Abstract
A passive all-solid photonic bandgap fiber (PBGF) was fabricated for ytterbium ASE controllable filtering.By direct adjustment of the fiber out-diameter in drawing process, we can tune the stop-band of ytterbium ASE to the desirable wavelength region. Our simulation results show a good agreement with measured bandgaps. The fiber is single mode and has a steep “cutting edge” in favor of ASE suppression. The measured transmission loss is 0.41 dB/km at wavelength of 1.55 μm within the longer wavelength bandgap, which is believed the lowest loss level of all-solid PBGF reported to the best of our knowledge. Its “stop-band” lies just in the range of 1.03–1.14 μm and shows a perfect ASE suppression by using only 0.2 m length of fiber. It provides a costless and feasible way to build the gain-controllable laser with the nowadays mature conventional ytterbium-doped fiber and such passive PBGF fiber. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2629–2632, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25578
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