High Speed Multi-Channel Optical Router Design in Dense Wavelength Division Multiplexing (DWDM) Optical Networks
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In the era of information explosions, the size and complexity of data is expanding dramatically. To meet this requirement, lots of efforts have been made in both the time domain and the frequency domain. In the wireless communication area, the prevalent Time-Division Multiple-Access (TDMA) used in second generation global system for mobile communications (GSM) network is a good example of manipulating the signal in the time domain in order to share bandwidth over time. Orthogonal frequency-division multiplexing (OFDM) on the other hand, utilizes orthogonal sub-carrier signals to carry data on parallel data channels, achieving high spectrum efficiency. On the optical link side, the Dense Wavelength Division Multiplexing (DWDM) is a promising solution to meet the requirement. By multiplexing different carrier wavelengths onto one single strand of fiber, the link bandwidth can increase exponentially. But the all optical DWDM network is hard to utilize due to technology limitations. This dissertation aims at solving the current limitations on all-optical network from both switching technology and network architecture aspects. From the perspective of switching technologies, the DWDM Multi-Mode router provides an integrated platform to support three different switching technologies simultaneously. The dynamic reconfiguration capability in DWDM Multi-Mode enables the bandwidth sharing among three switching methods which increases the channel utilization. From the perspective of the applications, the Application-Aware (A2) optical network features the reverse data path reservation is a good candidate of asymmetric traffic transmission. By creating alternative switching technique towards optical switching network, the A2 optical scheduler eliminates the setup latency problem in traditional optical router. At the same time, the path reservation can be changed in real-time, increasing the probability of packets delivery. The 3-D switching opened another dimension in optical network to reduce traffic blocking. A dynamical resource allocation scheme is proposed to assign bandwidth for different traffic flows. The hardware experiments showed the feasibility of the proposed 3-D switching and it is expected to serve as a building block of future optical networks.