Design of a Board-Level Integrated Multi-Channel Radio Frequency Source for the Transportable 40Ca+ Ion Optical Clock
Bin Wang, Yuanhang Yang, Huaqing Zhang, Ruming Hu, Haicen Mao, Yao Huang, Kelin Gao, Hua Guan
TL;DR
The paper presents a compact RF module for a transportable calcium ion optical clock, enabling precise timekeeping and quantum applications.
Contribution
A miniaturized multi-channel RF module with improved performance for transportable optical clocks is designed and implemented.
Findings
The RF module achieves a 20% volume reduction compared to commercial modules.
It provides a 1 GHz low-phase noise reference with a 4 μHz resolution up to 400 MHz.
The module outputs +33 dBm power at 100 MHz with improved phase noise and harmonic suppression.
Abstract
As one of the most precise timekeeping instruments ever developed, the optical clock will be used as the measuring equipment for the next generation of second definition. The demand for the miniaturization of optical clocks is progressively urgent. In this paper, a multi-channel radio frequency (RF) module with a 20% volume of the commercial module is designed and implemented for the transportable 40Ca+ ion optical clock. Based on the double-crystal oscillator interlocking technique, a 1 GHz low-phase noise reference source is developed for direct digital synthesis. Through the simulation and optimization of the signal link design, the frequency range of the low phase-noise RF signal can reach 0–400 MHz with a 4 μHz resolution. Through two-stage power amplifying with different kinds of filters, it can achieve an output power of up to +33 dBm (2 W) at 100 MHz with a 25 dB phase noise…
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Taxonomy
TopicsAdvanced Frequency and Time Standards · Advanced Fiber Laser Technologies · Atomic and Subatomic Physics Research