In this paper, we have evaluated a bidirectional wavelength division multiplexing passive optical network(WDM-PON) employing intensity modulated/direct detection optical orthogonal frequency division multiplexing(IM/D...In this paper, we have evaluated a bidirectional wavelength division multiplexing passive optical network(WDM-PON) employing intensity modulated/direct detection optical orthogonal frequency division multiplexing(IM/DD-OFDM). The proposed system employs 100 Gbit/s 16 quadrature amplitude modulation(16-QAM) downstream and 5 Gbit/s on-off keying(OOK) upstream wavelengths, respectively. The proposed system is considered low-cost as non-coherent IM/DD OFDM technology and a simple reflective semiconductor optical amplifier(RSOA) colorless transmitter are employed and no dispersion compensating fiber(DCF) is needed. Based on the bit error rate(BER) results of WDM signals, the proposed WDM-PON system can achieve up to 1.6 Tbit/s(100 Gbit/s/λ × 16 wavelengths) downstream transmission over a 30 km single mode fiber(SMF).展开更多
We experimentally demonstrate the transmission of discrete multi-tone(DMT)millimeter-wave(mm-wave)signals over a 1.2-km distance at the D-band(110–170 GHz)in a cost-effective intensity-modulation and direct-detection...We experimentally demonstrate the transmission of discrete multi-tone(DMT)millimeter-wave(mm-wave)signals over a 1.2-km distance at the D-band(110–170 GHz)in a cost-effective intensity-modulation and direct-detection(IM/DD)communication system.In the experiment,we successfully achieve the transmission of DMT-QPSK and DMT-16QAM mm-wave signals over multiple-input multiple-output(MIMO)links.After the 1.2-km free-space transmission,the bit error rate(BER)of the DMT-16QAM is below the 25%soft decision forward error correction(25%SD-FEC)threshold of 4×10^(-2),with a maximum net bit rate of 24.62 Gbit/s achieved in this system.展开更多
Multi-mode fiber(MMF)links are expected to greatly enhance capacity to cope with rapidly increasing data traffic in optical short-reach systems and networks.Recently,mode division multiplexing(MDM)over MMF has been pr...Multi-mode fiber(MMF)links are expected to greatly enhance capacity to cope with rapidly increasing data traffic in optical short-reach systems and networks.Recently,mode division multiplexing(MDM)over MMF has been proposed,in which different modes in MMF are utilized as spatial channels for data transmission.Stronglycoupled MDM techniques utilizing coherent detection and multiplex-input-multiplex-output(MIMO)digital signal processing(DSP)are complex and expensive for shortreach transmission.So the weakly-coupled approach by significantly suppressing mode coupling in the fiber and optical components has been proposed.In this way,the signals in each mode can be independently transmitted and received using conventional intensity modulation and direct detection(IM-DD).In this paper,we elaborate the key technologies to realize weakly-coupled MDM transmission over conventional MMF,including mode characteristic in MMF and weakly-coupled mode multiplexer/ demultiplexer(MUX/DEMUX).We also present the upto-date experimental results for weakly-coupled MDM transmission over conventional OM3 MMF.We show that weakly-coupled MDM scheme is promising for high-speed optical interconnections and bandwidth upgrade of already-deployed MMF links.展开更多
