Author: Lau, Kwan-chi
Title: Multicasting in wavelength division multiplexed optical communication systems based on Raman-assisted four-wave mixing in dispersion-shifted fiber
Degree: Eng.D.
Year: 2008
Subject: Hong Kong Polytechnic University -- Dissertations.
Wavelength division multiplexing.
Multicasting (Computer networks)
Optical communications.
Department: Department of Electronic and Information Engineering
Pages: xviii, 191 leaves : ill. (some col.) ; 30 cm.
Language: English
Abstract: Dense wavelength division multiplexing (DWDM) transmission systems have been widely deployed in the Internet Infrastructure over the last 10 years or so. The state-of-art DWDM nowadays can provide up to 64 channels at 40 Gbps and it is just getting faster. However processing in electrical domain at such high speed could be extremely complex and expensive. The alternative is to keep processing in optical domain to eliminate the O-E-O conversion at lower layers to simplify the network architecture to reduce the cost and increase the speed. All-Optical Multicast is good for one-to-many and many-to-many communication networks. It is important because a lot of future multicast broadband applications such as video conferencing and high definition (HD) Internet TV can be realized without the need for O-E-O conversion at the lower layers over the DWDM optical communication system. Optical multicast on data plane (or Multiple Wavelength Conversion) can be done simply by using splitter-and-delivery (SAD) switch consists of optical power splitters and amplifiers. However using such method to build a Multicast Capable Optical Cross Connect (MC-OXC) is complex and expensive. Meanwhile optical multicast on data plane was also proposed and demonstrated using various techniques. These include non-linear SOA-based interferometer, injection locking of Fabry-Perot laser diodes, cross phase modulation in a dispersion-shifted fiber (DSF), pulsed-pump fiber optical parametric amplifier, cross gain modulation in a fiber optical parametric amplifier and four wave mixing (FWM) in DSF. However the proposed multicast schemes are designed for fixed multicast on the data plane. They are not reconfigurable and inefficient to change the multicast group members with control information from control plane. In an Internet Protocol (IP) network such as Internet with multicast switches, group membership protocol and multicast routing protocol are used to support IP multicasting across the IP network. This allows the switch to send data only to the hosts that belong to a particular group. To map the control information of these protocols to the data plane lightpath connections, optical multicast switches need to be reconfigurable based on the control plane information. It was indirectly demonstrated for 3 controllable multicast channels. No controllable optical multipath switch of more than 3 channels however has been demonstrated up to now. In this thesis, we propose a multicast scheme based on Raman-assisted FWM in a DSF for its high on-off gain and wide bandwidth of operation to demonstrate an all-optical multicast switch experimentally for DWDM optical communication system. At the best of my knowledge we are the first to demonstrate experimentally an all optical reconfigurable multicast switch which is capable to select multicast channel group at data plane with control plane information. The multicast switch we have demonstrated is capable to select SIX multicast channels and FIVE configurable groups by using THREE wavelength controls. Numerical simulation using VPI (version 6.5) was also carried out to design and evaluate the proposed system. The simulation result shows that the switch may operate at higher data rate and it may be expandable up to 10 multicast channels.
Rights: All rights reserved
Access: restricted access

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