Parity-time symmetry enabled ultra-efficient nonlinear optical signal processing

Chanju Kim; Xinda Lu; Deming Kong; Nuo Chen; Yuntian Chen; Leif Katsuo Oxenløwe; Kresten Yvind; Xinliang Zhang; Lan Yang; Minhao Pu; Jing Xu

doi:10.1186/s43593-024-00062-w

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Parity-time symmetry enabled ultra-efficient nonlinear optical signal processing

光：快讯（英文） 2024年4卷

RESEARCH ARTICLE | Updated：2024-09-25

- Parity-time symmetry enabled ultra-efficient nonlinear optical signal processing
- Parity-time symmetry enabled ultra-efficient nonlinear optical signal processing
- Affiliations：
  
  School of Optical and Electronic Information, Huazhong University of Science and Technology, Luoyu Road 1037#, Wuhan 430074, China
  DTU Electro, Department of Electrical and Photonics Engineering, Technical University of Denmark, Ørsteds Plads 343, Kongens Lyngby 2800, Denmark
  Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Luoyu Road 1037#, Wuhan 430074, China
  Optics Valley Laboratory, Hubei 430074, China
  Department of Electrical and Systems Engineering, Washington University, St. Louis, MO 63130, USA
- Author bio：
  
  *Minhao Pumipu@dtu.dk
  Jing Xujing_xu@hust.edu.cn
- Funds：
  
  National Key Research and Development Program of China(2019YFB2203100);National Natural Science Foundation of China (NSFC)(62275087);European Research Council(REFOCUS 853522);Danish National Research Foundation, SPOC(DNRF123);Knowledge Innovation Program of Wuhan-Shuguang Project(2022010801010082)
- DOI：10.1186/s43593-024-00062-w
  中图分类号：
- 收稿日期：2023-08-26，
  
  修回日期：2024-01-30，
  
  录用日期：2024-02-12，
  
  网络出版日期：2024-04-04，
  
  纸质出版日期：2024-12
- Accepted：
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Parity-time symmetry enabled ultra-efficient nonlinear optical signal processing[J]. 光：快讯（英文）, 2024,4.

Chanju Kim, Xinda Lu, Deming Kong, et al. Parity-time symmetry enabled ultra-efficient nonlinear optical signal processing[J]. Elight, 2024, 4.
Parity-time symmetry enabled ultra-efficient nonlinear optical signal processing[J]. 光：快讯（英文）, 2024,4. DOI： 10.1186/s43593-024-00062-w.

Chanju Kim, Xinda Lu, Deming Kong, et al. Parity-time symmetry enabled ultra-efficient nonlinear optical signal processing[J]. Elight, 2024, 4. DOI： 10.1186/s43593-024-00062-w.

摘要

Abstract

Nonlinear optical signal processing (NOSP) has the potential to significantly improve the throughput

flexibility

and cost-efficiency of optical communication networks by exploiting the intrinsically ultrafast optical nonlinear wave mixing. It can support digital signal processing speeds of up to terabits per second

far exceeding the line rate of the electronic counterpart. In NOSP

high-intensity light fields are used to generate nonlinear optical responses

which can be used to process optical signals. Great efforts have been devoted to developing new materials and structures for NOSP. However

one of the challenges in implementing NOSP is the requirement of high-intensity light fields

which is difficult to generate and maintain. This has been a major roadblock to realize practical NOSP systems for high-speed

high-capacity optical communications. Here

we propose using a parity-time (PT) symmetric microresonator system to significantly enhance the light intensity and support high-speed operation by relieving the bandwidth-efficiency limit imposed on conventional single resonator systems. The design concept is the co-existence of a PT symmetry broken regime for a narrow-linewidth pump wave and near-exceptional point operation for broadband signal and idler waves. This enables us to achieve a new NOSP system with two orders of magnitude improvement in efficiency compared to a single resonator. With a highly nonlinear AlGaAs-on-Insulator platform

we demonstrate an NOSP at a data rate approaching 40 gigabits per second with a record low pump power of one milliwatt. These findings pave the way for the development of fully chip-scale NOSP devices with pump light sources integrated together

potentially leading to a wide range of applications in optical communication networks and classical or quantum computation. The combination of PT symmetry and NOSP may also open up opportunities for amplification

detection

and sensing

where response speed and efficiency are equally important.

关键词

Keywords

references

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