Frequency step-tunability is demonstrated in a hybrid fiber grating external cavity laser for the first time. This new configuration uses an in-fiber sampled Bragg grating (SBG) as the frequency selective element allowing the laser to be tuned by 100 GHz frequency steps from 1551.09 to 1556.66 nm. In this demonstration, the wavelength can be set to the eight strongest SBG reflection peaks giving a laser SMSR better than 25 dB and a linewidth of about 130 kHz.

© 1999 Optical Society of America

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