Spectral Shaping with Integrated Self-Coupled Sagnac Loop Reflectors

TL;DR

This paper introduces a novel integrated photonic filter design using coupled Sagnac loop reflectors with self-coupled waveguides, enabling multiple spectral shaping functions through coherent mode interference.

Contribution

The work presents a new integrated filter architecture that achieves multiple spectral functions by tailoring interference in self-coupled Sagnac loop reflectors, with theoretical analysis of device parameters.

Findings

Achieved Fano-like resonances, wavelength interleaving, and mode splitting.

Theoretical verification of device performance and tunability.

Potential for compact, multi-functional spectral shaping in integrated photonics.

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.