[IEEE 2008 IEEE 21st International Semiconductor Laser Conference (ISLC) - Sorrento, Italy (2008.09.14-2008.09.18)] 2008 IEEE 21st International Semiconductor Laser Conference - Reduced spectral linewidth (≪ 0.6 MHz) in L-band wavelength tunable DFB laser arrayHiroyuki Ishii, ; Kazuo Kasaya, ; Hiromi Oohashi, · 2008