Turnkey compact frequency standard at 1556 nm based on Rb two-photon transitions

DiCOS Technologies has developed a high coherence fully automated absolute frequency standard for metrology applications. It uses a 1556 nm narrow linewidth DFB fiber laser locked to a two-photon transition in rubidium 85 at 778 nm after second harmonic generation in a non-linear waveguide crystal. Its main features and performances are presented in this paper