Chinese Optics, Volume. 18, Issue 3, 661(2025)
Ultralow residual phase noise frequency synthesizer for space gravitational wave detection
Fig. 2. (a) Principle diagram and (b) spectrum diagram of a 24th-order direct frequency multiplier. Illustration: physical photo of the 24th-order frequency multiplier. The RBW and VBW of the spectrum analyzer are both 91 Hz
Fig. 3. (a) Principle diagram and (b) spectrum diagram of a 2.4 GHz PDRO. Illustration: physical photo of the 2.4 GHz PDRO. The RBW and VBW of the spectrum analyzer are both 91 Hz
Fig. 4. The absolute phase noise of the frequency synthesizer system and key components. Illustration: absolute phase noise test configuration
Fig. 6. Residual phase noise of the 2.4 GHz frequency synthesizer system
Fig. 7. Residual phase noise of the 75 MHz frequency synthesizer system and key components. Illustration: residual phase noise in the 1 mHz–100 mHz range
Fig. 8. Experimental results of phase temperature sensitivity. (a) and (c) represent temperature variation sequence; (b) temperature sensitivity of the output microwave phase in the 24-order frequency multiplication system; (d) temperature sensitivity of the output microwave phase in the PDRO
Fig. 9. Residual frequency stability of the frequency synthesizer system and the theoretical limit
Table 1. Residual phase noise measurement results and Taiji program requirements
(rad·Hz \begin{document}${}^{-\frac{1}{2}} $\end{document} View tableView in ArticleTable 1. Residual phase noise measurement results and Taiji program requirements
(rad·Hz \begin{document}${}^{-\frac{1}{2}} $\end{document} 频偏 太极计划残余相噪 需求 2.4 GHz频综 残余相噪 75 MHz频综 残余相噪 0.1 mHz $ 5.79\times {10}^{-3} $ $ \leqslant 1.06\times {10}^{-3} $ $ 1.06\times {10}^{-3} $ 1 mHz $ 5.93\times {10}^{-5} $ $ \leqslant 8.18\times {10}^{-5} $ $ 8.18\times {10}^{-5} $ 10 mHz $ 6.30\times {10}^{-6} $ $ 1.19\times {10}^{-6} $ $ 7.63\times {10}^{-6} $ 100 mHz $ 6.28\times {10}^{-6} $ $ 2.22\times {10}^{-7} $ $ 1.30\times {10}^{-6} $ 1 Hz $ 6.28\times {10}^{-6} $ $ 6.96\times {10}^{-8} $ $ 1.53\times {10}^{-7} $
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Lei-gang WANG, En-xue YUN, Xin LUO, Teng-hui YANG, Bi-song WANG, Si-yu SUN, Cheng-yun LI, Jun-liang LIU, Rui-hong GAO, Feng ZHAO, Shou-gang ZHANG. Ultralow residual phase noise frequency synthesizer for space gravitational wave detection[J]. Chinese Optics, 2025, 18(3): 661
Category: Special Column on Space-based Gravitational Wave Detection
Received: Jan. 21, 2025
Accepted: --
Published Online: Jun. 16, 2025
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