▎ 摘　　要

An all-optical fiber modulator with a graphene interlayer is proposed and calculated numerically. Graphene has excellent optical characteristics such as wide optical bandwidth, ultra-fast response and zero band gap, which makes the modulator cover the whole C and S band. Modulation rate is only limited by the inherent carrier relaxation time of graphene. We also deduced the mechanism of all-optical modulator based on graphene theoretically, and established a simple correspondence between the intensity of optical signal and the conductivity of graphene. The theoretical calculation results show that the slot structure can effectively improve the effect of graphene on the electric field distribution. The length of the slot structure is only 1.59 mm and the insertion loss can reach 1dB when modulation depth of 20 dB is achieved. The manufacturing tolerance of the structure is 35.42% of the whole device. The modulator based on a single-mode fiber that can be directly fused to the all-optical network and has broad application prospects.