CN101615957A - A kind of network-building method of realizing integrated high-order ROADM - Google Patents
A kind of network-building method of realizing integrated high-order ROADM Download PDFInfo
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Abstract
The present invention is a kind of network-building method of realizing integrated high-order ROADM.The present invention passes through the adjustable little ring wave filter classification filtering of low order with multi-channel signal, reduce the number of channel in the waveguide step by step, utilize limited modulation bandwidth, hierarchical modulation realizes the ROADM of multi-channel signal, and the number of channel that makes the optics add drop multiplex that can realize is far above the modulation bandwidth of tunable filter.Simultaneously in order to reduce loss with can the more little ring of cascade, the present invention also optimizes the structure of waveguide infall and the coupled structure of waveguide and optical fiber.Can make the reconfigurable wavelength number of realization much larger than common networking mode by the present invention.
Description
Technical field
The present invention relates to the integrated optical device field, be specifically related to a kind of network-building method that utilizes the adjustable SOI nano wire of low order wave guide ring filter to realize integrated high-order ROADM.
Background technology
Downloading add-drop multiplexer (OADM) on the optics is the node device of Networks of Fiber Communications, its basic function is to download to lead to local signal in the optical channel from optical fiber, upload the signal that the local user mails to other node users simultaneously and enter fiber channel, and do not influence the transmission of other wavelength in channel, and keep the transparency in light territory.If select certain or some fixing wavelength channels to upload and download, then be called fixedly OADM (Fixed OADM); If can optionally upload and download certain or some wavelength channels of needing, then be called restructural OADM (ReconfigurableOADM, ROADM).As the nucleus equipment of optical transfer network, with respect to fixing OADM, restructural OADM has brought the facility that more business carry out and the reduction of operation cost for the operation of network.At first, the needs that the wavelength level business is carried out are supported in the use of ROADM, in the face of the big customer provides wavelength level business (as supporting storage area network etc.), use the ROADM node device, only needing to carry out the far-end configuration by network management system gets final product, be very easy to carrying out of this newtype business, improved reaction speed client's new demand.Secondly, the use of ROADM is convenient to carry out the network planning, reduces running cost.For the business that happens suddenly and be difficult to predict, ROADM is by providing the re-configurability of node, makes the also reconstruct easily of DWDM network, and therefore the requirement to the network planning reduces greatly, and the also enhancing greatly of the ability of reply emergency case, whole networks efficiency is had greatly improved.In addition, the use of ROADM is convenient to safeguard and reduce maintenance cost, adopts ROADM, most regular maintenance operations (comprise that increase is professional and carry out circuit adjustment etc.) can be undertaken by network management system, do not need manual operation, greatly improved operating efficiency, reduced maintenance cost.Restructural will become the mainstream technology of OADM, cause both domestic and external showing great attention to, and will be used widely in fields such as high-speed high capacity optical fiber communication and high-speed optical interconnections.ROADM can be according to the demand of different user on the network to bandwidth, and in real time dynamic allotting network resource makes network configuration more flexible and intelligent, and service efficiency is higher.
Developing integrated ROADM device is a practical way that reduces the ROADM equipment cost, integrated ROADM device has reduced the whole cost of optics in the ROADM equipment, but the core optical component that directly modularization, high reliability is provided, has wavelength disposal ability and multiple function flexible combination for equipment vendor.The major technique approach of present integrated ROADM module comprises: technology such as acousto-optic tunable filtering, fiber grating filtering, silica-based mixing are integrated, photonic crystal and annular resonance.Wherein, plant the ROADM module commercialization of technology based on first three, but their majorities are based on the traditional technology and the assembling of discrete component, device size is big, integrated level is low, and cost is higher, and these are all restricting their application in ROADM; ROADM research based on photonic crystal also rests on the imagination stage; And based on the scheme of SOI nano wire wave guide ring filter be and the complete compatible silicon-base plane optical waveguide technique of CMOS technology, utilize the resonance effect of toroidal cavity resonator to come the corresponding wavelength in road up and down, carry out the ROADM that hot light or electrooptic modulation just can realize having a plurality of wavelength selection functions by effective refractive index to transmission mode in the toroidal cavity resonator, advantages such as this technology has that size is minimum, cost is low, simple in structure, line width are the focus projects of research and development competitively at present.
