Open Access3D integrated wavelength demultiplexer based on a square-core fiber and dual-layer arrayed waveguide gratings
Author(s) -
Xinhong Jiang,
Zhifang Yang,
Zexu Liu,
Zhangqi Dang,
Zhenming Ding,
Qing Chang,
Ziyang Zhang
Publication year - 2021
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.414827
Subject(s) - optics , materials science , demultiplexer , insertion loss , arrayed waveguide grating , wavelength division multiplexing , free spectral range , optoelectronics , coupling loss , multi mode optical fiber , chip , wavelength , waveguide , photolithography , multiplexing , optical fiber , physics , multiplexer , telecommunications , computer science
We present a 3D integrated wavelength demultiplexer using a square-core fiber (SCF) and matched dual-layer arrayed waveguide gratings (AWGs). The SCF works as a 3D fiber multimode interference device, which splits the input light into symmetric four spots. The spots are then coupled to a pitch-matched 4-waveguide network, each connecting an AWG. Interface waveguides are designed to improve the coupling efficiency between the SCF and the dual-layer chip. The four AWGs are designed with different central wavelengths and a large free spectral range (FSR) of 120 nm. To reach a small and uniform insertion loss among different channels, only the central channels of each AWG are used for demultiplexing. The device is fabricated on a polymer platform. The upper and lower layers of the chip are fabricated using the same photolithography mask but rotated 180° so that 4 different AWG designs can be mapped to a single chip. The measured transmission spectra of the four AWGs cover a bandwidth of 112 nm. The insertion loss variation is smaller than 1.4 dB. The designed device can find applications in fiber optic sensing, communication, and astronomy.