Ultra low loss broadband 1 $\times$ 2 optical power splitters with various splitting ratios

TL;DR

This paper presents the design and simulation of ultra-efficient, broadband Si-based all-dielectric 1x2 optical power splitters with various ratios, achieving high transmission efficiency and minimal losses.

Contribution

The work introduces novel all-dielectric splitters with high efficiency, broad bandwidth, and compact footprint, optimized through inverse design and FDTD simulations.

Findings

Transmission efficiency above 98% for TE splitters

Excess losses below 0.1 dB, 0.035 dB for TE and TM

Broad operating bandwidth of 200 nm

Abstract

We designed Si-based all-dielectric 1 $\times$ 2 TE and TM power splitters with various splitting ratios and simulated them using the inverse design of adjoint and numerical 3D finite-difference time-domain methods. The proposed devices exhibit ultra-high transmission efficiency above 98 and 99\%, and excess losses below 0.1 and 0.035 dB, for TE and TM splitters, respectively. The merits of these devices include a minor footprint of 2.2 $\times$ 2.2 $\mu$m $\times$ $\mu$m and a broad operating bandwidth of 200 nm with a center wavelength of $\lambda$ = 1.55 $\mu$ m.