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We report,  for the first time to the best of our knowledge , a technique that employs ′cross-coupling structure’ in the cascaded microring resonators (MRRs) to bring new optical analogues of quantum coherence phenomena. The new configuration resembles a standard double resonator (SDR) but uses cross-coupled–based directional couplers (DCs) instead of the typical direct-coupled–based DCs. One of its unique features is that it  does not  exhibit the typical SDR’s  signature  quantum coherence analogue effects  like  coupled-resonator induced transparency ( CRIT)  or coupled-resonator induced absorption  (CRIA) . On the contrary, it produces a new very narrow reflection dip positioned at single-pass phase shift  θ  = − π/2 which we refer to as cross-coupled resonator induced shifted absorption (CRISA). We compare extensively CRISA’s characteristics with the CRIT, CRIA, and Autler-Townes splitting (ATS) found in SDR. The technique opens up new configurations with richer optical behaviours that could find potentially still unexplored applications.

New cross-coupled resonator induced shifted absorption (CRISA) in double microring resonators using a cross-coupling-structure technique