Fig. 1 is the schematic diagram of SOI nano wire wave guide ring filter, and wherein two straight lines are represented the straight wave guide structure, and annulus is represented ring resonator, and the operation principle of loop filter is: the radius of supposing little ring is R, and wherein the effective refractive index of transmission waveguide is n
Eff, ring resonator has the resonance frequency of intrinsic, when incident wavelength satisfies:
N wherein
gIt is the group index of communication mode, relevant with frequency, can think that in limited spectrum width its value is constant, by following formula as can be seen, free spectrum width can be regulated by the radius that changes little ring, but since processing technology and loss restriction, the radius of little ring can not infinitely reduce, at present produced little ring that free spectrum width is tens nm, its radius has only several um.When the wavelength that transmits in the incident waveguide satisfies the condition of resonance of ring resonator, ring resonator can play the effect of UNICOM, with the filtering signals of this wavelength in another vertical waveguide, if the wavelength signals of condition of resonance is satisfied in same other end incident in vertical waveguide, can be in horizontal waveguide by resonant cavity with this filtering signals, as shown in the figure, this UNICOM effect of resonant cavity is two-way.And when the included wave-length coverage of incoming signal surpassed the free spectrum width of resonant cavity, all wavelength that satisfy condition of resonance all were downloaded in the vertical waveguide.
Fig. 2 be in the incident waveguide during continuous wave incident in downloading waveguide normalized spectral response curve, can be clearly seen that the existence of the selectivity and the free spectrum width of resonance wavelength.Utilize the plasma effect in the silicon, inject the carrier concentration that changes ring resonator by thermal effect or charge carrier electricity, change the effective refractive index of communication mode in the resonant cavity, realize modulation, promptly changed the filter wavelength of filter ring resonator intrinsic resonance wavelength.Be modulated to example with heat, general communication wavelengths is spaced apart Δ λ, realize that it be Δ n that variation that resonance wave grows so fast needs effective change of refractive, the empirical equation that obtains according to the thermal effect principle of silicon materials
Δn＝9.48×10
-5+3.47×10
-7ΔT-1.49×10
-7(ΔT)
2，
Can calculate required variations in temperature by following formula, by growing metal electrode on ring resonator, utilize the temperature of the thermal effect change ring resonator of electrode, calculate the applied voltage V that realizes required variations in temperature correspondence according to the concrete physical dimension of used little ring and heating electrode, the material specific heat capacity and the resistance value of heating electrode etc. separately, just can realize modulation easily filter wavelength by external alive modulation.Realized at present the modulation of single SOI nano wire wave guide ring filter 4 Δ λ bandwidth.
Fig. 3 is the simplest networking schematic diagram that utilizes adjustable SOI nano wire wave guide ring filter to realize ROADM, the corresponding different filter wavelength of each SOI nano wire wave guide ring filter during initial state, different wave length signal in the waveguide is filled into different download ports by the filter of correspondence, realizes the download of signal in the locality; Simultaneously the last load port of each filter correspondence is uploaded signal loading in main transmission waveguide with this locality of respective wavelength, has realized that each wavelength signals is in the download of locality and upload.By the filter wavelength of adjustable ring mode filter, can change the wavelength of download signal in each download port, realize the conversion of signal between each download port of different wave length, realized reconfigurable function.
The channel number that this structure can go up download is subjected to the BREATHABLE BANDWIDTH of adjustable SOI nano wire wave guide ring filter and the restriction of free spectrum width, the modulation of silicon-based micro ring filter wavelength at present has only the concentration of regulating charge carrier by the mode of hot light or electricity injection, being limited BREATHABLE BANDWIDTH is the principal element of number of downloads on the wavelength-limited, its tunable filter range is very narrow, have only several nm, and the channel spacing of standard is 0.8nm in the optical communication at present, single little ring can only be realized the ROADM of several channels, can not satisfy the demand of existing communication network to channel quantity far away.
