MODE SHIFT OR CONTINUOUS ELECTROOPTIC-CON NECTABLE LASER-DIODE

We report an electrooptically tunable, single frequency extended cavit y laser diode operating at 1 500 nm wavelength. The method is very sim ple since only three components are used to obtain both mode hopping a nd continuous tuning. A LiNbO3 crystal acts as a tunable wavelength fi lter and leads to mode hopping tuning. Continuous tuning is obtained b y phase modulation with a second LiNbO3 crystal. The linewidth is less than 250 kHz and the tuning rates are 660 MHz/V for mode hopping and 45 kHz/V for continuous tuning. The principle of operation and the exp erimental results are discussed.