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Enhancement in electroabsorption waveguide modulator slope efficiency at high optical power

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6 Author(s)
Welstand, R.B. ; Dept. of Electr. & Comput. Eng., California Univ., San Diego, La Jolla, CA, USA ; Pappert, S.A. ; Nichols, D.T. ; Lembo, L.J.
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An increase in transfer curve slope efficiency for a Franz-Keldysh effect InGaAsP-InP electroabsorption waveguide modulator is observed as the incident optical power is increased from 5.8 to 17 dBm. However, high-frequency RF measurements agree with the gain predicted from the low-power transfer curve at all optical powers. We attribute the increase in dc slope efficiency to a temperature-induced bandgap shrinkage of the electroabsorption material.

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Photonics Technology Letters, IEEE  (Volume:10 ,  Issue: 7 )