[1] G. P. Agrawal. Nonlinear Fiber Optics(2013).

[2] M. A. Foster, A. C. Turner, J. E. Sharping, B. S. Schmidt, M. Lipson, A. L. Gaeta. Broad-band optical parametric gain on a silicon photonic chip. Nature, 441, 960-963(2006).

[3] S. Zlatanovic, J. Park, S. Moro, J. Boggio. Mid-infrared wavelength conversion in silicon waveguides using ultracompact telecom-band-derived pump source. Nat. Photonics, 4, 561-564(2010).

[4] F. Parmigiani, P. Horak, Y. Jung, L. Grüner-Nielsen, T. Geisler, P. Petropoulos, D. J. Richardson. All-optical mode and wavelength converter based on parametric processes in a three-mode fiber. Opt. Express, 25, 33602-33609(2017).

[5] J. Demas, G. Prabhakar, T. He, S. Ramachandran, S. Ramachandran. Broadband and wideband parametric gain via intermodal four-wave mixing in optical fiber. Conference on Lasers and Electro-Optics, SM3M.1(2017).

[6] R. Essiambre, M. A. Mestre, R. Ryf, A. H. Gnauck, R. W. Tkach, A. R. Chraplyvy, Y. Sun, X. Jiang, R. Lingle. Experimental investigation of inter-modal four-wave mixing in few-mode fibers. IEEE Photon. Technol. Lett., 25, 539-542(2013).

[7] C. Lacava, M. A. Ettabib, G. Sharp, Y. Jung, P. Petropoulos, D. J. Richardson. Silicon photonics wavelength converter based on inter-modal four wave mixing Bragg scattering. 15th International Conference on Group IV Photonics (GFP), 99-100(2018).

[8] F. Poletti, P. Horak. Description of ultrashort pulse propagation in multimode optical fibers. J. Opt. Soc. Am. B, 25, 1645-1654(2008).

[9] A. B. Kalifa, A. B. Salem, R. Cherif. Multimode supercontinuum generation in As₂S₃ chalcogenide photonic crystal fiber. Frontier in Optics, JTu2A.18(2018).

[10] Z. S. Ezhaveh, M. Eftekhar, J. A. Lopez, M. Kolsik, H. L. Aviles, F. Wise, D. Christodoulides, R. A. Correa. Blue-enhaced supercontinuum generation in a graded-index fluorine-doped multimode fiber. Optical Fiber Communication Conference, Th3D.2(2018).

[11] R. Dupiol, K. Krupa, A. Tonello, M. Fabert, D. Modotto, S. Wabnitz, G. Millot, V. Couderc. Interplay of Kerr and Raman beam cleaning with a multimode microstructure fiber. Opt. Lett., 43, 587-590(2018).

[12] J. Demas, L. Rishøj, X. Liu, G. Prabhakar, S. Ramachandran. High-power, wavelength-tunable NIR all-fiber lasers via intermodal four-wave mixing. Conference on Lasers and Electro-Optics, JTh5A.8(2017).

[13] L. Rishøj, Y. Chen, P. Steinvurzel, K. Rottwitt, S. Ramachandran. High-energy fiber lasers at non-traditional colours, via intermodal nonlinearities. Conference on Lasers and Electro-Optics, CTu3M.6(2012).

[14] R. Guenard, K. Krupa, R. Dupiol, M. Fabert, A. Bendahmane, V. Kermene, A. Desfarges-Berthelemot, J. L. Auguste, A. Tonello, A. Barthélémy, G. Millot, S. Wabnitz, V. Couderc. Kerr self-cleaning of pulsed beam in an ytterbium doped multimode fiber. Opt. Express, 25, 4783-4792(2017).

[15] Y. Ding, J. Xu, H. Ou, C. Peucheret. Mode-selective wavelength conversion based on four-wave mixing in a multimode silicon waveguide. Opt. Express, 22, 127-135(2014).