In this paper,we propose an EADO-OFDM(Enhanced Asymmetrically Clipped DC Biased Optical Orthogonal Frequency Division Multiplexing)method for IM/DD(Intensity-Modulated DirectDetection)optical systems,in which the AV-D...In this paper,we propose an EADO-OFDM(Enhanced Asymmetrically Clipped DC Biased Optical Orthogonal Frequency Division Multiplexing)method for IM/DD(Intensity-Modulated DirectDetection)optical systems,in which the AV-DCO-OFDM(Absolute Valued DC Biased Optical OFDM)symbols on the even subcarriers and ACO-OFDM(Asymmetrically Clipped Optical OFDM)symbols on the odd subcarriers are combined for simultaneous transmission.Moreover,we discuss the PDF(Probability Density Function)and electrical SNR(Signal to Noise Ratio)of the symbols,which are utilized to estimate the BER(Bit Error Ratio)performance and overall performance of EADO-OFDM.The Monte Carlo simulation results have validated the theoretical analysis and have also confirmed the EADO-OFDM is attractive considering the following benefits.Firstly,EADO-OFDM is more energy efficient compared to the power-efficient DCO-OFDM(DC Biased Optical OFDM),since the required DC bias is smaller when appropriate constellation size combinations are chosen.In addition,EADO-OFDM performs better than the conventional ADO-OFDM(Asymmetrically Clipped DC Biased Optical OFDM),because the absolute value operation causes no clipping distortion.展开更多
基于静态流量模式设计的强度调制和直接检测(Intensity Modulation and Direct Detection,IMDD)无源光网络(Passive Optical Networks,PON),无法有效满足新兴业务在带宽、时延和连通性方面的多样化需求。针对这一问题,提出了一种基于级...基于静态流量模式设计的强度调制和直接检测(Intensity Modulation and Direct Detection,IMDD)无源光网络(Passive Optical Networks,PON),无法有效满足新兴业务在带宽、时延和连通性方面的多样化需求。针对这一问题,提出了一种基于级联快速傅里叶逆变换/快速傅里叶变换(Inverse Fast Fourier Transform/Fast Fourier Transform,IFFT/FFT)的点对多点(Point-to-Multipoint,P2MP)光收发机,并在上行IMDD PON系统中进行了实验验证。为了进一步研究该收发机对不同应用场景的适用性,利用上行IMDD PON仿真系统,确定了数字滤波器长度、入纤光功率等最优参数,对该收发机的上行传输性能和灵活性进行了分析。仿真结果表明:在光纤信道衰落不大的情况下,光纤传输距离可以灵活变化,不会明显降低系统传输容量。当信道数≤10时,每个光网络单元(Optical Network Unit,ONU),可以灵活地改变其聚合的信道数,不会显著降低系统传输容量。此外,通过动态改变每个ONU的比特率,灵活地改变其ONU发射功率的动态范围。展开更多
An adaptive dispersion estimation(ADE)is proposed to compensate dispersion and estimate the transfer function of the fiber channel with GerchbergSaxton(G-S)algorithm,using the stochastic gradient descent(SGD)method in...An adaptive dispersion estimation(ADE)is proposed to compensate dispersion and estimate the transfer function of the fiber channel with GerchbergSaxton(G-S)algorithm,using the stochastic gradient descent(SGD)method in the intensity-modulation and direct-detection(IM-DD)system,improving the tolerance of the algorithm to chromatic dispersion(CD).In order to address the divergence arising from the perturbation in the amplitude of the received signal caused by the filtering effect of the non-ideal channels,a channel-compensation equalizer(CCE)derived from the back-to-back(BTB)scenario is employed at the transmitter to make the amplitude of the received signal depicting the CD effect more accurately.The simulation results demonstrate the essentiality of CCE for the convergence and performance improvement of the G-S algorithm.Results show that it supports 112Gb/s four-level pulse amplitude modulation(PAM4)over 100 km standard single-mode fiber(SSMF)transmission under the 7%forward error correction(FEC)threshold of 3.8E-3.Besides,ADE improves the tolerance to wavelength drift from about 4 nm to 42 nm,and there is a better tolerance for fiber distance perturbation,indicating the G-S algorithm and its derived algorithms with the ADE scheme exhibit superior robustness to the perturbation in the system.展开更多
