Abstract
In this paper, we present and investigate a new architecture of a silicon photonic transponder
aggregator as a new interconnect subsystem enabling the implementation of colorless, directionless, and contentionless
ROADMs. Such subsystem is based on a microring resonator switching fabric integrated in a silicon photonics platform
to achieve high functional integration together with reduction of cost, footprint, and power consumption. In the
proposed device, microring resonators perform simultaneous add and drop of wavelength channels which suffer from two
detrimental effects: residual dropped signal crosstalk and residual added signal crosstalk, respectively. Considering
three microring-based switching elements, the transfer matrix method has been used to compute the add/drop transfer
functions of the switches as a function of their geometrical parameters. The two crosstalk effects have been evaluated
jointly with other important transmission parameters, such as bandwidth, insertion losses, side lobe suppression,
adjacent channel rejection, extinction ratio, and group dispersion. In addition, device sensitivity with respect to
the ring-waveguide coupling coefficients has been calculated. Finally, the performance of the different switches has
been assessed to demonstrate that, by a proper design, the proposed transponder aggregator can support 100 Gb/s
DP-QPSK modulated signal transmission.
© 2013 IEEE
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