprises a plurality of cascade adjustable double microring resonators, wherein each cascade adjustable double microring resonator comprises two straight waveguides which are not crossed and two disc waveguides with different radiuses; the two disc waveguides are positioned between the two straight waveguides and keep preset coupling distances with the two straight waveguides; and a preset coupling distance is also kept between the two disc waveguides. In the invention, mature process techniques are used, so the element has a compact structure and has high expandability and stability; a method of cascading double rings with different radiuses is used to expand a free spectrum range (FSR), so the number of channels is increased and the information throughput of the element is increased; the stability of the element is improved by using the filter characteristic of a double ring flat top; the resonance wavelength can be adjusted dynamically by using the thermo-optic effect to adjust microrings; and thus, the reconfigurable optical add-drop multiplexer if formed.
Description
Technical field
The present invention relates to a kind of integrated reconfigurable optical add-drop multiplexer (Reconfigurable OpticalAdd/Drop Multiplexer; ROADM); Especially, this reconfigurable optical add-drop multiplexer is through realizing at a bigger less adjustable micro-ring resonator (MRR) of the two-dimentional on every side a series of radiuses of arranging of adjustable micro-ring resonator (MRR) of radius.
Background technology
It is the information age of core with the network that 21 century is one, and along with rapid development of science and technology, the transinformation explosion type of communication field increases progressively, and common electric signal network has been difficult to satisfy increasing sharply of transinformation.The optical information transmission network is that the development of information age provides strong technical support as the basic network of information transmission, receives scientific research personnel's extensive concern in recent years, and has obtained significant progress, for very big contribution has been made in the scientific-technical progress of society.Optical-fiber network is to provide on the basis of high capacity, long distance, highly reliable transmission medium at optical fiber, utilizes the interconnected and flexible dispatching of photon and electron controls technology realization multinode network.Optical-fiber network has big bandwidth, high capacity, characteristics such as highly reliable.The bandwidth of an optical fiber potentiality have further been excavated in the appearance of wavelength-division multiplex (WDM) technology, have increased the transmission capacity of optical fiber greatly, and this provides strong guarantee for the networking of photosphere, has promoted the transmission capacity of optical-fiber network rapidly.
The Optical Transmission Network OTN (OTN) that ITU-T proposes is realized networking through optical cross-connection equipment (OXC) and Optical Add/Drop Multiplexer (OADM), the optical-fiber network that formation has high degree of flexibility, the transparency and survivability with wavelength granularity in return.Especially since the nineties in last century; Along with developing rapidly of Fibre Optical Communication Technology, many scholars have proposed the notion of " all-optical network ", and promptly signal passes whole network with the form of light; Directly in the light territory, carry out transmission, regeneration and the exchange of signal; The dreamboat of arbitrary format signal to reach the transparency of full light transmission, is realized at any time, anywhere, transmitted in the centre without any opto-electronic conversion.All-Optical Communication Network based on wavelength-division multiplex can make communication network possess stronger manageability, dirigibility and the transparency.
The new type light networks development has proposed the requirement of upgrading to optoelectronic device.At first, common carrier is when promoting the optical-fiber network capacity, with the dirigibility of paying close attention to optical-fiber network more, stability and extensibility, to cut operating costs and to tackle fast-changing market environment.On device level, development tunable devices, multi-functional integrated light shutter device and the monitoring device of network performance will be the foundation stones that makes up ASON.Optical add-drop multiplexer (OADM) is as the nucleus equipment of all-optical network and more and more receive people's attention.
Developing rapidly of optical-fiber network also had higher requirement to traditional optical add-drop multiplexer (OADM):
1) optical-fiber network develops towards the direction of dirigibility and extensibility, thereby requires optical add-drop multiplexer not only can have the wavelength dynamic restructuring, and can utilize software that network is carried out Long-distance Control to support the requirement of Wavelength reservation and network recovery.Obviously; Traditional optical add-drop multiplexer (OADM) can't satisfy the function of wavelength dynamic restructuring, promptly is difficult to satisfy the requirement of network development, and reconfigurable optical add-drop multiplexer (ROADM) can other exchange of wavelength level between road up and down of accomplishing optical channel on the node and optical channel; And through the ROADM subsystem of software in can remote control network; Thereby realize the configuration and the adjustment of road wavelength up and down, make network have dynamic restructuring and self-healing function, if adopt module with wavelength conversion ability; Can also realize the open network structure, make network have wavelength compatibility and service transparency.
