Ultra-broadband and compact 2$\times$2 3-dB silicon adiabatic coupler based on supermode-injected adjoint shape optimization

Hongliang Chen, Guangchen Su, Xin Fu +1

The 2$\times$2 3-dB couplers are one of the most widely used and important components in silicon photonics. We propose an ultra-broadband and compact 2$\times$2 3-dB adiabatic coup…