针对强度调制和直接检测(IM-DD)短距光传输系统中,由于光器件带宽受限特性,导致接收端检测到的PAM4信号存在较大符号间干扰(inter symbol interference,ISI),给出了一种基于判决反馈均衡器(DFE)级联超奈奎斯特速率(FTN)传输的带宽受限...针对强度调制和直接检测(IM-DD)短距光传输系统中,由于光器件带宽受限特性,导致接收端检测到的PAM4信号存在较大符号间干扰(inter symbol interference,ISI),给出了一种基于判决反馈均衡器(DFE)级联超奈奎斯特速率(FTN)传输的带宽受限下的补偿方案,并在不同的带宽受限场景下进行了仿真验证。仿真结果表明,该带宽受限补偿方案能够有效地恢复接收到的PAM4信号,在误码率低于10-3时,有1 d B左右的性能收益。展开更多
A general formula for the dispersion limit of single-mode-fiber IM/DD (Intensity Modulation /Direct Detection) systems is derived for arbitrary given normalized pulse width P, eye opening penalty X and source linewidt...A general formula for the dispersion limit of single-mode-fiber IM/DD (Intensity Modulation /Direct Detection) systems is derived for arbitrary given normalized pulse width P, eye opening penalty X and source linewidth enchancement factor α. From the comparison with published theoretical results, computer simulation and experimental data, its validity and convenience in system design and evaluation are shown. Using this simple and general formula, one can easily obtain the dispersion limit of various fiber types under different working conditions in IM/DD systems.展开更多
点对多点(Point-to-Multipoint,P2MP)光收发机,使不同位置的多个低速光收发机同时与集中或分布在网络中心局的几个高速光收发机通信,为5G-Advanced网络提供了一种高效的解决方案。针对基于级联快速傅里叶逆变换(Inverse Fast Fourier Tr...点对多点(Point-to-Multipoint,P2MP)光收发机,使不同位置的多个低速光收发机同时与集中或分布在网络中心局的几个高速光收发机通信,为5G-Advanced网络提供了一种高效的解决方案。针对基于级联快速傅里叶逆变换(Inverse Fast Fourier Transform,IFFT)/傅里叶变换(Fast Fourier Transform,FFT)多信道聚合/解聚合技术,深入研究了P2MP光收发机在上行强度调制直接检测(Intensity Modulation and Direct Detection,IMDD)无源光网络(Passive Optical Network,PON)中的可扩展性。仿真结果表明:每个光网络单元(Optical Network Unit,ONU)可以自适应地改变其聚合的信道数目,而不会明显降低系统传输容量和ONU发射功率动态范围;ONU数目的增加也可以通过略微降低传输容量和ONU发射功率动态范围来有效实现。因此,该P2MP光收发机为PON提供了良好的可扩展性。展开更多
随着云业务、视频业务和移动互联业务的快速发展,5G光接入网对于传输容量的需求日益迫切。接入网段日益增长的带宽需求不仅要求更高的传输速度,还需要保持较低的系统成本。但是成熟的商用低成本光电器件的带宽通常是有限的,当传输速率...随着云业务、视频业务和移动互联业务的快速发展,5G光接入网对于传输容量的需求日益迫切。接入网段日益增长的带宽需求不仅要求更高的传输速度,还需要保持较低的系统成本。但是成熟的商用低成本光电器件的带宽通常是有限的,当传输速率很高时,带宽明显小于信号的波特率。考虑到低成本光学器件的有限带宽,采用具有高频谱效率的先进调制格式,如PAM,CAP以及DMT是很有潜力的选择。主要针对光接入网器件带宽受限的问题,在带宽受限的100 G无源光网络中,仿真对比了三种先进调制格式的性能,分析了三种调制格式传输20 km SSMF后的接收灵敏度和功率预算,还讨论了他们的热噪声性能和抗色散性能。展开更多
基金supported by the Erciyes University Scientific Research Projects Coordination Unit (No.FDK-2019-8750)。
文摘In this paper, we have evaluated a bidirectional wavelength division multiplexing passive optical network(WDM-PON) employing intensity modulated/direct detection optical orthogonal frequency division multiplexing(IM/DD-OFDM). The proposed system employs 100 Gbit/s 16 quadrature amplitude modulation(16-QAM) downstream and 5 Gbit/s on-off keying(OOK) upstream wavelengths, respectively. The proposed system is considered low-cost as non-coherent IM/DD OFDM technology and a simple reflective semiconductor optical amplifier(RSOA) colorless transmitter are employed and no dispersion compensating fiber(DCF) is needed. Based on the bit error rate(BER) results of WDM signals, the proposed WDM-PON system can achieve up to 1.6 Tbit/s(100 Gbit/s/λ × 16 wavelengths) downstream transmission over a 30 km single mode fiber(SMF).
