CN104079357A - Optical network system spectrum efficiency optimization method and device based on layering modulation - Google Patents
Optical network system spectrum efficiency optimization method and device based on layering modulation Download PDFInfo
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Abstract
The invention provides an optical network system spectrum efficiency optimization method and device based on layering modulation in the technical field of optical communication. At least two different data strings are mapped to corresponding points on a high-order code type constellation diagram through the layering modulation, performance of all data and transmission characteristics of the data strings are compromised by regulating the constellation diagram, and therefore two or more sets of data are simultaneously received in an error-code-free mode at corresponding node receiving ends, the total data transmission rate of signals is increased, and the spectrum efficiency of the system is improved under the condition that the bandwidth is unchanged.
Description
Technical field
What the present invention relates to is method and the device in a kind of optical communication technique field, specifically a kind of optical network system spectrum efficiency optimization method and device based on hierarchical modulation.
Background technology
Information & Communication Technology has brought earth-shaking variation to human society, along with the lifting of number of users and the appearance of various high bandwidth business, the bandwidth of effectively utilizing conventional network resources to carry out elevator system can lower the cost of every bit, and therefore the spectrum efficiency of elevator system is very important.
In optical network system, along with the increase of internet data amount and the increase of use network number, along with the variation day by day of user's request, various service needed are transmitted at optical network system simultaneously, and the transmission capacity that promotes network becomes the emphasis of research.Towards follow-on high-speed transfer network, optical network system has mainly proposed wavelength division multiplexed network (Wavelength division multiplexed, and the technology such as the network of OFDM (orthogonal frequency division multiplexing, OFDM) WDM).In WDM technology, each data are enjoyed a wavelength, thereby can effectively improve data volume; In ofdm system, each subcarrier can adopt the modulation format of high-order to effectively raise bandwidth availability ratio.For OFDM network, because the Optical Signal To Noise Ratio (OSNR) of system is along with transmission range reduces, system can adopt different modulation formats according to different transmission ranges, but because the OSNR granularity of different modulation formats is larger, therefore in multinode network, also some node also has remaining OSNR not to be fully utilized.
Through the retrieval of prior art is found, Chinese patent literature CN103840886A open (bulletin) day 2014.06.04, method for precoding based on multiple light courcess in a kind of visible light communication is disclosed, the data bit flow of serial is after through planisphere mapping, through going here and there and being converted to N channel parallel data, use respectively N orthogonal sub-carriers to modulate N channel parallel data, according to the channel fading characteristic recording in advance, draw the flat decline gain σ i of each subchannel, i=0, 1, ..., N ?1, if the received power that subchannel i expects is Pi, the flat decline gain of channel is σ i, while adopting precoding, the transmitting power of subchannel i is Pi'=Pi/ σ i, divide into groups according to the transmitting power of each subchannel afterwards, then by every group of signal stack, be loaded on different LED light sources, this technology not only can reduce PAPR that OFDM symbol the is higher impact on transmission of visible light system, improve power utilization, and by the channel fading reversion of transmitting terminal, can improve the signal to noise ratio of receiving terminal.But the defect that the prior art is compared from the present invention and the not enough situation that is not consider different nodes are not carried out the processing of power redundancy simultaneously.
Chinese patent literature CN103618687A open (bulletin) day 2014.03.05, the wireless optical orthogonal multiple carrier communication means that one has low peak-to-average power ratio (PAPR) is disclosed, carry out as follows: at transmitting terminal, first the frequency domain symbol after modulation adopts tone to inject (TI) algorithm, be converted into positive semidefinite by method of relaxation and plan protruding optimization problem, solve by general protruding optimization and method of randomization; Secondly, being mapped on subcarrier of frequency-region signal conjugation symmetry added Cyclic Prefix after anti-fast Fourier transform; Finally, time domain transmits and adds direct current biasing to drive light-emitting diode transmitting.At receiving terminal, photodiode is realized opto-electronic conversion; Signal is through amplification filtering, and analog-to-digital conversion, removes Cyclic Prefix and conjugation symmetric part after fast Fourier transform; Signal delivery is recovered in former planisphere; Last demodulation obtains receiving symbol.This technology can effectively reduce the PAPR of wireless light communication ofdm system, reduces the requirement to power amplifier and the LED linearity, reduces nonlinear distortion, improves receptivity.But the defect of the prior art compared with the present invention and deficiency are to have reduced by coding techniques the value of PAPR, but do not carry out the consideration of overall transmission data rate performance boost in conjunction with actual network system.
