对相干光正交频分复用(orthogonal frequency division multiplexing,OFDM)在大容量和超长距离光传输中的应用进行了综合性的阐述.首先,简单地描述了OFDM信号的原理,并对OFDM在光通信中的优势及劣势作了全面的分析.其次,对兆兆比特每秒(...对相干光正交频分复用(orthogonal frequency division multiplexing,OFDM)在大容量和超长距离光传输中的应用进行了综合性的阐述.首先,简单地描述了OFDM信号的原理,并对OFDM在光通信中的优势及劣势作了全面的分析.其次,对兆兆比特每秒(Tb/s)级OFDM的发射机、链路及接收机的设计进行了详细的描述,并介绍了迄今为止世界范围内已完成的具有里程碑意义的OFDM超大容量、超长距离光传输实验.最后,对Tb/s级光传输的发展进行了展望.展开更多
In this paper, we investigate advanced digital signal process ing （DSP） at the transmitter and receiver side for signal pre equalization and postequalization in order to improve spec trum efficiency （SE） and trans...In this paper, we investigate advanced digital signal process ing （DSP） at the transmitter and receiver side for signal pre equalization and postequalization in order to improve spec trum efficiency （SE） and transmission distance in an optical access network. A novel DSP scheme for this optical super Nyquist filtering 9 Quadrature Amplitude Modulation （9 QAM） like signals based on muhimodulus equalization with out post filtering is proposed. This scheme recovers the Ny quist filtered Quadrature PhaseShift Keying （QPSK） signal to a 9QAMlike one. With this technique, SE can be increased to 4 b/s/Hz for QPSK signals. A novel digital superNyquist signal generation scheme is also proposed to further suppress the Nyquist signal bandwidth and reduce channel crosstalk without the need for optical prefiltering. Only optical cou plers are needed for superNyquist wavelengthdivisionmulti plexing （WDM） channel multiplexing. We extend the DSP for shorthaul optical transmission networks by using highorder QAMs. We propose a highspeed Can＇ierless Amplitude/Phase 64 QAM （CAP64 QAM） system using directly modulated la ser （DML） based on direct detection and digital equalization. Decisiondirected least mean square is used to equalize the CAP64QAM. Using this scheme, we generate and transmit up to 60 Gbit/s CAP64QAM over 20 km standard single mode fiber based on the DML and direct detection. Finally, several key problems are solved for real time orthogonalfre quencydivisionmultiplexing （OFDM） signal transmission aml processing. With coherent detection, up to 100 Glfit/s 16 QAMOFDM realtime transmission is possible.展开更多
A brief overview of recent experimental research on coherent optical fiber transmission systems at Queen＇s University is presented. Exemplary results are described that exploit real-time signal processing to assess t...A brief overview of recent experimental research on coherent optical fiber transmission systems at Queen＇s University is presented. Exemplary results are described that exploit real-time signal processing to assess the impact of cascaded optical filtering.展开更多
文摘对相干光正交频分复用(orthogonal frequency division multiplexing,OFDM)在大容量和超长距离光传输中的应用进行了综合性的阐述.首先,简单地描述了OFDM信号的原理,并对OFDM在光通信中的优势及劣势作了全面的分析.其次,对兆兆比特每秒(Tb/s)级OFDM的发射机、链路及接收机的设计进行了详细的描述,并介绍了迄今为止世界范围内已完成的具有里程碑意义的OFDM超大容量、超长距离光传输实验.最后,对Tb/s级光传输的发展进行了展望.
基金supported by the High Technology Research and Development Program of China("863"Program)under Grant No.2012AA011303 and 2013AA010501National Nature Science Foundation of China under Grant No.61325002
文摘In this paper, we investigate advanced digital signal process ing （DSP） at the transmitter and receiver side for signal pre equalization and postequalization in order to improve spec trum efficiency （SE） and transmission distance in an optical access network. A novel DSP scheme for this optical super Nyquist filtering 9 Quadrature Amplitude Modulation （9 QAM） like signals based on muhimodulus equalization with out post filtering is proposed. This scheme recovers the Ny quist filtered Quadrature PhaseShift Keying （QPSK） signal to a 9QAMlike one. With this technique, SE can be increased to 4 b/s/Hz for QPSK signals. A novel digital superNyquist signal generation scheme is also proposed to further suppress the Nyquist signal bandwidth and reduce channel crosstalk without the need for optical prefiltering. Only optical cou plers are needed for superNyquist wavelengthdivisionmulti plexing （WDM） channel multiplexing. We extend the DSP for shorthaul optical transmission networks by using highorder QAMs. We propose a highspeed Can＇ierless Amplitude/Phase 64 QAM （CAP64 QAM） system using directly modulated la ser （DML） based on direct detection and digital equalization. Decisiondirected least mean square is used to equalize the CAP64QAM. Using this scheme, we generate and transmit up to 60 Gbit/s CAP64QAM over 20 km standard single mode fiber based on the DML and direct detection. Finally, several key problems are solved for real time orthogonalfre quencydivisionmultiplexing （OFDM） signal transmission aml processing. With coherent detection, up to 100 Glfit/s 16 QAMOFDM realtime transmission is possible.
文摘A brief overview of recent experimental research on coherent optical fiber transmission systems at Queen＇s University is presented. Exemplary results are described that exploit real-time signal processing to assess the impact of cascaded optical filtering.
基金the National Natural Science Foundation of China(61047033)the Natural Science Foundation of Shandong Province in China(ZR2010FM043)State Key Laboratory of Advanced Optical Communication Systems and Networks (2011GZKF031109)
