Second-order distortions in CATV distributed feedback (DFB) laser diodes

Jean-Christophe Froidure; Christophe Lebrun; Patrice Megret; Emmanuel Jaunart; P. Goerg; T. Tasia; M. Lamquin; Michel Blondel

doi:10.1117/12.201977

22 February 1995 Second-order distortions in CATV distributed feedback (DFB) laser diodes

Jean-Christophe Froidure, Christophe Lebrun, Patrice Megret, Emmanuel Jaunart, P. Goerg, T. Tasia, M. Lamquin, Michel Blondel

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Proceedings Volume 2449, Fiber Optic Network Components; (1995) https://doi.org/10.1117/12.201977
Event: Advanced Networks and Services, 1995, Amsterdam, Netherlands

Abstract

Calculation of distortion performances of a given DFB laser for different frequency plans is a well-known problem when working with CATV AM-VSB optical links. One generally takes safety margins or performs measurements on the lasers with the requested frequency plans when it is possible. After investigating the most important theories proposed in the scientific literature, we have come to the conclusion that laser distortion can be described as the weighted contribution of two different distortion sources: leakage current and intrinsic distortion due to the laser oscillation mechanism itself. On the basis of the two preceding ideas we predict the evolution of the second-order two-tone intermodulation (IMD2) response as a function of frequency and operating point by cascading Volterra models of the laser leakage currents and rate equations. The total composite second order (CSO) distortion can then be predicted with a `10.log' adding law and compared to distortion measurements. Regarding the experimental set-up, the optical modulation depth per channel has to be properly chosen in order to minimize the influence of optical reflections and reduce the clipping effects.

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Jean-Christophe Froidure, Christophe Lebrun, Patrice Megret, Emmanuel Jaunart, P. Goerg, T. Tasia, M. Lamquin, and Michel Blondel "Second-order distortions in CATV distributed feedback (DFB) laser diodes", Proc. SPIE 2449, Fiber Optic Network Components, (22 February 1995); https://doi.org/10.1117/12.201977

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KEYWORDS

Modulation

Semiconductor lasers

Channel projecting optics

Active optics

Information operations

Intermodulation

Solids

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