1.55-μm InGaAsP-InP spot-size-converted (SSC) laser with simple technological process

In this letter, we report the realization of a 1.55-/spl mu/m spot-size-converted (SSC) laser using conventional SCH-MQW active layers and conventional photolithography. The laser consists of a 300-/spl mu/m-long rectangular gain section, with compensated multiple-quantum-well (MQW) structure, and a 300-/spl mu/m-long tapered passive waveguide, fabricated on lower SCH layer. The device exhibits a beam divergence of 13/spl deg//spl times/18/spl deg/ and 3.5-dB coupling loss with a cleaved single-mode fiber (SMF). The 1-dB alignment tolerance is /spl plusmn/2.3 /spl mu/m in the vertical direction and /spl plusmn/1.9 /spl mu/m in the lateral direction, respectively.