Summary of the invention
In order to overcome above shortcoming, the present invention has designed the adjustable SOI of a kind of employing low order (silicon oninsulator) nano wire wave guide ring filter by special networking mode classification filtering, realizing the network-building method of multichannel high-order Reconfigurable Optical Add/drop Multiplexer (ROADM), the BREATHABLE BANDWIDTH filter that promptly a kind of utilization has several nm is realized tens nm even the networking technology of the add drop multiplex of wavelength signals in the wide region more.
The present invention proposes a kind of networking technology that realizes high-order ROADM based on the adjustable SOI nano wire of low order wave guide ring filter.The principal character of this technical scheme is, utilizes the limited free spectrum width of loop filter, and the multichannel incident wavelength is carried out classification filtering, and the number of wavelengths of respectively downloading in the waveguide to be propagated is reduced step by step, and the single wavelength that finally is implemented in each output port is downloaded; Utilize the controllability of SOI nano wire wave guide ring filter simultaneously, the wavelength of the transmission in the download waveguides at different levels is regulated step by step,, can export any wavelength that transmits in the main channel at arbitrary port by designing suitable logic control circuit.Classification filtering has overcome the limited modulation bandwidth of single tunable filter, and all signals that make transmission bandwidth surpass modulation width can be exported in each output port, considerably beyond the wave-length coverage that can modulate of single filter.Uploading of identical wavelength signals can also be finished simultaneously by the feedback waveguide in the download loop of wavelength, realizes reconfigurable optical wavelength add drop multiplex.
Because adjacent channel has definite spectrum intervals in the optical communication, in classification filtering, require to have identical free spectrum width with each the little ring in the one-level, general requirement is the integral multiple of channel spacing; To have different wavelength groupings in the waveguide in order realizing respectively downloading simultaneously, to require the corresponding initial filter wavelength difference of each little ring, be generally communication wavelengths integral multiple at interval, could guarantee like this transmission channel in the waveguide is effectively screened.The radius and the stiffness of coupling that design little ring as the case may be obtain specific free spectrum width and filter wavelength, each grade filtering utilizes the free spectrum width of little ring that incident wavelength is once screened, the all wavelengths signal that satisfies the micro-ring resonant frequency all is downloaded in the incident waveguide of next stage filter, by continuous cascade, the wavelength number that transmits in subordinate's waveguide constantly reduces, and will realize the output of single wavelength at exit ports at last.And by modulating the resonance wavelength that can change each little ring, regulate step by step to change step by step and respectively download the wavelength grouping of transmitting in the waveguide, by suitable logic control circuit, control the resonance wavelength of each little ring, can realize the conversion of wavelength between each download port.In order to cover whole signal in band, require the modulation bandwidth of each little ring wave filter must cover its whole free spectrum width, because the free spectrum width of the little ring of requirement for restriction of modulation bandwidth is narrower, little ring radius according to the analysis needs of front is bigger, compare the easier realization of processes with the little ring of minor radius, the loss in little ring is also lower.
The restructural channel number enough realized of multipotency is many more more for the progression of little ring cascade, and the main cause of restriction cascade progression is the loss in the waveguide, taked optimal way in order to reduce loss the present invention, having comprised: optimize the manufacture craft of waveguide, the roughness that reduces sidewall is to reduce loss; Optimize the chi structure between the waveguide, as shown in Figure 4, take the chi structure of taper, the mode field area of harmless broadening waveguide reduces because intersect scattering loss and the crosstalking to the download wavelength signals that causes; Adopt as shown in Figure 5 back taper structure in coupling place of waveguide two ends and optical fiber, the back taper structure can effectively be launched the effective area of communication mode in the waveguide, makes that mode field area mates more in itself and the optical fiber, reduces the coupling loss of optical fiber and waveguide.
