Study on polarization properties of graphene coated D-shaped fiber**Project supported by the National Natural Science Foundation of China (Grant Nos. 61575170, 61575168, and 61475133), the Basic Research Project of Hebei Province, China (Grant No. 16961701D), the Natural Science Foundation of Hebei Province, China (Grant No. F2016203392), the Provincial College and University Natural Science Foundation of Hebei, China (Grant No. QN2016078),

Abstract

The optical properties of graphene coated D-shaped single mode fiber and photonic crystal fiber are numerically analyzed. Enhancement of the graphene-light interaction is found in graphene coated D-shaped photonic crystal fiber, which introduces a tunable polarization of the D-shaped fiber by changing the chemical potential of the coated graphene. An optimal polarizer model is demonstrated with the extinction ratio of 66.26 dB/mm and the insertion loss of 9.4 dB/mm. The modulator extinction ratios of the TE mode and TM mode are 11.5 dB and 5 dB, respectively, with a device length of 100 μm. This paper provides a theoretical reference for the optical property research of the graphene fiber.