SEMICONDUCTOR LASER AMPLIFIERS

摘要

A semiconductor laser amplifier includes both a waveguide layer (3) and an active layer (4). In use, an optical wave in the active layer (4) interacts with the waveguiding layer to reduce the polarisation sensitivity of the amplifier. A short, thick active layer is not required, typical dimensions being 250 or 500 .mu.m long, by 0.2 .mu.m high. The mesa (15) is typically about 2 .mu.m wide, but may be wider.