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This paper presents experimental results on a 70-nm-wide, quasi-continuously tunable, single-longitudinalmode erbium-doped fiber (EDF) laser. The cavity incorporates three tunable band-pass filters; a bulk grating based tunable band-pass filter, a fiber-ring-cavity filter, and an auto-tracking saturable absorption induced grating filter generated by an un-pumped EDF. In our experiment, this laser produced a single longitudinal mode oscillation between 1510 nm and 1580 nm, an output power of 0.5 mW and a tuning step of less than 0.2 pm. Optical frequency jitter was less than 0.8 pm and the signal to source spontaneous emission ratio (S/SSE) was higher than 60 dB. A tunable single-longitudinal-mode L-band fiber laser will also be discussed in this paper.

We report PMD effect on the distributed chromatic dispersion map measurement based on phasemismatched four-wave mixing. The experimental results of distributed chromatic dispersion maps for a low-PMD dispersion-shifted fiber are described with spatial resolution of 250 m and dispersion accuracy less than ±0.02 ps/nm.km. For high-PMD DSF fibers, the chromatic dispersion map may be difficult to determine if the fiber has a long polarization-coupling length; however, it is still possible to be measured for a low polarization-coupling length fiber. Finally, the use of this method to determine distributed nonlinear coefficient will also be discussed.