光学学报, 2016, 36 (9): 0906002, 网络出版: 2016-09-09   

基于反射式半导体光放大器的OFDM-PON上行通道吞吐潜力

Throughput Potential of Orthogonal Frequency Division Multiplexing Passive Optical Network Uplink Based on Reflective Semiconductor Optical Amplifiers
作者单位
上海大学特种光纤与光接入网重点实验室, 上海 200072
摘要
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。
Abstract
The uplink physical throughput potential of orthogonal frequency division multiplexing passive optical network (OFDM-PON) is discussed. Reflective semiconductor optical amplifiers (RSOAs) are used in optical network units (ONUs) as the colorless resources to produce the dual-sideband intensity modulation, and a PIN photodiode with semiconductor optical amplifier (SOA) as pre-amplifier is used in optical line terminal (OLT) to complete direct detection. Based on a coherent narrowband integral model of RSOA, the weak perturbation solutions of the carrier rate equation and the wave propagation equation are used to investigate the RSOA’s dynamic electro-optical modulation behavior and frequency chirp characteristic theoretically and experimentally. It is proved that the RSOA is of low-pass modulation characteristics, and its 3 dB cut-off frequency is related to the bias current and the inject optical power. The optical equilibrium is achieved and the 3 dB cut-off frequency of the uplink can be promoted from 1.5 GHz up to 2.2 GHz by taking advantage of RSOA’s optical frequency chirp and the high-pass optical gain characteristic of SOA, and cascading a blue-shifted optical band-pass filter with RSOA. Furthermore, by utilizing the adaptive bit loading modulation, the data throughput in one RSOA-based uplink can reach 4 Gb/s and above,which means that the total uplink throughput of an OFDM-PON with ten RSOA-based ONUs can achieve 40 Gb/s.

邝彩霞, 陈荣荣, 宋英雄, 汪敏, 林如俭. 基于反射式半导体光放大器的OFDM-PON上行通道吞吐潜力[J]. 光学学报, 2016, 36(9): 0906002. Kuang Caixia, Chen Rongrong, Song Yingxiong, Wang Min, Lin Rujian. Throughput Potential of Orthogonal Frequency Division Multiplexing Passive Optical Network Uplink Based on Reflective Semiconductor Optical Amplifiers[J]. Acta Optica Sinica, 2016, 36(9): 0906002.

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