[1] [1] Seeds A J, Williams K J. Microwave photonics［J］. J. Lightwave Technol., 2006, 24(12): 4628-4641.

[2] [2] Nguyen T A, Chan E H W, Minasian R A. Photonic radio frequency memory using frequency shifting recirculating delay line structure［J］. J. Lightwave Technol., 2014, 32(1): 99-106.

[3] [3] Ye J, Peng J L, Jones R J, et al. Delivery of high-stability optical and microwave frequency standards over an optical fiber network［J］. J. Opt. Soc. Am. B, 2003, 20(7): 1459-1467.

[4] [4] Pan S L, Wei J, Zhang F Z. Passive phase correction for stable radio frequency transfer via optical fiber［J］. Photonic Netw. Commun., 2016, 31(2): 327-335.

[5] [5] Pinkert T J, Bll O, Willmann L, et al. Effect of soil temperature on optical frequency transfer through unidirectional dense-wavelength-division-multiplexing fiber-optic links［J］. Appl. Opt., 2015, 54(4): 728-738.