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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 20 — Oct. 7, 2013
  • pp: 23655–23661
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Full-duplex lightwave transport systems based on long-haul SMF and optical free-space transmissions

Chia-Yi Chen, Hai-Han Lu, Ying-Pyng Lin, Po-Yi Wu, Kuan-Hung Wu, and Wei-Yuan Yaug  »View Author Affiliations


Optics Express, Vol. 21, Issue 20, pp. 23655-23661 (2013)
http://dx.doi.org/10.1364/OE.21.023655


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Abstract

A full-duplex lightwave transport system employing wavelength-division-multiplexing (WDM) and optical add-drop multiplexing techniques, as well as optical free-space transmission scheme is proposed and experimentally demonstrated. Over an 80-km single-mode fiber (SMF) and 2.4 m optical free-space transmissions, impressive bit error rate (BER) performance is obtained for long-haul fiber link and finite free-space transmission distance. Such a full-duplex lightwave transport system based on long-haul SMF and optical free-space transmissions has been successfully demonstrated, which cannot only present its advancement in lightwave application, but also reveal its simplicity and convenience for the real implementation. Our proposed systems are suitable for the lightwave communication systems in wired and wireless transmissions.

© 2013 Optical Society of America

1. Introduction

2. Experimental setup

Simultaneously, 1~10 Gbps upstream data stream is added to the fiber backbone and transmitted to the head-end. From the AP1 to the head-end (blue line in Fig. 1), the fiber transmission distance is 80 km; from the AP2 to the head-end (blue line in Fig. 1), the fiber transmission distance is 40 km. The upstream wavelength is selected by using a tunable optical band-pass filter (TOBPF), transmitted by a fiber transmitter, and detected by a broadband PD. The detected optical signal is then amplified by a push-pull amplifier, and passed through an adaptive filter for error correction. Eventually, the data signal is fed into a BERT for BER analysis.

3. Experimental results and discussions

In implementation the adaptive filter, first the transmitter send a data pattern with an arbitrary data length as a protocol; and at the receiving site, the adaptive filter has a stored copy of data signal before starting communication. Let d(n) has an amplitude a(n) and phase θ(n):
d(n)=a(n)ejθ(n)
(1)
After transmission through a free-space link, the received signal der(n) has a distorted amplitude aer(n) and phase error θer(n):
der(n)=aer(n)ejθer(n)
(2)
The adaptive filter 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. The use of adaptive filter offers significant amplitude and phase error compensations.

The received signals of 1 Gbps and 10 Gbps data channels from the head-end to the AP2, with respect to different distance from beam center are shown in Fig. 4(a)
Fig. 4 (a) The received signals of 1 Gbps and 10 Gbps data channels with respect to different distance from beam center. (b) The received signals of 1 Gbps and 10 Gbps data channels with respect to different beam radius.
. The distance from beam center refers to longitudinal distance from the beam center. It is clear that, for both cases, as the distance from beam center increases the BER value increases as well. An error-free operation of 10−9 can be achieved when the distance from beam center is smaller than 0.38m (10Gbps) and 2.4m (1Gbps), respectively. In addition, the received signals of 1 Gbps and 10 Gbps data channels from the head-end to the AP2, with respect to different beam radius are present in Fig. 4(b). It is obvious that, for both cases, as the beam radius increases the BER value increases as well. An error-free operation of 10−9 can be obtained as the beam radius is smaller than 0.28m (10Gbps) and 0.6m (1Gbps), respectively. These distance (0.38m → 2.4m) and radius (0.28m → 0.6m) improvements are due to the reduction of data stream (10Gbps → 1Gbps). The distance from beam center and beam radius under different data stream, at an error-free operation of 10−9, is present in Fig. 5
Fig. 5 The distance from beam center and beam radius under different data stream, at an error-free operation of 10−9.
. It can be seen that there is a trade-off between the distance from beam center/beam radius and the data stream. Error-free operation can always be achieved for different data stream with different distance from beam center and beam radius. Thereby, different data stream, distance from beam center, and beam radius can be selected according to system requirement.

