Semiconductor optical amplifier based multi-wavelength lasers in 0.4 nm channel spacing

Abstract

We propose a multi-wavelength fiber laser employing a double-pass Mach–Zehnder interferometer filter, a piece of polarization maintaining fiber, a semiconductor optical amplifier and an optical isolator. The proposed fiber laser has the advantages of stable multi-wavelength lasing with 33 channels in standard wavelength division multiplexing channel spacing of 0.4 nm using 15 m polarization maintaining fiber. Power ripple among channels could be reduced by increasing the bias current of the semiconductor optical amplifier.