More than 11mW output powers for all wavelengths from the fiber and over 49 nm range tuning in sampled
grating distributed Bragg reflector laser with an integrated semiconductor optical amplifier which is enabling
access to 110 ITU 50GHz channels is demonstrated. Tilted amplifier and anti-reflection facet coating are
used to suppress reflection.
In this paper, a simple wavelength-locking scheme for a tunable distributed Bragg reflector laser is presented. A 1*2
wide band fiber coupler as the function of beam splitter forms two optical paths with evenly separated power, one for
wavelength monitoring and the other for power reference. For wavelength monitoring, two single mode fiber
collimators- one as a transmitter and the other as a receiver-form a collimated light path for laser beam and a highly
stable air-paced Etalon inserted between them is used as an optical frequency discriminator to lock the laser wavelengths
to several ITU channels maintain 100GHz or 0.8 nm channel spacing in C band. Meanwhile, a photodetector connected
with receiving collimator by a FC/PC connector turns the optical signal into electronic signal. For power reference, one
of the coupler output pots is directly connected with a similar photodetector. Then wavelength shifting signal
proportional to the power differences between two optical paths could be feed backed to the phase region or DBR region
for stabilizing the laser output wavelength.
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