Discretely tunable SOA-fiber laser based on few-mode polarization maintaining fiber in Sagnac interferometer

A discretely tunable fiber ring laser based on a Sagnac interferometer incorporating a few-mode polarization maintaining fiber and semiconductor optical amplifier as the gain media is presented. Nine lasing wavelengths at a tuning step of 2.5 nm is achieved with side-mode suppression ratio over 20 dB.

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