ELECTROABSORPTION OF INASP-INP STRAINED MULTIPLE-QUANTUM WELLS FOR 1.3 MU-M WAVE-GUIDE MODULATORS

We report the electroabsorption property of InAsP/InP strained multiple quantum wells (MQWs), grown by gas-source molecular beam epitaxy, for 1.3 mum modulator applications. Very sharp excitonic absorption at room temperature was observed. Electroabsorption measurements performed for a ring-shaped p-i-n diode, consisting of 10-period InAs0.41P0.59(100 angstrom)/InP(150 angstrom) strained MQWs, reveal a significant red shift of the absorption peak with increasing reverse biases due to the quantum-confined Stark effect. This large energy shift (e.g., approximately 18 meV at an external field of 57 kV/em) is well accounted for in the ''effective well-width'' model. The change of the absorption coefficient at a 22 meV detuning is as large as 3510 cm-1 with a small residual absorption, which can be very useful for 1.3 mum waveguide modulators.