[1] Wielandy S, Fishteyn M, Zhu B. Optical performance monitoring using nonlinear detection[J]. Journal of Lightwave Technology, 22, 784-793(2004).

[2] O’Mahony M J, Politi C, Klonidis D et al. Future optical networks[J]. Journal of Lightwave Technology, 24, 4684-4696(2006).

[3] Dong Z H, Khan F N, Sui Q et al. Optical performance monitoring: a review of current and future technologies[J]. Journal of Lightwave Technology, 34, 525-543(2016).

[4] Li M Y, Wu J T, Yang J Y et al. Simplified multi-channel parallel optical performance monitoring based on deep learning[J]. Acta Optica Sinica, 43, 0715002(2023).

[5] Hauske F N, Kuschnerov M, Spinnler B et al. Optical performance monitoring in digital coherent receivers[J]. Journal of Lightwave Technology, 27, 3623-3631(2009).

[6] Soriano R A, Hauske F N, Gonzalez N G et al. Chromatic dispersion estimation in digital coherent receivers[J]. Journal of Lightwave Technology, 29, 1627-1637(2011).

[7] Yu Q, Pan Z Q, Yan L S et al. Chromatic dispersion monitoring technique using sideband optical filtering and clock phase-shift detection[J]. Journal of Lightwave Technology, 20, 2267-2271(2002).

[8] Madsen C K. Chromatic and polarization mode dispersion measurement technique using phase-sensitive sideband detection[C], MO6-22(2001).

[9] Wang J Y, Jiang X, He X et al. Ultra-wide range in-service chromatic dispersion measurement using coherent detection and digital signal processing[C], 13-16(2011).

[10] Sui Q, Lau A P T, Lu C. Fast and robust blind chromatic dispersion estimation using auto-correlation of signal power waveform for digital coherent systems[J]. Journal of Lightwave Technology, 31, 306-312(2013).

[11] Yao S C, Eriksson T A, Fu S N et al. Fast and robust chromatic dispersion estimation based on temporal auto-correlation after digital spectrum superposition[J]. Optics Express, 23, 15418-15430(2015).

[12] Xie C J. Chromatic dispersion estimation for single-carrier coherent optical communications[J]. IEEE Photonics Technology Letters, 25, 992-995(2013).

[13] Kozicki B, Takuya O, Hidehiko T. Optical performance monitoring of phase-modulated signals using asynchronous amplitude histogram analysis[J]. Journal of Lightwave Technology, 26, 1353-1361(2008).

[14] Zhao J, Lau A P T, Qureshi K K et al. Chromatic dispersion monitoring for DPSK systems using RF power spectrum[J]. Journal of Lightwave Technology, 27, 5704-5709(2009).

[15] Cheng L H, Li Z H, Lu C et al. Chromatic dispersion monitoring based on variance of received optical power[J]. IEEE Photonics Technology Letters, 23, 486-488(2011).

[16] Jargon J A, Wu X X, Choi H Y et al. Optical performance monitoring of QPSK data channels by use of neural networks trained with parameters derived from asynchronous constellation diagrams[J]. Optics Express, 18, 4931-4938(2010).

[17] Wang C X, Fu S N, Wu H et al. Joint OSNR and CD monitoring in digital coherent receiver using long short-term memory neural network[J]. Optics Express, 27, 6936-6945(2019).

[18] Xu J S, Zhao J, Li S et al. Optical performance monitoring in transparent fiber-optic networks using neural networks and asynchronous amplitude histograms[J]. Optics Communications, 517, 128305(2022).

[19] Yang F, Bai C L, Chi X Y et al. Intelligent joint multi-parameter optical performance monitoring scheme based on HT images and MT-ResNet for elastic optical network[J]. Optical Fiber Technology, 82, 103599(2024).

[20] Zhou H B, Li B R, Tang M et al. Fractional Fourier transformation-based blind chromatic dispersion estimation for coherent optical communications[J]. Journal of Lightwave Technology, 34, 2371-2380(2016).

[21] Ma Y W, Guo P, Yang A Y et al. Training sequence-based chromatic dispersion estimation with ultra-low sampling rate for optical fiber communication systems[J]. IEEE Photonics Journal, 10, 7204109(2018).

[22] Jiang T, Xiang Y T, Wang L et al. Joint CD, DGD, and PDL estimation enabled by FrFT based time-frequency reconstruction[J]. Journal of Lightwave Technology, 41, 2623-2630(2023).

[23] Deng P C, Wang R, Yang H et al. Optical access network based on non-orthogonal multiple access and convolutional neural network[J]. Laser & Optoelectronics Progress, 59, 1306006(2022).