Large-FSR Thermally Tunable Double-Ring Filters for WDM Applications in Silicon Photonics
We present the design procedure and experimental results of thermally tunable
double ring resonators for integrated wavelength division multiplexing applications. A
detailed analytical model specific for double rings is described, and a modified racetrack
geometry using Bezier bends is used to reduce bending loss. We demonstrate devices with
a free-spectral-range up to 2.4 THz (19 nm) around 1550 nm and nonadjacent channel
rejection higher than 35 dB. The experimental results of thermally tunable double ring resonators
is also presented with doped silicon integrated heaters, allowing the device to be
used as a tunable filter or a switch.
KeyWords
Integrated optics, optical switches, ring resonators
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