Meter-long broadband chirped Bragg gratings for on-chip dispersion control and pulse shaping
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| Main Authors: | , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866910128662380544 |
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| author | Geng, Zhaoting Tong, Yitian Zhang, Chuchen Tang, Huajun Du, Zhenmin Xia, Yu Liu, Mingfei Yu, Di Huang, Yuhao Huang, Yaoran Li, Zheng Dai, Tianxiang Wong, Kenneth Kin-Yip Chen, Hongwei Xiang, Chao |
| author_facet | Geng, Zhaoting Tong, Yitian Zhang, Chuchen Tang, Huajun Du, Zhenmin Xia, Yu Liu, Mingfei Yu, Di Huang, Yuhao Huang, Yaoran Li, Zheng Dai, Tianxiang Wong, Kenneth Kin-Yip Chen, Hongwei Xiang, Chao |
| contents | Precise on-chip dispersion control is essential for advanced integrated photonic technologies, enabling applications ranging from high-speed communications and sensing to signal processing and biomedical imaging. However, existing on-chip dispersion control methods still suffer from substantial loss and a limited dispersion-bandwidth product (DBP) far from application needs. As a result, on-chip systems continue to rely exclusively on off-chip dispersion control solutions provided by optical fiber or bulky free-space optics. To overcome these limitations, we design and fabricate meter-long chirped spiral Bragg gratings (CSBGs) on the ultra-low-loss silicon nitride (SiN) photonic platform for advanced dispersion control. Our device achieves a 10-nanosecond group delay with customizable bandwidths exceeding 10 nanometers within a compact footprint of only 30 $\text {mm} ^2$, surpassing the physical limits of fiber-based grating devices. More importantly, CSBGs can simultaneously possess the characteristics of high stability, low latency, and a large DBP, thanks to the ultra-low-loss SiN platform with a loss of only 0.3 dB/m. Leveraging the precise and stable dispersion profile, we demonstrate high-fidelity pulse shaping and compression of electro-optic frequency combs (EOCs) with a 1-GHz repetition rate centered across the entire reflection bandwidth. The compressed pulse has an on-chip peak (average) power of 21.6 watts (580 milliwatts). Furthermore, we showcase for the first time the application of on-chip pulse-compressed EOC in wavelength-swept coherent anti-Stokes Raman scattering (CARS) microscopy. Our work provides integrated photonics with a long-sought, scalable, and robust solution for high-performance on-chip dispersion control, empowering a new generation of on-chip functionalities. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_12564 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Meter-long broadband chirped Bragg gratings for on-chip dispersion control and pulse shaping Geng, Zhaoting Tong, Yitian Zhang, Chuchen Tang, Huajun Du, Zhenmin Xia, Yu Liu, Mingfei Yu, Di Huang, Yuhao Huang, Yaoran Li, Zheng Dai, Tianxiang Wong, Kenneth Kin-Yip Chen, Hongwei Xiang, Chao Optics Precise on-chip dispersion control is essential for advanced integrated photonic technologies, enabling applications ranging from high-speed communications and sensing to signal processing and biomedical imaging. However, existing on-chip dispersion control methods still suffer from substantial loss and a limited dispersion-bandwidth product (DBP) far from application needs. As a result, on-chip systems continue to rely exclusively on off-chip dispersion control solutions provided by optical fiber or bulky free-space optics. To overcome these limitations, we design and fabricate meter-long chirped spiral Bragg gratings (CSBGs) on the ultra-low-loss silicon nitride (SiN) photonic platform for advanced dispersion control. Our device achieves a 10-nanosecond group delay with customizable bandwidths exceeding 10 nanometers within a compact footprint of only 30 $\text {mm} ^2$, surpassing the physical limits of fiber-based grating devices. More importantly, CSBGs can simultaneously possess the characteristics of high stability, low latency, and a large DBP, thanks to the ultra-low-loss SiN platform with a loss of only 0.3 dB/m. Leveraging the precise and stable dispersion profile, we demonstrate high-fidelity pulse shaping and compression of electro-optic frequency combs (EOCs) with a 1-GHz repetition rate centered across the entire reflection bandwidth. The compressed pulse has an on-chip peak (average) power of 21.6 watts (580 milliwatts). Furthermore, we showcase for the first time the application of on-chip pulse-compressed EOC in wavelength-swept coherent anti-Stokes Raman scattering (CARS) microscopy. Our work provides integrated photonics with a long-sought, scalable, and robust solution for high-performance on-chip dispersion control, empowering a new generation of on-chip functionalities. |
| title | Meter-long broadband chirped Bragg gratings for on-chip dispersion control and pulse shaping |
| topic | Optics |
| url | https://arxiv.org/abs/2604.12564 |