On-chip circulator-free dispersion compensator with large and linear group delay based on chirped waveguide Bragg gratings

Yaoshuai Li; Shuangqing Li; Chen Liu; Qingzhong Huang; Chi Zhang; Xinliang Zhang

doi:10.1117/12.3007870

24 November 2023 On-chip circulator-free dispersion compensator with large and linear group delay based on chirped waveguide Bragg gratings

Yaoshuai Li, Shuangqing Li, Chen Liu, Qingzhong Huang, Chi Zhang, Xinliang Zhang

Author Affiliations +

Proceedings Volume 12935, Fourteenth International Conference on Information Optics and Photonics (CIOP 2023); 1293542 (2023) https://doi.org/10.1117/12.3007870
Event: Fourteenth International Conference on Information Optics and Photonics (CIOP 2023), 2023, Xi’an, China

Abstract

With the advance of optical communication and silicon photonics, dispersion compensators based on chirped waveguide Bragg gratings (CWBG) have developed rapidly in recent years. Nowadays, the longest CWBG has reached 20.11 cm with the largest group delay and lowest propagation loss. However, its group delay is nonlinear due to linear width variation. Thus, the extra third-order dispersion existed and is hard to use for second-order dispersion compensation. In this work, we propose and experimentally demonstrate, for the first time, an on-chip circulator-free dispersion compensator based on silicon nitride (Si₃N₄) CWBG with large and linear group delay. The dispersion device comprises spiral multi-mode antisymmetric index-chirped waveguide Bragg gratings and an asymmetric directional coupler on an 800-nm-thick low-loss Si₃N₄ platform. It utilizes two mode conversions to avoid the optical fiber circulator. The width variation function is modified to achieve the linear variation of the effective refraction index while the period remains unchanged. At last, the CWBG-based dispersion compensator is applied in a time-lens system to realize frequency-totime mapping. This integrated device has great potential for diverse applications such as long-haul transmission links, pulse compression, and pulse shaping.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Yaoshuai Li, Shuangqing Li, Chen Liu, Qingzhong Huang, Chi Zhang, and Xinliang Zhang "On-chip circulator-free dispersion compensator with large and linear group delay based on chirped waveguide Bragg gratings", Proc. SPIE 12935, Fourteenth International Conference on Information Optics and Photonics (CIOP 2023), 1293542 (24 November 2023); https://doi.org/10.1117/12.3007870

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