| This dissertation studies the impact of alternative modulation formats on the design of transparent optical metropolitan-area networks where an optimal modulation format which is more tolerant to linear and nonlinear impairments is needed. Design trade-offs such as modulation complexity vs. amplifier spacing will be studied by simulating the Q penalties for optical-layer impairments. This work is completed with the presentation of some new modulation formats, e.g. modified CSRZ-DPSK, alternate polarization CSRZ-DPSK, alternate polarization modified CSRZ-DPSK, which provide better nonlinear tolerance and increase the transmission distance. This work in both Q penalties and advanced modulation formats will provide a foundation for future research. |
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