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By Cox III C.H.

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The slope efficiency, sl , is a laser figure of merit that is used extensively in link modeling. This is simply the incremental slope of the P vs. I curve at a given laser bias current, IL , and is defined as sl (i L = IL ) = d pl . 5) 26 Link components and their small-signal electro-optic models The units of sl are W/A. Since sl is a contributing factor to the efficiency with which electrical modulation is converted to optical modulation, the higher sl , the better. The P vs. I curve, and corresponding slope efficiency, can be measured on the bare laser diode chip, and often is by device designers.

1994. Low-bias-current direct modulation up to 33 GHz in InGaAs/GaAs/AlGaAs pseudomorphic MQW ridge-waveguide devices, IEEE Photon. Technol. , 6, 1076–9. Seeds, A. J. 1996. Optical transmission of microwaves. In Review of Radio Science 1993–1996, ed. W. Ross Stone, Oxford: Oxford University Press, Chapter 14. Taylor, J. H. and Yates, H. W. 1957. Atmospheric transmission in the infrared, J. Opt. Soc. , 47, 223–6. Uitjens, A. G. W. and Kater, H. E. 1977. Receivers. In Electronics Designers’ Handbook, 2nd edition, ed.

In a laser we have light amplification by stimulated emission of radiation. Unlike the spontaneous processes just discussed, stimulated processes – emission and absorption – result in identical copies of the triggering event being produced. In stimulated emission of a photon, one photon triggers the emission of a second, identical photon. Thus one way to view stimulated emission is as a form of positive gain. An analogous statement holds for stimulated absorption, which results in negative gain or loss.

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