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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 3 — Feb. 10, 2014
  • pp: 3468–3474
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A multiple-input-multiple-output visible light communication system based on VCSELs and spatial light modulators

Hai-Han Lu, Ying-Pyng Lin, Po-Yi Wu, Chia-Yi Chen, Min-Chou Chen, and Tai-Wei Jhang  »View Author Affiliations


Optics Express, Vol. 22, Issue 3, pp. 3468-3474 (2014)
http://dx.doi.org/10.1364/OE.22.003468


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Abstract

A multiple-input-multiple-output (MIMO) visible light communication (VLC) system employing vertical cavity surface emitting laser (VCSEL) and spatial light modulators (SLMs) with 16-quadrature amplitude modulation (QAM)-orthogonal frequency-division multiplexing (OFDM) modulating signal is proposed and experimentally demonstrated. The transmission capacity of system is significantly increased by space-division demultiplexing scheme. With the assistance of low noise amplifier (LNA) and data comparator, good bit error rate (BER) performance, clear constellation map, and clear eye diagram are achieved for each optical channel. Such a MIMO VLC system would be attractive for providing services including data and telecommunication services. Our proposed system is suitably applicable to the lightwave communication system in wireless transmission.

© 2014 Optical Society of America

1. Introduction

2. Experimental setup

3. Experimental results and discussions

A functional block of the data comparator is illustrated in Fig. 4
Fig. 4 A block diagram of the data comparator, in which including a fast comparator.
, in which including an amplitude comparator and a phase comparator. Let data signal d(n) has an amplitude a(n) and a phase θ(n):
d(n)=a(n)ejθ(n)
(4)
After transmission through a free-space link, the received data signal der(n) has a distorted amplitude aer(n) and a distorted phase error θer(n):
der(n)=aer(n)ejθer(n)
(5)
The data comparator has to estimate d(n) from der(n) by error feedback. For amplitude compensation, the output of the amplitude compensator is compared with a stored copy of a(n) to create an amplitude error. For phase compensation, the output of the phase compensator is compared with a stored copy of θ(n) to create a phase error. Amplitude and phase error compensations are crucial for ensuring maximum distortion suppression, the use of data comparator offers significant amplitude and phase error compensations.

To evaluate the transmitted 16-QAM OFDM signal performance, the measured BER curves and constellation map at a data stream of 2.5Gbps/2.5GHz are present in Fig. 5
Fig. 5 The measured BER curves and constellation map at a data stream of 2.5Gbps/2.5GHz.
. At a free-space transmission distance of 15 m; without employing LNA and data comparator, the BER is about 10−2; with employing LNA and data comparator, the BER is reached down to 10−6. As LNA and data comparator are employed simultaneously, low BER value and clear constellation map are obtained. Error free transmission is achieved to demonstrate the possibility of establishing a 4-channel 16-QAM OFDM MIMO VLC system. To show a more direct association with LNA and data comparator, we remove one of the schemes and measure the BER value. It can be seen that the BER performance improvement is limited as only one improvement scheme is employed. Such results indicate that LNA and data comparator play important roles for errors corrections. They can further improve the signal-to-noise ratio (SNR) of system, leading to the improvement of BER performance.

4. Conclusions

Acknowledgment

The authors would like to thank the financial support from the National Science Council of Taiwan under Grant NSC 100-2221-E-027-067-MY3, NSC 101-2221-E-027-040 -MY3, and NSC 102-2218-E-027-002.

References and links

1.

F. M. Wu, C. T. Lin, C. C. Wei, C. W. Chen, Z. Y. Chen, and H. T. Huang, “3.22-Gb/s WDM visible light communication of a single RGB LED employing carrier-less amplitude and phase modulation,” Conf. on Opt. Fiber Commun. (OFC) OTh1G4 (2013).

2.

Y. F. Liu, Y. C. Chang, C. W. Chow, and C. H. Yeh, “Equalization and pre-distorted schemes for increasing data rate in-door visible light communication system,” Conf. on Opt. Fiber Commun (OFC) JWA83 (2011).

3.

T. Komine and M. Nakagawa, “Fundamental analysis for visible-light communication system using LED lights,” IEEE Trans. Consum. Electron. 50(1), 100–107 (2004). [CrossRef]

4.

Y. Wang, Y. Wang, N. Chi, J. Yu, and H. Shang, “Demonstration of 575-Mb/s downlink and 225-Mb/s uplink bi-directional SCM-WDM visible light communication using RGB LED and phosphor-based LED,” Opt. Express 21(1), 1203–1208 (2013). [CrossRef] [PubMed]

5.

C. H. Yeh, Y. F. Liu, C. W. Chow, Y. Liu, P. Y. Huang, and H. K. Tsang, “Investigation of 4-ASK modulation with digital filtering to increase 20 times of direct modulation speed of white-light LED visible light communication system,” Opt. Express 20(15), 16218–16223 (2012). [CrossRef]

6.

C. Y. Chen, P. Y. Wu, H. H. Lu, Y. P. Lin, J. Y. Wen, and F. C. Hu, “Bidirectional 16-QAM OFDM in-building network over SMF and free-space VLC transport,” Opt. Lett. 38(13), 2345–2347 (2013). [CrossRef] [PubMed]

7.

