Simulation Of Optical Wavelength Filter Using Multimode Interference (MMI) Based On Sol–Gel Derived Organic–Inorganic Hybrid Materials

Abstract

Simulasi penapis optik untuk 1310nm panjang gelombang dan 1510nm operasi pada pandu gelombang optik planar berdasarkan bahan–bahan baru VTT yang berasal sol–gel menggunakan teknik MMI disajikan dalam tulisan ini. Bahan simulasi telah menunjukkan bahawa, pada prinsipnya, mirip dengan kecekapan penapisan dari bahan lain yang dilaporkan dalam peranti MMI, dalam kes pemusnahan nisbah (ER), ia dicatatkan sebanyak 18.4dB dan 21.6dB untuk panjang gelombang 1310 nm dan 1550 nm, masing–masing. Sementara itu, kehilangan masukan (IL) adalah sekitar 1.43–1.64 dB untuk kedua operasi penapisan. Struktur ini terdiri daripada dua bahagian kaskad MMI, iaitu mekanisma gangguan umum (GI) dan mekanisma gangguan berpasangan (PI). Kelebihan peranti berasaskan MMI dan bahan–bahan yang berasal sol–gel dibahas dalam makalah ini. Prinsip pencorakan sendiri, ciri–ciri bahan yg digunakan dan struktur akhir penapis berasaskan MMI ini juga ada ditunjukkan dalam makalah ini. Kata kunci: Gelombang pandu optik; penapis gelombang; MMI; mekanisma gangguan umum; mekanisma gangguan berpasangan; mekanisma gangguan; bahan–bahan terbitan sol–gel Simulation of optical wavelength filter for 1310nm and 1510nm operation on planar optical waveguides based on new VTT sol–gel derived material using Multimode Interference (MMI) technique is presented in this paper. Simulations of the material have demonstrated that in principle, similar filtering efficiency to other materials reported in MMI devices, in terms of extinction ratio (ER), it was simulated to be 18.4 and 21.6 dB for the wavelengths of 1310nm and 1550 nm, respectively. Meanwhile, the simulated insertion loss (IL) is around 1.43–1.64 dB for both filtering operations. The structure consists of two cascaded MMI sections, employing General Interference (GI) and Paired Interference (PI) mechanisms. The advantages of MMI based devices and sol–gel derived materials are discussed in this paper. The self–imaging principle, material characterizations and the final design of MMI based filter structure are also demonstrated in this paper. Key words: Optical waveguide; wavelength filter; MMI; general interference mechanism; paired interference mechanism; interference mechanisms; sol–gel derived material