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Extinction ratio of stripe-geometry DH AlGaAs lasers with "soft" turn-on

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1 Author(s)
Chen, Y.C. ; Optical Information Systems, Exxon Enterprises, Elmsford, NY, USA

The effect of high spontaneous emission on the extinction ratio of modulated laser-diode signals is discussed. A calculation based on the spectra taken from oxide-defined narrow-stripe lasers at `on' and `off' levels shows that high spontaneous emission at the `on' level can degrade the apparent extinction ratio of the source, due to material dispersion in optical fibers, and affect transmission bandwidth and useful device lifetime.

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Quantum Electronics, IEEE Journal of  (Volume:17 ,  Issue: 12 )