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3 Journal of Telecommunications and Information Technology

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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.

Vertical cavity surface emitting lasers in radio over fiber applications

Marozsák T., Udvary E.

Journal of Telecommunications and Information Technology

2003

nr 1

36-40

Theoretical and experimental study of using direct modulated vertical cavity surface emitting lasers in radio over fiber applications is presented. The nonlinear distortion and signal to noise ratio are investigated and evaluated in case of short-range multi-carrier transmission. Nonlinear characterization and comparison of the different kind of semiconductor lasers are also presented.

Distortion and noise problems of subcarrier multiplexed optical systems

Udvary E., Marozsák T.

Journal of Telecommunications and Information Technology

2001

nr 4

60-64

In this paper investigation of subcarrier multiplexed optical subsystems for optically supported communication systems is presented. Noise and spurious free dynamic range are the main parameters, which are determined by the applied optical transmission. The frequency dependence of these parameters and optimal frequency chosen is presented.