Wei J L, Hamié A, Gidding R P, Hugues-Salas E, Zheng X, Mansoor S, Tang J M
School of Electronic Engineering, Bangor University, Dean Street, Bangor, LL57 1UT, UK.
Opt Express. 2010 Apr 12;18(8):8556-73. doi: 10.1364/OE.18.008556.
Detailed investigations of the transmission performance of adaptively modulated optical orthogonal frequency division multiplexed (AMOOFDM) signals converted using reflective semiconductor optical amplifiers (RSOAs) are undertaken over intensity-modulation and direct-detection (IMDD) single-mode fiber (SMF) transmission systems for WDM-PONs. The theoretical RSOA model adopted for modulating the AMOOFDM signals is experimentally verified rigorously in the aforementioned transmission systems incorporating recently developed real-time end-to-end OOFDM transceivers. Extensive performance comparisons are also made between RSOA and SOA intensity modulators. Optimum RSOA operating conditions are identified, which are independent of RSOA rear-facet reflectivity and very similar to those corresponding to SOAs. Under the identified optimum operating conditions, the RSOA and SOA intensity modulators support the identical AMOOFDM transmission performance of 30Gb/s over 60km SMFs. Under low-cost optical component-enabled practical operating conditions, RSOA intensity modulators with rear-facet reflectivity values of >0.3 outperform considerably SOA intensity modulators in transmission performance, which decreases significantly with reducing RSOA rear-facet reflectivity and optical input power. In addition, results also show that use can be made of the RSOA/SOA intensity modulation-induced negative frequency chirp to improve the AMOOFDM transmission performance in IMDD SMF systems.
针对波分复用无源光网络（WDM-PON）的强度调制与直接检测（IMDD）单模光纤（SMF）传输系统，开展了对使用反射半导体光放大器（RSOA）转换的自适应调制光正交频分复用（AMOOFDM）信号传输性能的详细研究。在上述包含最近开发的实时端到端OFDM收发器的传输系统中，对用于调制AMOOFDM信号的理论RSOA模型进行了严格的实验验证。还对RSOA和SOA强度调制器进行了广泛的性能比较。确定了最佳RSOA工作条件，该条件与RSOA后向反射率无关，且与SOA的相应条件非常相似。在确定的最佳工作条件下，RSOA和SOA强度调制器在60km单模光纤上支持相同的30Gb/s AMOOFDM传输性能。在低成本光组件支持的实际工作条件下，后向反射率值>0.3的RSOA强度调制器在传输性能上明显优于SOA强度调制器，随着RSOA后向反射率和光输入功率的降低，传输性能会显著下降。此外，结果还表明，可以利用RSOA/SOA强度调制引起的负频率啁啾来改善IMDD单模光纤系统中的AMOOFDM传输性能。
