National Institute of Standards and Technology, 325 Broadway, Boulder, Colorado 80305, USA.
Opt Lett. 2011 Aug 15;36(16):3260-2. doi: 10.1364/OL.36.003260.
We present an optical frequency divider based on a 200 MHz repetition rate Er:fiber mode-locked laser that, when locked to a stable optical frequency reference, generates microwave signals with absolute phase noise that is equal to or better than cryogenic microwave oscillators. At 1 Hz offset from a 10 GHz carrier, the phase noise is below -100 dBc/Hz, limited by the optical reference. For offset frequencies >10 kHz, the phase noise is shot noise limited at -145 dBc/Hz. An analysis of the contribution of the residual noise from the Er:fiber optical frequency divider is also presented.
我们提出了一种基于 200MHz 重复率掺铒光纤锁模激光器的光频分器，当锁定到稳定的光频基准时，它可产生相位噪声优于或等同于低温微波振荡器的微波信号。在 10GHz 载波 1Hz 的偏移处，相位噪声低于-100dBc/Hz，受限于光基准。对于偏移频率>10kHz，相位噪声在-145dBc/Hz 处受限于散粒噪声。我们还分析了掺铒光纤光频分器的剩余噪声的贡献。
