Chirp parameter of electroabsorption modulators with InGaAsP intrastep quantum wells

Abstract

The chirp parameter of electroabsorption modulators (EAMs) with intrastep quantum wells (IQWs) based oil the InGaAsP material system is investigated theoretically. The chirp parameter of the IQW EAM, calculated by using the Krarners-Kronig relation, shows a discontinuity at a low voltage due to the blue shift in transition energy. Once the red shift is initiated, the chirp of the IQW EAM is similar to that of the conventional quantum-well (QW) EAM. Comparison with the conventional QW EAM shows that the IQW EAM could still be operated under high optical power without the compromise in chirp and absorption loss.