| Optical Wavelength Division Multiplexing (WDM) is a promising technology that provides an incredible amount of bandwidth to meet future bandwidth needs to support emerging applications. As WDM technology evolves, there is a strong need to design and develop network architectures and algorithms that leverage the benefits of WDM capabilities. This dissertation addresses network design issues and develops algorithms to provide improved performance in legacy fixed grid and next generation flexible grid networks.;In fixed grid WDM networks, algorithms to design impairment-aware translucent networks are developed in which impairments are addressed through combined placement of traffic grooming and OEO 3R regenerators. The dependencies of grooming equipment and 3R regenerator placement on provisioning survivable lightpaths are evaluated, and algorithms for shared and dedicated lightpath-level protections are proposed. To improve the cost and energy efficiencies in WDM networks, OEO 3R regenerators can be replaced by all-optical 2R regenerators. An optimal algorithm for combined placement of all-optical 2R and OEO 3R regenerators is developed to address impairments along the predefined lightpaths. Algorithms to route and schedule bandwidth-varying scheduled-traffic demands over fixed grid networks are developed and analyzed through simulations.;To incorporate flexibility and intelligence in WDM networks, a Flexible Optical WDM (FWDM) network architecture is proposed, which consists of flexible grid transmission technologies and colorless, directionless, and contentionless switching technologies. In FWDM networks, algorithms for static and dynamic lightpath establishment are developed, and to evaluate the performance of the algorithms, a lower bound and analytical models are developed. Dynamic traffic in FWDM networks may lead to a serious spectral fragmentation issue that may degrade the network performance. To address this issue, a wavelength convertible FWDM network architecture is introduced and an effective algorithm is designed. To improve the spectral efficiency of FWDM networks, optical and electronic layer traffic grooming architectures are proposed, and algorithms are developed to design traffic grooming capable FWDM networks. Finally, algorithms for provisioning dedicated and shared protection in FWDM networks are designed.;In general, this dissertation proposes several architectures and algorithms for fixed and flexible grid WDM networks that address near and far term network challenges. |
