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Ultra-broadband and compact 22 3-dB silicon adiabatic coupler based on supermode-injected adjoint shape optimization
The 22 3-dB couplers are one of the most widely used and important
components in silicon photonics. We propose an ultra-broadband and compact
22 3-dB adiabatic coupler defined by b-splines and optimized with an
efficient supermode-injected adjoint shape optimization. By employing mode
adiabatic evolution and mode coupling at two different wavelength ranges,
respectively, we achieve an ultra-broad bandwidth of 530 nm from 1150nm
to1680nm with a power imbalance below 0.76 dB in a compact coupling length
of 30 according to our simulation results. The supermode-injected
adjoint shape optimization can also be applied to the design of other photonic
devices based on supermode manipulation
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