2) optical-fiber network develops towards high speed, high capacity direction, thereby the requirement of optical add-drop multiplexer transmission capacity is also improved greatly.The method that generalized case increases the ROADM transmission capacity has two kinds: a can increase the transmission capacity of ROADM through the capacity that increases individual channel for the fixing number of channel; B can increase the transmission capacity of ROADM through increasing the number of channel for fixing channel capacity.We mainly take second method promptly to increase the transmission capacity that the number of channel increases ROADM.For a specific system, channel spacing is certain according to the regulation of International Telecommunication Union, the communication system of 100GHZ for example, and channel spacing is 0.8nm.For for the ROADM of micro-ring resonator; The free general scope (FSR) of little ring must cover whole range of channels; So for for the ROADM of micro-ring resonator, improve free general scope (FSR) that transmission capacity can be through increasing little ring thus the increase number of channel realizes.This shows that the free general scope (FSR) of taking certain measure to expand little ring seems particularly important.This programme adopts the way of cascade radius different bicyclic to expand free general scope (FSR).
3) optical-fiber network towards on a large scale, at a high speed, the development of high capacity direction, the reliability of communication system is had higher requirement.For for the ROADM of micro-ring resonator, the filtering characteristic of the long-range navigation thatch type of monocycle is difficult to satisfy the requirement of reliability of communication system, and for example: the resonance wavelength of supposing little ring is λ
0And the wavelength of real work and λ
0Have a very little deviation, the wavelength of real work just can accurately not carry up and down like this, so the filtering characteristic of the long-range navigation thatch type of monocycle just is difficult to satisfy the requirement of system reliability.Because very little wave length shift just causes the mistake of data transmission probably.This shows that for high stability communication system, the filtering characteristic of the flat-head type that the cascade dicyclo is unique has very big advantage.It can allow wave length shift among a small circle.This programme is exactly the stability that the unique flat-top filtering characteristic of employing cascade dicyclo improves communication system.
The material aspect: silicon-on-insulator (SOI) technology is a silicon integrated circuit technology; Because its technology is simple relatively, characteristics such as reliability is high, and cost is cheap relatively; In microelectronic industry, extensively adopted, developed into comparatively ripe microelectronic process engineering at present.Therefore, for compatible with silicon microelectronics, silicon based photon is learned also with SOI as main research platform.Silicon nanowires waveguiding structure based on the SOI technology becomes silica-based integrated optics hot research fields in recent years.The compact conformation of silicon nanowires waveguide, sectional dimension is hundred nanometer scale, and bending radius can be as small as micron dimension, and this has reduced the area of device greatly.Improvement along with technology and structure; The loss of nano wire waveguide constantly reduces, and though the report of at present lossy nano wire waveguide less than 3dB/cm is should value relatively large; But the device area that is based on the nano wire waveguide is very little, so the loss of device integral body and little.Have characteristics such as functional, compact conformation and functional configuration be flexible based on the micro-ring resonator structure of silicon nanowires waveguide.
The reconfigurable optical add-drop multiplexer that the present invention proposes uses the micro-ring resonator structure based on the silica-based nanowire waveguide to realize.
Summary of the invention
The technical matters that (one) will solve
Fundamental purpose of the present invention is to provide a kind of integrated reconfigurable optical add-drop multiplexer; Integrated level is high; Extensibility is strong, and is convenient to electricity component integratedly, can utilize software that network is carried out Long-distance Control; Make network have dynamic restructuring and self-healing function; Utilize cascade radius different bicyclic the filter construction broadening wave filter free general scope (FSR) thus can increase the number of channel of ROADM, increased the transmission capacity of optical add-drop multiplexer greatly and can realize the filtering characteristic of top flat type, improved stability of network.The entire device structure waveguide do not occur and intersects; Thereby avoided the loss and the cross-interference issue that cause because of crossing waveguide; Improved the communication efficiency of device greatly; And entire device only needs 17 micro-ring resonators just can realize ten six tunnel well behaved ROADM, the filter cell that each road all is made up of different two little ring of radius and mutual Uncrossed waveguide, thus guaranteed the flat characteristic of filter cell and bigger free general scope.
