To generate a broadband light source by using mutually injection-locked Fabry-Perot laser diodes

We propose and demonstrate a type of broadband light source (BLS) based on mutually injection-locked Fabry-Perot laser diodes (F-P LDs). By mutually injection-locked F-P LDs, we realized a BLS with flatness and multimode output spectrum. The proposed BLS generates a 100 GHz spaced optical frequency comb with fifteen modes, ranging from 1532 to 1544 nm with a flatness of < 4dB. Consequently, the mutually injection-locked F-P LDs light source could be relatively simple and cost-effective compared with other demonstrated light source schemes.