Abstract-Sub-terahertz photonic frequency divider with a large division ratio based on phase locking

 

Daming Han, Wei Wei, Zhangweiyi Liu, Weilin Xie, and Yi Dong

https://www.osapublishing.org/ol/abstract.cfm?uri=ol-46-17-4268

We present a photonic frequency divider with a large division ratio for microwave signals up to sub-terahertz. A high-operating frequency and a large frequency division ratio have both been achieved by phase-locking a Fabry–Perot frequency comb to the input signal that is to be divided. The input signals ranging from 50.10 GHz to 200.10 GHz are all divided to 2.5 GHz signals, which can be further divided into lower- frequency signals easily. The proposed divider is free of high-speed electrical devices, thanks to the intermediate-frequency detection and feedback control in the phase locking process. Moreover, the phase noise caused by the photonic frequency division is negligible at low offset frequencies, proving that the divider has superior long-term stability. This flexible, cost-efficient, and stable photonic frequency divider is an ideal candidate for frequency division at the remote end of a high-precision frequency transfer system.

© 2021 Optical Society of America

Abstract-Photonic generation of millimeter and terahertz waves with high phase stability

Dongning Sun, Yi Dong, Lilin Yi, Siwei Wang, Hongxiao Shi, Zongyang Xia, Weilin Xie, and Weisheng Hu  »View Author Affiliations

Optics Letters, Vol. 39, Issue 6, pp. 1493-1496 (2014)
http://dx.doi.org/10.1364/OL.39.001493

http://www.opticsinfobase.org/ol/abstract.cfm?uri=ol-39-6-1493

Optical generation of highly stable millimeter and terahertz waves is proposed and experimentally demonstrated. The optical-fiber-path-induced phase fluctuation is identically transferred to a 40 MHz intermediate frequency by using dual-heterodyne phase error transfer, then canceled by a phase-locked loop. Based on the scheme, highly stable signals within the frequency range from 25 GHz to 1 THz are generated, and the phase jitter is decreased from 2.05 rad to 4.7 mrad in the frequency range from 0.01 Hz to 1 MHz. For 1 THz, the residual phase noise reaches −60  dBc/Hz at 1 Hz frequency offset from the carrier, and the relative timing jitter is reduced to 0.7 fs.

© 2014 Optical Society of America