The authors report a structure for a polarisation insensitive amplifie
r at 1.55 mu m wavelength using 16 compensated strain InGaAsP/InGaAs q
uantum wells. A high gain of 27 dB for TE and TM modes has been obtain
ed. Polarisation sensitivity less than 1 dB over 85 nm bandwidth has b
een measured. These results are among the best reported.