\input zb-basic \input zb-ioport \iteman{io-port 06069149} \itemau{Singh, Surinder; Garg, Meenakshi} \itemti{Contention detection and minimization in all optical routers.} \itemso{Thilagam, P. Santhi (ed.) et al., Advanced computing, networking and security. International conference, ADCONS 2011, Surathkal, India, December 16--18, 2011. Revised selected papers. Berlin: Springer (ISBN 978-3-642-29279-8/pbk). Lecture Notes in Computer Science 7135, 426-434 (2012).} \itemab Summary: By using nonlinearity characteristics of semiconductor optical amplifier, an all-optical half-adder is demonstrated for contention detection and minimization at 1 Gb/s. The half adder based on XGM and FWM of SOA. Contention detection subsystem provides all the necessary control signals. The state of contention minimization system is controlled by these signals. \itemrv{~} \itemcc{} \itemut{all-optical signal processing; all-optical logic; semiconductor optical amplifier; contention detection and minimization} \itemli{doi:10.1007/978-3-642-29280-4\_50} \end