Multiwavelength laterally complex coupled distributed feedback laser arrays with monolithically integrated combiner fabricated by focused-ion-beam lithography

A multiwavelength laser array with four complex coupled distributed feedbac k lasers was fabricated by focused-ion-beam lithography. The laser array wa s monolithically integrated with a combiner network to allow simultaneous o peration and coupling of four wavelengths into one single-mode fiber. To re duce the fabrication complexity, focused-ion-beam technology was used to de fine complex coupled gratings lateral to pumped ridge waveguide sections wi thout any further overgrowth step. A four wavelength output with 6-nm-wavel ength spacing and side-mode suppression ratios of more than 35 dB were obta ined with output powers up to 6 mW per channel. (C) 2001 American Institute of Physics.