(2) technical scheme
For achieving the above object; The invention provides a kind of integrated reconfigurable optical add-drop multiplexer; This reconfigurable optical add-drop multiplexer unit adopts cascade adjustable double micro-ring resonator as elementary cell; Include a plurality of cascade adjustable double micro-ring resonators, wherein each cascade adjustable double micro-ring resonator includes two mutual Uncrossed straight wave guides and two disc waveguides that radius is different, and these two disc waveguides are between two straight wave guides; And and a predetermined coupling distance is arranged between two straight wave guides, and a predetermined coupling distance is arranged also between two disc waveguides.
In the such scheme; The bigger disc waveguide of this a plurality of shared radius of cascade adjustable double micro-ring resonator; The disc waveguide that this radius is bigger is equivalent to the main line of each channel; Each channel all is to be made up of radius different big disc waveguide and little disc waveguide, thus realize the cascade dicyclo unique flat-top filtering characteristic, broadening the free general scope of device.
In the such scheme, the radius of said big disc waveguide is much larger than the radius of little disc waveguide, can be in the more little disc waveguide of arranging of the peripheral two dimension of big disc waveguide, thus increase the number of channel.
In the such scheme, this cascade adjustable double micro-ring resonator is the tunable micro-ring resonator through hot optical modulation.
In the such scheme; This reconfigurable optical add-drop multiplexer is based on the two micro-ring resonators of adjustable cascade of mutual not crossing waveguide structure and constitutes; Channel spacing when the radius through designing big disc waveguide and the way of thermal tuning are set to device work with the free general scope of big disc waveguide is supposed wavelength X like this
1Satisfy the condition of resonance of big disc waveguide, then wavelength is λ
2=λ
1+ FSR, λ
3=λ
1+ 2FSR ... λ
n=λ
1The light signal of+nFSR also satisfies the condition of resonance of big disc waveguide, so as long as make the little disc waveguide in a certain road satisfy λ through thermal tuning
1, λ
2=λ
1+ FSR, λ
3=λ
1+ 2FSR ... λ
n=λ
1A resonance wavelength the among+nFSR; Then the flashlight of this wavelength just can be downloaded on this path channels; Do not satisfy straight-through that the flashlight of little disc waveguide condition of resonance will have no effect, so just can realize that going up of required light signal in the optical network node download and do not influence the transmission of other light signals through the mode of integrated optics.
In the such scheme; This reconfigurable optical add-drop multiplexer is made up of the cascade adjustable double micro-ring resonator of 16 parallel arranged; Multi-wavelength signals light from single-mode fiber is imported at input end; Respectively the uploading end and download the light signal road up and down arbitrarily that end realizes carrying the specific wavelength of local service of device, and do not influence the transmission of other flashlights.
In the such scheme, the micro-ring resonator that said radius is bigger is that the filter cell institute of 16 parallel arranged is shared, and, confirm its free general scope through designing its radii size, and be used as the channel spacing of device to its free general scope.
In the such scheme, the concrete implementation procedure of said cascade adjustable double micro-ring resonator is: input end comprises wavelength X by carrying
1, λ
2=λ
1+ FSR, λ
3=λ
1+ 2FSR ... λ
n=λ
1The single-mode fiber of the multi-wavelength signals of+nFSR carries out the signal input, and FSR is the free general scope of big ring, and it is tuning to utilize thermo-optic effect that the less micro-ring resonator of radius in the filter cell is carried out, and makes the corresponding resonance wavelength of each resonator element
i, wherein, i=1,2 ..., 16, thereby upload end and download end can on download the resonance wavelength of a correspondence
iIf the resonance wavelength that first resonator element is corresponding is λ
1, then can download that optical wavelength is λ in the main line downloading end
1Flashlight, simultaneously can to upload the wavelength that carries local information be λ uploading end
1Flashlight; Be λ at i.e. first channel completion of first filter cell wavelength like this
1The road up and down of flashlight; 15 channels for other also have same function, on the local network node place just can be simultaneously, download the flashlight of 16 road different wave lengths like this, thereby accomplish the multiplexing function of slotting branch of 16 tunnel different light signals.
