Fig. 1. (a) Schematic diagram of an optical system composed of two optical cavities and the atomic ensemble; (b) realistic setup of that optical system with the double-cavity orthogonal structure.

Fig. 2. Normalized output field intensities vs. normalized input field detuning with tunneling strength : (a) ; (b) (cavity-a), (cavity-b); (c) ; (d) (cavity-b), (cavity-a). Other parameters are , , .

Fig. 3. Normalized output field intensities (red-line) and (blue-line) vs. the relative phase with . Other parameters are , , , .

Fig. 4. Normalized output group delay ( ) vs. normalized input field detuning with tunneling strength of (a) ,(b) , (c) , (d) ; (e) output group delay ( ) vs. normalized tunneling strength for . Other parameters are , , .