Fiber-optic radio frequency transfer with enhanced frequency stability using fiber Brillouin amplifiers.

IF 3.2 2区 物理与天体物理 Q2 OPTICS
Optics express Pub Date : 2024-11-04 DOI:10.1364/OE.541349
Junwei Ren, Liang Hu, Jianping Chen, Guiling Wu
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引用次数: 0

Abstract

The frequency stability of long-distance two-way fiber-optic radio frequency (RF) transfer is directly affected by the optical signal-to-noise ratio (OSNR) of optical amplifiers. In this paper, we have proposed a stimulated Brillouin scattering (SBS)-based optical amplification scheme with high OSNR for two-way fiber-optic RF frequency transfer over single mode fibers (SMF). At the remote and local site, the modulated carrier transferred from the opposite was amplified and then frequency upshifted by Brillouin frequency shift (BFS) for pump generation. This approach can avoid the use of additional pump lasers and phase-locked loops for wavelength stabilization of the pump. The pump was injected into the fiber link and counter-propagated with the signal to amplify the modulated carrier. A 2.2 GHz RF signal transfer with the proposed SBS-based optical amplification schemes was demonstrated over a 100 km fiber link. The experimental results illustrated that the OSNR was increased by 35 dB and 32 dB at the local site and the remote site, respectively, compared to the results obtained with erbium-doped fiber amplifiers (EDFA)-based optical amplification. Benefiting from improved OSNR, the frequency stability was increased by more than one order of magnitude below 1000 s averaging time, and the phase noise was reduced to the noise floor below 0.1 Hz offset frequency. The proposed optical signal amplification approach has a potential application for transferring atomic clocks over long-haul fiber links.

利用光纤布里渊放大器提高频率稳定性的光纤射频传输。
长距离双向光纤射频(RF)传输的频率稳定性直接受到光放大器光信噪比(OSNR)的影响。本文提出了一种基于受激布里渊散射(SBS)的高信噪比光放大方案,用于单模光纤(SMF)上的双向光纤射频频率传输。在远端和本地站点,从相反方向传输的调制载波被放大,然后通过布里渊频移(BFS)进行频率上移,以产生泵浦。这种方法可以避免使用额外的泵浦激光器和锁相环来稳定泵浦的波长。泵浦被注入光纤链路,并与信号反向传播,以放大调制载波。在 100 千米的光纤链路上,演示了利用所提出的基于 SBS 的光放大方案传输 2.2 GHz 射频信号的情况。实验结果表明,与基于掺铒光纤放大器(EDFA)的光放大相比,本地站点和远程站点的 OSNR 分别提高了 35 dB 和 32 dB。得益于OSNR的提高,频率稳定性在1000 s平均时间以下提高了一个数量级以上,相位噪声降低到0.1 Hz偏移频率以下的本底噪声。拟议的光信号放大方法有望应用于通过长距离光纤链路传输原子钟。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Optics express
Optics express 物理-光学
CiteScore
6.60
自引率
15.80%
发文量
5182
审稿时长
2.1 months
期刊介绍: Optics Express is the all-electronic, open access journal for optics providing rapid publication for peer-reviewed articles that emphasize scientific and technology innovations in all aspects of optics and photonics.
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