Abstract
The extension of optical add/drop multiplexing (OADM) systems to metro-core
and metro-access networks has led to the need for economical and compact OADM
devices. In this paper, we demonstrate a 1-in.<sup>2</sup> 100 GHz spacing 40-channel (ch) single-chip
variable attenuator multiplexer/demultiplexer based on a monolithic 2.5%-Δ silica planar
lightwave circuit (PLC) and stacked photodiode arrays. We also investigate
the particular issues raised by monolithic integration with such high Δ waveguides.
One is the loss increase caused by high index contrast of the waveguides.
Performance fluctuation and thermal interference between the integrated circuits
are also inherent issues. By utilizing effective solutions, we have successfully
overcome such problems and confirmed that a 2.5%-Δ silica PLC is effective for use
in monolithic integration.
© 2009 US
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