[1] Su Yulong, Wang Wei, Hu Xiaohong, et al. 10 Gbps DPSK transmission over free-space link in the mid-infrared [J]. Optics Express, 2018, 26: 34515-34528.

[2] Wang L L, Kowalcyzk T. A versatile bias control technique for any-point locking in Lithium Niobate Mach-Zehnder modulators [J]. Journal of Lightwave Technology, 2010, 28(11): 1703-1706.

[3] Yuan Xueguang, Zhang Yang′an, Zhang Jinnan, et al. Any bias point control scheme for Mach-Zehnder modulator based on phase dithering [C]//Asia Communications and Photonics Conference, OSA Technical Digest (online), 2017: Su2A.125.

[4] Min-Hyeong Kim, Byung-Min Yu, Woo-Young Choi. A Mach-Zehnder modulator bias controller based on OMA and average power monitoring [J]. IEEE Photonics Technology Letters, 2017,29(23): 2043-2046.

[5] Ning Jieyu, Dai Yitang, Yin Feifei, et al. Dither-free low-bias controller for deeply modulated Mach-Zehnder modulators[J]. Photonic Network Communications, 2016, 32(2): 259-265.

[6] Zhou Pengwei, Lu Tian, Zhang Yiyi, et al. Mach-Zehnder modulator bias controller based on power and harmonics synchronous detection [J]. Infrared and Laser Engineering, 2016, 45(12): 1220002. (in Chinese)

[7] Choi H, Takushima Y, Choi H Y, et al. Modulation-format-free bias control technique for MZ modulator based on differential phase monitor [C]//Optical Fiber Communication Conference & Exposition. IEEE, 2011.

[8] Sekine K, Hasegawa C, Kikuchi N, et al. A novel bias control technique for MZ modulator with monitoring power of backward light for advanced modulation formats [C]//Optical Fiber Communication and the National Fiber Optic Engineers Conference, 2007. OFC/NFOEC 2007. Conference on. IEEE, 2007.

[9] Li Xiaolei, Deng Lei, Chen Xiaoman, et al. Modulation-format-free and automatic bias control for optical IQ modulators based on dither-correlation detection [J]. Optics Express, 2017, 25: 9333-9345.

[10] Chen Lei. 100 G silicon optical modulator automatic bias control technology based on nonlinear effect compensation and thermal crosstalk effect compensation [J]. Opt Technol, 2018, 85: 173-178.

[11] Zhu X, Zheng Z, Zhang C, et al. Coherent detection-based automatic bias control of Mach-Zehnder modulators for various modulation formats [J]. Journal of Lightwave Technology, 2014, 32(14): 2502-2509.

[12] Li Xiaolei, Deng Lei, Chen Xiaoman, et al. Arbitrary bias point control technique for optical IQ modulator based on dither-correlation detection [J]. Journal of Lightwave Technology, 2018, 36(18): 3824-3836.

[13] Kawakami H, Yoshida, Miyamoto Y. Auto bias control technique based on asymmetric bias dithering for optical QPSK modulation [J]. Journal of Lightwave Technology, 2012, 30(7): 962-968.

[14] Gui T, Li C, Yang Q, et al. Auto bias control technique for optical OFDM transmitter with bias dithering [J]. Optics Express, 2013, 21(5): 5833-5841.

[15] Li Kewu, Wang Zhibin, Zhang Rui, et al. LiNbO3 transverse electro-optical modulation characteristics for light pass along optical axis [J]. Optics and Precision Engineering, 2015, 23(5): 1227-1232. (in Chinese)

[16] Kawakami H, Yoshida E, Miyamoto Y. Auto bias control technique for QPSK modulator with asymmetric bias dithering [C]//OECC 2010 Technical Digest, Sapporo, 2010: 458-459.

[17] Wang Xianbi, Li Ning, Lu Zhijia, et al. Properties of three types of carried-suppressed return-to-zero optical modulation formats [J]. Infrared and Laser Engineering, 2014, 43(11): 3694-3698. (in Chinese)

[18] Zhang Zhike, Chang Mingchao, Zhu Ninghua, et al. Investigation of CSRZ code in FSO communication[C]//SPIE, 2018, 10697: 106975F.