搜索结果: 1-15 共查到“工学 long haul”相关记录26条 . 查询时间(0.07 秒)
No-till agriculture increases crop yields, environmental gains over long haul（图）
No-till agriculture increases crop yields environmental gains long haul
2020/5/29
A study in Global Change Biology clearly demonstrates significant benefit to the environment and to crop yield for farmers practicing no-till versus tilled agriculture consistently...
Long-Haul Atmospheric Laser Communication Systems
Free-space optical comm Optical comm Atmospheric propagation
2015/5/26
Optical communications provides an attractive means of achieving wideband data transfer over long distances. We review perceived challenges and enabling technology developments that promise to facilit...
Comparison of Pulse Shapes in a 224Gbit/s (28Gbaud) PDM-QAM16 Long-Haul Transmission Experiment
Fiber optics communications Phase modulation
2015/5/20
We investigate the effectiveness of RZ50 versus NRZ in a 224Gbit/s PDM-QAM16 transmission. Record distances of 2000km and 1520km are reported for single- and 3-channel transmission over SMF links with...
Field Trial of In-Service PMD Measurement Using Idle DWDM Channels in Operational Long Haul Network
Long Haul Network DWDM Channels PMD Measurement
2015/5/18
In-service PMD measurement using idle channels in an operational DWDM long-haul network is realized with two novel measurement approaches during a field trial. Accurate PMD results are obtained withou...
Comparison of RZ and NRZ Formats in 112-Gb/s PDM- QPSK Long Haul Coherent Transmission Systems
Coherent Transmission Systems PDM- QPSK RZ\NRZ Formats
2015/5/15
We show that 112-Gb/s PDM-QPSK coherent transmission systems with RZ pulse shape have better tolerance to ROADM filtering than NRZ, and time-interleaved RZ-PDM-QPSK outperform NRZ-PDM-QPSK in nonlinea...
Experimental Study on Broadband Nonlinear Phase Wandering in Coherent Detection Long-Haul Transmissions
Coherent communications Fiber optics communications
2015/6/9
We investigate fast phase wandering observed in coherent detection long-haul transmission experiments. We demonstrate the phase wandering is a broadband nonlinear effect.We compare its impact on diffe...
Experimental Demonstration of Coherent MAP Detection for Nonlinearity Mitigation in Long-Haul Transmissions
Coherent communications Fiber optics communications
2015/6/9
We implemented a maximum a posteriori probability (MAP) detection scheme for mitigating nonlinear phase distortion. We demonstrated 1 dB improvement in system performance and ~2dB higher nonlinearity ...
Long-haul coherent QPSK transmission of 40G channels with 120% spectral efficiency using increased linearity dispersion map with 100km spans and EDFAs
fiber optics communications Coherent communications
2015/6/9
We study transmission of 40 Gb/s signals using coherent RZ-QPSK with and without polarization multiplexing using 100km large effective area fiber-spans and dual-stage EDFAs with mid-stage dispersion c...
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
2015/6/9
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...
Concatenated QC-LDPC and SPC Codes for 100 Gbps Ultra Long-Haul Optical Transmission Systems
Fiber optics communications Optical communications
2015/6/8
We propose and investigate a novel FEC coding scheme based on a concatenation of QC-LDPC with single-parity-check codes. High performance of a Q-limit of 5.8 dB with 20.5% overhead has been achieved w...
Intra-Channel Chromatic Dispersion Measurements with Live Neighboring Signals in a Long Haul DWDM System
Optical communications Networks wavelength routing Fiber measurement
2015/6/5
A novel four-tone probe signal is used to measure end-to-end residual chromatic dispersion in single 50-GHz DWDM channels of a long-haul ROADM network while transmitting more than 30 live signals in n...
Challenges of 40/100 Gbps deployments in long-haul transport networks on existing fibre and system infrastructure
Optical communications Modulation
2015/6/5
High-bandwidth services require faster long-haul transport networks. Meanwhile operators are not ready to make evolve significantly their fibre infrastructure based on PMD-limited G.652 fibre while th...
100G Coherent DWDM Transponder Module Enabling Seamless Upgrade of Long Haul Optical Transmission Systems
Optical communications Coherent communications
2015/6/5
We review recent trends and progress in 100G module and subsystem development for long haul DWDM applications and explore similarities and differences between these 100G products and those developed a...
First Demonstration of 80-km Long-Haul Transmission of 12.5-Gb/s Data Using Silicon Microring Resonator Electro-Optic Modulator
Optoelectronics Modulation
2015/6/4
First demonstration of long-haul transmission reaching bandwidth-distance product of 1-Tb-km/s, using silicon microring resonator electro-optic modulator, sets new precedence for silicon photonic appl...
Advances in Fibers and Transmission Line Technology for Long Haul Submarine Systems
Advances Fibers Transmission Line Technology Long Haul Submarine Systems
2015/7/20
We review recent development of optical fibers for submarine networks. Further we discuss how new signal formats and increased bit rates change the requirements for fibers and challenge the balance be...