[1] OHASHI M, MATSUO S, HAYASHI T et al. Optical fibers for space-division multiplexing[M]. Space-Division Multiplexing in Optical Communication Systems, 39-170(2022).

[2] TU Jiajing, QIAO Xihui, LONG Keping. Core arrangement method for few-mode multi-core fibres[J]. Acta Photonica Sinica, 46, 0106001(2017).

[3] WU Y, LUO H, CHENG M et al. Capacity expansion of chaotic secure transmission system based on coherent optical detection and space division multiplexing over multi-core fiber[J]. Optics Letters, 47, 726-729(2022).

[4] NAKAJIMA K, MATSUI T, SAITO K et al. Multi-core fiber technology: next generation optical communication strategy[J]. IEEE Communications Standards Magazine, 1, 38-45(2017).

[5] MATSUI T, SAGAE Y, SAKAMOTO T et al. Design and applicability of multi-core fibers with standard cladding diameter[J]. Journal of Lightwave Technology, 38, 6065-6670(2020).

[6] GASULLA I, BARRERA D, HERVáS J et al. Spatial division multiplexed microwave signal processing by selective grating inscription in homogeneous multicore fibers[J]. Scientific Reports, 7, 41727(2017).

[7] UREÑA M, GARCÍA S, HERRANZ J I et al. Experimental demonstration of dispersion-diversity multicore fiber optical beamforming[J]. Optics Express, 30, 32783-32790(2022).

[8] ZHAO Y, WANG C, ZHAO Z et al. A microwave photonics true-time-delay system using carrier compensation technique based on wavelength division multiplexing[C](2022).

[9] SHAHEEN S, GRIS-SÁNCHEZ I, GASULLA I. True-time delay line based on dispersion-flattened 19-core photonic crystal fiber[J]. Journal of Lightwave Technology, 38, 6237-6246(2020).

[10] MORANT M, TRINIDAD A, TANGDIONGGA E et al. Multi-beamforming provided by dual-wavelength true time delay PIC and multicore fiber[J]. Journal of Lightwave Technology, 38, 5311-5317(2020).

[11] LUÍS R S, PUTTNAM B J, MENDINUETA J M D et al. Impact of spatial channel skew on the performance of spatial-division multiplexed self-homodyne transmission systems[C](2015).

[12] PUTTNAM B J, LUÍS R S, RADEMACHER G et al. Characteristics of homogeneous multi-core fibers for SDM transmission[J]. APL Photonics, 4, 022804(2019).

[13] LUIS R S, PUTTNAM B J, RADEMACHER G et al. Compensation of inter-core skew in multi-core fibers with group velocity dispersion[J]. Optics Express, 29, 28104-28109(2021).

[14] SAKAMOTO T, MORI T, WADA M et al. Experimental and numerical evaluation of inter-core differential mode delay characteristic of weakly-coupled multi-core fiber[J]. Optics Express, 22, 31966-31976(2014).

[15] LEE H J, MOON H S, KCHOI S et al. Multi-core fiber interferometer using spatial light modulators for measurement of the inter-core group index differences[J]. Optics Express, 23, 12555-12561(2015).

[16] SASAKI Y, TAKENAGA K, AIKAWA K. Effect of bending on skew of multicore fibers and optical fiber ribbbons[C](2020).

[17] GARCÍA S, UREÑA M, GASULLA I. Bending and twisting effects on multicore fiber differential group delay[J]. Optics Express, 27, 31290-31298(2019).

[18] FU Xiaodong, PAN Hongfeng, FANG Honglian et al. Comparative research of optimized coupled mode and coupled power theory in weakly coupled disturbed multi-core fibers[J]. Acta Photonica Sinica, 51, 0406003(2022).

[19] GLOGE D. Weakly guiding fibers[J]. Applied Optics, 10, 2252-2258(1971).

[20] HU Lili, FENG Guoying, DONG Zheliang. Spatially and spectrally resolved fiber mode measurement method[J]. Infrared and Laser Engineering, 44, 2517-2522(2015).

[21] GARCÍA S, URENA M, GASULLA I. Bending and twisting effects on multicore fiber differential group delay[J]. Optics Express, 27, 31290-31298(2019).