Semi-vectorial analysis of a compact wavelength demultiplexer based on the tapered multimode interference coupler |
| |
Authors: | Xiao Jin-Biao Liu Xu Cai Chun and Sun Xiao-Han |
| |
Institution: | Lab of Photonics and Optical Communications, Electronic Engineering Department, Southeast University, Nanjing 210096, China |
| |
Abstract: | Based on a parabolically tapered multimode interference (MMI) coupler
with a deep-etched SiO2/SiON rib waveguide, a compact wavelength
demultiplexer operating at 1.30 and 1.55\mum wavelengths is
proposed and analysed by using three-dimensional semi-vectorial
finite-difference beam propagation method (3D-SV-FD-BPM). The results
show that a MMI section of 330.0\mum in length, which is only
76% length of a straight MMI coupler, is achieved with the
contrasts of 42.3 and 39.2dB in quasi-TE mode, and 38.4 and 37.8dB in
quasi-TM mode at wavelengths 1.30 and 1.55\mum, respectively, and
the insertion losses below 0.2dB at both wavelengths and in both
polarization states. The alternating direction implicit algorithm
with the Crank--Nicholson scheme is applied to the discretization of
the 3D-SV-FD-BPM formulation along the longitudinal direction.
Moreover, a modified FD scheme is constructed to approximate the
resulting equations along the transverse directions, in which the
discontinuities of the derivatives of magnetic field components
Hy and Hx along the vertical and horizontal interfaces,
respectively, are involved. |
| |
Keywords: | wavelength demultiplexer multimode interference beam propagation method photonic integrated
circuits |
本文献已被 维普 等数据库收录! |
| 点击此处可从《中国物理 B》浏览原始摘要信息 |
| 点击此处可从《中国物理 B》下载免费的PDF全文 |
|