A radio-optical synthesiser intended for operation in a radio-frequency master oscillator with an optical He – Ne/CH₄ frequency standard (λ = 3.39 μm) is developed on the basis of a femtosecond erbium-doped fibre laser. The synthesiser generates equidistant harmonics in the frequency range of 1 – 10 GHz with stability determined by the optical frequency standard. A stable supercontinuum spectrum is formed in the range around 1.06 μm, which provides stable 24-hour operation of the synthesiser and is important for practical applications in off-laboratory conditions. A direct comparison of the output frequencies of two synthesisers shows that the up-grade of the fibre laser and detection system of femtosecond pulses results in the synthesiser intrinsic instability of 5 10⁻¹⁵ at the averaging time of 1 s. Such a value is by an order of magnitude less than that obtained in our earlier works.

在飞秒掺铒光纤激光器的基础上开发了一种用于在具有光学 He-Ne/CH ₄频率标准（λ = 3.39 μm）的射频主振荡器中运行的无线电光合成器。合成器在 1 – 10 GHz 的频率范围内产生等距谐波，其稳定性由光频率标准确定。在 1.06 μm 左右的范围内形成稳定的超连续谱，为合成器提供稳定的 24 小时运行，对于非实验室条件下的实际应用非常重要。两个合成器的输出频率的直接比较表明，光纤激光器和飞秒脉冲检测系统的升级导致合成器固有不稳定性为 5 10 ^-15平均时间为 1 s。这样的值比我们早期工作中获得的值小一个数量级。