Chinese patent literature CN102148646A open (bulletin) day, a high sensitivity light ofdm system receiver based on avalanche diode is disclosed, be mainly used in high speed long-distance optical communication, it improves original ordinary optic fibre system, not only adopt the higher avalanche diode of sensitivity to carry out photodetection, also taked relevant algorithm to eliminate the interference that dispersion and polarization mode dispersion bring.In experiment, the 4QAM light modulated ofdm signal of 10Gbit/s has been transmitted to 50 kilometers in optical fiber, the planisphere obtaining after direct detection and the error rate have all reached good effect.On this basis, contrast and adopted avalanche photodide and traditional two kinds of different detection modes of photodiode (PIN), found to use APD to survey in the lifting that has 5.2dB aspect the sensitivity that ofdm system is received.But the defect of the prior art compared with the present invention and not enough being by the sensitivity of the skill upgrading system of hardware, and this programme is mainly on the basis that does not increase system cost, to realize the target that increases systematic bits rate by technology such as softwares.
Summary of the invention
The present invention is directed to prior art above shortcomings, propose a kind of optical network system spectrum efficiency optimization method and device based on hierarchical modulation, can improve network system spectrum efficiency based on hierarchical modulation technology.Work as data acquisition high order modulation pattern in network communicating system in, can suppose and between each data, have different priority, when the data of different data or different nodes are transmitted on a carrier wave, data can adopt different mapping modes, the planisphere that is combined into high-order transmits, change flexibly the mapping of planisphere according to the feature of each data, by adopting actual light signal to noise ratio (OSNR) situation of this mode flexibly in conjunction with network system, can promote the spectrum efficiency of heterogeneous networks.
The present invention is achieved by the following technical solutions:
The present invention relates to a kind of optical network system spectrum efficiency optimization method based on hierarchical modulation, by at least two different serial datas are mapped to corresponding point on the planisphere of high-order pattern with crossing hierarchical modulation, by regulating planisphere that the performance of each data and the transmission characteristic of serial data are traded off, and then make data more than two carry out the reception without error code at corresponding node receiving terminal simultaneously, thereby realize the raising of the transmission aggregate date rate of signal, in the situation that bandwidth is constant, promoted the spectrum efficiency of system.
In described hierarchical modulation, change the pattern of each sublayer in hierarchical modulation for different data types and data volume correspondence, thereby obtain being more suitable for the layered modulation constellation figure of transmission.
The mapping of described hierarchical modulation is preferably and will be sent to the poor signal of node OSNR and be superimposed with another one and be sent to the data of the node of OSNR better performances, and so latter two signal matches and is mapped on the different layers of hierarchical modulation.
The present invention relates to realize the device of said method, comprise: light carrier generating mechanism, modulation mechanism, optical receiver and several between modulation mechanism and optical receiver are by adjustable optical attenuator VOA, the span line in parallel of erbium-doped optical fiber amplifier EDFA and/or optical fiber composition, wherein: data to be sent are mapped to by OFDM digital signal processor structure on each subcarrier of OFDM, modulation mechanism is modulated to ofdm signal each subcarrier of light carrier generating mechanism output, be on optical channel, light signal is through each different span line, at each receiving node place, light signal being input to photoelectric detector PD receives to detect and gather and obtains the ofdm signal that each receiving node is corresponding.
In described span line in parallel, after the modulation of each transmitting node output, signal is received by arbitrary receiving node, specifically by realizing each different signal that contains carrier wave or subcarrier is transferred to each Nodes in the corresponding filtering of each Nodes.
Described light carrier generating mechanism adopts but is not limited to laser, is preferably the laser of the light carrier that can launch narrow linewidth, produces corresponding wavelength, for the modulation of light signal at transmission node end.
The described built-in OFDM chip array of OFDM digital signal processor structure, the data to be sent that serial entered by anti-fast Fourier transform IFFT are converted into the OFDM signal of telecommunication, preferably further add Cyclic Prefix and string conversion.
Described optical receiver comprises: optic tunable filter TOF and photoelectric detector PD, wherein: in photoelectric detector PD, be provided with the digital signal processing chip of carrying out fast Fourier transform FFT, computing flow process is contrary with described OFDM chip array.