基金supported by the National Key R&D Program of China(No.2023YFB2905600)the National Natural Science Foundation of China(Nos.61935005,62127802,62331004,62305067)the Key Project of Jiangsu Province of China(No.BE2023001-4)。
文摘We experimentally demonstrate the transmission of discrete multi-tone(DMT)millimeter-wave(mm-wave)signals over a 1.2-km distance at the D-band(110–170 GHz)in a cost-effective intensity-modulation and direct-detection(IM/DD)communication system.In the experiment,we successfully achieve the transmission of DMT-QPSK and DMT-16QAM mm-wave signals over multiple-input multiple-output(MIMO)links.After the 1.2-km free-space transmission,the bit error rate(BER)of the DMT-16QAM is below the 25%soft decision forward error correction(25%SD-FEC)threshold of 4×10^(-2),with a maximum net bit rate of 24.62 Gbit/s achieved in this system.
基金the National Natural Science Foundation of China(Grant Nos.61771024,61627814,61505002,61690194 and 61605004)Fundamental Research Project of Shenzhen Science and Technology Foundation(Nos.JCYJ 20170412153729436 and 20170307172513653).
文摘Multi-mode fiber(MMF)links are expected to greatly enhance capacity to cope with rapidly increasing data traffic in optical short-reach systems and networks.Recently,mode division multiplexing(MDM)over MMF has been proposed,in which different modes in MMF are utilized as spatial channels for data transmission.Stronglycoupled MDM techniques utilizing coherent detection and multiplex-input-multiplex-output(MIMO)digital signal processing(DSP)are complex and expensive for shortreach transmission.So the weakly-coupled approach by significantly suppressing mode coupling in the fiber and optical components has been proposed.In this way,the signals in each mode can be independently transmitted and received using conventional intensity modulation and direct detection(IM-DD).In this paper,we elaborate the key technologies to realize weakly-coupled MDM transmission over conventional MMF,including mode characteristic in MMF and weakly-coupled mode multiplexer/ demultiplexer(MUX/DEMUX).We also present the upto-date experimental results for weakly-coupled MDM transmission over conventional OM3 MMF.We show that weakly-coupled MDM scheme is promising for high-speed optical interconnections and bandwidth upgrade of already-deployed MMF links.
基金supported in part by National Key Basic Research Program of China(No.2013CB329200)in part by Shenzhen Subject Arrangements(No.JCYJ20160331184124954)+4 种基金in part by Shenzhen Peacock Plan(No.1108170036003286)in part by Guangdong Science and Technology Planning Project(No.2014B010120001)in part by Shenzhen Fundamental Research Project(No.JCYJ20150401112337177)in part by Shenzhen Visible Light Communication System Key Laboratory(No.ZDSYS20140512114229398)in part by EPSRC Funded Projects(EP/N004558/1,EP/N023862/1).
文摘In this paper,we propose an EADO-OFDM(Enhanced Asymmetrically Clipped DC Biased Optical Orthogonal Frequency Division Multiplexing)method for IM/DD(Intensity-Modulated DirectDetection)optical systems,in which the AV-DCO-OFDM(Absolute Valued DC Biased Optical OFDM)symbols on the even subcarriers and ACO-OFDM(Asymmetrically Clipped Optical OFDM)symbols on the odd subcarriers are combined for simultaneous transmission.Moreover,we discuss the PDF(Probability Density Function)and electrical SNR(Signal to Noise Ratio)of the symbols,which are utilized to estimate the BER(Bit Error Ratio)performance and overall performance of EADO-OFDM.The Monte Carlo simulation results have validated the theoretical analysis and have also confirmed the EADO-OFDM is attractive considering the following benefits.Firstly,EADO-OFDM is more energy efficient compared to the power-efficient DCO-OFDM(DC Biased Optical OFDM),since the required DC bias is smaller when appropriate constellation size combinations are chosen.In addition,EADO-OFDM performs better than the conventional ADO-OFDM(Asymmetrically Clipped DC Biased Optical OFDM),because the absolute value operation causes no clipping distortion.
