Abstract

A waveband-tunable multiwavelength erbium-doped fiber laser based on a novel integrated structure of nonlinear polarization rotation and an unbalanced in-line Sagnac interferometer is proposed and demonstrated. An ultrabroadband lasing spectrum with 140 wavelength lasing peaks periodically distributed from 1563 to $1612.5\mathrm{nm}$ accompanied by a lasing linewidth of $0.112\mathrm{nm}$, a free spectral range (FSR) of $0.32\mathrm{nm}$, and a signal-to-noise ratio (SNR) of $20\mathrm{dB}$ has been achieved. A laser with high-wavelength lasing and waveband tunability was also achieved by merely adjusting the polarization controllers. The wavebands can be tuned from 1567 to $1606\mathrm{nm}$ continuously. Thirty-one lasing wavelengths in a $3\mathrm{dB}$ flattened spectrum has been achieved with a SNR of $48\mathrm{dB}$, a linewidth of $0.03\mathrm{nm}$, and a FSR of $0.32\mathrm{nm}$. Good stability of the laser operating at room temperature has been verified by using an optical spectrum analyzer to measure every 2 min for a half-hour.

© 2010 Optical Society of America

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