S. Moon and D. Y. Kim, “Effective single-mode transmission at wavelengths shorter than the cutoff wavelength of an optical fiber,” IEEE Photon. Technol. Lett. 17(12), 2604–2606 (2005).
K. Y. Song, I. K. Hwang, S. H. Yun, and B. Y. Kim, “High performance fused-type mode-selective coupler using elliptical core two-mode fiber at 1550nm,” IEEE Photon. Technol. Lett. 14, 501–503 (2002).
F. Gonthier, “Fabrication of multiplexing and demultiplexing single-mode fiber optic couplers,” U.S. Patent No. 6,763,685 (2004).
A. Li, J. Ye, X. Chen, and W. Shieh, “Low-loss fused mode coupler for few-mode transmission,” in Optical Fiber Communication Conference/National Fiber Optic Engineers Conference 2013, OSA Technical Digest (online) (Optical Society of America, 2013), paper OTu3G.4.
L. Grüner-Nielsen, J. W. Nicholson, K. Jespersen, Y. Sun, R. Lingle, D. Jacobsen, and B. Pálsdóttir, “Measuring distributed mode scattering in few mode fibers with high and low differential group delay,” Proceedings of IEEE Photonics Society 2012 Sumer topical meeting, paper TuC1.3.
J. D. Love, W. M. Henry, W. J. Stewart, R. J. Black, S. Lacroix, and F. Gonthier, “Tapered single-mode fibres and devices - Part 1: Adiabaticity criteria,” IEE Proceedings-J 138, 343–354 (1991).
R. J. Black, S. Lacroix, F. Gonthier, and J. D. Love, “Tapered single-mode fibres and devices - Part 2: Experimental and theoretical quantification,” IEE Proceedings-J 138, 355–364 (1991).
W. J. Miller and D. L. Weidman, “Optical couplers with multilayer fibers,” U.S. Patent No. 6,272, 268 (2001).
D. L. Weidman and D. R. Young, “Fiber optic couplers exhibiting low nonadiabatic loss” U.S. Patent No. 5,412,745 (1995).
D. W. Stowe, “Wide band coupler,” U.S. Patent No. 4,997,248 (1991).
R. Ryf, M. A. Mestre, A. Gnauck, S. Randel, C. Schmidt, R. Essiambre, P. Winzer, R. Delbue, P. Pupalaikis, A. Sureka, Y. Sun, X. Jiang, D. Peckham, A. H. McCurdy, and R. Lingle, “Low-loss mode coupler for mode-multiplexed transmission in few-mode fiber,” in National Fiber Optic Engineers Conference, OSA Technical Digest (Optical Society of America, 2012), paper PDP5B.5.