Fiber lasers are versatile low-cost sources that are attractive for a wide range of applications. In continuouswave mode, tunable and multiwavelength laser sources are required for wavelength division multiplexing (WDM), fiber sensors and optical instrument calibration, for example. On the other hand, passively Qswitched and mode-locked fiber lasers, operating in pulsed mode, make it possible to reach values of peak power much higher than their continuous-wave counterparts, allowing the use of these sources for studying and exploiting nonlinear effects in fibers, a framework in which supercontinuum generation is now receiving particular attention.