Figure 1
From: Single-photon multi-ports router based on the coupled cavity optomechanical system
Schematic configuration of the single-photon router.
(a) The two toroidal cavities with mechanical modes coupling to waveguide. (b) The four ports router with quasi-mode. The router consist of optomechanics as a single photon source, fibers, phase delayer with delay phase 
and beam splitters to change photon from normal mode to quasi-mode.
