High Spectral Efficiency and High Splitting Ratio PON System based on Double-sided Multiband DDO-OFDM System

• Main Author: 沈冠恆
• Other Authors: 馮開明
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/35629432995787320559

碩士 === 國立清華大學 === 通訊工程研究所 === 101 === With the progress of nowadays broadband multi-services, such as video-on-demand, video/photo sharing and interacting games etc., the Internet traffic is increasing drastically. Most currently deployed optical passive networks (PON) which employing on-off keying modulation reveal a great insufficiency of data rate. To solve this problem, OFDM, a very popular scheme, has been applied. In this paper, we demonstrate 120Gbps double-sided multiband OFDMA-PON by using direct detection to demodulate signal. To avoid signal-signal beating interference (SSBI) in inherent square-law photo detection, we use a simple optical band pass filter to sift out the desired OFDM band without SSBI contamination at optical network unit (ONU) receiver. Furthermore, we proposed and successfully demonstrated a water-filling configuration which downstream data rate achieves 150Gbps on single optical carrier. In the transmissions of short-reach pon (SR-PON, 25km) and long-reach pon (LR-PON, 100km), the splitting ratios achieve 1:180 and 1:1024. At the upstream transmitter in ONU, to decrease the cost we adopt carrier-reused scheme to generate upstream carrier. The modulation scheme is using QPSK format with coherent detection. Finally, we demonstrated a double-sided multiband direct detect optical OFDM (DDO-OFDM) PON system based on a bidirectional configuration.