Described modulation mechanism adopts but is not limited to MZ Mach-Zehnder MZM, and this modulator is transformed into the OFDM signal of telecommunication in the optical wavelength of light carrier generating mechanism output, obtains linear electric light conversion thereby this MZ Mach-Zehnder MZM is biased in orthogonal points.
Technique effect
Compared with prior art, the technology of the present invention effect comprises:
1) by adopting the technology of hierarchical modulation, effectively promoted the spectrum efficiency of system.
2) in transmission total amount of data constant in the situation that, thereby reduce the energy consumption of whole system by the carrier number that adopts hierarchical modulation technology can minimizing system to need.
3) need to have wavelength-selective switches flexibly at each Nodes, the process of hierarchical modulation all can complete at central station simultaneously, and can realize above-mentioned function by software view, greatly reduces the complexity of system.
Brief description of the drawings
Figure 1 ?two signals of a adopt QPSK/16 ?the mapping schematic diagram of hierarchical modulation of QAM;
Figure 1 ?the b schematic network structure that is embodiment;
Figure 1 ?the principle schematic of the c lifting spectrum efficiency that is embodiment;
Figure 1 ?the d application conditions schematic diagram that is embodiment;
Fig. 2 is the schematic diagram of embodiment;
In figure: laser CW, Polarization Controller PC, erbium-doped optical fiber amplifier EDFA, adjustable optical attenuator VOA, MZ Mach-Zehnder MZM, optic tunable filter TOF, photoelectric detector PD, for detection of the spectrometer OSNR of Optical Signal To Noise Ratio in band.
Fig. 3 is the experimental result schematic diagram of embodiment;
In figure: (a) being the OSNR performance schematic diagram of Nodes, is (b) the error performance schematic diagram under different OSNR performances.
Embodiment
Below embodiments of the invention are elaborated, the present embodiment is implemented under taking technical solution of the present invention as prerequisite, be detailed execution mode and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
Embodiment 1
As figure 1 ?as shown in a, for the principle of hierarchical modulation, the QPSK/16 that the present embodiment adopts ?the mapping of two-layer data hierarchy modulation of QAM, in an embodiment by by two kinds of data-mappings on different QPSK planispheres, and then jointly formed 16 ?the planisphere of QAM.Definition α=d1/d2 is hierarchical modulation parameter, from figure, can it is evident that by regulating α can control the difference of priority between two layer data, in the situation that power is certain, in the time that α increases the signal of ground floor due to constellation symbols apart from increase and transmission performance promote to some extent; Corresponding the reducing of the signal constellation (in digital modulation) schematic symbol of second layer distance, thereby transmission performance simultaneously decreases, and in actual application, is greater than 2 for the different hierarchical modulation parameter alpha of transmission performance of two layer data should be met.
As figure 1 ?as shown in b, be the network topology structure specifically providing, light signal from node A through Node B, C, D, then E arrives F.Because signal can be decayed and then be exaggerated between each node, introduce the amplification noise of spontaneous radiation (ASE), therefore, when each node adopts same network configuration, the OSNR that signal is transferred to node signal below from A can reduce gradually.
For figure 1 ?shown in c, resource allocation conditions when being transferred to Node B and E for signal from node A.The situation that adopts different patterns to distribute for signal in the figure of the left side, because signal only need to be through a span line from A to B, therefore signal OSNR high can support high-order 16 ?QAM pattern, otherwise signal need to pass through multiple span lines from A to E, therefore the OSNR of signal reduces, thereby can only support the QPSK pattern of low order, two nodes also have OSNR redundancy partly simultaneously.Suppose that it is respectively R that 16 ?QAM and QPSK signal obtain without the needed OSNR of transmission of error code
16 ?QAMand R
qPSK, the OSNR performance of Node B and node E is respectively OSNR
band OSNR
e.This time, Node B and E also had respectively OSNR
b-R
16-QAMand OSNR
e-R
qPSKoSNR redundancy.By hierarchical modulation technology, by the subcarrier of distributing to node E adopt layering QPSK/16 ?QAM modulation format, wherein the QPSK signal of ground floor carries the data that are sent to node E, simultaneously the QPSK signal of the second layer is carried to the data of Node B.Owing to having introduced hierarchical modulation technology, the OSNR demand of signal is different two-layer, and the OSNR demand of ground floor reduces, otherwise the OSNR demand of the second layer raises.Because two Nodes have respectively corresponding OSNR redundancy, therefore two signals obtain respectively the performance without error code at node separately.