(3) beneficial effect
Can find out that from technique scheme the present invention has following beneficial effect:
Integrated reconfigurable optical add-drop multiplexer provided by the invention utilizes SOI technology ripe and the CMOS process compatible, makes that the device entire area is little, and is low in energy consumption, the good stability of device, and information throughput is big, is convenient to electricity component integrated; Utilize the characteristic of the wavelength dynamic reconfigurable of device to carry out Long-distance Control, make network have dynamic reconfigurable and self-healing function, thereby reduced the operation and the maintenance cost of network network.The free general scope (FSR) that adopted cascade radius different bicyclic filter construction broadening thus can increase the number of channel of device, the increase of the number of channel can increase the information throughput of device greatly.Utilize the flat-top filtering characteristic of the uniqueness that dicyclo has to improve the stability of device greatly; And entire device does not have any waveguide intersection, thus loss and the cross-interference issue of having avoided crossing waveguide to cause; And entire device only needs 17 little rings; Compare with the general ROADM with identical performance, little number of rings of its use significantly reduces, thereby makes entire device compact more.
Description of drawings
Fig. 1 is the filter construction of the two micro-ring resonators of parallel cascade;
Fig. 2 is integrated 16 road reconfigurable optical add-drop multiplexer structure synoptic diagram based on the two micro-ring resonators of cascade of mutual not crossing waveguide.
Embodiment
For making the object of the invention, technical scheme and advantage clearer, below in conjunction with specific embodiment, and with reference to accompanying drawing, to further explain of the present invention.
The reconfigurable optical add-drop multiplexer that the present invention proposes be based on can be integrated the micro-ring resonator structure, be fit to realize, like SOI, SiN and III-V family material with various material.This reconfigurable optical add-drop multiplexer is to utilize the method for learning based on the integrated photon of silicon-based micro ring resonator to realize that than other implementations, advantage of the present invention is: utilize ripe SOI technology; Component compact; Low in energy consumption, device stability is good, is convenient to electricity component integrated; Utilize the characteristic of the wavelength dynamic reconfigurable of device to carry out Long-distance Control, thereby make network have operation and maintenance cost that dynamic reconfigurable and self-healing function have reduced network network.The free general scope (FSR) that adopted cascade dicyclo filter construction broadening thus can increase the number of channel of device, the increase of the number of channel can increase the information throughput of device greatly.Utilize the flat-top filtering characteristic of the uniqueness that dicyclo has to improve the stability of device greatly.For integrated photon is learned; Consume of waveguide intersection and cross-interference issue are problems that is difficult to avoid; No any crossing waveguide occurs in the entire device and this device architecture that we propose makes through design cleverly; Thereby avoided intersecting the consume bring and crosstalking because of waveguide, this also is the unique distinction of this device architecture.
Fig. 1 is the filter construction of the two micro-ring resonators of parallel cascade.Port I is an input end, and port T is straight-through end, and port D is for downloading end, and port A is for uploading end, and supposes that the resonance wavelength of two little rings all is λ
1, the free general scope (FSR) of big ring is confirmed as 0.8nm through the way of radial design and thermal tuning.Comprise λ in the input end input
1, λ
2=λ
1+ FSR, λ
3=λ
1+ 2FSR ... λ
n=λ
1The multi-wavelength signals of+nFSR (FSR is the free general scope of big ring) then has wavelength in big ring be λ
1, λ
2λ
nFlashlight resonance within it, than for the circlet, have only λ for radius
1Satisfy condition of resonance, so wavelength is λ
1Flashlight at download port D by following road, do not satisfy the flashlight of other wavelength of condition of resonance and export at straight-through port T, can upload at last load port A that to satisfy condition of resonance, carry the local signal wavelength be λ
1Flashlight.This filter construction can be from network up and down the required flashlight in road accomplish light and insert and divide multiplexing function, thereby and can utilize the refractive index of the tuning little little ring of thermo-optic effect to change the resonance wavelength of little little ring, download λ thereby can go up
1, λ
2λ
nIn the arbitrarily flashlight of wavelength, i.e. resonance wavelength dynamic reconfigurable.And its whole filter structure waveguide do not occur and intersects, thereby has avoided intersecting the loss that brings and crosstalking because of waveguide.
The 16 road reconfigurable optical add-drop multiplexer structure synoptic diagram of Fig. 2 for forming by Fig. 1 structural unit parallel cascade.Port I is an input end, and port T is straight-through end, port D
1, D
2D
16For downloading end, port A
1, A
2A
16For uploading end.Suppose that comprising wavelength in the input end input is λ
1, λ
2=λ
1+ FSR, λ
3=λ
1+ 2FSR ... λ
16=λ
1Multi-wavelength signals light and the wavelength X of+16FSR (the free general scope of the big ring of FSR)
1, λ
2λ
16Reference numeral is 1,2 respectively ... The resonance wavelength of 16 filter cell is then at download port D
1, D
2D
16Can download wavelength respectively is λ
1, λ
2λ
16Flashlight, at last load port A
1, A
2A
16Can upload the wavelength that carries local information respectively is λ
1, λ
2λ
16Flashlight.For the flashlight of other wavelength that do not satisfy condition of resonance will have no effect in straight-through end T output, and its, thereby can change the operation wavelength of a certain channel through the less little ring of the tuning radius of the way of thermal tuning.So far, this device light of having accomplished 16 tunnel wavelength signals insert to divide multiplexing.
