RF ~ 100 GHz超低噪声可调谐信号的数字光子合成
Digital-photonic synthesis of ultra-low noise tunable signals from RF to 100 GHz
摘要：
通信和导航系统对更高数据速率和更好同步的需求需要开发新的宽带和可调源，其噪声性能超过传统振荡器和合成器所提供的性能。精密频率合成对于在下一代电信、高精度测量、雷达和传感等广泛应用中提供频率基准和定时至关重要。在这里，我们描述了一种基于光频分的数字光子合成器（DPS），它能够产生从近DC到100 GHz的广泛可调谐信号，其分数频率不稳定性为1/10^15。DPS导出信号的频谱纯度表示在W波段（100 GHz）中接近7个数量级的当前最新技术水平上的接近载波噪声性能的改进，以及在X波段（10 GHz）中高达5个数量级的改进。
英文摘要：
The demand for higher data rates and better synchronization in communication and navigation systems necessitates the development of new wideband and tunable sources with noise performance exceeding that provided by traditional oscillators and synthesizers. Precision synthesis is paramount for providing frequency references and timing in a broad range of applications including next-generation telecommunications, high precision measurement, and radar and sensing. Here we describe a digital-photonic synthesizer (DPS) based on optical frequency division that enables the generation of widely tunable signals from near DC to 100 GHz with a fractional frequency instability of 1 part in 10^15. The spectral purity of the DPS derived signals represents an improvement in close-to-carrier noise performance over the current state-of-the-art of nearly 7 orders of magnitude in the W-band (100 GHz), and up to 5 orders of magnitude in the X-band (10 GHz).
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