[1] KIM J, COX J A, CHEN J et al. Drift-free femtosecond timing synchronization of remote optical and microwave sources[J]. Nature Photonics, 2, 733-736(2008).

[2] GHELFI P, LAGHEZZA F, SCOTTI F et al. A fully photonics-based coherent radar system[J]. Nature, 507, 341-345(2014).

[3] MINASIAN R A. Ultra-wideband and adaptive photonic signal processing of microwave signals[J]. IEEE Journal of Quantum Electronics, 52, 1-13(2016).

[4] YAO X S, MALEKI L. Optoelectronic microwave oscillator[J]. Journal of the Optical Society of America B, 13, 1725-1735(1996).

[5] FAN Zhiqiang, QIU Qi, SU Jun et al. Research progress on phase noise and frequency stability of opto-electronic oscillator[J]. Journal of Applied Optics, 38, 562-568(2017).

[6] PENG H, ZHANG C, XIE X et al. Tunable DC-60 GHz RF generation utilizing a dual-loop optoelectronic oscillator based on stimulated brillouin scattering[J]. Journal of Lightwave Technology, 33, 1(2015).

[7] XIE X, ZHANG C, SUN T et al. Wideband tunable optoelectronic oscillator based on a phase modulator and a tunable optical filter[J]. Optics Letters, 38, 655-657(2013).

[8] YAO X S, MALEKI L. Multiloop optoelectronic oscillator[J]. IEEE Journal of Quantum Electronics, 36, 79-84(2000).

[9] YANG J, JIN L Y, YAO T W et al. An optical domain combined dual-loop optoelectronic oscillator[J]. IEEE Photonics Technology Letters, 19, 807-809(2007).

[10] FLEYER M, SHERMAN A, HOROWITZ M et al. Wideband-frequency tunable optoelectronic oscillator based on injection locking to an electronic oscillator[J]. Optics Letters, 41, 1993-1996(2016).

[11] WEI M Z, BLASCHE G. Injection-locked dual opto-electronic oscillator with ultra-low phase noise and ultra-low spurious level[J]. IEEE Transactions on Microwave Theory and Techniques, 53, 929-933(2005).

[12] ZHANG J, LI L, WANG G et al. Parity-time symmetry in wavelength space within a single spatial resonator[J]. Nature Communications, 11, 3217(2020).

[13] YAO X S, DAVIS L, MALEKI L. Coupled optoelectronic oscillators for generating both RF signal and optical pulses[J]. Journal of Lightwave Technology, 18, 73-78(2000).

[14] DAI J, LIU A, LIU J et al. Supermode noise suppression with mutual injection locking for coupled optoelectronic oscillator[J]. Optics Express, 25, 27060-27066(2017).

[15] WANG Y, LIN C, LI X et al. Highly improved side mode suppression ratio and a low phase noise optoelectronic oscillator[J]. Applied Optics, 61, 4602-4609(2022).

[16] QIU J, WEI B, YANG L et al. Finely tunable coupled optoelectronic oscillator based on injection locking and phase locked loop[J]. Journal of Lightwave Technology, 41, 5863-5869(2023).

[17] XIAO K, SHEN X, JIN X et al. Super-mode noise suppression for coupled optoelectronic oscillator with optoelectronic hybrid filter[J]. Optics Communications, 426, 138-141(2018).

[18] LIU A, LI X, HUO S et al. Polarization-insensitive coupled optoelectronic oscillator with low spurious tones and phase noise[J]. Optics Express, 30, 8700-8708(2022).