抄録
Wavelength tunable semiconductor lasers, operating at 1.3-1.5 μm wavelength region, are reviewed. The structures are classified to hybrid type tunable lasers and monolithic type tunable lasers. More than 1000 Å wavelength tuning was attained in a hybrid type tunable laser with an external grating mirror, and 100 Å tunable range for monolithic type 3-section tunable distributed feedback laser diode.