[16] S. M. M. Friis, I. Begleris, Y. Jung, K. Rottwitt, P. Petropoulos, D. J. Richardson, P. Horak, F. Parmigiani. Inter-modal four-wave mixing study in a two-mode fiber. Opt. Express, 24, 30338-30349(2016).

[17] M. Guasoni, F. Parmigiani, D. J. Richardson. Novel fiber design for wideband conversion and amplification in multimode fibers. European Conference on Optical Communication(2017).

[18] O. F. Anjum, M. Guasoni, P. Horak, Y. Jung, P. Petropoulos, D. J. Richardson, F. Parmigiani. Polarization-insensitive four-wave-mixing-based wavelength conversion in few-mode optical fibers. J. Lightwave Technol., 36, 3678-3683(2018).

[19] S. Signorini, M. Mancinelli, M. Bernard, M. Ghulinyan, G. Pucker, L. Pavesi. Broad wavelength generation and conversion with multi modal four wave mixing in silicon waveguides. Group IV Photonics, 59-60(2017).

[20] R. Dupiol, A. Bendahmane, K. Krupa, A. Tonello, M. Fabert, B. Kibler, T. Sylvestre, A. Barthelemy, V. Couderc, S. Wabnitz, G. Millot. Far-detuned cascaded intermodal four-wave mixing in a multimode fiber. Opt. Lett., 42, 1293-1296(2017).

[21] J. Yuan, Z. Kang, X. Zhang, X. Sang, B. Yan, F. Li, K. Wang, C. Yu, H. Y. Tam, P. K. A. Wai. Experimental demonstration of intermodal four-wave mixing by femtosecond pump pulses at 1550  nm. J. Lightwave Technol., 35, 2385-2390(2017).

[22] C. Lacava, S. Stankovic, A. Khokhar, T. Bucio, F. Gardes, G. Reed, D. Richardson, P. Petropoulos. Si-rich silicon nitride for nonlinear signal processing applications. Sci. Rep., 7, 22(2017).

[23] K. Uesaka, K. K.-Y. Wong, M. E. Marhic, L. G. Kazovsky. Wavelength exchange in a highly nonlinear dispersion-shifted fiber: theory and experiments. IEEE J. Sel. Top. Quantum Electron., 8, 560-568(2002).

[24] A. C. Turner, C. Manolatou, B. S. Schmidt, M. Lipson, M. A. Foster, Y. Okawachi, A. L. Gaeta. Tailored anomalous group-velocity dispersion in silicon waveguides. Opt. Express, 14, 4357-4362(2006).

[25] F. Parmigiani, M. Guasoni, O. F. Anjum, P. Horak, Y. Jung, L. Gruner-Nielsen, P. Petropoulos, D. J. Richardson. Polarization insensitive wavelength conversion in a few mode fibre. European Conference on Optical Communication, W2F2(2017).

[26] J. B. Christensen, J. G. Koefoed, B. A. Bell, C. J. McKinstrie, K. Rottwitt. Shape-preserving and unidirectional frequency conversion using four-wave mixing Bragg scattering. Opt. Express, 26, 17145-17157(2018).

[27] B. Bell, C. Xiong, D. Marpaung, C. McKinstrie, B. Eggleton. Uni-directional wavelength conversion in silicon using four-wave mixing driven by cross-polarized pumps. Opt. Lett., 42, 1668-1671(2017).

[28] D. Méchin, R. Provo, J. D. Harvey, C. J. McKinstrie. 180-nm wavelength conversion based on Bragg scattering in an optical fiber. Opt. Express, 14, 8995-8999(2006).

[29] Y. Xiao, R.-J. Essiambre, M. Desgroseilliers, A. M. Tulino, R. Ryf, S. Mumtaz, G. P. Agrawal. Theory of intermodal four-wave mixing with random linear mode coupling in few-mode fibers. Opt. Express, 22, 32039-32059(2014).