搜索结果: 1-15 共查到“光学仪器及技术 OFDM”相关记录24条 . 查询时间(0.765 秒)
针对相干光正交频分复用系统中出现的高峰值平均功率比问题,提出用小波包变换取代传统快速傅里叶变换的相干光正交频分复用系统.仿真实验证明了具有良好正交性的小波包变换对高峰值平均功率比起到一定程度上的抑制作用,且误码率性能优于传统的快速傅里叶变换.随着小波尺度函数及小波函数对称性的提升,其避免信号处理过程中的相移的能力提高,系统性能有所改善.与传统的快速傅里叶变换系统相比,基于小波包变换的系统中,小波基...
室内可见光OFDM通信系统调光控制技术
可见光通信 调光控制 光正交频分复用技术 脉冲宽度调制 调光范围 单极化正交频分复用技术 照明
2016/12/10
针对室内可见光通信高速率传输和照明控制的问题,分析了采用脉冲宽度调制调光控制技术的可见光正交频分复用技术系统的调光性能与误码性能.提出了基于功耗小、性能好的单极性正交频分复用系统的调光控制方案,对单极性正交频分复用系统的驱动电流和误码率特性进行了仿真,仿真结果表明,单极性正交频分复用系统可在不牺牲照明质量的同时改善系统性能.此外,针对室内低照明、低功耗的应用需求,提出了一种功率更加有效的补零非对称...
A Novel MAMSK-OFDM technology for Next Generation Optical Access Networks
Novel MAMSK-OFDM technology Next Generation Optical Access Networks
2015/5/25
We propose and experimentally demonstrate a novel MAMSK-OFDM-PON. 5-Gb/s MAMSK-OFDM signal and 2.5-Gb/s upstream OOK signal is transmitted over 20km fiber successfully. The results show the prospect o...
World-First Experimental Demonstration of Synchronous Clock Recovery in an 11.25Gb/s Real-Time End-to-End Optical OFDM System Using Directly Modulated DFBs
Synchronous Clock Recovery Real-Time End-to-End Optical OFDM System Directly Modulated DFBs
2015/5/20
A simple, highly-effective, DSP-free, optical OFDM(OOFDM) synchronous clock recovery technique preserving system performance and enhancing stability is proposed and experimentally demonstrated, for th...
Recent Progress on Real-Time DSP for Direct Detection Optical OFDM Transceivers
Recent Progress Real-Time DSP Direct Detection Optical OFDM Transceivers
2015/5/20
We describe recent developments in real-time digital signal processing for direct detection optical OFDM transceivers, including the optimization of high throughput FFT algorithms and receiver synchro...
7dB Optical Power Budget Improvements of 11.25Gb/s Optical OFDM PON Systems Using Optical Filters
7dB Optical Power Budget Improvements 11.25Gb/s Optical OFDM PON Systems Optical Filters
2015/5/20
Wavelength offset super Gaussian optical filters enable 7dB increases in optical power budget of 11.25Gb/s optical OFDM PON systems using directly modulated DFBs, considerably relax filter bandwidth r...
7dB Optical Power Budget Improvements of 11.25Gb/s Optical OFDM PON Systems Using Optical Filters
7dB Optical Power Budget Improvements 11.25Gb/s Optical OFDM PON Systems Optical Filters
2015/5/20
Wavelength offset super Gaussian optical filters enable 7dB increases in optical power budget of 11.25Gb/s optical OFDM PON systems using directly modulated DFBs, considerably relax filter bandwidth r...
Significant Overhead Reduction of Multi-band Tb/s Coherent Optical OFDM Systems
Multi-band Tb/s Coherent Optical OFDM Systems Overhead Reduction
2015/5/15
The timing and optical laser phase of individual bands in multi-band OFDM are correlated. We significantly reduce the OFDM overhead through using FFT window synchronization for channel estimation and ...
The Impact of the Combined 8-QAM and QPSK Subcarrier Modulation for Coherent Optical OFDM
8-QAM QPSK Subcarrier Modulation OFDM
2015/5/15
We investigated the optimized signal condition of the combined 8-QAM and QPSK subcarrier modulation for optical OFDM. The performance improvement was confirmed by WDM transmission experiments with the...
On the Spectrum-Efficiency of Bandwidth-Variable Optical OFDM Transport Networks
Spectrum-Efficiency Bandwidth-Variable Optical OFDM Transport Networks
2015/6/10
We investigated the high spectrum efficiency property of the bandwidth-variable optical OFDM (BV-OOFDM) transport networks. In contrast to mixed-line-rate (MLR) networks, BV-OOFDM enables flexible all...
Efficient Digital Coherent Detection of A 1.2-Tb/s 24- Carrier No-Guard-Interval CO-OFDM Signal by Simultaneously Detecting Multiple Carriers Per Sampling
Coherent communications Phase modulation
2015/6/10
We experimentally demonstrate efficient detection of a 1.2-Tb/s 24-carrier NGI-CO-OFDM signal with 12.5-Gbaud PDM-QPSK carrier-modulation by simultaneously recovering 2 or 3 carriers per 50-GSamples/s...
OFDM vs. OOK with MLSD for IM/DD Systems
Fiber optics communications Fibers single-mode Modulation
2015/6/8
We compare the performance of direct-detection OFDM techniques using optimized power allocations to the performance of OOK with MLSD in amplified direct-detection systems using single-mode fiber.
Optical Biasing in Direct Detection Optical-OFDM for Improving Receiver Sensitivity
Fiber optics communications Modulation
2015/6/4
We show that replacing of electrical by an optical biasing minimizes the nonlinearity effect of an optical modulator. This allows the amplitude of the driving signal to be increased which increases th...
Improvement of Phase Noise Compensation for Coherent Optical OFDM via Data-Aided Phase Equalizer
Modulation Coherent communications
2015/6/4
We report a novel data-aided phase equalizer for coherent optical OFDM systems with RF-pilot enabled phase noise compensation. Simulation results corroborate the superior performance for different RF-...
Impact of Polarization-mode Dispersion on Wavelet Transform Based Optical OFDM Systems
Fiber optics communications Modulation
2015/6/4
The impact of PMD on wavelet transform based optical OFDM (WTO-OFDM) systems is investigated. Simulations show that WTO-OFDM is very sensitive to PMD. A 1-dB penalty at 5-ps DGD is incurred for 112-Gb...