DESIGN A 2x2 COMPACT MODE SWITCHING USING MULTIMODE INTERFERENCE BASED ON SILICON MATERIAL

Abstract

<jats:p>&lt;p&gt;We propose a new design of a 2x2 optical chip for switching optical modes based on silicon material. Input lights at fundamental mode of transverse electric (TE) polarization can be selected at the output by appropriately controlling a 180-degree butterfly-shaped phase shifter. The proposed device consists of two multimode interference waveguides MMI and a phase shifter packed in a compact size of 4.2μm x 0.22μm x 110.4μm. We use 3D-BPM numerical simulation method to evaluate optical conversion efficiency of device. The result shows that insertion loss is always less than 1.5dB and crosstalk is always below -30dB in a wavelength range from 1.5 to 1.6 . Moreover, we continue to evaluate the proposed device on the system with signal’s bitrate of 35Gbps, the bit error rate is always less than 10&lt;sup&gt;-10&lt;/sup&gt; in the whole bandwidth of 100nm.&lt;/p&gt;</jats:p>

Multimode interference coupler based on general interference for integrated optical and quantum optic devices: a review

“…In recent years, single MMI structure have been used in order to achieve switching functions [16,86,87]. The active GIMMI structure [86] considering nonlinear effects in coupling regions is employed for optical switching [87]. Figure 12(a) shows a 2 × 2 MMI switch having material of a +ve Kerr nonlinearity.…”

“…Figure 12(a) shows a 2 × 2 MMI switch having material of a +ve Kerr nonlinearity. The self and threshold switching characteristics are obtained using Kerr nonlinear material within MMI regions [87] as seen in transmission characteristics in MEP_L_fig12 figure 12(b). The scalar form of Helmholtz equation describes the propagation of the light considering a Kerr nonlinear medium as follows [87]…”

“…n i is linear index in the guide region, k o is the vacuum wave number, and γ is the third order nonlinear refractive index in units of square meters per square volt. The electric field at distance z in MMI region is written using perturbation theory as [87] å The device operation follows the principle of self guiding changed by the incident light into a self-induced single-mode waveguide. Using MMI waveguide structures and considering proper Kerr nonlinear material, a high-speed switch can be obtained.…”