Yeh C H, Chow C W, Chen H Y, Chen B W
Information and Communications Research Laboratories, Industrial Technology Research Institute (ITRI), Hsinchu, Taiwan.
Opt Express. 2011 Dec 19;19(27):26150-60. doi: 10.1364/OE.19.026150.
In this demonstration, we propose and demonstrate an adaptive long-reach passive optical network (LR-PON) using four-band orthogonal frequency division multiplexed (OFDM) channels. The downstream traffic rates from 6.25 to 40 Gb/s (using fixed quadrature amplitude modulation (QAM) level in the four OFDM bands) and from 9.37 to 40.3 Gb/s (using variable QAM levels in the four OFDM bands) can be achieved adaptively in the optical network units (ONUs) depending on different fiber transmission lengths from 0 to 100 km. For the upstream transmission, a 10 Gb/s 16-QAM OFDM signal with pre-emphasis is experimentally performed by using a 2.5 GHz directly modulated laser (DML). Based on the simulation and experimental results, the proposed adaptive four-band OFDM system could be a promising candidate for the future LR-PON.
在本演示中，我们提出并展示了一种使用四频段正交频分复用（OFDM）信道的自适应长距离无源光网络（LR-PON）。根据0至100 km的不同光纤传输长度，光网络单元（ONU）可自适应实现6.25至40 Gb/s（在四个OFDM频段中使用固定正交幅度调制（QAM）电平）以及9.37至40.3 Gb/s（在四个OFDM频段中使用可变QAM电平）的下行流量速率。对于上行传输，通过使用2.5 GHz直接调制激光器（DML），实验实现了带有预加重的10 Gb/s 16-QAM OFDM信号。基于仿真和实验结果，所提出的自适应四频段OFDM系统有望成为未来LR-PON的候选方案。
