搜索结果: 1-15 共查到“光信息技术 QAM”相关记录33条 . 查询时间(0.062 秒)
Performance Improvement by Fibre Nonlinearity Compensation in 112 Gb/s PM M-ary QAM
Coherent communications Nonlinear optics fibers
2011/5/26
We demonstrate that digital back-propagation offers up to six-fold enhancement in transmission reach when nonlinear fibre impairments are compensated in coherently-detected 112 Gb/s PM m-ary QAM, with...
Optimized Pulse Shaping for Intra-channel Nonlinearities Mitigation in a 10 Gbaud Dual-Polarization 16-QAM System
Fiber optics communications Modulation
2011/5/26
An optimized pulse shape is shown to reduce intra-channel nonlinear effects in a 10 Gbaud dual-polarization 16-QAM EDFA-amplified system without optical dispersion compensation.
Demonstration of Converged Bidirectional OFDM-m-QAM RoF and WDM-OFDM-PON Access Networks
Networks Optical communications
2011/5/26
We demonstrate a novel lightwave centralized hybrid bidirectional WDM-OFDM-PON and OFDM-m-QAM RoF network. The 11.29-Gb/s OFDM-16QAM wired DL, 5.65-Gb/s OFDM-QPSK wired UL and WiMAX downstream/upstrea...
Real-Time FPGA-Based Intradyne Coherent Receiver for 40 Gbit/s Polarization-Multiplexed 16-QAM
Coherent communications Optical communications
2011/5/25
Real-time detection of a 40 Gbit/s polarization-multiplexed square 16-QAM signal is demonstrated in an FPGA-based intradyne coherent receiver processing 100% of data. A minimum BER of 3.3×10 -5 is ach...
Real-time FPGA-based Coherent Optical Receiver for 1 Gsymbol/s, 64 QAM Transmission
Coherent communications Fiber optics communications
2011/5/25
We demonstrated the first time real-time FPGA-based coherent optical receiver for a 64 QAM transmission. Error free performance (BER < 1x10 -12 ) was achieved under a back-to-back condition and the BE...
SOA/REAM as Vector Modulator for QAM Upstream
Fiber optics communications Modulation Semiconductor optical amplifiers
2011/5/21
Simultaneous encoding of information in the optical phase and amplitude for upstream transmission is demonstrated with an integrated SOA/REAM of small form factor. The crosstalk penalties between the ...
120-Gb/s PDM 64-QAM transmission over 1,280 km using multi-staged nonlinear compensation in digital coherent receiver
120-Gb/s PDM 64-QAM transmission multi-staged nonlinear compensation digital coherent receiver
2011/5/21
We succeed in the long-haul (1,280km) transmission of a 120-Gb/s PDM 64-QAM signal. The transmission distance was extended from 800 km to 1,280 km by a multi-stage nonlinear compensation technique tha...
28-Gbaud InP Square or Hexagonal 16-QAM Modulator
28-Gbaud InP Square Hexagonal 16-QAM Modulator
2011/5/20
We demonstrate a monolithic InP modulator that produces 28-Gbaud (112 Gb/s) square or hexagonal 16-QAM using four integrated amplitude/phase modulators. We achieve bit-error rates of 2.7×10 -3 and 3.8...
Low Computation Complexity Two-Stage Feedforward Carrier Recovery Algorithm for M-QAM
Low Computation Complexity Two-Stage FeedforwardCarrier Recovery Algorithm M-QAM
2011/5/20
We propose a modified two-stage feedforward carrier recovery algorithm for M-QAM formats that achieves a 3x reduction in computation complexity compared to a single-stage algorithm. When combining wit...
Low-Complexity, Blind Phase Recovery for Coherent Receivers Using QAM Modulation
Low-Complexity Blind Phase Recovery Coherent Receivers QAM Modulation
2011/5/20
We propose a new hybrid PLL/ML phase estimation method for low-complexity, blind phase recovery for M-QAM modulation. The linewidth tolerance of the proposed method is more than one order of magnitude...
Non-Data-Aided Wide-Range Frequency Offset Estimator for QAM Optical Coherent Receivers
Non-Data-Aided Wide-Range Frequency Offset Estimator QAM Optical Coherent Receivers
2011/5/20
We propose and experimentally demonstrate a novel blind frequency offset estimator for coherent quadrature amplitude modulation (QAM) receivers. Its frequency offset estimation range is more than thre...
Characterization of an Integrated Coherent Receiver for 224 Gb/s Polarization Multiplexed 16-QAM Transmission
224 Gb/s Polarization Multiplexed 16-QAM Transmission Coherent Receiver
2011/5/15
An integrated coherent receiver module based on monolithically integrated 90° hybrids and balanced waveguide pin-photodiodes is presented. Optical transmission performance is demonstrated for a 224 Gb...
160-Gb/s Polarization-Multiplexed 16-QAM long-haul transmission over 3,123 km using digital coherent receiver with digital PLL based frequency offset compensator
Fiber Optics Communications Coherent communications
2010/6/9
We demonstrate 160-Gb/s PDM 16-QAM single channel transmission over the longest distance yet to be reported, of 3123.9 km. The coherent receiver employs a frequency offset compensator based on a digit...
Pseudo-Newton based Equalization Algorithms for QAM Coherent Optical Systems
Coherent communications Optical communications
2010/6/8
In 112Gbit/s optical coherent transmission context, we propose decision-directed and blind adaptive equalizers using variable step size suitable for 16-QAM. The considered algorithms offer better stea...
End-to-End Real-Time Demonstration of 128-QAM- Encoded Optical OFDM Transmission with a 5.25bit/s/Hz Spectral Efficiency over IMDD Systems
Fiber optic communications Modulation Fibres single mode
2010/6/8
Real-time optical OFDM transceivers with 128-QAM encoding are experimentally demonstrated, for the first time, which enable 5.25Gb/s end-to-end transmission with the highest spectral efficiency of 5.2...