A kind of integrated reconfigurable optical add-drop multiplexer provided by the invention can be used number of various materials, and principle is directly perceived, realize simply, and good stability, information throughput is big.All little rings all adopt identical design and processes flow process; The less resonance wavelength of micro-ring resonator under the situation that does not add thermal tuning of radius is identical in each filter cell, and we can change the resonance wavelength of little micro-ring resonator through the way of thermal tuning to satisfy the local needs of downloading wavelength optical signals of going up.
So far, we with reference to description of drawings the present invention realize a kind of principle of integrated reconfigurable optical add-drop multiplexer.Need to prove; The related description of instantiation wherein, manufacturing materials and Tuning mechanism only is in order to illustrate the need of principle; Be not limited to the present invention; All within spirit of the present invention and principle, any modification of being made, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1. integrated reconfigurable optical add-drop multiplexer; It is characterized in that; This integrated reconfigurable optical add-drop multiplexer is based on the cascade adjustable double micro-ring resonator of mutual not crossing waveguide structure and constitutes; Adopt cascade adjustable double micro-ring resonator as elementary cell, include 16 cascade adjustable double micro-ring resonators, wherein each cascade adjustable double micro-ring resonator includes two mutual Uncrossed straight wave guides and two disc waveguides that radius is different; The different disc waveguide of these two radiuses is bigger disc waveguide of radius and the less disc waveguide of radius; The different disc waveguide of these two radiuses between two mutual Uncrossed straight wave guides, and and these two mutual Uncrossed straight wave guides between a predetermined coupling distance is arranged, and a predetermined coupling distance is arranged also between the different disc waveguide of two radiuses;
Wherein, The bigger disc waveguide of this 16 shared these radiuses of cascade adjustable double micro-ring resonator; The disc waveguide that this radius is bigger is equivalent to the main line of each channel; Each channel all is to be made up of said radius bigger disc waveguide and the less disc waveguide of radius, thus realize the cascade dicyclo unique flat-top filtering characteristic, broadening the free spectral limit of the bigger disc waveguide of this radius;
These 16 cascade adjustable double micro-ring resonator parallel arranged; Multiple wavelength optical signal from single-mode fiber is imported at input end; Respectively the uploading end and download the light signal road up and down arbitrarily that end realizes carrying the specific wavelength of local service of this integrated reconfigurable optical add-drop multiplexer, and do not influence the transmission of other light signals;
Confirm its free spectral limit through designing the bigger disc waveguide radii size of this radius, and be used as the channel spacing of this integrated reconfigurable optical add-drop multiplexer to its free spectral limit.
2. integrated reconfigurable optical add-drop multiplexer according to claim 1; It is characterized in that; The radius of the disc waveguide that said radius is bigger is much larger than the radius of the less disc waveguide of said radius; Can be in the less disc waveguide of more radius of arranging of the peripheral two dimension of the bigger disc waveguide of said radius, thus the number of channel increased.
3. integrated reconfigurable optical add-drop multiplexer according to claim 1 is characterized in that, this cascade adjustable double micro-ring resonator is the tunable micro-ring resonator through hot optical modulation.
4. integrated reconfigurable optical add-drop multiplexer according to claim 1; It is characterized in that; Channel spacing when the free spectral limit of the disc waveguide that the radius through designing the bigger disc waveguide of said radius and the way of thermal tuning are bigger with this radius is set to this integrated reconfigurable optical add-drop multiplexer work is supposed wavelength X like this
1Satisfy the condition of resonance of the bigger disc waveguide of said radius, then wavelength is λ
2=λ
1+ FSR, λ
3=λ
1+ 2FSR ... λ
n=λ
1+ (n-1) light signal of FSR also satisfies the condition of resonance of the bigger disc waveguide of this radius, so as long as make the less disc waveguide of radius in a certain road satisfy λ through thermal tuning
1, λ
2=λ
1+ FSR, λ
3=λ
1+ 2FSR ... λ
n=λ
1+ (n-1) resonance wavelength among the FSR; Then the light signal of this wavelength just can be downloaded on this path channels; Do not satisfy straight-through that the light signal of the bigger disc waveguide condition of resonance of radius will have no effect; So just can realize going up of required light signal in the optical network node to download and not influence the transmission of other light signals that wherein FSR is the free spectral limit of the bigger disc waveguide of said radius through the mode of integrated optics.
