Abstract
We describe our design and fabrication of a low-loss and compact 1.5%-$\Delta$ silica-based
athermal arrayed waveguide grating (AWG) using a resin-filled groove. We present
the theory of athermal AWG design and clarify the relationship between the
AWG design parameters and the groove design required for realizing an athermal
condition. We also describe approaches for reducing excess loss in the groove,
which are used to optimize the groove and arrayed waveguide designs. We examine
the performance of a 40-channel 100 GHz spacing athermal AWG module that employs
all of the approaches. We successfully reduce the excess loss in the groove
to 0.2 dB and achieve a compact chip size of $31\times 23\ {\hbox{mm}}^{2}$ as well
as sufficient optical performance and temperature insensitivity for practical
use. In addition, we confirm by calculation that our approaches for excess
loss reduction are also effective for an athermal AWG with a channel spacing
of less than 100 GHz.
© 2009 IEEE
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