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1.
We propose a configuration of a wavelength division multiplexing (WDM)-visible light communication (VLC) system using orthogonal frequency division multiplexing (OFDM) modulation and an adaptive Nyquist windowing of the OFDM signal in the receiver. Based on this configuration, we demonstrate a 750-Mb/s WDM-VLC transmission based on RGB light-emitting diode (LED) with a distance of 70 cm. The measured bit error rate (BER) for all channels are under the pre-forwaxd error correction limit of 3,8 × 10-3. The BER performances of all the channels of the proposed WDM-VLC system show considerable improvement compared with those of the system without Nvauist windowing.  相似文献   
2.
研究了基于双臂马赫-曾德尔调制器(MZM)产生全光正交频分复用信号的原理,讨论了正交光子载波的产生由MZM的射频驱动和直流偏置电压决定的特性;并对基于载波抖动对系统的损伤定义了一个新的参数--载波均衡,以准确地描述产生全光正交频分复用载波的传输性能.根据选择的载波均衡参数,得到了产生2,3,4和5条正交光载波的最佳工作...  相似文献   
3.
陶理  迟楠 《光学学报》2012,32(4):406003-75
提出了一种新型的基于串行结构的最小频移键控调制技术,产生了相位连续,频谱宽度窄,每码元时间有两次π/2相移,类似于传统最小频移键控调制信号,给出了该调制方案的理论推导,并将其应用于8进制的多维多阶调制系统中。理论和仿真分析了不同的8进制调制方案在频谱特性,残留色散容限,自相位调制容限的不同,还分析了其受到系统滤波带宽的影响。最后仿真实现了通过350km的色散完全补偿的光纤120Gb/s的数据传输。  相似文献   
4.
超宽带可调谐SOA四波混频波长变换器的实验研究   总被引:5,自引:2,他引:3  
迟楠  齐江  郑远  陈树强  管克俭 《光子学报》2000,29(7):654-658
基于半导体光放大器(SOA)光纤环形激光器中的双泵浦四波混频效应,构成超宽带并且完全透明的波长变换器,成功实现1550nm窗口2.5Gb/s信号的可调谐波长变换,变换效率在50nm范围内保持基本平坦,同时测出了SOA增益和自发辐射(ASE)噪音功率的关系.实验结果表明,在一定限制条件下,提高泵浦功率可以提高变换信号的信噪比.  相似文献   
5.
We propose an integral imaging system that uses three lens arrays, including two convex lens arrays and a concave lens array. Compared with the conventional integral imaging system, the proposed system can remarkably enhance the viewing angle. The maximum viewing angle can be enlarged to 48~, which is 4.8 times wider than that of the conventional system. The principle of the proposed system is elucidated, and the experimental results are presented in this letter.  相似文献   
6.
We propose a novel scheme for optical frequency-locked multi-carrier generation based on a directly modu- lated laser (DML) and a phase modulator (PM) in cascade through synchronous sinusoidal radio frequency (RF) signal. The optimal operating zone for the cascaded DML and PM scheme is determined via theoreti- cal analysis and numerical simulation. We demonstrate 16 optical subcarriers can be successfully generated based on the cascaded DML and PM scheme in the optimal zone. The generated 16 optical subcarries have frequency spacing of 12.5 GHz and power difference of less than 3 dB. These results agree well with those of the numerical simulation. We also demonstrate intensity modulation and direct detection (IM-DD) based on one of the 16 generated optical subcarriers. After 20-km single-mode fiber-28 (SMF-28) transmission, the bit-error ratio (BER) of 1×10^-9 can be attained for both 3.125- and 12.5-Gb/s bit rates.  相似文献   
7.
基于XGM的SOA波长变换器噪音特性分析及优化设计   总被引:2,自引:1,他引:1  
迟楠  徐林  陈树强  管克俭 《光子学报》2000,29(4):317-321
利用动态载流子恢复时间可以精确模拟基于交叉增益调制的SOA全光波长变换器的饱和增益效应,本文将SOA分段ASE噪音功率和分段动态模型结合,得到沿长度分布的ASE噪音功率,并讨论了偏置电流、泵浦光和探测光的波长、功率、SOA长度对消光比和信噪比的影响理论计算结果表明,大的偏置电流有利于提高消光比和信噪比;对于一定的输入波长,相对较大的泵浦光和相对较小的探测光变换效果好;SOA的长度存在最佳值.  相似文献   
8.
相干且频率锁定的正交多载波光源产生技术在光通信领域有着诸多应用,能广泛用于微波光子学、全光信号处理以及波分复用(WDM)技术和正交频分复用(OFDM)技术.互联网数据业务的快速增长使得超宽带大容量骨干网传输技术越来越受到世界各国的重视,而要实现Tb/s超大容量传输,目前使用的最主要的方法是光的波分复用(WDM)或正交频分复用(OFDM)技术.作为实现光WDM或OFDM的一项关键技术,相干和频率锁定的正交多波长光源技术引起了国内外各大科研机构的强烈关注.介绍了国内外多载波技术的现状以及多载波产生的多种方案,并对每一个方案进行了对比分析,为未来的研究提供了一些参考.  相似文献   
9.
We propose and experimentally demonstrate a novel scheme to realize polarization-division-multiplexing quadrature-phase-shift-keying (PDM-QPSK) signal transmission over fiber, wireless and fiber at Wband (75-110 GHz). The generation of polarization multiplexing millimeter-wave (mm-wave) wireless signal is based on the photonic technique. After 20-km fiber transmission, polarization diversity and heterodyne beating are implemented to convert the polarization components of the polarization-multiplexing signals from the optical baseband to W-band so that up to 16 Gb/s mm-wave signals can be delivered over 2-m 2~2 multiple-input multiple-output (MIMO) wireless link. At the receiver base station (BS), polarization combination reconstructs the PDM-QPSK signal which is then launched into another 20-km fiber. In the experiment, coherent detection is introduced to improve receiver sensitivity and constant modulus algorithm (CMA) is applied for polarization de-multiplexing. The bit-error-ratio (BER) for 16-Gb/s PDM- QPSK signal delivery is below the forward-error-correction (FEC) threshold of 3.8× 10-3 with the optical signal-to-noise ratio (OSNR) above 11.8 dB.  相似文献   
10.
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