Particularly, the present invention proposes a kind of network-building method of realizing integrated high-order ROADM, comprising:
Signal in the optical fiber optical communication trunk roads is coupled in the SOI nano wire straight wave guide;
Utilize the free spectrum width of the adjustable SOI nano wire of low order loop filter that the wavelength that satisfies same micro-ring resonant condition in the trunk roads is carried out classification filtering;
Reduce the number of wavelengths of downloading in the waveguide step by step,, finally realize of the download of single wavelength signal at different output ports by multi-stage cascade;
Local signal is imported from corresponding port simultaneously, uploads in the main line;
Logic control circuit is set to modulate the operation wavelength of filters at different levels, realizes the conversion of different wave length at different download ports.
Further, described adjustable SOI nano wire wave guide ring filter is to be coupled to form by two intersection nano wire straight wave guides and nano wire ring resonator.
Further, have identical free spectrum width and modulation bandwidth with the inferior loop filter of one-level in the described loop filter, but initial filter wavelength difference; And the modulation bandwidth of described loop filter covers all wavelengths channel in its free spectrum width.
Further, the resonance wavelength of described ring resonator equals the filter wavelength of filter, and it realizes modulation by the carrier density that thermo-optic effect or electricity inject the modulation waveguide.
Further, described uploading is by uploading with the corresponding feedback loop of download channels signal to be uploaded step by step, realizes signal uploading to the main line at last.
Further, different described number of wavelengths realizes the progression difference that complete partial wave is required, the decision of the modulation bandwidth that the wavelength number of downloads that can realize can be realized by little ring modulator.
Further, describedly upload the feedback waveguide of removing secondary partial wave loop, at the bundling device of one 9 * 1 of the feedback port series connection in one-level partial wave loop, described bundling device can cover all 36 road signals in the main line to the spectral response width.
Further, described one-level partial wave is divided into 4 groups of wavelength combinations with incoming signal, uploading by the bundling device that links to each other with its corresponding download filter of every group of wavelength finished, upload signal and enter one-level download waveguide by each self-corresponding 9 * 1 bundling device, utilize the bidirectional filtering function of filter, upload signals reverse and enter the main line, realize uploading of signal.
Further, described optical fiber and the coupling of waveguide are that SOI nano wire waveguide fabrication with coupled end becomes the back taper structure.
Further, described intersection nano wire straight wave guide is the chi structure of taper.
Can realize finally that by above-mentioned cascade system reconfigurable wavelength number is much larger than common networking mode shown in Figure 3.
Description of drawings
Fig. 1 is the schematic diagram of SOI nano wire wave guide ring filter;
Fig. 2 is a normalized spectrum diagram in the download waveguide of SOI nano wire wave guide ring filter;
Fig. 3 utilizes adjustable SOI nano wire wave guide ring filter to realize the simple networking schematic diagram of ROADM;
Fig. 4 is the taper vertical waveguide chi structure that the present invention proposes;
Fig. 5 is the back taper waveguide fiber coupled structure that the present invention proposes;
Fig. 6 is that the adjustable SOI nano wire wave guide ring filter that utilizes that the present invention proposes is realized the classification filter bank net mode of 36 * 36 road ROADM;
Fig. 7 is 9 * 1 broadband bundling devices that the present invention proposes.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with the embodiment of 36 * 36 road concrete ROADM, and with reference to accompanying drawing, the present invention is described in more detail.
Fig. 6 utilizes the adjustable SOI nano wire of low order wave guide ring filter to realize the networking mode schematic diagram of 36 * 36 tunnel Reconfigurable Optical Add/drop Multiplexer, the corresponding specific adjustable little ring wave filter as shown in Figure 1 of each node.
1 port correspondence be the input of main channel, contain 36 tunnel different wavelength in the signal of incident, wave-length coverage is in the desired C-band of optical communication, the wavelength interval is Δ λ, satisfies the requirement of optical communication standard.The present invention is with λ
9For example illustrates the operation principle of whole ROADM, thin arrow is represented λ
9The following paths of wavelength, the corresponding paths on it of thick arrow.
