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179 p. Due to the ever-increasing capacity requirement for communication networks, the number of wavelength-division multiplexing (WDM) channels and channel bit rate continue to increase in optical transmission systems. As a result, WDM channel spacing has to be reduced in order to accommodate more channels with higher bit rates, which in turn increases the impact of transmission impairments of optical fiber systems. These impairments include optical amplifier noise, group-velocity-dispersion (GVD), polarization-mode-dispersion (PMD), nonlinear effects such as self-phasemodulation (SPM), cross-phase-modulation (XPM), and four-wave-mixing (FWM), as well as their interaction with dispersion. These impairments may ultimately limit the distance capacity product of an optical transmission system. One technology that could improve the system performance under such impairments is to use advanced modulation formats rather than the conventional non-return-to-zero on-off-keying (NRZ-OOK). DOCTOR OF PHILOSOPHY (EEE)

To extend transmission distance using cascaded in-line semiconductor optical amplifiers (SOAs) and differential phase-shift-keying modulation format, optimal operation conditions for SOAs, such as input power and operation current, are studied. 16/spl times/10.709-Gb/s wavelength-division-multiplexing transmission over 640-km SSMF with the optimal system design parameters is demonstrated. This is, to the best of our knowledge, the largest bit-rate distance product reported.

Advanced InP technology is the enabling technology to achieve monolithic integrated 300-pin MSA compatible 43 Gb/s (RZ-)DQPSK transponder module with high performance. The integrated platform offers footprint, power, and cost reduction for next generation products.

Advanced InP technology is the enabling technology to achieve monolithic integrated 300-pin MSA compatible 43 Gb/s (RZ-)DQPSK transponder module with high performance. The integrated platform offers footprint, power, and cost reduction for next generation products.

DSDBR laser platform is enabling a comprehensive range of tunable products which are fuelling the drive towards flexible, wavelength agile networks. Laser/Modulator integrated platforms offer further footprint, power, and cost reduction for next generation products.

This paper examines the optimum optical and electrical filter bandwidths of the optical MSK receiver. Results show that the MSK signal with low OSNR exhibits narrower optimal optical filter bandwidth compared with RZ-DPSK and RZ-OOK.

Detailed principle for optical MSK generation and detection is presented. 10.7 Gb/s MSK data is transmitted and its dispersion tolerance is compared with that of RZ-DPSK and RZ-OOK. Results show that MSK exhibits better tolerance than other two formats.