Abstract

High-power 1480-nm lasers operating in the fundamental lateral mode are attractive candidates for erbium doped fiber amplifier (EDFA) and Raman amplifiers. Several approaches have been reported to improve output optical power ¹⁻³. A significant problem is the degraded slope efficiency with increased cavity length. Reduction of internal loss is very effective to overcome this degradation which is caused by inter valence band absorption (IVBA) in the p-cladding layer. We have proposed adoption of an asymmetric cladding layer structure to decrease internal optical loss caused by IVBA in the p-cladding layer. ⁴ In this work we demonstrate that asymmetric cladding LD achieved the excellent fiber coupling efficiency of 92 % and single-mode fiber output power of 1W.

© 2003 Optical Society of America