As figure 1 ?as shown in du, for promoting the condition of signal from a node to other two node aggregate date rate, when signal in the time that node A is transferred to Node B, can adopt 16 ?QAM modulation format, when signal can adopt QPSK modulation format in the time that node A is transferred to node E, the while, two nodes had the OSNR of a small amount of redundancy simultaneously.By hierarchical modulation, the signal that is sent to Node B is superimposed upon on the subcarrier that is sent to node E, obtain hierarchical modulation QPSK/16 ?QAM modulation.R
1st ?Layerand R
2nd ?Layerbe respectively the first sublevel and second layer signal and obtain the OSNR demand without error performance.When system meets R
16 ?QAM>OSNR
e>R
1st ?Layerand OSNR
b>R
2nd ?Layertime, the signal after stack can obtain the performance without error code in Node B and original signal at node E.When signal from A to B and the effective bandwidth of E be all f
0identical time, adopt the total amount of data of hierarchical modulation technology front and back to be respectively 4f
0+ 2f
0=6f
0and 4f
0+ 4f
0=8f
0.Therefore in the situation that bandwidth is constant, spectrum efficiency has promoted (8f0 ?6f0)/6f0 ≈ 33.3%.
As shown in Figure 2, for the present embodiment 1 implement device, comprise: light carrier generating mechanism, modulation mechanism, optical receiver and several between modulation mechanism and optical receiver are by adjustable optical attenuator VOA, the span line in parallel of erbium-doped optical fiber amplifier EDFA and/or optical fiber composition, wherein: data to be sent are mapped to by OFDM digital signal processor structure on each subcarrier of OFDM, modulation mechanism is modulated to ofdm signal each subcarrier of light carrier generating mechanism output, be on optical channel, light signal is through each different span line, at each receiving node place, light signal being input to photoelectric detector PD receives to detect and gather and obtains the ofdm signal that each receiving node is corresponding.
In described span line in parallel, after the modulation of each transmitting node output, signal is received by arbitrary receiving node, the concrete wavelength-selective switches by each Nodes is derived corresponding wavelength, has then realized the overall resource distribution of system by the unified distribution of central station.
Described light carrier generating mechanism adopts but is not limited to laser, is preferably the laser of the light carrier that can launch narrow linewidth, produces corresponding wavelength, for the modulation of light signal at transmission node end.
The described built-in OFDM chip array of OFDM digital signal processor structure, the data to be sent that serial entered by anti-fast Fourier transform IFFT are converted into the OFDM signal of telecommunication, preferably further add Cyclic Prefix and string conversion.
Described optical receiver comprises: optic tunable filter TOF and photoelectric detector PD, wherein: in photoelectric detector PD, be provided with the digital signal processing chip of carrying out fast Fourier transform FFT, computing flow process is contrary with described OFDM chip array.
Described optical fiber refers to: length is standard single-mode fiber more than 50km, and its loss attenuation coefficient is 0.2dB/km.
Described modulation mechanism adopts but is not limited to MZ Mach-Zehnder MZM, and this modulator is transformed into the OFDM signal of telecommunication in the optical wavelength of light carrier generating mechanism output, obtains linear electric light conversion thereby this MZ Mach-Zehnder MZM is biased in orthogonal points.
The light signal of supposing node A in Fig. 2 sends by the signal of OFDM hierarchical modulation and modulates from laser, then signal is exaggerated, pass through respectively multistage optical fiber link, obtain the OSNR performance of each node by the decay formula of the performance junction link OSNR of one section of link, thereby can draw the OSNR performance of each node in Fig. 3 (a).The QPSK/16 that light signal embodiment adopts ?the 2 layers of different QPSK signal combination of amplitude that are mapped with of 2 layer data hierarchical modulation of QAM form, two groups of data are encoded by OFDM and shone upon makes data on the different layers of each subcarrier of OFDM.The light carrier that light source sends enters Polarization Controller PC, then by MZM by Signal Regulation to light carrier, signal passes through multiple span lines again, finally obtains corresponding signal at receiving terminal.At each receiving node place, sampling and the reprocessing of the signal receiving being carried out to data obtain corresponding data, and compare with original data, obtain the corresponding error rate.
