A fabrication-friendly graphene-based polarization insensitive optical modulator

• DOI: 10.1016/j.ijleo.2019.02.024
• Publication Date: 2019-02-12T02:18:11Z
• Authors: Zhonghua Yang; Rongguo Lu; Yujiao Wang; Songwei Cai; Yujia Zhang; Xiaoju Wang; Yong Liu
• Keywords: 02 engineering and technology; 0210 nano-technology

Abstract Graphene is a suitable material for high efficient optical modulator. However, graphene-based modulators are of strong polarization dependence. Here a fabrication-friendly structure for graphene-based polarization insensitive electro-absorption modulator (EAM) is reported. The modulator consists of two adiabatic tapers (ATs), two asymmetric directional couplers (ADCs) and an active region. The ATs and ADCs are used to realize mode conversion and mode coupling. The theoretical analysis of the modulator was performed. The device can operate at the spectrum of 1.5 μm–1.6 μm. The extinction ratio (ER) is of >24dB and the insertion loss is of