All-fiber Q-switched pulsewidth tunable erbium fiber laser using abrupt-tapered Mach-Zehnder filter

摘要

We demonstrate pulsewidth tunable Q-switched erbium fiber lasers using in-line high extinction ratio (> 30 dB) abrupt-tapered fiber Mach-Zehnder block filter and tunable Fabry-Perot filter in laser cavity. The pulsewidth can be tuning over 78ns~23ms.