As shown in Figure 3, the error performance under different OSNR for the OSNR performance of each node and every kind of pattern.Obtain the OSNR performance of each Nodes by measuring the OSNR of each Nodes signal, as shown in Fig. 3 (a).The method of simultaneously introducing ASE noise by EDFA in the dotted line in Fig. 2 obtains corresponding different pattern and the error performance of hierarchical modulation two layer signals under different OSNR performances, thereby obtains Fig. 3 (b).By observing Fig. 3 (a) and 3 (b), can obtain R
16 ?QAM>OSNR
e>R
1st ?Layerand OSNR
b>R
2nd ?Layer.Therefore can pass through hierarchical modulation technology, signal is superimposed and carries out the transmission without error code, therefore the signal after stack can obtain the performance without error code in Node B and original signal at node E.
Claims (10)
1. the optical network system spectrum efficiency optimization method based on hierarchical modulation, it is characterized in that, by at least two different serial datas are mapped to corresponding point on the planisphere of high-order pattern with crossing hierarchical modulation, by regulating planisphere that the performance of each data and the transmission characteristic of serial data are traded off, and then make data more than two carry out the reception without error code at corresponding node receiving terminal simultaneously, thereby realize the raising of the transmission aggregate date rate of signal, in the situation that bandwidth is constant, promoted the spectrum efficiency of system.
2. method according to claim 1, is characterized in that, changes the pattern of each sublayer in hierarchical modulation, thereby obtain being more suitable for the layered modulation constellation figure of transmission in described hierarchical modulation for different data types and data volume correspondence.
3. method according to claim 1 and 2, it is characterized in that, the mapping of described hierarchical modulation refers to: will be sent to the poor signal of node OSNR and be superimposed with another one and be sent to the data of the node of OSNR better performances, so latter two signal matches and is mapped on the different layers of hierarchical modulation.
4. realize the device of method described in above-mentioned arbitrary claim for one kind, it is characterized in that, comprise: light carrier generating mechanism, modulation mechanism, optical receiver and several between modulation mechanism and optical receiver are by adjustable optical attenuator VOA, the span line in parallel of erbium-doped optical fiber amplifier EDFA and/or optical fiber composition, wherein: data to be sent are mapped to by OFDM digital signal processor structure on each subcarrier of OFDM, modulation mechanism is modulated to ofdm signal each subcarrier of light carrier generating mechanism output, be on optical channel, light signal is through each different span line, at each receiving node place, light signal being input to photoelectric detector PD receives to detect and gather and obtains the ofdm signal that each receiving node is corresponding.
5. device according to claim 4, it is characterized in that, in described span line in parallel, after the modulation of each transmitting node output, signal is received by arbitrary receiving node, the concrete wavelength-selective switches by each Nodes is derived corresponding wavelength, has then realized the overall resource of system by the unified distribution of central station.
6. device according to claim 4, is characterized in that, described light carrier generating mechanism adopts the laser of the light carrier that can launch narrow linewidth, produces corresponding wavelength, for the modulation of light signal at transmission node end.
7. device according to claim 4, it is characterized in that, the described built-in OFDM chip array of OFDM digital signal processor structure, the data to be sent that serial entered by anti-fast Fourier transform IFFT are converted into the OFDM signal of telecommunication, preferably further add Cyclic Prefix and string conversion.
8. device according to claim 4, it is characterized in that, described optical receiver comprises: optic tunable filter TOF and photoelectric detector PD, wherein: in photoelectric detector PD, be provided with the digital signal processing chip of carrying out fast Fourier transform FFT, computing flow process is contrary with described OFDM chip array.
9. device according to claim 4, is characterized in that, described optical fiber refers to: length is standard single-mode fiber more than 50km, and its loss attenuation coefficient is 0.2dB/km.
