Analysis of Multimode Interference Coupler With a Width of Arbitrary-Exponent Binomial Function

Abstract

Multimode interference (MMI) couplers with a width of arbitrary-exponent binomial function are proposed. The proposed structure includes the conventional, butterfly, and parabolic structure such that the proposed MMI device can be used for equal and unequal power splitting. With a proper choice of the exponent of a binomial function, several equal and unequal optical powers splitting ratio can be obtained. For comparison, the optical power splitting ratios, total transmission, and coupler length of the proposed MMI couplers are discussed.

A study of multimode interference power splitter with a truncated-and-raised interference region

“…For simplicity only linearly truncated interference region are considered in this work. Previous works were focused on different tailoring of the width of the interference region [2,5,6]. With an additional height, the improvement of device characteristics will be more interesting for future study.…”

“…Recently, optical modules on a chip and optical interconnects are attracting much attention [1]. For this demand, MMI multi-port power splitters are considered for on-chip optoelectronic integrated circuit and backplane networks [2]. However, the field intensities of the output waveguide branches are not quite the same, which gives rise to a non-uniformity of the output power ratio [3,4].…”

“…However, the field intensities of the output waveguide branches are not quite the same, which gives rise to a non-uniformity of the output power ratio [3,4]. To fine adjust the non-uniformity, the width of the interference region is often slightly tailored [2,5,6]. The reported results showed that the output power nonuniformity is decreased and the total power transmission is increased [7].…”

An MMI-Based 4-Beam Combiner with Spline-Curved Index Step

“…There are several approaches [8][9][10][11] to shorten the length of MMI couplers. In [8],Özbayat et al reported nonuniform refractive index patterns with multiple rectangular patches.…”

“…In [8],Özbayat et al reported nonuniform refractive index patterns with multiple rectangular patches. Non-straight sidewall MMIs using binomial functions [9], exponential functions [10], and parabolic functions [11], have been also studied to realize compact devices.…”