Coherent transfer over 1.1 spectral octave with a fiber frequency comb

Highly coherent optical frequency combs have applications ranging from broadband spectroscopy with high sensitivity and accuracy [1], to the spectral dissemination of optical frequency references [2], where coherently linking the visible spectrum to the telecom band is important for the development of novel ultra-stable lasers in the 1.5 µm spectral region as well as long-haul optical carrier transfer [3]. In this contribution, we report on coherent transfer over more than one spectral octave with a Yb-fiber frequency comb. This represents the largest spectral gap directly spanned between two ultra-stable lasers by a frequency comb to date.