Abstract
We report the fabrication of widely tunable ridge waveguide distributed Bragg
reflector (DBR) lasers with InGaAsP butt-joint as grating material. The shape of the
butt-joint interface is found to have significant effect on the properties of the
lasers. It is shown that irregular mode jumps during wavelength tuning can be
avoided by a V-shaped butt-joint interface. From the fabricated device, 23 channels
with 0.8 nm spacing and greater than 35 dB side mode suppression ratios are
obtained. The different tuning characteristics of the ridge waveguide and the
previously reported buried ridge stripe DBR lasers are discussed. Combined with the
wide tuning range and the simple structure, the ridge waveguide DBR lasers are
promising for use in wavelength division multiplexing passive optical networks
(WDM-PONs).
© 2014 Chinese Optics Letters
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