W. Y. Lin, C. Y. Chen, H. H. Lu, C. H. Chang, Y. P. Lin, H. C. Lin, and H. W. Wu, “10m/500 Mbps WDM visible light communication systems,” Opt. Express 20(9), 9919–9924 (2012). [CrossRef] [PubMed]

8.

J. Carpenter, B. C. Thomsen, and T. D. Wilkinson, “Degenerate mode-group division multiplexing,” IEEE /OSA J. Lightwave Technol. 30(24), 3946–3952 (2012). [CrossRef]

9.

J. Carpenter, B. C. Thomsen, and T. D. Wilkinson, “Mode division multiplexing of modes with the same Azimuthal index,” IEEE Photon. Technol. Lett. 24(21), 1969–1972 (2012). [CrossRef]

10.

Y. C. Chi, Y. C. Li, H. Y. Wang, P. C. Peng, H. H. Lu, and G. R. Lin, “Optical 16-QAM-52-OFDM transmission at 4 Gbit/s by directly modulating a coherently injection-locked colorless laser diode,” Opt. Express 20(18), 20071–20077 (2012). [CrossRef] [PubMed]

11.

H. Henniger and O. Wilfert, “An introduction to free-space optical communications,” Radioengineering 19(2), 203–212 (2010).

12.

S. Bloom, “The physics of free-space optics,” AirFiber Inc 1-22 (2002).

OCIS Codes
(230.6120) Optical devices : Spatial light modulators
(250.7260) Optoelectronics : Vertical cavity surface emitting lasers
(060.2605) Fiber optics and optical communications : Free-space optical communication

ToC Category:
Optical Communications

History
Original Manuscript: October 18, 2013
Revised Manuscript: January 16, 2014
Manuscript Accepted: February 2, 2014
Published: February 6, 2014

Citation
Hai-Han Lu, Ying-Pyng Lin, Po-Yi Wu, Chia-Yi Chen, Min-Chou Chen, and Tai-Wei Jhang, "A multiple-input-multiple-output visible light communication system based on VCSELs and spatial light modulators," Opt. Express 22, 3468-3474 (2014)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-22-3-3468


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References

  1. F. M. Wu, C. T. Lin, C. C. Wei, C. W. Chen, Z. Y. Chen, and H. T. Huang, “3.22-Gb/s WDM visible light communication of a single RGB LED employing carrier-less amplitude and phase modulation,” Conf. on Opt. Fiber Commun. (OFC) OTh1G4 (2013).
  2. Y. F. Liu, Y. C. Chang, C. W. Chow, and C. H. Yeh, “Equalization and pre-distorted schemes for increasing data rate in-door visible light communication system,” Conf. on Opt. Fiber Commun (OFC) JWA83 (2011).
  3. T. Komine, M. Nakagawa, “Fundamental analysis for visible-light communication system using LED lights,” IEEE Trans. Consum. Electron. 50(1), 100–107 (2004). [CrossRef]
  4. Y. Wang, Y. Wang, N. Chi, J. Yu, H. Shang, “Demonstration of 575-Mb/s downlink and 225-Mb/s uplink bi-directional SCM-WDM visible light communication using RGB LED and phosphor-based LED,” Opt. Express 21(1), 1203–1208 (2013). [CrossRef] [PubMed]
  5. C. H. Yeh, Y. F. Liu, C. W. Chow, Y. Liu, P. Y. Huang, H. K. Tsang, “Investigation of 4-ASK modulation with digital filtering to increase 20 times of direct modulation speed of white-light LED visible light communication system,” Opt. Express 20(15), 16218–16223 (2012). [CrossRef]
  6. C. Y. Chen, P. Y. Wu, H. H. Lu, Y. P. Lin, J. Y. Wen, F. C. Hu, “Bidirectional 16-QAM OFDM in-building network over SMF and free-space VLC transport,” Opt. Lett. 38(13), 2345–2347 (2013). [CrossRef] [PubMed]
  7. W. Y. Lin, C. Y. Chen, H. H. Lu, C. H. Chang, Y. P. Lin, H. C. Lin, H. W. Wu, “10m/500 Mbps WDM visible light communication systems,” Opt. Express 20(9), 9919–9924 (2012). [CrossRef] [PubMed]
  8. J. Carpenter, B. C. Thomsen, T. D. Wilkinson, “Degenerate mode-group division multiplexing,” IEEE /OSA J. Lightwave Technol. 30(24), 3946–3952 (2012). [CrossRef]
  9. J. Carpenter, B. C. Thomsen, T. D. Wilkinson, “Mode division multiplexing of modes with the same Azimuthal index,” IEEE Photon. Technol. Lett. 24(21), 1969–1972 (2012). [CrossRef]
  10. Y. C. Chi, Y. C. Li, H. Y. Wang, P. C. Peng, H. H. Lu, G. R. Lin, “Optical 16-QAM-52-OFDM transmission at 4 Gbit/s by directly modulating a coherently injection-locked colorless laser diode,” Opt. Express 20(18), 20071–20077 (2012). [CrossRef] [PubMed]
  11. H. Henniger, O. Wilfert, “An introduction to free-space optical communications,” Radioengineering 19(2), 203–212 (2010).
  12. S. Bloom, “The physics of free-space optics,” AirFiber Inc 1-22 (2002).

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