A high power 1. 31 um AlGaInAs/InP strained layer multiquantum well distributed feedback (SL MQW DFB LD) with RWG structure has been developed by MOCVD technique. The maximum output power of chip was larger than 50 mW at 25℃
thresthod currents (Ith )were in the range of (13
2
0) mA
the front facet slope efficiency (Es) was higher than o. 45 mW/mA. Side mode suppression ratio (SMSR)exceeded 35 dB
Median to time failure at room temperature was larger than 3×105hour.