Design, realization, and characterization of a ten-wavelength monolithic source for WDM applications integrating DBR lasers with a PHASAR

We present here the design, fabrication, and static as well as dynamic char acteristics of a ten-wavelength, 200-GHz channel spacing emitter for wavele ngth-division multiplexing applications. The source is based on the monolit hic integration on InP of a ten distributed Bragg reflector laser array wit h a square-shaped transmission response PHASAR, The specific design of the PHASAR is detailed. The continuous-wave operation-one channel at a time-dem onstrates a high monomode stability with a rejection better than 32 dB for all channels and all injected currents; the 200-GHz channel spacing can be reached with an accuracy better than 25 GHz. High-speed characteristics dem onstrate a 6.5-GHz direct modulation bandwidth at -3 dB for a 70-mA current in the 900-mu m-long active section. The chirp measured for a 2.5-Gb/s mod ulation with a 10-dB extinction ratio is less than 1.5 Angstrom for every w avelength.