High-power and narrow linewidth SOA-integrated DFB laser for 400-mW class external laser sources

We demonstrate an over 500 mW (at $45^{\circ} \mathrm{C}$) operation of $1.3 \mu \mathrm{~m}$ SOA-integrated DFB laser with reduced thermal resistance. The device exhibits single-mode operation with SMSR of over 50dB and narrow linewidth below 200 kHz.