LOW-COST 1.55-MU-M INGAASP-INP SPOT SIZE CONVERTED (SSC) LASER WITH CONVENTIONAL ACTIVE LAYERS

We report the realization of a low-cost 1.55-mu m spot size converted (SSC) laser using conventional SCH-MQW active layers, The laser consis ts of a rectangular gain section, a linear taper and a passive wavegui de. The lateral taper and the passive waveguide are fabricated on the same lower SCH layer, using conventional photolithography and RIE (rea ctive ion etching). The device exhibits low beam divergence of 6.6 deg rees x 10.9 degrees and -2.2-dB coupling loss with a cleaved single-mo de fiber, The l-dB alignment tolerance is +/- 2.15 mu m in vertical di rection and +/- 2.3 mu m in lateral direction, respectively.