Abstract

We report simultaneous transmission of six spatial and polarization modes, each carrying 40 Gb/s quadrature-phase-shift-keyed channels over 96 km of a low-differential group delay few-mode fiber. The channels are successfully recovered by offline DSP based on coherent detection and multiple-input multiple-output processing. A penalty of <1.2 dB is achieved by using 6 × 6 feed-forward equalizers with 120 taps each. The 6 × 6 impulse-response matrix fully characterizing the few-mode fiber is presented, revealing the coupling characteristics between the modes. The results are obtained using mode multiplexers based on phase plates with a mode selectivity of >28 dB.

© 2011 IEEE

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2011

P. J. Winzer, "Energy-efficient optical transport capacity scaling through spatial multiplexing," IEEE Photon. Technol. Lett. 23, 851-853 (2011).

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

S. Randel, R. Ryf, A. Sierra, P. J. Winzer, A. H. Gnauck, C. A. Bolle, R.-J. Essiambre, D. W. Peckham, A. McCurdy, R. Lingle, "6$\,\times\,$56-Gb/s mode-division multiplexed transmission over 33-km few-mode fiber enabled by 6$\,\times\,$6 MIMO equalization," Opt. Exp. 19, 16697-16707 (2011).

2010

R.-J. Essiambre, G. Kramer, P. J. Winzer, G. J. Foschini, B. Goebel, "Capacity limits of optical fiber networks," J. Lightw. Technol. 28, 662-701 (2010).

R. Tkach, "Scaling optical communications for the next decade and beyond," Bell Labs Tech. J. 14, 3-9 (2010).

2006

W. Mohammed, M. Pitchumani, A. Mehta, E. G. Johnson, "Selective excitation of the LP$_{11}$ mode in step index fiber using a phase mask," Opt. Eng. 45, 074602-1-074602-7 (2006).

2005

A. R. Shah, R. C. J. Hsu, A. Tarighat, A. H. Sayed, B. Jalali, "Coherent optical MIMO (COMIMO)," J. Lightw. Technol. 23, 2410-2419 (2005).

2003

S. Ramachandran, J. W. Nicholson, S. Ghalmi, M. F. Yan, "Measurement of multipath interference in the coherent crosstalk regime," IEEE Photon. Technol. Lett. 15, 1171-1173 (2003).

1994

1985

J. Salz, "Digital transmission over cross-coupled linear channels," AT&T Tech. J. 64, 1147-1159 (1985).

1983

A. J. Viterbi, A. M. Viterbi, "Nonlinear estimation of PSK-modulated carrier phase with application to burst digital transmission," IEEE Trans. Inf. Theory 29, 543-551 (1983).

1975

Appl. Opt.

AT&T Tech. J.

J. Salz, "Digital transmission over cross-coupled linear channels," AT&T Tech. J. 64, 1147-1159 (1985).

Bell Labs Tech. J.

R. Tkach, "Scaling optical communications for the next decade and beyond," Bell Labs Tech. J. 14, 3-9 (2010).

IEEE Photon. Technol. Lett.

P. J. Winzer, "Energy-efficient optical transport capacity scaling through spatial multiplexing," IEEE Photon. Technol. Lett. 23, 851-853 (2011).

S. Ramachandran, J. W. Nicholson, S. Ghalmi, M. F. Yan, "Measurement of multipath interference in the coherent crosstalk regime," IEEE Photon. Technol. Lett. 15, 1171-1173 (2003).

A. Sierra, S. Randel, P. J. Winzer, R. Ryf, A. H. Gnauck, R.-J. Essiambre, "On the use of delay-decorrelated I/Q test sequences for QPSK and QAM signals," IEEE Photon. Technol. Lett. .

IEEE Trans. Inf. Theory

A. J. Viterbi, A. M. Viterbi, "Nonlinear estimation of PSK-modulated carrier phase with application to burst digital transmission," IEEE Trans. Inf. Theory 29, 543-551 (1983).

J. Lightw. Technol.

R.-J. Essiambre, G. Kramer, P. J. Winzer, G. J. Foschini, B. Goebel, "Capacity limits of optical fiber networks," J. Lightw. Technol. 28, 662-701 (2010).

A. R. Shah, R. C. J. Hsu, A. Tarighat, A. H. Sayed, B. Jalali, "Coherent optical MIMO (COMIMO)," J. Lightw. Technol. 23, 2410-2419 (2005).

Opt. Eng.

W. Mohammed, M. Pitchumani, A. Mehta, E. G. Johnson, "Selective excitation of the LP$_{11}$ mode in step index fiber using a phase mask," Opt. Eng. 45, 074602-1-074602-7 (2006).

Opt. Exp.

