(Peer-Reviewed) Broadband all-fiber optical phase modulator based on photo-thermal effect in a gas-filled hollow-core fiber
Shoulin Jiang 姜寿林 ¹, Feifan Chen 陈非凡 ¹ ², Yan Zhao 赵焱 ¹ ², Shoufei Gao 高寿飞 ³, Yingying Wang 汪滢莹 ³, Hoi Lut Ho 何海律 ¹ ², Wei Jin 靳伟 ¹ ²
¹ Photonics Research Center, the Hong Kong Polytechnic University Shenzhen Research Institute, Shenzhen 518057, China
中国 深圳 香港理工大学深圳研究院 光子学研究中心
² Department of Electrical Engineering and Photonics Research Institute, the Hong Kong Polytechnic University, Hong Kong 999077, China
中国 香港 香港理工大学 电机工程学系 光子技术研究院
³ Institute of Photonics Technology, Jinan University, Guangzhou 510632, China
中国 广州 暨南大学 光子技术研究院
Opto-Electronic Advances, 2022-11-04
Abstract
We report broadband all-fiber optical phase modulation based on the photo-thermal effect in a gas-filled hollow-core fiber. The phase modulation dynamics are studied by multi-physics simulation.
A phase modulator is fabricated using a 5.6-cm-long anti-resonant hollow-core fiber with pure acetylene filling. It has a half-wave optical power of 289 mW at 100 kHz and an average insertion loss 0.6 dB over a broad wavelength range from 1450 to 1650 nm. The rise and fall time constants are 3.5 and 3.7 μs, respectively, 2–3 orders of magnitude better than the previously reported microfiber-based photo-thermal phase modulators.
The gas-filled hollow-core waveguide configuration is promising for optical phase modulation from ultraviolet to mid-infrared which is challenging to achieve with solid optical fibers.
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