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Optical Engineering

Photonic crystal fiber π-phase-shifted long-period gratings with wide bandpass and temperature insensitivity
Author(s): Shijie Zheng; Yinian Zhu
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Paper 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.

Paper Details

Date Published: 2 November 2015
PDF: 4 pages
Opt. Eng. 54(11) 116101 doi: 10.1117/1.OE.54.11.116101
Published in: Optical Engineering Volume 54, Issue 11
Show Author Affiliations
Shijie Zheng, Harbin Institute of Technology (China)
Yinian Zhu, Northwestern Univ. (United States)

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