We demonstrate a Yb-doped hybrid fiber with anomalous dispersion in the 1 μm spectral range. where asymptotically single-mode behavior is achieved with a differential mode amplification technique. The fiber has a dispersion of 70-100 ps/(nm·km) in the spectral range from 1. 020 μm to 1. https://spencertifieders.shop/product-category/preamps/