Wideband Spectrum-Sliced ASE Source Operating at 1900-nm Region Based on a Double-Clad Ytterbium-Sensitized Thulium-Doped Fiber

• Main Authors: Halder, Arindam, Paul, Mukul Chandra, Shahabuddin, Nurul Shahrizan, Harun, Sulaiman Wadi, Saidin, Norazlina, Damanhuri, Siti Sarah Ahmad, Ahmad, Harith, Das, Shyamal, Pal, Mrinmay, Bhadra, Shyamal Kumar
• Format: Article
• Published: Institute of Electrical and Electronics Engineers (IEEE) 2012
• Subjects: QC Physics; TK Electrical engineering. Electronics Nuclear engineering
• Online Access: http://eprints.um.edu.my/19890/; https://doi.org/10.1109/JPHOT.2011.2177651

A wideband spectrum-sliced amplified spontaneous emission (ASE) source operating in 1900-nm region is demonstrated using a newly developed double-clad ytterbium-sensitized thulium-doped fiber (YTF) and a Sagnac loop mirror. The YTF used was drawn from a D-shape preform, which was fabricated using the modified chemical vapor deposition (MCVD) and solution doping technique. The YTF was pumped by a 980-nm multimode laser to generate an ASE at 1900 nm through the transition of thulium ion from 3F 4 to 3H 6 with the assistance of ytterbium to thulium ion energy transfer. The broadband ASE was spectral sliced by the loop mirror, which was constructed using a 3-dB coupler and a piece of polarization maintaining fiber (PMF). A wideband comb with channel spacing of 3.3 nm and an extinction ratio of 9 dB was achieved with a multimode pump power of 1 W within a wavelength range of more than 300 nm. The center of the comb spectrum was at 1888 nm with peak power of around -53 dBm.