10. device according to claim 4, it is characterized in that, described modulation mechanism adopts MZ Mach-Zehnder MZM, this modulator is transformed into the OFDM signal of telecommunication in the optical wavelength of light carrier generating mechanism output, obtains linear electric light conversion thereby this MZ Mach-Zehnder MZM is biased in orthogonal points.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105721063A (en) * | 2016-02-24 | 2016-06-29 | 烽火通信科技股份有限公司 | Optical carrier communication method and system based on VOA modulation |
| CN106230506A (en) * | 2016-07-19 | 2016-12-14 | 中国科学技术大学 | A kind of orthogonal frequency-division complex modulation method being applied to visible light communication |
| WO2016197891A1 (en) * | 2015-06-11 | 2016-12-15 | Huawei Technologies Co., Ltd. | System and method for designing constellations and use thereof |
| CN107666351A (en) * | 2017-09-30 | 2018-02-06 | 长春理工大学 | Using super continuous spectrums carrier source communication system |
| CN108141441A (en) * | 2015-09-03 | 2018-06-08 | 舒尔获得控股公司 | Multiresolution decodes and modulating system |
| CN109889275A (en) * | 2019-03-28 | 2019-06-14 | 兰州理工大学 | A kind of layering light modulating method being suitable for Turbulence Channels |
| CN111989873A (en) * | 2018-04-13 | 2020-11-24 | 思科技术公司 | Automatic bandwidth optimization for optical networks |
| CN113824526A (en) * | 2021-11-22 | 2021-12-21 | 北京邮电大学 | Flexible optical interconnection method for optical mark top adjustment |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101465829A (en) * | 2007-12-21 | 2009-06-24 | 华为技术有限公司 | Method and apparatus for transmitting and receiving layered modulation data |
| US20130034049A1 (en) * | 2006-12-30 | 2013-02-07 | Apple Inc. | Modulation Division Multiple Access |
-
2014
- 2014-06-26 CN CN201410294279.9A patent/CN104079357A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130034049A1 (en) * | 2006-12-30 | 2013-02-07 | Apple Inc. | Modulation Division Multiple Access |
| CN101465829A (en) * | 2007-12-21 | 2009-06-24 | 华为技术有限公司 | Method and apparatus for transmitting and receiving layered modulation data |
Non-Patent Citations (1)
| Title |
|---|
| PAN CAO等: "Power margin improvement for OFDMA-PON using hierarchical modulation", 《OPTICS EXPRESS》 * |
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| WO2016197891A1 (en) * | 2015-06-11 | 2016-12-15 | Huawei Technologies Co., Ltd. | System and method for designing constellations and use thereof |
| US9768911B2 (en) | 2015-06-11 | 2017-09-19 | Huawei Technologies Co., Ltd. | System and method for designing constellations and use thereof |
| CN108141441A (en) * | 2015-09-03 | 2018-06-08 | 舒尔获得控股公司 | Multiresolution decodes and modulating system |
| CN108141441B (en) * | 2015-09-03 | 2021-02-12 | 舒尔获得控股公司 | Multi-resolution decoding and modulating system |
| CN105721063B (en) * | 2016-02-24 | 2018-04-20 | 烽火通信科技股份有限公司 | A kind of the light carrier means of communication and system based on VOA modulation |
| CN105721063A (en) * | 2016-02-24 | 2016-06-29 | 烽火通信科技股份有限公司 | Optical carrier communication method and system based on VOA modulation |
| CN106230506A (en) * | 2016-07-19 | 2016-12-14 | 中国科学技术大学 | A kind of orthogonal frequency-division complex modulation method being applied to visible light communication |
| CN107666351A (en) * | 2017-09-30 | 2018-02-06 | 长春理工大学 | Using super continuous spectrums carrier source communication system |
| CN107666351B (en) * | 2017-09-30 | 2019-10-15 | 长春理工大学 | Using super continuous spectrums carrier source communication system |
| CN111989873A (en) * | 2018-04-13 | 2020-11-24 | 思科技术公司 | Automatic bandwidth optimization for optical networks |
| CN111989873B (en) * | 2018-04-13 | 2023-07-18 | 思科技术公司 | Automatic bandwidth optimization for optical networks |
| CN109889275A (en) * | 2019-03-28 | 2019-06-14 | 兰州理工大学 | A kind of layering light modulating method being suitable for Turbulence Channels |
| CN109889275B (en) * | 2019-03-28 | 2021-09-24 | 兰州理工大学 | Layered optical space modulation method suitable for turbulent flow channel |
| CN113824526A (en) * | 2021-11-22 | 2021-12-21 | 北京邮电大学 | Flexible optical interconnection method for optical mark top adjustment |
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Application publication date: 20141001 |