Abstract

A novel multiwavelength Raman fiber laser based on the mixed-cascaded Stokes effects of phosphosilicate fiber is proposed and demonstrated experimentally. By using stimulated Raman scattering of both ${\mathrm{P}}_2{\mathrm{O}}_5$ and $\mathrm{Si}{\mathrm{O}}_2$ along $1\mathrm{km}$ phosphosilicate fiber pumped with a $1064\mathrm{nm}$ double-clad fiber laser, the mixed-cascaded Raman linear cavity is formed by a pair of fiber Bragg gratings at $1239\mathrm{nm}$, a polarization-maintaining fiber (PMF) Sagnac loop filter, and a conventional optical loop mirror. Up to 15-wavelength stable oscillations around $1320\mathrm{nm}$ are obtained with a wavelength spacing of $0.44\mathrm{nm}$ and power nonuniformity of less than $4\mathrm{dB}$. By changing the length of the PMF in the Sagnac loop filter from $10\text{to}5.5\mathrm{m}$, the wavelength spacing is adjustable from $0.44\text{to}0.8\mathrm{nm}$. The extinction ratio of the laser is more than $30\mathrm{dB}$. Excellent stability is also observed with a peak power fluctuation of less than $0.8\mathrm{dB}$ in $1\mathrm{h}$.

© 2008 Optical Society of America

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