Intervalence band absorption coefficient measurements in bulk layer, strained and unstrained multiquantum well 1.55 μm semiconductor lasers

Measurements are reported of intervalence band absorption (IVBA) coefficient k0 in three types of active layer structure: bulk, unstrained (MQW) and strained multiquantum wells. The IVBA measurements are performed by observing the spontaneous emission from the uncleaved facets of DCPBH Fabry-Perot lasers. k0 = (3.7 ± 0.3) × 10−17 cm2 is obtained for bulk, (1.4 ± 0.2) × 10−16 cm2 for MQW unstrained and (3.5 ± 0.3) × 10−17 cm2 for strained MQW structures.