Abstract

We describe a coherent optical MIMO transmission experiment that employs a digital coherent receiver with a mode convergence unit, which converges higher-order mode light into the fundamental mode while maintaining the phase and amplitude information of the higher-order mode. The coherent optical MIMO transmission of two 10 Gbit/s BPSK signals over 20 km of graded-index multi-mode fiber was successfully achieved by using this mode convergence unit. We also show numerically that multi channel signals for a coherent optical MIMO transmission can be recovered by employing sufficient mode diversity, even if mode conversion occurs in the transmission fiber.

© 2011 OSA

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References

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  1. T. Morioka, “New generation optical infrastructure technologies: ‘EXAT initiative’ towards 2020 and beyond,” in Opto-Electronics and Communications Conference (OECC, 2009), FT4.
  2. S. Berdagué and P. Facq, “Mode division multiplexing in optical fibers,” Appl. Opt. 21(11), 1950–1955 (1982).
    [CrossRef] [PubMed]
  3. N. Hanzawa, K. Saitoh, T. Sakamoto, T. Matsui, S. Tomita, and M. Koshiba, “Demonstration of mode-division multiplexing transmission over 10 km two-mode fiber with mode coupler,” in Optical Fiber Communication Conference (OFC, 2011), OWA4.
  4. H. R. Stuart, “Dispersive multiplexing in multimode optical fiber,” Science 289(5477), 281–283 (2000).
    [CrossRef] [PubMed]
  5. A. R. Shah, R. C. J. Hsu, A. Tarighat, A. H. Sayed, and B. Jalali, “Coherent optical MIMO (COMIMO),” J. Lightwave Technol. 23(8), 2410–2419 (2005).
    [CrossRef]
  6. A. Tarighat, R. C. J. Hsu, A. Shah, A. H. Sayed, and B. Jalali, “Fundamentals and challenges of optical multiple-input multiple-output multimode fiber links,” IEEE Commun. Mag. 45(5), 57–63 (2007).
    [CrossRef]
  7. B. Franz, D. Suikat, R. Dischler, F. Buchali, and H. Buelow, “High speed OFDM data transmission over 5 km GI-multimode fiber using spatial multiplexing with 2x4 MIMO processing,” in European Conference and Exhibition on Optical Communication (ECOC, 2010), Tu.3.C.4.
  8. R. Ryf, S. Randel, A. H. Gnauck, C. Bolle, R.-J. Essiambre, P. J. Winzer, D. W. Peckham, A. McCurdy, and R. Lingle, “Space-division multiplexing over 10 km of three-mode fiber using coherent 6 x 6 MIMO processing,” in Optical Fiber Communication Conference (OFC, 2011), PDPB10.
  9. J. Morikuni, P. Mena, B. K. Whitlock, and R. Scarmozzino, “Link-level design, analysis, and simulation of multimode data communication systems,” in Technical Proceedings of National Fiber Optic Engineers Conference (NFOEC, 2003), pp. 858–867.

2007

A. Tarighat, R. C. J. Hsu, A. Shah, A. H. Sayed, and B. Jalali, “Fundamentals and challenges of optical multiple-input multiple-output multimode fiber links,” IEEE Commun. Mag. 45(5), 57–63 (2007).
[CrossRef]

2005

2000

H. R. Stuart, “Dispersive multiplexing in multimode optical fiber,” Science 289(5477), 281–283 (2000).
[CrossRef] [PubMed]

1982

Berdagué, S.

Facq, P.

Hsu, R. C. J.

A. Tarighat, R. C. J. Hsu, A. Shah, A. H. Sayed, and B. Jalali, “Fundamentals and challenges of optical multiple-input multiple-output multimode fiber links,” IEEE Commun. Mag. 45(5), 57–63 (2007).
[CrossRef]

A. R. Shah, R. C. J. Hsu, A. Tarighat, A. H. Sayed, and B. Jalali, “Coherent optical MIMO (COMIMO),” J. Lightwave Technol. 23(8), 2410–2419 (2005).
[CrossRef]

Jalali, B.

A. Tarighat, R. C. J. Hsu, A. Shah, A. H. Sayed, and B. Jalali, “Fundamentals and challenges of optical multiple-input multiple-output multimode fiber links,” IEEE Commun. Mag. 45(5), 57–63 (2007).
[CrossRef]

A. R. Shah, R. C. J. Hsu, A. Tarighat, A. H. Sayed, and B. Jalali, “Coherent optical MIMO (COMIMO),” J. Lightwave Technol. 23(8), 2410–2419 (2005).
[CrossRef]

Sayed, A. H.

