Chin. Phys. Lett.  2020, Vol. 37 Issue (10): 104201    DOI: 10.1088/0256-307X/37/10/104201
Tunable Optical Bandpass Filter via a Microtip-Touched Tapered Optical Fiber
Peng-Fei Zhang1,2*, Li-Jun Song1, Chang-Lin Zou3,1*, Xin Wang1, Chen-Xi Wang1, Gang Li1,2, and Tian-Cai Zhang1,2
1State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-Electronics, Shanxi University, Taiyuan 030006, China
2Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China
3CAS Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026, China
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Peng-Fei Zhang, Li-Jun Song, Chang-Lin Zou et al  2020 Chin. Phys. Lett. 37 104201
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Abstract We demonstrate a tunable bandpass optical filter based on a tapered optical fiber (TOF) touched by a hemispherical microfiber tip (MFT). Other than the interference and selective material absorption effects, the filter relies on the controllable and wavelength-dependent mode–mode interactions in TOF. Experimentally, a large range of tunability is realized by controlling the position of the MFT in contact with the TOF for various TOF radii, and two distinct bandpass filter mechanisms are demonstrated. The center wavelength of the bandpass filter can be tuned from 890 nm to 1000 nm, while the FWHM bandwidth can be tuned from 110 nm to 240 nm when the MFT touches the TOF in the radius range from 160 nm to 390 nm. The distinction ratio can reach $28 \pm 3$ dB experimentally. The combined TOF-MFT is an in-line tunable bandpass optical filter that has great application potential in optical networks and spectroscopy, and the principle could also be generalized to other integrated photonic devices.
Received: 03 August 2020      Published: 22 September 2020
PACS:  42.81.-i (Fiber optics)  
  42.79.Ci (Filters, zone plates, and polarizers)  
  07.60.Vg (Fiber-optic instruments)  
Fund: Supported by the National Basic Research Program of China (Grant No. 2017YFA0304502), the National Natural Science Foundation of China (Grant Nos. 11974225, 11634008, and 11974223), the Fund for Shanxi “1331 Project” Key Subjects, the Program of State Key Laboratory of Quantum Optics and Quantum Optics Devices (Grant No. KF201809), and the Anhui Initiative in Quantum Information Technologies (Grant No. AHY130000).
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Peng-Fei Zhang
Li-Jun Song
Chang-Lin Zou
Xin Wang
Chen-Xi Wang
Gang Li
and Tian-Cai Zhang
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