Intermodulation distortion in analog communication lasers

Theory of the intermodulation distortion in analog communication lasers (1993-95).

Principal collaborator: Vera Gorfinkel

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 fundamental 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 distortion brought about by the hot-carrier effects is near the tolerance limit for CATV systems.

Key papers: [ # 133.html ] [ # ]

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