Abstract
We demonstrate a broadband acousto-optic notch filter based on a tubular-lattice hollow-core fiber for the first time to our knowledge. The guided optical modes are modulated by acoustically induced dynamic long-period gratings along the fiber. The device is fabricated employing a short interaction length (7.7 cm) and low drive voltages (10 V). Modulated spectral bands with 20 nm half-width and maximum depths greater than 60% are achieved. The resonant notch wavelength is tuned from 743 to 1355 nm (612 nm span) by changing the frequency of the electrical signal. The results indicate a broader tuning range compared to previous studies using standard and hollow-core fibers. It further reveals unique properties for reconfigurable spectral filters and fiber lasers, pointing to the fast switching and highly efficient modulation of all-fiber photonic devices.
| Original language | English |
|---|---|
| Pages (from-to) | 690-693 |
| Number of pages | 4 |
| Journal | Optics Letters |
| Volume | 49 |
| Issue number | 3 |
| Early online date | 29 Jan 2024 |
| DOIs | |
| Publication status | Published - 1 Feb 2024 |
Data Access Statement
Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.Funding
Fundação de Amparo à Pesquisa do Estado de São Paulo (2022/10584-9); Conselho Nacional de Desenvolvimento Científico e Tecnológico (309989/2021-3, 310650/2020-8)
Keywords
- Fiber lasers
- Long period fiber gratings
- Notch filters
- Photonic crystal fibers
- Photonic devices
- Spectral properties
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