Title :
Critical Wavelength in the Transmission Spectrum of SMS Fiber Structure Employing GeO
-Doped Multimode Fiber
Author :
Tripathi, Saurabh Mani ; Kumar, Arun ; Marin, Emmanuel ; Meunier, Jean-Pierre
Author_Institution :
Dept. of Phys., Indian Inst. of Technol. Delhi, New Delhi, India
fDate :
6/1/2010 12:00:00 AM
Abstract :
We demonstrate and explain the existence of a critical wavelength in the transmission spectrum of single-multi-singlemode fiber structures, employing GeO2-doped multimode fibers (MMFs), such that the spectrum shows opposite spectral shift on either side of this wavelength with increasing temperature. Further, the shift is maximum for peaks/dips nearest to this wavelength. The variation of critical wavelength with temperature is also measured. A theoretical account of the observed behavior has been presented and the results are found to be in excellent agreement with the experiments. It is shown theoretically that for a given MMF there should be two critical wavelengths of the opposite nature separated by a large wavelength difference.
Keywords :
fibre optic sensors; germanium compounds; infrared spectra; optical fibre testing; refractive index; spectral line shift; SMS fiber structure; critical wavelength; multimode fibers; refractive index profile; single-multisinglemode fiber structures; spectral shift; transmission spectrum; Intermodal dispersion; multimode interference effects; optical fiber sensor;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2010.2046155