Two-dimensional coherent optical en/decoder based on serially coupled dumbbell microring resonator

Free spectral range (FSR) of reflection spectrum micro-ring resonator restricts the improvement in user capacity optical code division multiple access (OCDMA) system using array. Vernier effects can expand FSR cascaded microring resonator. Based on vernier effect, a novel two-dimensional coherent en/decoder serially coupled dumbbell is proposed this paper. The theoretical model transmission for series dumbbell-shaped resonators established. relation between suppression pseudo-modes and coupling coefficient analyzed detail. coefficient, processing error chip rate performance are studied. en/decoding simulation experiments carried out with radius 40 μm-30 μm-40 μm respectively. results show that comparing traditional respectively, value microcavity increased by 4 times increase exponentially. Meanwhile, ratio autocorrelation peak to maximum wing (<i>P</i>/<i>W</i>) cross-correlation (<i>P</i>/<i>C</i>) about 33% 8%,