The effects of ring radius on characteristics of ring modulator

Analysis of ring modulator helps to gain a better perception of modulator operation. There are extracted equations for transmission and modulation depth. These equations are based on loss, index and coupling modulation. Since the size of optoelectronic circuits is concern in nowadays industry, by using these extracted equations the effects of changes in ring radius on bandwidth is studied. In this study, loss, index and coupling modulation considered separately. When the ring radius changes 73 percent, the bandwidth changes 8GHz in loss modulation and 55GHz in index modulation. For coupling modulation the bandwidth is limited by FSR, where with increase the ring radius FSR decrease. Furthermore, the dependency of loss, index and coupling modulations bandwidth to quality factor parameter is investigated.