Interrogation of a long-period grating using a mechanically scannable arrayed waveguide grating and a sampled chirped fiber Bragg grating

Honglei Guo; Yitang Dai; Gaozhi Xiao; Nezih Mrad; Jianping Yao

doi:10.1364/ol.33.001635

Interrogation of a long-period grating using a mechanically scannable arrayed waveguide grating and a sampled chirped fiber Bragg grating

Opt Lett. 2008 Aug 1;33(15):1635-7. doi: 10.1364/ol.33.001635.

Authors

Honglei Guo¹, Yitang Dai, Gaozhi Xiao, Nezih Mrad, Jianping Yao

Affiliation

¹ Microwave Photonics Research Laboratory, School of Information Technology and Engineering, University of Ottawa, Ottawa, Ontario, K1N 6N5, Canada.

PMID: 18670486
DOI: 10.1364/ol.33.001635

Abstract

A novel technique to interrogate a long-period grating (LPG) using a mechanically scannable arrayed waveguide grating (AWG) is proposed. This technique is implemented based on space-to-wavelength mapping by mechanically scanning the input light beam along the input coupler facet of an AWG. By employing a sampled chirped fiber Bragg grating with multiple peaks as a reference, the central wavelength of the LPG is measured. An interrogation system with a resolution of 10 pm at a speed of 10 Hz is demonstrated. Furthermore, the technique proposed can potentially offer subpicometer resolution at a speed of 500 Hz.