120 /spl deg/C operation of 10 Gbps direct modulated 1.3 /spl mu/m AlGaInAs-MQW DFB laser diodes

1.3 /spl mu/m AlGaInAs-MQW ridge waveguide DFB-LDs with a buried grating close to active layer in n-cladding layer was developed. The light output power over 5 mW and clear eye opening with no mask hits for OC-192 under 10 Gbps direct modulation have been realized from 25 /spl deg/C to 120 /spl deg/C. The stable operation over 1600 hours under the APC mode of 10 mW at 95 /spl deg/C has been confirmed.