Theoretical and Experimental Studies of Quantum Noise in Semiconductor Lasers

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9224604 Yariv This project wil investigate the fundamental noise properties of semiconductor lasers. The need for narrow bandwidth and frequency stabilized semiconductor lasers in coherent lightwave communication networks is crucial. For multi-channel distribution systems it is important that the laser frequency will be known exactly. In addition narrow laser linewidth increases the S/N ratio and the network's channel capacity. Narrow linewidth lasers are also needed for microwave links, precision spectroscopy, time and frequency standards and many other important applications. This research is motivated with the view of a significant, orders of magnitude, reduction of the quantum limited phase noise and increased frequency stability of the semiconductor laser. Another prospect is amplitude noise squeezing below the standard quantum noise limit. These important problems will be pursed using the concept of a semiconductor laser with dispersive loss. This work will continue and expand unfunded, exploratory studies in our group. The early results from these preliminary studies are promising. A subcontract to Professor Shevy at the University of Miami will contribute to the work on frequency stabilization and linewidth reduction ***