1. Berdague, S., Mode division multiplexing in optical fibers, Berdague, S. and Facq, P., Eds., Appl. Opt., 1982, vol. 21, pp. 1950–1955.
2. Koonen, T., Mode group diversity multiplexing for multi-service in-house networks using multi-mode polymer optical fibre, Koonen, T., van den Boom, H., Willems, F., Bergmans, J., and Khoe, G.-D., Eds., Proc. IEEE/LEOS (Amsterdam), 2002, pp. 183–186.
3. Gibson, G., Courtial, J., Padgett, M., Vasnetsov, M., Pas’ko, V., Barnett, S., and Franke-Arnold, S., Freespace information transfer using light beams carrying orbital angular momentum, Opt. Express, 2004, vol. 12, no. 22, pp. 5448–5456.
4. Anguita, J.A., Neifeld, M.A., and Vasic, B.V., Turbulence-induced channel crosstalk in an orbital angular momentum-multiplexed free-space optical link, Appl. Opt., 2008, vol. 47, no. 13, pp. 2414–2429.
5. Khonina, S.N., Kazanskiy, N.L., and Soifer, V.A., Optical vortices in a fiber: Mode division multiplexing and multimode self-imaging, Recent Progress in Optical Fiber Research, Dr Moh. Yasin, Ed., InTech, 2012.