Abstract
A polarization-insensitive graphene-based mid-infrared optical modulator is presented that comprised SiO2/ Ge23Sb7S70, in which two graphene layers are embedded with a semiellipse layout to support transverse magnetic (TM) and transverse electric (TE) polarizing modes with identical absorption. The key performance index for the polarization independent modulator is polarization-sensitivity loss (PSL). The waveguide of our device just supports basic TE and TM modes, and the PSL between two modes is of < 0.24 dB. The model can offer extinction ratio (ER) more than 16 dB and insertion loss less than 1 dB. The operation spectrum ranges from 2 to 2.4 μm with optical bandwidth of 400 nm. The 3 dB modulation bandwidth is as high as 136 GHz based on theoretical calculation.
Highlights
Near-infrared wavelength optical fiber communication networks are becoming the core of the whole telecommunication networks
We present a new structure of graphenebased mid-infrared polarization-independent electrooptic modulator, which has the advantages of large modulation bandwidth and wide spectrum of polarization insensitivity
Results and Discussion the polarization-independent electro-optic modulator based on graphene has been reported [15–21], the polarization independence of these devices is closely related to wavelength [22]
Summary
Near-infrared wavelength optical fiber communication networks are becoming the core of the whole telecommunication networks. Mid-infrared integrated electro-optic devices, such as photodetectors and modulators, are developed to expand the 1.55 μm communication window. 2D functional electro-optic materials, such as graphene [1–4], chalcogenide [5], and black phosphorus [6], have been discovered, which accelerated the development of integrated electro-optic and broke the traditional performance limitation. Among these materials, graphene is considered as an ideal material. Graphene as electro-optic material, we need to consider one of the most important characteristics of anisotropic dielectric [15], which has been experimentally. To realize the wide commercial application of graphene-based modulator, the problem of polarization dependent needs to be solved
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