As shown in FIG., the loop filter in each grade has identical free spectrum width and modulation bandwidth, and modulation bandwidth covers whole free spectrum width.The free spectrum width of the first order is 4 Δ λ, modulation bandwidth is 3 Δ λ, but the initial resonance wavelength difference of each ring, 4 wavelength in the corresponding free spectrum width of difference, can guarantee that all wavelengths signal in the waveguide can both download from a certain little ring, so four rings are divided into 4 groups of different wavelength combinations with incident wavelength, these 4 kinds of wavelength combinations determine, non-Wei λ
1λ
5λ
9λ
13λ
17λ
21λ
25λ
29λ
33, λ
2λ
6λ
10λ
14λ
18λ
22λ
26λ
30λ
34, λ
3λ
7λ
11λ
15λ
19λ
23λ
27λ
31λ
35, λ
4λ
8λ
12λ
16λ
20λ
24λ
28λ
32λ
36, λ
9Export from encircle 2 corresponding port when initial, the signal in the download waveguide of ring 2 is λ
1λ
5λ
9λ
13λ
17λ
21λ
25λ
29λ
33Can realize the different port output of these several groups of wavelength combinations at first order partial wave by the resonance wavelength of modulating each ring, resonance wavelength changes delta λ when applied voltage changes V in the analysis in front is if realize λ
9Download from encircling 4, need be to encircling the voltage that 4 control circuit loads 2V, other little ring loads different voltage according to difference of downloading wavelength combinations, requires the modulation simultaneously of each ring, the corresponding different download wavelength combinations of each ring that makes.λ during initial state
9Enter the next stage partial wave with other 8 wavelength from encircling 2 corresponding port, the secondary filtering of having drawn among the figure and having encircled 2 correspondences also has similar secondary splitter structure correspondence for other three rings in the one-level filtering, is omitted here.Secondary partial wave and one-level partial wave are similar, and the free spectrum width of three little rings and modulation bandwidth are 3 Δ λ, 2 Δ λ, but the original resonance frequency difference of each ring, three wavelength in the corresponding free spectrum width respectively.λ
9This group wavelength combinations λ at place
1λ
5λ
9λ
13λ
17λ
21λ
25λ
29λ
33Enter the secondary partial wave and be further divided into three tunnel different wavelength combinations λ
1λ
13λ
25, λ
5λ
17λ
29, λ
9λ
21λ
33, λ
9Export from encircle 8 corresponding port when initial, the signal in the download waveguide of ring 8 is λ
9λ
21λ
33Similar with first order partial wave, can realize of the different port output of these several groups of wavelength combinations by the resonance wavelength of modulating each ring at second level partial wave, realize λ
9Download from encircling 5, need be to encircling the voltage that 5 control circuit loads V, other little ring loads different voltage according to difference of downloading wavelength combinations.λ during initial state
9Enter the next stage partial wave with other 2 wavelength from encircling 6 corresponding port, drawn among the figure and encircled three grades of filtering of 6 correspondences, similar secondary splitter structure correspondence is also arranged, omitted equally here for other two rings of secondary filtering.Three grades of partial waves and front two-stage partial wave are similar, the free spectrum width of three little rings and modulation bandwidth are 5 Δ λ, 4 Δ λ, the output of signal is all arranged in each little ring corresponding download port when guaranteeing initial state, need from 5 little rings with the different resonance wavelengths of identical free spectrum width, select three resonance wavelengths and satisfy λ respectively
9λ
21λ
33λ
9When initial state, download in the output waveguide λ 9 from encircling
21, λ
21Download to separately output waveguide respectively by other two rings, finish last partial wave, realize the single output of road port down single wavelength signal.Realize λ
9Download from encircling 10, need be to encircling the voltage that 10 control circuit loads 3V, other little ring loads different voltage according to difference of downloading wavelength, realizes the conversion of different wave length between different port.
