An erbium fiber-based femtosecond optical frequency comb stabilized to an Yb+ single-ion optical frequency standard was created. For the first time, a combination of an extra-cavity acousto-optic frequency modulator with fiber outputs and an intracavity electro-optic phase modulator based on a KTP crystal were used to stabilize offset frequency and one of the optical components of the Er:fiber femtosecond comb. As a result a locking bandwidth of 30 kHz for the optical comb offset frequency has been obtained. It is shown that the relative instability introduced by the stabilization and measurement systems into the output radio frequencies (in addition to the instability of the reference optical signal) is no worse than 5 × 10−14 for averaging times of 1 s and 2 × 10−16 for averaging times of 400 s.

No abstract

No abstract

A study of the influence of temperature fluctuations of individual blocks of a fiber femtosecond frequency comb (FFC) generator and of the entire system as a whole on its output radio frequencies has been carried out. A two-circuit system for thermal stabilization of the air inside the FFC housing was implemented. An additional system for thermal stabilization of the transport fiber, which is included in the measurement scheme (outside the FFC), was implemented. A significant temperature effect on the measured output frequencies of the FFS is shown. Thanks to all the thermal stabilization systems, it has been shown that the instability of the developed fiber FFC introduced into its output microwave frequencies (in addition to the instability of the reference optical standard) is no worse than 2 × 10−16 per 1000 s.