A. Tarighat, R. C. J. Hsu, A. Shah, A. H. Sayed, and B. Jalali, “Fundamentals and challenges of optical multiple-input multiple-output multimode fiber links,” IEEE Commun. Mag. 45(5), 57–63 (2007).
[CrossRef]

A. R. Shah, R. C. J. Hsu, A. Tarighat, A. H. Sayed, and B. Jalali, “Coherent optical MIMO (COMIMO),” J. Lightwave Technol. 23(8), 2410–2419 (2005).
[CrossRef]

Shah, A.

A. Tarighat, R. C. J. Hsu, A. Shah, A. H. Sayed, and B. Jalali, “Fundamentals and challenges of optical multiple-input multiple-output multimode fiber links,” IEEE Commun. Mag. 45(5), 57–63 (2007).
[CrossRef]

Shah, A. R.

Stuart, H. R.

H. R. Stuart, “Dispersive multiplexing in multimode optical fiber,” Science 289(5477), 281–283 (2000).
[CrossRef] [PubMed]

Tarighat, A.

A. Tarighat, R. C. J. Hsu, A. Shah, A. H. Sayed, and B. Jalali, “Fundamentals and challenges of optical multiple-input multiple-output multimode fiber links,” IEEE Commun. Mag. 45(5), 57–63 (2007).
[CrossRef]

A. R. Shah, R. C. J. Hsu, A. Tarighat, A. H. Sayed, and B. Jalali, “Coherent optical MIMO (COMIMO),” J. Lightwave Technol. 23(8), 2410–2419 (2005).
[CrossRef]

Appl. Opt.

IEEE Commun. Mag.

A. Tarighat, R. C. J. Hsu, A. Shah, A. H. Sayed, and B. Jalali, “Fundamentals and challenges of optical multiple-input multiple-output multimode fiber links,” IEEE Commun. Mag. 45(5), 57–63 (2007).
[CrossRef]

J. Lightwave Technol.

Science

H. R. Stuart, “Dispersive multiplexing in multimode optical fiber,” Science 289(5477), 281–283 (2000).
[CrossRef] [PubMed]

Other

T. Morioka, “New generation optical infrastructure technologies: ‘EXAT initiative’ towards 2020 and beyond,” in Opto-Electronics and Communications Conference (OECC, 2009), FT4.

N. Hanzawa, K. Saitoh, T. Sakamoto, T. Matsui, S. Tomita, and M. Koshiba, “Demonstration of mode-division multiplexing transmission over 10 km two-mode fiber with mode coupler,” in Optical Fiber Communication Conference (OFC, 2011), OWA4.

B. Franz, D. Suikat, R. Dischler, F. Buchali, and H. Buelow, “High speed OFDM data transmission over 5 km GI-multimode fiber using spatial multiplexing with 2x4 MIMO processing,” in European Conference and Exhibition on Optical Communication (ECOC, 2010), Tu.3.C.4.

R. Ryf, S. Randel, A. H. Gnauck, C. Bolle, R.-J. Essiambre, P. J. Winzer, D. W. Peckham, A. McCurdy, and R. Lingle, “Space-division multiplexing over 10 km of three-mode fiber using coherent 6 x 6 MIMO processing,” in Optical Fiber Communication Conference (OFC, 2011), PDPB10.

J. Morikuni, P. Mena, B. K. Whitlock, and R. Scarmozzino, “Link-level design, analysis, and simulation of multimode data communication systems,” in Technical Proceedings of National Fiber Optic Engineers Conference (NFOEC, 2003), pp. 858–867.

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Figures (10)

Fig. 1
Fig. 1

Experimental set-up for coherent optical 2 × 2 MIMO transmission over a 20 km GI-MMF.

Fig. 2
Fig. 2

Adaptive MIMO equalizer.

Fig. 3
Fig. 3

Impulse response of MMC at transmitter + 20 km GI-MMF.

Fig. 4
Fig. 4

Impulse response of 20 km GI-MMF + MMC at receiver. (a) Without MCU. (b) With MCU.

Fig. 5
Fig. 5

Constellation maps of coherent optical MIMO transmission over a 20 km GI-MMF. (a) Received signals. (b) Recovered signals.

Fig. 6
Fig. 6

Tap number vs. Q2-factor.

Fig. 7
Fig. 7

Simulation set-up for coherent optical 2 × 2 MIMO transmission over a 20 km GI-MMF.

Fig. 8
Fig. 8

Constellation maps of received signals (left) and recovered signals (right). (a) d offset = 0.1 μm. (b) d offset = 5.0 μm.

Fig. 9
Fig. 9

Impulse response. (a) Without mode conversions. (b) With mode conversions.

Fig. 10
Fig. 10

Constellation maps of received signals (left) and recovered signals (right) with mode conversions.

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