高速相干光传输系统数字信号处理技术研究

高的频带效率和能量效率,与先进调制方式相干检测技术有机地结合,针对下一代高速光通信网络而言,已经是比较有前途的技术.将电子技术领域中的数字信号处理功能有效地利用,无论对于偏振模色散和色度色散,还是光纤非线性效应和激光相位噪声等相关的传输损耗,相干光接收机都能够给予良好补偿.

高速相干光通信传输系统与数字信号处理技术的研究

在现代社会,通信效率在一定程度上决定了工作的效率,所以说如何提高通信效率,如何对通信系统进行有效的改善,需要人们不断地创新。在我们的日常生活中和在网络中,经常会听到一些名词,比如宽带、光纤等等,这些都是高速相干光通信传输系统的应用,同时还有我们常见的一些设备,比如电视、电脑以及一些智能显示屏等,都用到了数字信号处理技术。

100Gb/sPDM-QPSK系统传输性能评估技术研究

研究了基于高速相干光接收的100Gb/s PDM-QPSK系统的传输性能评估技术,将解析评估公式推广到不同调制格式、带宽和不规则链路跨段等应用场景中并进行系统仿真验证。仿真结果显示,该评估方法能快速、准确地计算出不同功率、调制格式和跨段配置下的系统传输性能,Q因子误差低于0.8d B。

Parallel Spectral-Domain Optical Coherence Tomography for Non-Scattering Object Imaging

The parallel spectral-domain optical coherence tomography（PSDOCT） is described for highspeed optical coherence tomography（OCT） without lateral scanning. In this setup, the self-elimination of auto-correlation（AC） interference algorithm was used for eradicating the AC interference and ghost images. However, when performed in free space OCT, this algorithm still generated a weak DC component. The algorithm was improved by adding the background intensity part to compensate for the mutual interference between object and reference arms. The results demonstrate that the DC component can be eradicated. Compared with conventional QCT and complex Fourier-domain optical coherence to- mography, the advantages of PSDOCT with the improved algorithm in free space are that it has no moving parts to generate consecutive phase shift, the structure of the object can be reconstructed immediately and automatically, and the speed is approximately 16 times faster than those of the other two in the same case.