A polarisation insensitive GaInAsP near travelling wave semiconductor
laser amplifier is used as the nonlinear element in a nonlinear optica
l loop mirror. With this compact configuration, the authors demonstrat
e a continuously tunable switching window, and report, for the first t
ime using semiconductor materials, error ratio measurements for a demu
ltiplexing operation from 40 to 10 Gbit/s, with a receiver sensitivity
of -23 dBm.