Paper 133 Abstract

IEEE Journal of Quantum Electronics 32, pp. 1995-2003 (1996)

Fundamental limits for linearity of CATV lasers

Vera Gorfinkel(a) and Serge Luryi(b)

(a)Department of High Frequency Engineering
University of Kassel, D-34121, Germany

(b)AT&T Bell Laboratories
Murray Hill, NJ 07974-0636


We have considered nonlinear distortions in a subcarrier multiplexed optical transmission system arising from carrier heating effects in the source laser. We included two sources of carrier heating: free-carrier absorption of the coherent radiation in the cavity and the power flux into the active layer, associated with the input current. Resulting from the very existence of modulated optical and electrical signals these effects cannot be avoided in any laser structure. Simple analytic expressions have been derived for the intermodulation distortion in multi-channel single-mode lasers. For an 80-channel 60-540 MHz system with 3% optical modulation depth per channel, the composite second order (CSO) distortion brought about by the hot-carrier effects is near the tolerance limit for CATV systems.

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At this time both authors are with

Department of Electrical Engineering
State University of New York at Stony Brook
Stony Brook, NY 11794-2350

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