General coupled mode theory in non-Hermitian waveguides

Coupled mode theory (CMT) can be traced back to 3 decades ago, and has been an indispensable tool of analyzing and designing waveguides, resonators, couplers or many other devices from microwave frequency to optical frequency [1], in both time and space domain. In the presence of loss and gain, the coupled mode equation on describing the mode hybridization… (More)