Novel DWA Protection Scheme and Optical Network Monitoring System

• Main Authors: Chun-Hung Cheng, 鄭俊宏
• Other Authors: San-Liang Lee
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/88750453618171371362

碩士 === 國立臺灣科技大學 === 電子工程系 === 95 === This thesis includes two major topics. First, we design novel protection structures for dynamic wavelength allocation (DWA) of passive optical networks (PONs). We evaluate these structures base on the consideration for using the shortest extra fiber length. The basic concept is to use passive optical components to connect remote nodes to form a ring topology, and use the ring as protection path. We design three kinds of protection structures for DWA PON. The passive optical components that used in a romote node (RN) are broadband filter, optical add/drop multiplexer (OADM), and 1×2 coupler, respectively. We analyze these structures and discuss how to improve the protection system in the future. Second, we propose a low-cost optical monitoring system which uses a tunable laser to transmit a frequency modulated signal to optical network units (ONUs). Each ONU has a different reflective interference device which has different free spectrum range (FSR). The reflective signals from each ONU are orthogonal to each other and almost sinusoidal. After Fourier transformation, these frequencies can be used to monitor the condition of each ONU. In the practical application, we can monitor the PON by using a frequency analyzer.