5. integrated reconfigurable optical add-drop multiplexer according to claim 1 is characterized in that, the concrete implementation procedure of said cascade adjustable double micro-ring resonator is:
Input end comprises wavelength X by carrying
1, λ
2=λ
1+ FSR, λ
3=λ
1+ 2FSR ... λ
n=λ
1+ (n-1) single-mode fiber of the multiple wavelength optical signal of FSR carries out the signal input; FSR is the free spectral limit of the bigger disc waveguide of said radius; It is tuning to utilize thermo-optic effect that the less disc waveguide of radius in the said adjustable double micro-ring resonator is carried out, and makes the corresponding resonance wavelength of each cascade adjustable double micro-ring resonator
i, wherein, i=1,2 ..., 16, thereby upload end and download end can on download the resonance wavelength of a correspondence
iIf the resonance wavelength that first cascade adjustable double micro-ring resonator is corresponding is λ
1, then can download that optical wavelength is λ in the main line downloading end
1Light signal, simultaneously can to upload the wavelength that carries local information be λ uploading end
1Light signal; Be λ at i.e. first channel completion of first adjustable double micro-ring resonator wavelength like this
1The road up and down of light signal; 15 channels for other also have same function, on the local network node place just can be simultaneously, download 16 tunnel wavelength optical signals like this, thereby accomplish the multiplexing function of slotting branch of 16 tunnel different light signals.
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| CN103941339B (en) * | 2014-03-21 | 2016-05-04 | 哈尔滨工程大学 | Micro-ring resonator based on hollow inwall waveguide fiber and preparation method thereof |
| CN105259614A (en) * | 2015-11-20 | 2016-01-20 | 大连民族大学 | Band pass box-type filter based on ring resonator structure |
| CN106788864B (en) * | 2016-11-28 | 2018-06-19 | 广西大学 | A kind of integrated reconfigurable optical add-drop multiplexer |
| CN107479217A (en) * | 2017-09-11 | 2017-12-15 | 山东大学 | A kind of reconfigurable optical waveguide and its application based on lattice structure |
| CN109802743B (en) | 2017-11-17 | 2020-08-07 | 海思光电子有限公司 | Loading and unloading filter and optical add-drop multiplexer |
| WO2020073250A1 (en) * | 2018-10-10 | 2020-04-16 | 华为技术有限公司 | Optical add drop multiplexer and optical signal processing method |
| CN109254351B (en) * | 2018-12-03 | 2020-12-29 | 浙江大学宁波理工学院 | Upper and lower filter based on single antisymmetric multimode periodic waveguide microcavity |
| CN110764191A (en) * | 2019-11-01 | 2020-02-07 | 灵芯光电(天津)有限公司 | Micro-ring-based rectangular optical filter and design method thereof |
| CN110737052B (en) * | 2019-11-04 | 2020-06-16 | 兰州大学 | Reconfigurable arbitrary optical mode exchanger based on micro-ring resonator |
| CN113093338B (en) * | 2020-01-08 | 2022-12-13 | 华为技术有限公司 | Up-and-down loading filter, optical add-drop multiplexer and wavelength control method |
| CN115236883A (en) * | 2021-04-22 | 2022-10-25 | 苏州大学 | Chip filter based on liquid crystal |
| CN113572563B (en) * | 2021-06-30 | 2022-06-21 | 中山大学 | Optical add-drop multiplexer for optical transmission channel scheduling |
| CN114858276B (en) * | 2022-07-07 | 2022-09-09 | 南京航空航天大学 | Multi-port wide-spectrum shaping device and calculating spectrometer |
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| KR100907251B1 (en) * | 2007-10-18 | 2009-07-10 | 한국전자통신연구원 | Multi-channel Ring-resonator based wavelength-division-multiplexing optical device |
| CN101615957B (en) * | 2008-06-25 | 2012-07-04 | 中国科学院半导体研究所 | Networking method for realizing integrated high-order ROADM |
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