An improved semiconductor optical amplifier with shortened gain-recovery time is disclosed. In the inventive device a carrier-storage region is placed adjacent to the gain region of the amplifier. Passage of carriers from the storage region to the gain region rapidly replenishes the carrier population...http://www.google.de/patents/US4939474?utm_source=gb-gplus-sharePatent US4939474 - Semiconductor optical amplifier with shortened gain recovery time