λ during initial state
9Road under encircling 9, and λ
9The signal of setting out on a journey from port one 2 through encircling the 9 following road waveguides that utilize the bidirectional filtering characteristic of filter to enter the secondary partial wave, through feedback loop, by encircling the 3 following road waveguides that enter the one-level partial wave, pass through the feedback loop of one-level partial wave again, enter the main line and finish signal and upload by encircling 2, download equally with signal, upload signal and also finish step by step, change the output port of download signal, the input port of uploading signal also changes thereupon.It is at 9 * 1 broadband bundling devices as shown in Figure 7 of port 8 series connection that another kind is uploaded mode, remove the feedback loop of I and II partial wave, with 9 input ports of bundling device as the input port of uploading signal, the corresponding ring 2 of each port is downloaded the signal end of uploading of a certain wavelength in waveguides, upload signal and enter the main line and finish uploading of signal by encircling 2 from port 8 through bundling device, other three one-levels are downloaded little ring also has corresponding bundling device to upload end as signal.
By above process as can be seen: this method is regulated one-level, secondary, three grades of filtering step by step can realize the output of any one tunnel in 36 tunnel wavelength signals in arbitrary port, simultaneously can be with the wavelength of correspondence upload signal loading in main waveguide, the ROADM function that has realized.
Though described the present invention in detail with reference to the foregoing description, should be appreciated that the present invention is not limited to the disclosed embodiments, for the technical staff of this professional domain, can carry out various changes to its form and details.This invention is intended to contain the interior various distortion of spirit and scope of appended claims.
Claims (10)
1, a kind of network-building method of realizing integrated high-order ROADM is characterized in that, comprising:
Signal in the optical fiber optical communication trunk roads is coupled in the SOI nano wire straight wave guide;
Utilize the free spectrum width of the adjustable SOI nano wire of low order loop filter that the wavelength that satisfies same micro-ring resonant condition in the trunk roads is carried out classification filtering;
Reduce the number of wavelengths of downloading in the waveguide step by step,, finally realize of the download of single wavelength signal at different output ports by multi-stage cascade;
Local signal is imported from corresponding port simultaneously, uploads in the main line;
Logic control circuit is set to modulate the operation wavelength of filters at different levels, realizes the conversion of different wave length at different download ports.
2, method according to claim 1 is characterized in that, described adjustable SOI nano wire wave guide ring filter is to be coupled to form by two intersection nano wire straight wave guides and nano wire ring resonator.
3, method according to claim 2 is characterized in that, has identical free spectrum width and modulation bandwidth with the inferior loop filter of one-level in the described loop filter, but initial filter wavelength difference; And the modulation bandwidth of described loop filter covers all wavelengths channel in its free spectrum width.
4, method according to claim 2 is characterized in that, the resonance wavelength of described ring resonator equals the filter wavelength of filter, and it realizes modulation by the carrier density that thermo-optic effect or electricity inject the modulation waveguide.
5, method according to claim 1 is characterized in that, described uploading is by uploading with the corresponding feedback loop of download channels signal to be uploaded step by step, realizes signal uploading to the main line at last.
6, method according to claim 1 is characterized in that, different described number of wavelengths realizes the progression difference that complete partial wave is required, the decision of the modulation bandwidth that the wavelength number of downloads that can realize can be realized by little ring modulator.
7, method according to claim 1, it is characterized in that, describedly upload the feedback waveguide of removing secondary partial wave loop, at the bundling device of one 9 * 1 of the feedback port series connection in one-level partial wave loop, described bundling device can cover all 36 road signals in the main line to the spectral response width.
8, method according to claim 7, it is characterized in that, described one-level partial wave is divided into 4 groups of wavelength combinations with incoming signal, uploading by the bundling device that links to each other with its corresponding download filter of every group of wavelength finished, upload signal and enter one-level download waveguide by each self-corresponding 9 * 1 bundling device, utilize the bidirectional filtering function of filter, upload signals reverse and enter the main line, realize uploading of signal.
