Neodymium (Nd)-doped fibers are potential candidates for optical fiber amplifiers operating near the 1.3-μm spectral region due to the 4F3/2→4I13/2 transition of Nd3+ ions. But, there is an amplified spontaneous emission at 1.06 μm due to the 4F3/2→4I11/2 transition whose branching ratio is about 5 times larger than that at 1.3 μm. In order to suppress the transmission of the 1.06-μm emission, we propose a new tellurite all-solid photonic bandgap fiber (ASPBF) with a single line of high index rods and double cladding layers. Tellurite glasses of TeO2-Li2O-WO3-MoO3-Nb2O5 (TLWMN), TeO2- ZnO-Na2O-La2O3 (TZNL) and TeO2-ZnO-Li2O-K2O-Al2O3-P2O5 (TZLKAP) are developed. High-index rods of TLWMN and an Nd-doped TZNL rod are arranged symmetrically and horizontally in the x-axis of a hexagonal TZNL cladding. The outer cladding is made of the TZLKAP glass. The finite element method is used to calculate the mode distribution and the bandgap properties. The fiber transmission spectra are numerically investigated with the effects of rod diameter and filling factor variation. When the core diameter is 3.0 μm, rod diameter is 2.3 μm and filling factor is from 0.7 to 0.8, the 1.06-μm emission which is caused by the 4F3/2→4I11/2 transition can be suppressed as compared with the 1.33-μm emission which is caused by the 4F3/2→4I13/2 transition.
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