摘要
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 3.7μs,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.
基金
We are grateful for financial supports from the National Key Research and Development Program of China(2019YFB2203904)
the National Natural Science Foundation of China(U21A20506,62105122,61827820,62005233)
the Shenzhen STIC Funding(RCBS20200714114819032)
the Local Innovative and Research Teams Project of Guangdong Pear River Talents Program(2019BT02X105).
