Abstract

A $10\mathrm{GHz}$ regeneratively mode-locked semiconductor optical amplifier fiber ring laser with a picosecond pulse duration was newly constructed, and the linewidth change of a longitudinal mode was measured for various laser cavity lengths using a delayed self-heterodyne detection method. The detected line shape was approximately Gaussian for cavity lengths of $3.4–171\mathrm{m}$. This result indicates that the laser linewidth depends strongly on thermal or acoustic cavity length fluctuations. The linewidth was proportional to the inverse square root of the cavity length, and a linewidth of $1.7\mathrm{kHz}$ was obtained for a cavity length of $171\mathrm{m}$.

© 2007 Optical Society of America

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