Sharp heavy-hole and light-hole excitons are clearly observed in InGaAs/InAlAs multiple-quantum-well (MQW) structures at temperatures ranging from minus 190 degree C to 70 degree C. The halfwidth of the heavy-hole exciton line is as narrow as 6. 2 mev at room temperature. InGaAs/InAlAs MQWs are prepared in a PIN doped configuration by molecular beam epitaxy. An enhanced electroabsorption effect is also clearly observed in long-wavelength-region MQWs.