Influence of coupled cavities on the characteristics of asymmetric Fabry-Perot modulators

In this work, we address the issue of expanding significantly the optical bandwidths of Fabry-Perot (FP) modulators by adopting a coupled FP (CFP) resonator configuration. Optical modulators based on the optimized CFP designs should have sufficiently wide optical bandwidths, and the excellent characteristics found in the best asymmetric FP modulators. A schematic of a general two-section coupled-cavity resonator is described. The CFP system can be designed such that both resonators can be independently tuned to control the output reflectivity spectrum by varying the individual cavity absorption and refractive index. Here, we focus on the configuration of a top passive absorption-free etalon coupled to a bottom absorption-tunable etalon