基金funded by the National Natural Science Foundation of China NSFC,U22A2005 and 62201033theYoung Elite Scientists Sponsorship Program of CIC 2021QNRC001。
文摘An adaptive dispersion estimation(ADE)is proposed to compensate dispersion and estimate the transfer function of the fiber channel with GerchbergSaxton(G-S)algorithm,using the stochastic gradient descent(SGD)method in the intensity-modulation and direct-detection(IM-DD)system,improving the tolerance of the algorithm to chromatic dispersion(CD).In order to address the divergence arising from the perturbation in the amplitude of the received signal caused by the filtering effect of the non-ideal channels,a channel-compensation equalizer(CCE)derived from the back-to-back(BTB)scenario is employed at the transmitter to make the amplitude of the received signal depicting the CD effect more accurately.The simulation results demonstrate the essentiality of CCE for the convergence and performance improvement of the G-S algorithm.Results show that it supports 112Gb/s four-level pulse amplitude modulation(PAM4)over 100 km standard single-mode fiber(SSMF)transmission under the 7%forward error correction(FEC)threshold of 3.8E-3.Besides,ADE improves the tolerance to wavelength drift from about 4 nm to 42 nm,and there is a better tolerance for fiber distance perturbation,indicating the G-S algorithm and its derived algorithms with the ADE scheme exhibit superior robustness to the perturbation in the system.
文摘针对强度调制和直接检测(IM-DD)短距光传输系统中,由于光器件带宽受限特性,导致接收端检测到的PAM4信号存在较大符号间干扰(inter symbol interference,ISI),给出了一种基于判决反馈均衡器(DFE)级联超奈奎斯特速率(FTN)传输的带宽受限下的补偿方案,并在不同的带宽受限场景下进行了仿真验证。仿真结果表明,该带宽受限补偿方案能够有效地恢复接收到的PAM4信号,在误码率低于10-3时,有1 d B左右的性能收益。
基金the High Technology Research and Development Programme of China
文摘A general formula for the dispersion limit of single-mode-fiber IM/DD (Intensity Modulation /Direct Detection) systems is derived for arbitrary given normalized pulse width P, eye opening penalty X and source linewidth enchancement factor α. From the comparison with published theoretical results, computer simulation and experimental data, its validity and convenience in system design and evaluation are shown. Using this simple and general formula, one can easily obtain the dispersion limit of various fiber types under different working conditions in IM/DD systems.
文摘点对多点(Point-to-Multipoint,P2MP)光收发机,使不同位置的多个低速光收发机同时与集中或分布在网络中心局的几个高速光收发机通信,为5G-Advanced网络提供了一种高效的解决方案。针对基于级联快速傅里叶逆变换(Inverse Fast Fourier Transform,IFFT)/傅里叶变换(Fast Fourier Transform,FFT)多信道聚合/解聚合技术,深入研究了P2MP光收发机在上行强度调制直接检测(Intensity Modulation and Direct Detection,IMDD)无源光网络(Passive Optical Network,PON)中的可扩展性。仿真结果表明:每个光网络单元(Optical Network Unit,ONU)可以自适应地改变其聚合的信道数目,而不会明显降低系统传输容量和ONU发射功率动态范围;ONU数目的增加也可以通过略微降低传输容量和ONU发射功率动态范围来有效实现。因此,该P2MP光收发机为PON提供了良好的可扩展性。
文摘随着云业务、视频业务和移动互联业务的快速发展,5G光接入网对于传输容量的需求日益迫切。接入网段日益增长的带宽需求不仅要求更高的传输速度,还需要保持较低的系统成本。但是成熟的商用低成本光电器件的带宽通常是有限的,当传输速率很高时,带宽明显小于信号的波特率。考虑到低成本光学器件的有限带宽,采用具有高频谱效率的先进调制格式,如PAM,CAP以及DMT是很有潜力的选择。主要针对光接入网器件带宽受限的问题,在带宽受限的100 G无源光网络中,仿真对比了三种先进调制格式的性能,分析了三种调制格式传输20 km SSMF后的接收灵敏度和功率预算,还讨论了他们的热噪声性能和抗色散性能。
