Lasers, Fiber Optics, and Communications

Photonic crystal fiber π-phase-shifted long-period gratings with wide bandpass and temperature insensitivity

[+] Author Affiliations
Shijie Zheng

Harbin Institute of Technology, School of Civil Engineering, Harbin 150090, China

Yinian Zhu

Northwestern University, Department of Mechanical Engineering, Evanston, Illinois 60208, United States

Opt. Eng. 54(11), 116101 (Nov 02, 2015). doi:10.1117/1.OE.54.11.116101
History: Received August 18, 2015; Accepted October 8, 2015
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Abstract.  In order to solve for the mode intensity distributions in a photonic crystal fiber (PCF) cross section and the propagation constant for the design of fiber bandpass filters, we numerically analyze the modal distributions of the fundamental core mode and different cladding modes. Based on the simulation results, we also experimentally demonstrate a simple fabrication of bandpass filters inscribed on the PCF by inserting a π-phase shift in a 12-period long-period grating (LPG). Two rejection bands with greater than 18 dB isolation and an ultra-wide band of 85.3 nm are achieved. The phase-shifted PCF-LPGs are fabricated using a CO2 laser with point-by-point focused pulses. The proposed fiber bandpass filter is compact and is not influenced by temperature effects.

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© 2015 Society of Photo-Optical Instrumentation Engineers

Citation

Shijie Zheng and Yinian Zhu
"Photonic crystal fiber π-phase-shifted long-period gratings with wide bandpass and temperature insensitivity", Opt. Eng. 54(11), 116101 (Nov 02, 2015). ; http://dx.doi.org/10.1117/1.OE.54.11.116101


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