A distributed feedback (DFB) laser in LiNbO 3 is demonstrated using a Ti: Fe: Er: LiNbO 3
waveguide with a holographically written photorefractive grating. The DFB laser was
combined with a waveguide amplifier on the same substrate. Up to 1.12 mW of output power
at λ= 1531.35 nm was emitted by the laser/amplifier combination at a pump power level of
240 mW (λ P= 1480 nm). The emission spectrum consists of the two lowest-order DFB
modes of about 3.9 GHz frequency spacing. Whereas the measured threshold gain of∼ 3.3 …