UC Riverside

This dissertation is designed to focus on the field of nonlinear impairments generated along the fiber-optic transmission links in high spectral efficiency optical modulation systems, while also extracting the performance trade-offs of conventional and novel receivers. Fundamental knowledge of optical fiber, major phase modulation nonlinearities, and high spectral efficiency optical modulation and reception are discussed on an introductory level. Further, balanced detection schemes for optical duobinary with a comparison of differential phase shift keying (DPSK) are demonstrated and analyzed, both in simulations and experiments. Frequency discriminator receiver structures for quadrature phase shift keying (QPSK) as well as their linear and nonlinear noise properties are exhibited. At the end, polarization multiplexing QPSK with digital coherent receiver well known as future vision of fiber-optic communications is also simulatedly studied through the RZ- and NRZ- pulse shape impact in a 9-channel 100G wavelength division multiplexing (WDM) systems.