A Temperature-Insensitive Third-Order Coupled-Resonator Filter for On-Chip Terabit/s Optical Interconnects
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Abstract
We design and demonstrate a temperature-insensitive
third-order coupled-resonator filter in the silicon-on-insulator
platform for on-chip terabit/s optical interconnects. Optimum
filter design enables up to 21 flat-band filter channels with more
than 10 dB through-port extinction, more than 0.75-nm 3-dB
bandwidth, and less than 1-dB insertion loss. By overlaying a
negative thermo-optic coefficient polymer cladding on top of
the silicon device, the sensitivity of the filter performance to the
ambient temperature variations is significantly reduced. Moreover,
through careful balancing between the dispersion of the
bandwidth and the thermal property of the filter, the redundant
bandwidth of filter channels due to dispersion is employed as
thermal guard bands. As a result, the filter can accommodate
21 wavelength-division-multiplexing channels with data rates up
to 100 Gb/s per wavelength channel while providing sufficient
thermal guard bands to tolerate more than 15 C temperature
fluctuations in the on-chip environment.
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2010-12
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