Thermal Control Scheme in Contra-Directional Couplers for Centered Tunable Bandwidths

We present an analytical simulation and thermal control scheme for a pitch-chirped Contra-Directional Coupler, able to achieve a 5-nm bandwidth-tunability range for a C-band reference channel at 1.55 µm. The proposed structure showcases central wavelength consistency in different bandwidth configurations, as well as high thermal-crosstalk resiliency.