SOA-Based Triple-Wavelength Ring Laser

We propose and experimentally demonstrate a triple-wavelength fiber ring laser using a semiconductor optical amplifier (SOA) in conjunction with an array waveguide grating (AWG). The experimental results show three lasing lines with an adjustable wavelength separation and a large optical signal-to-noise ratio under room temperature. The three channels operate at 1531.5 nm, 1532.3 nm and 1533.1 nm with a peak power above -23 dBm and optical signal to noise ratio above 30 dB at SOA drive current of 350 mA. By changing the ports of the AWG, the center wavelengths of the triple lasing lines can be changed and the wavelength separation between the lasing lines can also be changed. The proposed laser configuration has the advantages of a simple and compact structure, quad-wavelength operation and the system can be upgraded to generate more wavelengths.