S. Ö. Arik, D. Askarov, J. M. Kahn, "Effect of mode coupling on
signal processing complexity in mode-division multiplexing," J. Lightw. Technol. 31, 423-431 (2013).

S. Warm, K. Petermann, "Splice loss requirements in
multi-mode fiber mode-division-multiplex transmission links," Opt. Exp. 21, 519-532 (2013).

A. Mecozzi, C. Antonelli, M. Shtaif, "Coupled Manakov equations in
multimode fibers with strongly coupled groups of modes," Opt. Exp. 20, 23436-23441 (2012).

K. P. Ho, J. M. Kahn, "Delay-spread distribution for
multimode fiber with strong mode coupling," IEEE
Photon. Technol. Lett. 24, 1906-1909 (2012).

A. Lobato, F. Ferreira, M. Kuschnerov, D. van den Borne, S. L. Jansen, A. Napoli, B. Spinnler, B. Lankl, "Impact of mode coupling on the mode-dependent loss tolerance
in few-mode fiber transmission," Opt. Exp. 20, 29776-29783 (2012).

A. Li, A. A. Amin, X. Chen, S. Chen, G. Gao, W. Shieh, "Reception of dual-spatial-mode
CO-OFDM signal over a two-mode fiber," J. Lightw.
Technol. 30, 634-640 (2012).

R. Ryf, S. Randel, A. H. Gnauck, C. Bolle, A. Sierra, S. Mumtaz, M. Esmaeelpour, E. C. Burrows, R.-J. Essiambre, P. J. Winzer, D. W. Peckham, A. H. McCurdy, R. Lingle, "Mode-division multiplexing over 96 km of few-mode fiber
using coherent 6×6 MIMO processing," J. Lightw. Technol. 30, 521-531 (2012).

L. Gruner-Nielsen, Y. Sun, J. W. Nicholson, D. Jakobsen, K. G. Jespersen, R. Lingle, B. Palsdottir, "Few mode transmission fiber with low DGD,
low mode coupling, and low loss," J. Lightw.
Technol. 30, 3693-3698 (2012).

C. Koebele, M. Salsi, D. Sperti, P. Tran, P. Brindel, H. Margoyan, S. Bigo, A. Boutin, F. Verluise, P. Sillard, M. Bigot-Astruc, L. Provost, F. Cerou, G. Charlet, "Two mode transmission at 2×100 Gb/s,
over 40 km-long prototype few-mode fiber, using LCOS based mode multiplexer
and demultiplexer," Opt. Exp. 19, 16593-16600 (2011).

Q. B. Zhuge, C. Chen, D. V. Plant, "Dispersion-enhanced phase noise effects
on reduced-guard-interval CO-OFDM transmission," Opt.
Exp. 19, 4472-4484 (2011).

K.-P. Ho, J. M. Kahn, "Frequency diversity in mode-division
multiplexing systems," J. Lightw. Technol. 29, 3719-3726 (2011).

K. P. Ho, J. M. Kahn, "Statistics of group delays
in multimode fiber with strong mode coupling," J.
Lightw. Technol. 29, 3119-3128 (2011).

K.-P. Ho, J. M. Kahn, "Mode-dependent loss and gain:
Statistics and effect on mode-division multiplexing," Opt.
Exp. 19, 16612-16635 (2011).

P. J. Winzer, G. J. Foschini, "MIMO capacities and outage
probabilities in spatially multiplexed optical transport systems," Opt. Exp. 19, 16680-16696 (2011).

K.-P. Ho, "Effects of homodyne crosstalk
on dual-polarization QPSK signals," J. Lightw.
Technol. 29, 124-131 (2011).

A. P. T. Lau, T. S. R. Shen, W. Shieh, K. P. Ho, "Equalization-enhanced phase noise for 100 Gb/s transmission
and beyond with coherent detection," Opt. Exp. 18, 17239-17251 (2010).

C. Xie, "WDM coherent PDM-QPSK systems with and without
inline optical dispersion compensation," Opt.
Exp. 17, 4815-4823 (2009).

M. B. Shemirani, J. M. Kahn, "Higher-order modal dispersion
in graded-index multimode fiber," J. Lightw.
Technol. 27, 5461-5468 (2009).

T. Tao, V. H. Vu, "From the Littlewood-Offord problem to the
circular law: Universality of the spectral distribution of random matrices," Bull. Am. Math. Soc. 46, 337-396 (2009).

W. Shieh, K. P. Ho, "Equalization-enhanced phase noise for coherent-detection
systems using electronic digital signal processing," Opt.
Exp. 16, 15718-15727 (2008).

S. Fan, J. M. Kahn, "Principal modes in multimode
waveguides," Opt. Lett. 20, 135-137 (2006).

C. W. J. Beenaker, "Random-matrix theory of quantum
transport," Rev. Mod. Phys. 69, 731-808 (1997).

P. A. Mello, "Averages on the unitary group
and applications to the problem of disordered conductors," J. Phys., A: Math. Gen. 23, 4061-4080 (1990).

M. Creutz, "On invariant integration over SU(N)," J. Math. Phys. 19, 2043-2046 (1978).

E. Wigner, "Characteristic vectors of bordered
matrices with infinite dimensions," Ann. Math. 62, 548-564 (1955).

E. Wigner, "Characteristic vectors of bordered
matrices with infinite dimensions," Ann. Math. 62, 548-564 (1955).

T. Tao, V. H. Vu, "From the Littlewood-Offord problem to the
circular law: Universality of the spectral distribution of random matrices," Bull. Am. Math. Soc. 46, 337-396 (2009).

K. P. Ho, J. M. Kahn, "Delay-spread distribution for
multimode fiber with strong mode coupling," IEEE
Photon. Technol. Lett. 24, 1906-1909 (2012).

