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All-optical intensity noise suppression for solid-state and semiconductor lasers

Csörnyei M., Berceli T., Marozsák T.

Journal of Telecommunications and Information Technology

2005

nr 2

65-70

This paper will report on a new all-optical technique of relative intensity noise (RIN) suppression for solidstate and semiconductor lasers. The new scheme we have used is based on an unbalanced Mach-Zehnder interferometer (UMZI), which is able to cancel the intensity noise enhancement at relaxation resonance. Although the relaxation oscillations frequency and the level of the corresponding noise maximum are extremely different concerning solid-state microchip lasers and semiconductor laser diodes, the proposed passive noise suppression is well suited for both types of laser sources used in telecommunication. The UMZ fiber interferometer solution for solid-state lasers demonstrated hereunder was generalized and deployed in case of semiconductor lasers as well.

Strongly nonlinear feedback technique for significant phase noise suppression at microwave harmonic oscillators

Bánký T., Zólomy A., Berceli T.

Kwartalnik Elektroniki i Telekomunikacji

2004

Vol. 50, z. 4

567-578

Calculations are presented to study the phase noise suppression effects of an additionally introduced highly nonlinear feedback loop in microwave harmonic oscillators. Calculations are done for determining the optimal structure and parameter set of nonlinearly feedbacked harmonic oscillators, with respect to the effects of the nonlinear properties on the behavior of the phase noise characteristics. Using the calculated analytical form 6dB of phase noise suppression was achieved. Experiments have been also performed on a practical setup, specifically on an opto-electronic oscillator structure operating with high harmonic levels. Measurement and simulation results for confirming our theoretical principles are also reported.