Design of High-Precision Parallel AWG Demodulation System

Yunjing Jiao; Qijing Lin; Kun Yao; Na Zhao; Dan Xian; Fuzheng Zhang; Qingzhi Meng; Bian Tian; Zhuangde Jiang

doi:10.3390/mi14091662

Design of High-Precision Parallel AWG Demodulation System

Micromachines (Basel). 2023 Aug 25;14(9):1662. doi: 10.3390/mi14091662.

Authors

Yunjing Jiao¹, Qijing Lin^{1

2

3

4}, Kun Yao¹, Na Zhao¹, Dan Xian¹, Fuzheng Zhang¹, Qingzhi Meng¹, Bian Tian¹, Zhuangde Jiang¹

Affiliations

¹ State Key Laboratory of Mechanical Manufacturing Systems Engineering, Xi'an Jiaotong University, Xi'an 710049, China.
² School of Mechanical and Manufacturing Engineering, Xiamen Institute of Technology, Xiamen 361021, China.
³ Shandong Laboratory of Advanced Materials and Green Manufacturing at Yantai, Yantai 264000, China.
⁴ Bright Stone Industrial Technology Research Institute, Yantai 265503, China.

Abstract

Here, we present a high-precision demodulation method that supports the arrayed waveguide grating (AWG) system, which includes a 1 × 8 AWG as the primary filter with a 0.5 nm channel spacing and a 1 × 4 AWG as the auxiliary filter with a 1 nm channel spacing. The high precision is achieved through an innovative method of decoupling three channels, involving two adjacent channels of the primary filter and one channel of the secondary auxiliary filter. Simulation results show that the AWGs have a good transmission spectrum with crosstalk below -24.8 dB, non-uniformities below 0.8 dB, insertion loss below -3.7 dB, 3 dB bandwidth of 0.25 nm, and 10 dB bandwidth of 0.43 nm. The interrogation precision can reach 8 pm, with a dynamic range of 0.4 nm, corresponding to a single FBG.

Keywords: arrayed waveguide grating; integrated optics; stagger peak decouple.

Grants and funding

This research was funded by the National Key R&D Program of China, grant number 2022YFB3205300, and the National Natural Science Foundation of China, grant number 51890884.