Theoretical And Experimental Investigation Of SOA Based Long-reach Passive Optical Network

Passive optical network (PON) is regarded as one of the most promising solution for the first mile, by sharing the feed fiber and central office equipments to a large number of subscribers. However, with the rapid growth of the bandwidth demands, especially after the appearance of the peer-to-peer (P2P) networking technology, many multiplexing techniques are deployed in the access network to maintain the cost-effectiveness of PONs. In all kinds of technologies, wavelength-division-multiplexed passive optical network (WDM-PON) has been regard as a promising solution to meet the fast increasing tendency. But the expensive WDM device cost limits its applications in the optical access network in which cost is shared by a few subscribers. Hybrid TDM/WDM PON (HPON) is a promising optical access network solution taking advantages of both TDM-PON and WDM-PON. HPON is suitable for near future deployment in pragmatic migration from current TDM-PONs to future WDM-PONs.By providing extended coverage, LR-PON combines optical access and metro networks into an integrated system. Thus, cost savings are also achieved by simplifying the network, reducing the number of equipment interfaces, network elements and even nodes. The research in this dissertation was supported by the national "Eleventh Five-Year" " 863 " Program Project, launched a system-depth analysis and technical innovation on long reach WDM/TDM hybrid passive optical network. The main contents of this thesis are as the follo wings:(1) Operation principle and operation conditions for all-optical wavelength conversion module based on the cross-gain modulation (XGM) effect of the semiconductor optical amplifier (SOA) are summarized and analyzed. An efficient extension method for the dynamic input range of the AOWC is proposed and a prototype system of long reach WDM/TDM hybrid passive optical network based on the AOWC is realized.(2) Operation principle and operation conditions for the colorless optical network unit (ONU) based on the reflective SOA (RSOA) are summarized and analyzed. The dynamic input range of the colorless ONU and the performance of the system transmission are experimental studied. The effections of chromatic dispersion, Rayleigh Backscattering (RB) and power losses are also analyzed.(3) An AOWC-based long reach WDM/TDM hybrid passive optical network is presented. An experimental system at 2.5Gbit/s and a simulation system are setup to help us to analyze the performance after the long reach transmission. An all-optical signal equalization module at 10Gbit/s is proposed for the practical applications.(4) An RSOA-based long reach WDM/TDM hybrid passive optical network is presented. The chromatic dispersion control and the loss compensation introduced by the long reach fiber transmission are analyzed. For avoiding the effection of the RB, the local seed light source is suggested.(5) A distributed access scheme is presented. Compared with the traditional long reach access schemes which usually have one access point, it can cover the area along the 80km feed fiber without blind zone. The access points can be flexibly inserted for supporting more users and providing more bandwidth.