3.5 W Broadband PM Hybrid Amplifier at 2051 nm With Holmium- and Thulium-Doped Single-Clad Fibers

We report the design and performance of a packaged broadband PM hybrid HDFA/TDFA in the 2000-2100 nm band using all-single-clad doped fibers. Internalsmall signal G = 49.1 dB, small signal NF = 6.5 dB, and Pout = 3.54 W are achieved at λs = 2051 nm. The simulated 3 dB output power bandwidth is 98 nm. Comparisons of experimental data and simulations show good agreement. We investigate through simulations an all-Holmium two stage PM optical amplifier design for comparison to the hybrid PM HDFA/TDFA.