Absorption loss 1 Aluminum 1 Aluminum coatings 1 Broadband amplifiers 1 Chemical vapor deposition 1 Co-doped 1 Erbium 1 Erbium doped fiber amplifiers 1 Erbium doped fibers 1 Erbium-doped fiber Fiber amplifiers 1 Fibers 1 Input signal power 1 Modified chemical vapor depositions 1 Optical switches 1 Solution doping 1 Wavelength regions 1 Wide-band 1 Yttrium alloys 1 Zirconia 1 Zirconia Yttria Aluminum co-doped fiber 1 Zirconium 1 wideband optical amplifier 1