Development of a photoelectric phase-locked loop model to better synchronize frequency combs and microwaves
| Autor: | Bo Liu, Sensen Meng, Xing Chen, Wanpeng Zhang, Hong Wu, Wei Lin, Yingxin Zhao, Wei-feng Zhou |
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| Rok vydání: | 2020 |
| Předmět: |
Physics
business.industry Phase (waves) Phase synchronization 01 natural sciences Phase detector Atomic and Molecular Physics and Optics Synchronization Physics::Geophysics 010309 optics Phase-locked loop Optics Orders of magnitude (time) 0103 physical sciences Phase noise Optoelectronics Electrical and Electronic Engineering business Engineering (miscellaneous) Microwave |
| Zdroj: | Applied optics. 59(19) |
| ISSN: | 1539-4522 |
| Popis: | The high phase coherence between ultralow-noise microwaves and ultrahigh-stable optical frequency combs (OFCs) is of both scientific and technological relevance for telecommunication, timekeeping, astronomy, and metrology. Here, a photoelectric phase-locked loop (PLL) model with ultralow phase noise based on the optical-microwave phase detector technique has been proposed and experimentally demonstrated. A detailed mathematical model for tight, real-time phase synchronization of OFCs and microwaves is developed to investigate the feasibility and analyze the characteristics of the phase-coherent system. We fabricate a compact PLL circuit with a proportional-integral-derivative regulator for the synchronization of an OFC to a microwave reference. Once synchronized, the long-term stability of the OFC agrees to 2.4 × 10 − 14 at a 1000 s averaging time, which is enhanced by more than 4 orders of magnitude. Besides, the OFC almost acquires the same frequency stability as the microwave source. The ability to better phase synchronize OFCs and microwaves enables a wide range of applications beyond the laboratory. |
| Databáze: | OpenAIRE |
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