A Frequency-Stable Optoelectronic Oscillator Based on Passive Phase Compensation

Zhu, Xiang; Tao, Jin; Fu, Ying; Chi, Hao; Zuo, Lulu; Liu, Wei Min; Wang, Qihang

doi:10.1109/lpt.2020.2987924

IEEE Photon. Technol. Lett.

2020

DOI: 10.1109/lpt.2020.2987924

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A Frequency-Stable Optoelectronic Oscillator Based on Passive Phase Compensation

Xiang Zhu

Jin Tao

Ying Fu

et al.

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Cited by 4 publications

(1 citation statement)

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“…The basic idea is to develop a simple and efficient method to build a high-quality optoelectronic terahertz source for high-speed communications. Based on passive phase compensation (PPC) method, which is usually employed in the microwave photonic systems to cancel the phase jitter in a transmission link or an optoelectronic oscillator [15][16][17][18], the incoherent phase noise between two independent lasers can be well suppressed, by referring both of them to a free running OFC.…”

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confidence: 99%

Coherence enhancement between incoherent lasers based on passive phase compensation

Zhu,

Huang,

et al. 2024

Electronics Letters

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Coherent light beams play an important role in the development of opto‐electronic microwave and terahertz technologies, serving as a source for generating RF carrier signals with very high quality. The authors explore in this work an approach to enhance the coherence between two incoherent lasers so as to provide coherent light beams, and proof‐of‐concept demonstrates a terahertz signal generation with low phase noise. Based on the proposed passive phase compensation technique, the phase noise between two independent lasers can be well suppressed and the carrier to noise ratio in the terahertz regime remains high. In the experiment, the beating phase noise between two independent lasers is reduced from −60.68 dBc/Hz@10kHz to −90.05 dBc/Hz@10kHz at about 280 GHz, which is promisingly applicable in the terahertz photonics community.

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mentioning

confidence: 99%

Coherence enhancement between incoherent lasers based on passive phase compensation

Zhu,

Huang,

et al. 2024

Electronics Letters

Self Cite

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Optoelectronic oscillator for 5G wireless networks and beyond

Zou

Yang

et al. 2021

J. Phys. D: Appl. Phys.

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With the development of 5G wireless network and beyond, the wireless carrier frequency will definitely reach millimeter-wave (mm-wave) and even terahertz (THz). As one of the key elements in wireless networks, the local oscillator (LO) needs to operate at mm-wave and THz band with lower phase noise, which becomes a major challenge for commercial LOs. In this article, we investigate the recent developments of the electronic integrated circuit (EIC) oscillator and the optoelectronic oscillator (OEO), and especially investigate the prospect of OEO serving as a qualified LO in the 5G wireless network and beyond. Both the EIC oscillators and OEOs are investigated, including their basic theories of operation, representative techniques and some milestones in applications. Then, we compare the performances between the EIC oscillators and the OEOs in terms of frequency accuracy, phase noise, power consumption and cost. After describing the specific requirements of LO based on the standard of 5G and 6G wireless communication systems, we introduce an injection-locked OEO architecture which can be implemented to distribute and synchronize LOs. The OEO has better phase noise performance at high frequency, which is greatly desired for LO in 5G wireless network and beyond. Besides, the OEO provides an easy and low-loss method to distribute and synchronize mm-wave and THz LOs. Thanks to photonic integrated circuit development, the power consumption and cost

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Fast automatic frequency calibration assisted phase-locked highly stable optoelectronic oscillator

2021

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Highly stable, low phase noise microwave oscillators are essential for various applications. An optoelectronic oscillator (OEO) can overcome the short-term phase noise limitation of pure electronic oscillators at high oscillation frequency. Nonetheless, the long-term frequency stability should be addressed. To stabilize the frequency of OEO, a phase-locked loop (PLL) is widely used to synchronize the OEO to a stable reference. However, due to the narrow free-spectral-range (FSR) of the oscillation cavity of the OEO, the pull-in range of the PLL is limited. It is challenging to acquire phase-locking at startup and phase-relocking when mode-hopping of OEO occurs. Here, by using an automatic frequency calibration (AFC) assisted PLL, we attain a highly stable 10 GHz phase-locked OEO with robust phase-locking at startup and phase-relocking when mode-hopping of OEO occurs, for the first time. With the use of a fast digitally-controlled frequency shifter and a real-time frequency error detection unit in the AFC loop, the phase-locking and phase-relocking time are below 120 ms. Furthermore, it shows the phase noise of −135 dBc/Hz at 10 kHz offset, side-mode suppression ratio (SMSR) of 128 dBc, and Allan deviation of 4.8×10−11 at 5000 s for the phase-locked OEO. We thoroughly investigate the dynamics of the automatic frequency calibration, the phase-locking process, the phase-relocking after OEO mode-hopping, the system under vibration, and the frequency switching. Our approach is promising to generate a highly stable, low phase noise, and determinate frequency microwave signal, which can be used as a low phase noise reference for a microwave frequency synthesizer and high performance sampling clock for a data conversion system.

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A Frequency-Stable Optoelectronic Oscillator Based on Passive Phase Compensation

Cited by 4 publications

References 21 publications

Coherence enhancement between incoherent lasers based on passive phase compensation

Coherence enhancement between incoherent lasers based on passive phase compensation

Optoelectronic oscillator for 5G wireless networks and beyond

Fast automatic frequency calibration assisted phase-locked highly stable optoelectronic oscillator

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