An all-fiber optical attenuator based on adjustable coupling angle of microfiber

Ji, Yancheng; Chen, Yu-Pei; Sun, Dan; Zhang, Guoan; Wang, Chinhua; Zhu, Xiaojun

doi:10.1016/j.optcom.2021.126771

Cited by 3 publications

(1 citation statement)

References 29 publications

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“…The miniaturized optical attenuator has been proven to be an essential component in optical communication system 1 . In recent years, various tunable optical attenuation methods based on different principles such as refractive index change 2,3 , acousto-optic effect 4 , optical field reflection 5 , and evanescent field coupling 6,7 , have been reported. Among these methods, the approach based on nanofibers has gained significant attention due to its simple structure, high-cost effectiveness, and high compatibility to optical fiber networks 8 .…”

Section: Introductionmentioning

confidence: 99%

A miniaturized tunable optical attenuator with ultrawide bandwidth based on evanescent-field coupling between nanofibers

Fan,

Zhang,

Zhang

et al. 2024

Preprint

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We propose a novel miniaturized optical attenuator based on the evanescent-field coupling between two nanofibers. Benefiting from a wavelength-dependent waveguiding property of the coupled structure, a tunable attenuation with maximum extinction ratio of ∼ 20 dB is demonstrated with an ultrawide optical bandwidth up to 0.7 µm in experiment. The wavelength-depended waveguiding properties of both one single nanofiber and coupled nanofibers are investigated in both theory and simulation. Using an adiabatic coupling structure, an attenuation range from -0.16 dB to -18.46 dB is obtained within a spectrum from 1.2 µm-1.7 µm experimentally. Moreover, the simulated results indicate that, the attenuation only shows a slight change of ∼ 0.1 dB with a lateral misalignment of 0.5 µm between the two nanofibers, indicating a high tolerance of this attenuator to the lateral misalignment. Considering the wide bandwidth as well as the ultracompact structure, this attenuator shows high potential in applications such as all-fiber optical sensing and communicating.

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