Open AccessPhotonic crystal fiber based Mach-Zehnder interferometer for DPSK signal demodulation
Author(s) -
Jiangbing Du,
Yongheng Dai,
Gordon K. P. Lei,
Weijun Tong,
Chester Shu
Publication year - 2010
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.18.007917
Subject(s) - optics , demodulation , photonic crystal fiber , interferometry , mach–zehnder interferometer , materials science , fusion splicing , single mode optical fiber , cladding mode , optical fiber , physics , polarization maintaining optical fiber , fiber optic sensor , telecommunications , computer science , channel (broadcasting)
We demonstrate a novel fiber-based in-line DPSK demodulator using an in-fiber Mach-Zehnder interferometer (MZI). The device is fabricated by mismatch splicing of a photonic crystal fiber (PCF) with standard single mode fibers. The spectral characteristics at different PCF lengths are analyzed. The envelope of the interference fringes show a period that is inversely proportional to the PCF length, and is attributed to the periodic coupling between the core mode and the cladding mode. Error free demodulations of 10-Gb/s RZ- and NRZ-DPSK signals have been demonstrated using the in-fiber PCF-MZI demodulator with only 3-m PCF to introduce 91-ps delay. Wideband DPSK demodulation has also been achieved.