50-Channel 100-GHz-Spaced Multiwavelength Fiber Lasers With Single-Frequency and Single-Polarization Operation

We demonstrate single-polarization operation of a distributed Fabry-Perot multiwavelength fiber laser by adding an external cavity with polarization-dependent feedback. We show that the laser lines retain single-frequency operation with the additional benefit of reduced linewidth. The laser source covers the full
C
-band with 100-GHz channel spacing.