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A multi-wavelength source is demonstrated in a cascaded-Raman fiber ring laser configuration using a tunable dual-section high birefringence fiber Sagnac loop filter. Depending on the pump powers and the cavity configurations, the source operates in the different wavelength regime between the 1120 and 1580 nm via cascaded Raman Stokes generation. The source generate up to 20 wavelength channels within...
In general, the propagation of light in a twisted, birefringent fiber evolves with a period and phase change non-linearly dependent on the initial polarization state. We show both analytically and numerically that a critical value for the ratio of twist rate to birefringence can be chosen so that the period and nonlinear phase change are no longer sensitive to the input polarization state. This makes...
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