The soliton laser1 is a novel mode-locked device employing a length of single mode fiber in its feedback loop. Its pulse width can be made to have any desired value, down to a small fraction of a picosecond, through choice of the fiber’s length. Operation is based on the ability of single mode fibers, in the region (λ> 1.3 µm) of negative group velocity dispersion, to support periodic soliton pulses, as well as to narrow broader pulses of the same energy.2,3 As the fiber is the all-important control element, pulse shape and width are largely independent of factors, such as details of gain dynamics, pump pulse width, etc., that are normally of prime importance in mode-locked lasers.