Acta Photonica Sinica, Volume. 53, Issue 8, 0823001(2024)
Investigation of Apodized Chirped Grating on Thin-film Lithium Niobate
Figures & Tables(12)
Fig. 1. Relationship between reflection spectrum， group delay and waveguide width
Fig. 3. Relationships between waveguide width and central wavelength， bandwidth， GDD， GD ripple for all three types of ACG
Fig. 4. Relationships between etching depth and attributes for all three types of ACG
Fig. 5. Relationships between apodization ratio of chirped grating and attributes
Fig. 10. Comparison of simulation of rectangular and non-rectangular structures
Table 1. All parameters of apodized chirped gratings
View tableView in ArticleTable 1. All parameters of apodized chirped gratings
Parameters Notation Remark Waveguide initial width Wb Range：0.8~1.4 μm Waveguide ending width We Range：0.8~1.4 μm Waveguide height H Fixed， 0.6 μm Etching depth D Grating pertubation Grating number N Determine grating length and coupling coefficient Apodization ratio Adapt for sym-linear and gaussian apodization Gaussian parameter Initial period Determine central wavelength and chirp rate Ending period Determine central wavelength and chirp rate Duty cycle dc Fixed， 0.5
Table 2. Comparison of three ACG performance
View tableView in ArticleTable 2. Comparison of three ACG performance
Apodization type GDD/（ps·nm-1） Ripple delta/ps Bandwidth/nm GVD/（ps·nm-1m-1） GDD×Bandwidth/Ripple delta Asym-linear 0.75 0.26 9 1 807.23 62 557.96 Sym-linear 0.41 0.17 12 987.95 69 737.77 Gaussian 0.22 0.12 12 506.02 53 012.05
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Jiaxuan LONG, Kan WU, Minglu CAI, Xujia ZHANG, Jianping CHEN. Investigation of Apodized Chirped Grating on Thin-film Lithium Niobate[J]. Acta Photonica Sinica, 2024, 53(8): 0823001
Paper Information
Category: Optical Device
Received: Jan. 3, 2024
Accepted: Feb. 27, 2024
Published Online: Oct. 15, 2024
The Author Email: WU Kan (kanwu@sjtu.edu.cn)
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