Filter Spectral Shaping with Integrated Coupled Sagnac Loop Reflectors
in Self-Coupled Nanowires
Abstract
We propose and theoretically investigate integrated photonic filters
based on coupled Sagnac loop reflectors (SLRs) formed by a self-coupled
wire waveguide. By tailoring coherent mode interference in the device,
three different filter functions are achieved, including Fano-like
resonances, wavelength interleaving, and varied resonance mode
splitting. For each function, the impact of device structural parameters
is analyzed to facilitate optimized performance. Our results
theoretically verify the proposed device as a compact multi-functional
integrated photonic filter for flexible spectral shaping.