Abstract
We demonstrate a 400-wavelength Raman comb lasing based on the nonlinear polarization rotation (NPR) in a ring cavity with high-birefringence fiber loop mirror (HBFLM). The comb-line intensities are equalized by the NPR mechanism. As the length of polarization-maintaining fiber (PMF) in the HBFLM is changed from 5.4 to 120m, the line spacing varies from 1.17 to 0.0533nm and the 10dB spectral bandwidth is kept at the similar level. In case of a 120m long PMF, more than 400 wavelengths with the signal-noise ratio higher than 10dB are obtained in the 10dB bandwidth of 22.4nm.
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