Multiwavelength oscillation of an uncoated SOA-based fiber ring laser

We present a multiwavelength ring laser source using an uncoated semiconductor optical amplifier (SOA) for providing both gain as well as the comb-like filtering function in the cavity. A SOA-based ring laser source oscillates over a wide bandwidth range due to heterogeneous spectral broadening and the broad gain spectrum of the SOA. Multiwavelength operation can be obtained by inserting comb-like filters inside the cavity.