K. P. Ho, J. M. Kahn, "Statistics of group delays
in multimode fiber with strong mode coupling," J.
Lightw. Technol. 29, 3119-3128 (2011).

A. Li, A. A. Amin, X. Chen, S. Chen, G. Gao, W. Shieh, "Reception of dual-spatial-mode
CO-OFDM signal over a two-mode fiber," J. Lightw.
Technol. 30, 634-640 (2012).

L. Gruner-Nielsen, Y. Sun, J. W. Nicholson, D. Jakobsen, K. G. Jespersen, R. Lingle, B. Palsdottir, "Few mode transmission fiber with low DGD,
low mode coupling, and low loss," J. Lightw.
Technol. 30, 3693-3698 (2012).

K.-P. Ho, "Effects of homodyne crosstalk
on dual-polarization QPSK signals," J. Lightw.
Technol. 29, 124-131 (2011).

M. B. Shemirani, J. M. Kahn, "Higher-order modal dispersion
in graded-index multimode fiber," J. Lightw.
Technol. 27, 5461-5468 (2009).

R. Ryf, S. Randel, A. H. Gnauck, C. Bolle, A. Sierra, S. Mumtaz, M. Esmaeelpour, E. C. Burrows, R.-J. Essiambre, P. J. Winzer, D. W. Peckham, A. H. McCurdy, R. Lingle, "Mode-division multiplexing over 96 km of few-mode fiber
using coherent 6×6 MIMO processing," J. Lightw. Technol. 30, 521-531 (2012).

K.-P. Ho, J. M. Kahn, "Frequency diversity in mode-division
multiplexing systems," J. Lightw. Technol. 29, 3719-3726 (2011).

S. Ö. Arik, D. Askarov, J. M. Kahn, "Effect of mode coupling on
signal processing complexity in mode-division multiplexing," J. Lightw. Technol. 31, 423-431 (2013).

M. Creutz, "On invariant integration over SU(N)," J. Math. Phys. 19, 2043-2046 (1978).

P. A. Mello, "Averages on the unitary group
and applications to the problem of disordered conductors," J. Phys., A: Math. Gen. 23, 4061-4080 (1990).

K.-P. Ho, J. M. Kahn, "Mode-dependent loss and gain:
Statistics and effect on mode-division multiplexing," Opt.
Exp. 19, 16612-16635 (2011).

W. Shieh, K. P. Ho, "Equalization-enhanced phase noise for coherent-detection
systems using electronic digital signal processing," Opt.
Exp. 16, 15718-15727 (2008).

C. Xie, "WDM coherent PDM-QPSK systems with and without
inline optical dispersion compensation," Opt.
Exp. 17, 4815-4823 (2009).

Q. B. Zhuge, C. Chen, D. V. Plant, "Dispersion-enhanced phase noise effects
on reduced-guard-interval CO-OFDM transmission," Opt.
Exp. 19, 4472-4484 (2011).

A. P. T. Lau, T. S. R. Shen, W. Shieh, K. P. Ho, "Equalization-enhanced phase noise for 100 Gb/s transmission
and beyond with coherent detection," Opt. Exp. 18, 17239-17251 (2010).

C. Koebele, M. Salsi, D. Sperti, P. Tran, P. Brindel, H. Margoyan, S. Bigo, A. Boutin, F. Verluise, P. Sillard, M. Bigot-Astruc, L. Provost, F. Cerou, G. Charlet, "Two mode transmission at 2×100 Gb/s,
over 40 km-long prototype few-mode fiber, using LCOS based mode multiplexer
and demultiplexer," Opt. Exp. 19, 16593-16600 (2011).

A. Lobato, F. Ferreira, M. Kuschnerov, D. van den Borne, S. L. Jansen, A. Napoli, B. Spinnler, B. Lankl, "Impact of mode coupling on the mode-dependent loss tolerance
in few-mode fiber transmission," Opt. Exp. 20, 29776-29783 (2012).

S. Warm, K. Petermann, "Splice loss requirements in
multi-mode fiber mode-division-multiplex transmission links," Opt. Exp. 21, 519-532 (2013).

A. Mecozzi, C. Antonelli, M. Shtaif, "Coupled Manakov equations in
multimode fibers with strongly coupled groups of modes," Opt. Exp. 20, 23436-23441 (2012).

P. J. Winzer, G. J. Foschini, "MIMO capacities and outage
probabilities in spatially multiplexed optical transport systems," Opt. Exp. 19, 16680-16696 (2011).

S. Fan, J. M. Kahn, "Principal modes in multimode
waveguides," Opt. Lett. 20, 135-137 (2006).

C. W. J. Beenaker, "Random-matrix theory of quantum
transport," Rev. Mod. Phys. 69, 731-808 (1997).

M. L. Mehta, Random Matrices (Elsevier, 2004).

G. N. Watson, A Treatise of the Theory of Bessel
Functions (Cambridge Univ. Press, 1922).

Y. L. Yuke, Mathematical Functions and Their
Applications (Academic, 1975).

I. S. Gradshteyn, I. M. Ryzhik, Table of Integrals, Series, and
Products (Academic, 1979).

L. J. Slater, Generalized Hypergeometric Functions (Cambridge
Univ. Press, 1966).

A. Heck, Introduction to Maple (Springer, 2003).

K.-P. Ho, Phase-Modulated Optical Communication
Systems (Springer, 2005).

K.-P. Ho, J. M. Kahn, Optical Fiber Telecommunications VIB (Academic, 2013) pp. 491-568.

W. Shieh, "Interaction of laser phase
noise with differential-mode-delay in few-mode fibre based MIMO systems," Proc. OFC/NFOEC '12 (2012).