[IEEE LEOS 1992 Summer Topical Meeting Digest on Broadband Analog and Digital Optoelectronics, Optical Multiple Access Networks, Integrated Optoelectronics, and Smart Pixels - Newport, RI, USA (21-24 April 1992)] LEOS 1992 Summer Topical Meeting Digest on Broadband Analog and Digital Optoelectronics, Optical Multiple Access Networks, Integrated Optoelectronics, and Smart Pixels - Measurement of valence band edge discontinuity for the InAlAs/GaAsSb heterojunction lattice-matched to InP