We present a new microring resonator (MRR)-based optical filter that takes advantage of the improvements that can be gained from cascading two (or more) MRR elements while physically using only one MRR element due to its unique looped-back configuration. This approach avoids the costly problem associated with dynamic control of matching (or aligning) the center-wavelengths coming from the two MRR elements. This new optical filter is a generalization of our previously reported filter (called LOBOUR) based on the Cascaded Over- and Under-coupling Resonator (COUR) architecture. Here, we compare the performance of our filter to four different configurations under the following criteria: (1) lower group delay (GD), and (2) simplified solution to wavelength-drift problem, (3) lower power consumption, (4) narrower linewidth, and (5) better extinction ratio (ER).
We present a minimalist design but high functionality micro-ring resonator based optical filter with narrow
linewidth and low group delay using a novel design we called LOBOUR for LOoped-Back Over- and Under-
Coupled Resonator (LOBOUR). The characteristics of both narrow linewidth and low group delay (low
chromatic dispersion) generally do not come together especially when using a single ring resonator. The
Cascaded Over- and Under-Coupled Resonator (COUR) design was able to achieve this goal but introduced
many practical fabrication issues. Here, we present an alternative design to COUR which uses only one ring
resonator and without fabrication and manufacturing issues. It can achieve 50 dB extinction ratio and tens of ps
performance. We also present important parameter selection mapping for LOBOUR.
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