Deb Nebras, Anis Hanan
School of Information Technology and Engineering (SITE), University of Ottawa, K1N 6N5, Canada.
Opt Express. 2011 Aug 15;19(17):16418-22. doi: 10.1364/OE.19.016418.
We propose a novel wavelength-division-multiplexed passive optical network (WDM-PON) architecture with enhanced tolerance toward chromatic dispersion where a DPSK-modulated downstream signal with constant intensity is remodulated at the ONU side with a return to zero (RZ-DPSK). Driving the downstream modulator with a 50% RZ data enabled us to employ the pulse carver at the ONU for both removing downstream data and generating the optical RZ signal for upstream. This offers an attractive alternative to earlier proposed schemes as it allows us to use full modulation depth (FMD) and balanced detection for downstream data restoration. We experimentally demonstrate the system with both balanced and single-ended detection at 2.5 Gb/s. Error-free operation has been achieved along a 20 Km single mode fiber without dispersion compensation.
我们提出了一种新型的波分复用无源光网络（WDM-PON）架构，该架构对色散具有更高的容忍度。在这种架构中，具有恒定强度的DPSK调制下行信号在光网络单元（ONU）侧被归零调制（RZ-DPSK）重新调制。用50%占空比的归零数据驱动下行调制器，使我们能够在ONU处使用脉冲切割器，既去除下行数据，又生成用于上行的光归零信号。这为早期提出的方案提供了一个有吸引力的替代方案，因为它允许我们使用全调制深度（FMD）和平衡检测来恢复下行数据。我们在2.5 Gb/s速率下通过平衡检测和单端检测对该系统进行了实验演示。在没有色散补偿的情况下，沿着20公里的单模光纤实现了无误码操作。
