上海大学特种光纤与光接入网重点实验室， 上海 200072
对正交频分复用无源光网（OFDM-PON）的上行通道物理层的吞吐量进行研究。OFDM-PON在光网络单元（ONU）端采用反射式半导体光放大器（RSOA）作为无色光源，实现双边带光强度调制，并在光线路终端（OLT）采用加半导体光放大器（SOA）前置放大的PIN光二极管做直接检测。基于一个RSOA的窄带相干积分模型，采用对有源区中载流子速率方程和光波传播方程的微扰解对RSOA的动态电光调制特性和频率啁啾特性进行理论与实验探讨，证明RSOA具有低通调制特性，其3 dB截止频率关联于偏置电流和输入光功率。利用RSOA的频率啁啾和SOA的高通增益特性，并将RSOA与中心波长蓝移的光滤波器级联，实现光学均衡，把上行通道的3 dB截止频率从1.5 GHz扩展到2.2 GHz。进一步采用自适应比特加载的调制格式，使通过一个RSOA的上行数据吞吐量可以达到4 Gb/s以上，则一个包含10个ONU的OFDM-PON的上行吞吐量可达到40 Gb/s。
光通信 吞吐潜力 正交频分复用无源光网 无色光源 反射式半导体光放大器 光调制器
Yinbo Qian 1,2,3Minming Zhang 1,2,3Deming Liu 1,2,3Lei Deng 1,2,3Kang Yang 1,2,3
Author Affiliations
Abstract
1 School of Optoelectronic Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
2 Wuhan National Laboratory for Optoelectronics, Wuhan 430074, China
3 National Engineering Laboratory for Next Generation Internet Access System, Wuhan 430074, China
A distributed access scheme using optical add/drop multiplexers (OADMs) for long reach hybrid wavelength division multiplexing and time division multiplexing passive optical networks (WDM-TDM PONs) is proposed and demonstrated. Colorless operations are implemented by using commercially available reflective semiconductor optical amplifiers (RSOAs) at both the center office (CO) and the customer side. Four 1.25-Gb/s channels are successfully transmitted over 80-km single-mode fiber with four OADMs. The dynamic input power range of the RSOA is also investigated. Compared with traditional access schemes, the proposed scheme could cover the area along the feed fiber with no blind zone. The experimental results show that it could be an ideal solution for the next generation access networks.
无源光网络 光分插复用器 分布式接入 反射式半导体光放大器 060.0060 Fiber optics and optical communications 060.2330 Fiber optics communications 060.4250 Networks 060.4254 Networks, combinatorial network design Chinese Optics Letters
2010, 8(9): 899