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

S. Randel, R. Ryf, A. Sierra, P. J. Winzer, A. H. Gnauck, C. A. Bolle, R.-J. Essiambre, D. W. Peckham, A. McCurdy, R. Lingle, "6$\,\times\,$56-Gb/s mode-division multiplexed transmission over 33-km few-mode fiber enabled by 6$\,\times\,$6 MIMO equalization," Opt. Exp. 19, 16697-16707 (2011).

Opt. Lett.

Other

N. Benvenuto, G. Cherubini, Algorithms for Communications Systems and Their Applications (Wiley, 2002).

R. Ryf, S. Randel, A. H. Gnauck, C. Bolle, R.-J. Essiambre, P. J. Winzer, D. W. Peckham, A. McCurdy, R. Lingle, "Space-division multiplexing over 10 km of three-mode fiber using coherent 6$\,\times\,$6 MIMO processing," Proc. Opt. Fiber Commun. Conf./Nat. Fiber Opt. Eng. Conf. (2011) pp. 1-3.

V. A. Soifer, M. A. Golub, Laser Beam Mode Selection by Computer Generated Holograms (CRC Press, 1994).

J. A. Buck, Fundamentals of Optical Fibers (Wiley, 1995).

B. Franz, D. Suikat, R. Dischler, F. Buchali, H. Buelow, "High speed OFDM data transmission over 5 km GI-multimode fiber using spatial multiplexing with 2$\,\times\,$4 MIMO processing," Proc. 36th Eur. Conf. Opt. Commun. (2010) pp. 1-3.

G. Keiser, Optical Fiber Communications (McGraw Hill, 2000).

D. Marcuse, Theory of Dielectric Optical Waveguides (Academic, 1991).

Y. Awaji, N. Wada, Y. Toda, "Demonstration of spatial mode division multiplexing using Laguerre–Gaussian mode beam in telecom-wavelength," Proc. IEEE 23rd Annu. Meet. Photon. Soc. (2010) pp. 551-552.

A. Chraplyvy, "The coming capacity crunch," presented at the 35th Eur. Conf. Opt. Commun. ViennaAustria (2009).

M. de Boer, C. P. Tsekrekos, A. Martinez, H. Kurniawan, J. W. M. Bergmans, A. M. J. Koonen, H. P. A. van den Boom, F. M. J. Willems, "A first demonstrator for a mode group diversity multiplexing communication system," IEE Seminar Optical Fibre Commun. Electron. Signal Process. LondonU.K. (2005).

S. Schöllmann, S. Soneff, W. Rosenkranz, "10.7 Gb/s over 300 m GI-MMF using a 2$\,\times\,$2 MIMO system based on mode group diversity multiplexing," Proc. Opt. Fiber Commun./Nat. Fiber Opt. Eng. Conf. (2007) pp. 1-2.

A. Li, A. Al Amin, X. Chen, W. Shieh, "Reception of mode and polarization multiplexed 107 Gb/s CO-OFDM signal over a two-mode fiber," Proc. Opt. Fiber Commun. Conf. Expo./Nat. Fiber Opt. Eng. Conf. (2011) pp. 1-3.

M. Salsi, C. Koebele, D. Sperti, P. Tran, P. Brindel, H. Mardoyan, S. Bigo, A. Boutin, F. Verluise, P. Sillard, M. Bigot-Astruc, L. Provost, F. Cerou, G. Charlet, "Transmission at 2$\,\times\,$100 Gb/s, over two modes of 40 km-long prototype few-mode fiber, using LCOS based mode multiplexer and demultiplexer," Proc. Opt. Fiber Commun. Conf./Nat. Fiber Opt. Eng. Conf. Los AngelesCA (2011).

N. Hanzawa, K. Saitoh, T. Sakamoto, T. Matsui, S. Tomita, M. Koshiba, "Demonstration of mode-division multiplexing transmission over 10 km two-mode fiber with mode coupler," Proc. Opt. Fiber Commun. Conf. Expo./Nat. Fiber Opt. Eng. Conf. (2011) pp. 1-3.

B. Zhu, T. F. Taunay, M. Fishteyn, X. Liu, S. Chandrasekhar, M. F. Yan, J. M. Fini, E. M. Monberg, F. V. Dimarcello, K. Abedin, P. W. Wisk, "Space-, wavelength-, polarization-division multiplexed transmission of 56 Tb/s over a 76.8 km seven-core fiber," Proc. Opt. Fiber Commun. Conf. Expo./Nat. Fiber Opt. Eng. Conf. (2011) pp. 1-3.

J. Sakaguchi, Y. Awaji, N. Wada, A. Kanno, T. Kawanishi, T. Hayashi, T. Taru, T. Kobayashi, M. Watanabe, "109 Tb/s (7$\,\times\,$97$\,\times\,$172 Gb/s SDM/WDM/PDM) QPSK transmission through 16.8 km homogeneous multi-core fiber," Proc. Opt. Fiber Commun. Conf. Expo./Nat. Fiber Opt. Eng. Conf. (2011) pp. 1-3.

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