搜索结果: 1-15 共查到“光通信器件与系统技术 Modulation”相关记录34条 . 查询时间(0.079 秒)
31 Gbps RoF System Employing Adaptive Bit-Loading OFDM Modulation at 60 GHz
Optical Communications Modulation
2015/5/26
Record wireless data transmission of 31.4 Gbps within 7 GHz license-free band at 60 GHz is experimentally demonstrated using adaptive bit-loading OFDM modulation. Adaptive bit-loading OFDM also enable...
Three-Dimensional Subcarrier-Multiplexed Nonbinary- LDPC-Coded Modulation Schemes Enabling Ultra High Speed Optical Communications
Fiber optics communications Modulation Low-density parity-check codes
2015/5/25
We propose nonbinary-LDPC-coded modulation schemes employing subcarrier-multiplexing and three-dimensional constellations. We improve coding gains of conventional PDM-M-QAM by 2.17dB and 2.92dB, for M...
First Experimental Demonstration of Nonbinary LDPC- Coded Modulation Suitable for High-Speed Optical Communications
Fiber optics and optical communications Modulation Low-density parity- check (LDPC) codes
2015/5/25
The first experimental demonstration of nonbinary-LDPC-coded optical transmission is presented. Using DQPSK, we can achieve >8dB and ~10dB net coding gains at the BER of 10 -6 in the absence and prese...
On the Reverse Concatenated Coded-Modulation for Ultra- High-Speed Optical Transport
Fiber optics optical communications Reverse concatenated FEC
2015/5/25
We propose reverse concatenated code with inner BCH code and outer LDPC code.BCH decoder is based on MAP-decoding that provides high-accuracy-reliabilities for suboptimum-LDPC-decoder, leading to perf...
Robust BPSK Impulse Radio UWB-over-Fiber Systems Using Optical Phase Modulation
Coherent communications Radio frequency photonics
2015/5/22
The impact of fiber dispersion on the performance of optical phase modulated impulse-radio-ultrawideband (IR-UWB) signals is experimentally investigated. 2Gbps BPSK IR-UWB over 78km fiber transmission...
40 Gb/s Carrierless Amplitude and Phase Modulation for Low-Cost Optical Datacommunication Links
Fiber optics communications Modulation
2015/5/22
4 bps/Hz 40 Gb/s carrierless amplitude and phase (CAP) modulation is investigated for next-generation datacommunication links. The 40 Gb/s link achieves double the length of a conventional NRZ scheme,...
10 Gbit/s modulation of Reflective SOA without any electronic processing
Fiber optics communications Semiconductor optical amplifiers Modulators
2015/5/22
For the first time, we demonstrate that the use of a long RSOA as remote modulator enables short distance transmission on SMF below the FEC limit at 10 Gbit/s without any electronic processing.
Coded modulation schemes for optical transport are reviewed and coding of 4-D constellations is discussed including iterative demapping for soft-detection of polarization-switched QPSK which achieves ...
Line Coding for Downlink DML Modulation in λ λ-Shared, RSOA-based Asymmetric Bidirectional WDM PONs
Line Coding Downlink DML Modulation λ λ-Shared RSOA-based Asymmetric Bidirectional WDM PONs
2015/5/20
We experimentally investigate the use of various DC-balanced line codes for downlink modulation in single-fiber, wavelength-shared WDM-PON systems which employ 10-Gbps directly modulated lasers and 2....
Coded Multidimensional Pulse Amplitude Modulation for Ultra-high-speed Optical Transmission
Coded Multidimensional Pulse Amplitude Modulation ltra-high-speed Optical Transmission
2015/5/15
We propose a coded N-dimensional pulse-amplitude modulation (ND-PAM) suitable for ultra-high-speed serial optical transport. The polarization-multiplexed-ND-PAM significantly outperforms corresponding...
Use of discrete modulation and a continuous wave local oscillator in a 24 km continuous variable quantum key distribution system
Quantum cryptography Quantum communications
2015/6/10
We implement an experimental continuous variable quantum key distribution system over 24 km of optical fiber that uses discrete signaling and a continuous wave local oscillator. A secure key rate of 3...
Secure Optical Communication Using Single Phase Modulator for Bit-by-bit Code Scrambling and DPSK Data Modulation
Fiber optics communications Optical security and encryption Phase modulation
2015/6/9
We proposed a novel bit-by-bit code-hopping scheme using single phase modulator for secure optical communication and experimentally demonstrated the transmission of 2.5Gbps DPSK data secured by scramb...
Security Enhanced SPECTS O-CDMA with Four-State Encoded Data Modulation
Networks Optical security encryption.
2015/6/9
We demonstrate a security enhancement mechanism based on four-state temporal optical coding which protects a SPECTS O-CDMA upstream link against eavesdropping including DPSK detection. The FPGA-based ...
Quadrature Duobinary Modulation for 100G Transmission Beyond the Nyquist Limit
Fiber optics communications Coherent communications
2015/6/8
Quadrature duobinary (QDB) modulation with coherent detection is proposed for 112-Gb/s transmission systems. With proper system design for maximum spectral efficiency, we show that dual polarization Q...
230 Mbit/s via a Wireless Visible-Light Link based on OOK Modulation of Phosphorescent White LEDs
Free-space optical communication Light-emitting diodes
2015/6/8
We report a first indoor wireless visible-light link operating up to 230 Mbit/s by use of on-off-keying and with bit-error-ratios below 2·10 -3 . The results were achieved for illuminance levels recom...