9. method according to claim 1 is characterized in that, described optical fiber and the coupling of waveguide are that the SOI nano wire waveguide fabrication with coupled end becomes the back taper structure.
10, method according to claim 2 is characterized in that, described intersection nano wire straight wave guide is the chi structure of taper.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101840029A (en) * | 2010-04-28 | 2010-09-22 | 中国科学院半导体研究所 | Integrated reconfigurable optical add-drop multiplexer |
| CN102629067A (en) * | 2012-03-22 | 2012-08-08 | 中国科学院半导体研究所 | Single-bit binary system optical numeric comparison device based on micro-ring resonator |
| CN105334572A (en) * | 2015-12-16 | 2016-02-17 | 东南大学 | Silicon-based horizontal groove type minicircle polarization multiplexing and demultiplexing device |
| CN106788864A (en) * | 2016-11-28 | 2017-05-31 | 广西大学 | A kind of integrated reconfigurable optical add-drop multiplexer |
| CN110945807A (en) * | 2018-04-02 | 2020-03-31 | 华为技术有限公司 | Optical add/drop multiplexer and optical signal transmission method |
| CN111865471A (en) * | 2019-04-30 | 2020-10-30 | 华为技术有限公司 | Optical add/drop multiplexer and control method thereof |
| CN112100475A (en) * | 2020-08-14 | 2020-12-18 | 武汉光迅科技股份有限公司 | ROADM equipment maintenance method, device and computer storage medium |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| TW508458B (en) * | 2001-04-25 | 2002-11-01 | Bruce C S Chou | Micro-tunable filter structure design suitable for various spectrum |
| CN100507640C (en) * | 2005-01-28 | 2009-07-01 | 斯欧普迪克尔股份有限公司 | Silcon-based electro-optic phase modulator with reduced residual amplitude modulation |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101840029A (en) * | 2010-04-28 | 2010-09-22 | 中国科学院半导体研究所 | Integrated reconfigurable optical add-drop multiplexer |
| CN102629067A (en) * | 2012-03-22 | 2012-08-08 | 中国科学院半导体研究所 | Single-bit binary system optical numeric comparison device based on micro-ring resonator |
| CN102629067B (en) * | 2012-03-22 | 2014-03-12 | 中国科学院半导体研究所 | Single-bit binary system optical numeric comparison device based on micro-ring resonator |
| CN105334572A (en) * | 2015-12-16 | 2016-02-17 | 东南大学 | Silicon-based horizontal groove type minicircle polarization multiplexing and demultiplexing device |
| CN106788864A (en) * | 2016-11-28 | 2017-05-31 | 广西大学 | A kind of integrated reconfigurable optical add-drop multiplexer |
| CN106788864B (en) * | 2016-11-28 | 2018-06-19 | 广西大学 | A kind of integrated reconfigurable optical add-drop multiplexer |
| CN110945807A (en) * | 2018-04-02 | 2020-03-31 | 华为技术有限公司 | Optical add/drop multiplexer and optical signal transmission method |
| CN110945807B (en) * | 2018-04-02 | 2021-04-09 | 华为技术有限公司 | Optical add/drop multiplexer and optical signal transmission method |
| CN111865471A (en) * | 2019-04-30 | 2020-10-30 | 华为技术有限公司 | Optical add/drop multiplexer and control method thereof |
| CN111865471B (en) * | 2019-04-30 | 2021-12-21 | 华为技术有限公司 | Optical add/drop multiplexer and control method thereof |
| CN112100475A (en) * | 2020-08-14 | 2020-12-18 | 武汉光迅科技股份有限公司 | ROADM equipment maintenance method, device and computer storage medium |
| CN112100475B (en) * | 2020-08-14 | 2023-10-03 | 武汉光迅科技股份有限公司 | ROADM equipment maintenance method, ROADM equipment maintenance device and computer storage medium |
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