Abstract
In a previous work, we showed that an adequate choice of phase shifts
introduced by defects in a laterally coupled distributed feedback laser (LC-DFB)
structure can lead to improved performance. In this paper, we change that
optimized structure by adding an in-plane back mirror to the structure, funneling
light in only one direction into a single-mode waveguide. We show that a well
designed circular grating considerably reduces lateral radiation losses in
the back mirror, concentrating light in the front end of the device. We also
examine the possibility of converting the in-plane emission at the front end
of the device into vertical emission by placing a higher-order grating. Furthermore,
we show that side mode suppression ratio (SMSR) of the device can be improved
by incorporating a nanotaper.
© 2009 IEEE
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