KEYWORDS: Homodyne detection, Signal to noise ratio, Semiconductor lasers, Receivers, Signal detection, Laser optics, Systems modeling, Mode locking, Laser systems engineering, Transmitters
High detection sensitivity and large multi-user interference rejection are key requirements to accommodate a higher
number of users in an optical coherent CDMA system. In this work, we propose efficient coherent homodyne receiver
system configurations, as well as, demonstrate experimentally the performance of coherent homodyne pulse detection
using a synchronized modelocked semiconductor laser system. We present the significant improvement of coherent gain
and signal-to-noise ratio of the NRZ ASK format modulated PRBS data detection compared with direct detection.
We study the characteristics of wavelength tunable quantum-dot mode-locked lasers using a curved two-section device, external grating, and optical bandpass filter. Wide wavelength tunability is demonstrated due to the fact that the center wavelength of mode-locking is extended to excited state transitions as well as ground state transitions of the quantum-dot gain media.
Quantum-dot lasers have shown remarkable properties, such as temperature-insensitive operation, low loss, efficient
carrier recombination, ultrafast gain recovery time, suppression of beam filamentation, reduced sensitivity to optical
feedback, etc. These excellent performances will contribute to open new cost effective and improved lightwave
communication systems. We exploit the performance of mode-locking of quantum-dot lasers for ultrashort, high power,
and low noise optical pulse generation using two-section mode-locked laser diodes and a semiconductor optical
amplifier (SOA)-based ring laser cavity.
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