4. Conclusions

A novel full-duplex lightwave transport system based on WDM and optical add-drop multiplexing techniques, as well as optical free-space transmission scheme is proposed and demonstrated. Impressive BER operation is achieved for long-haul fiber and finite free-space transmissions. This proposed that such a full-duplex lightwave transport system has been successfully demonstrated, which cannot only present its advancement in optical fiber integration with optical free-space applications, but also reveal its simplicity and convenience for the implementation. Our proposed systems are suitably applicable to the optical communication systems in optical fiber integration with optical free-space transmission schemes.

Acknowledgment

The authors would like to thank the financial support from the National Science Council of the Republic of China 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.

C. Y. Li, H. S. Su, C. H. Chang, H. H. Lu, P. Y. Wu, C. Y. Chen, and C. L. Ying, “Generation and transmission of BB/MW/MMW signals by cascading PM and MZM,” J. Lightwave Technol. 30(3), 298–303 (2012). [CrossRef]

2.

C. Y. Li, H. S. Su, C. Y. Chen, H. H. Lu, H. W. Chen, C. H. Chang, and C. H. Jiang, “Full-duplex lightwave transport systems employing phase-modulated RoF and intensity-remodulated CATV signals,” Opt. Express 19(15), 14000–14007 (2011). [CrossRef] [PubMed]

3.

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]

4.

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]

5.

C. W. Chow and Y. H. Lin, “Convergent optical wired and wireless long-reach access network using high spectral-efficient modulation,” Opt. Express 20(8), 9243–9248 (2012). [CrossRef] [PubMed]

6.

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,” In Proc. Opt. Fiber Commun. (OFC), JWA83 (2011).

7.

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,” In Proc. Opt. Fiber Commun. (OFC), OTh1G4 (2013).

8.

C. W. Chow, C. H. Yeh, Y. F. Liu, and Y. Liu, “Improved modulation speed of LED visible light communication system integrated to the main electricity network,” Electron. Lett. 47(15), 867–868 (2011). [CrossRef]

9.

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]

10.

F. Alsaadi and J. Elmirghani, “Performance evaluation of 2.5 Gbit/s and 5 Gbit/s optical wireless systems employing a two dimensional adaptive beam clustering method and imaging diversity detection,” IEEE J. Sel. Areas Comm. 27(8), 1507–1519 (2009). [CrossRef]

11.

J. Fadlullah and M. Kavehrad, “Indoor high-bandwidth optical wireless links for sensor networks,” J. Lightwave Technol. 28(21), 3086–3094 (2010).

12.

D. C. O'Brien, “Visible light communications: challenges and potential,” In Proc. IEEE Photon. Conf., 365–366 (2011).

13.

K. Wang, A. Nirmalathas, C. Lim, and E. Skafidas, “High-speed optical wireless communication system for indoor applications,” IEEE Photon. Technol. Lett. 23(8), 519–521 (2011). [CrossRef]

14.

H. H. Lu, S. J. Tzeng, and Y. L. Liu, “Intermodulation distortion suppression in a full-duplex radio-on-fiber ring network,” IEEE Photon. Technol. Lett. 16(2), 602–604 (2004). [CrossRef]

15.

M. R. Phillips and D. M. Ott, “Crosstalk caused by nonideal output filters in WDM lightwave systems,” IEEE Photon. Technol. Lett. 12(8), 1094–1096 (2000). [CrossRef]

16.

M. R. Phillips and D. M. Ott, “Crosstalk due to optical fiber nonliearities in WDM CATV lightwave systems,” J. Lightwave Technol. 17(10), 1782–1792 (1999). [CrossRef]

OCIS Codes
(060.0060) Fiber optics and optical communications : Fiber optics and optical communications
(060.2360) Fiber optics and optical communications : Fiber optics links and subsystems
(060.2605) Fiber optics and optical communications : Free-space optical communication

ToC Category:
Fiber Optics and Optical Communications

History
Original Manuscript: July 5, 2013
Revised Manuscript: September 18, 2013
Manuscript Accepted: September 20, 2013
Published: September 27, 2013

Citation
Chia-Yi Chen, Hai-Han Lu, Ying-Pyng Lin, Po-Yi Wu, Kuan-Hung Wu, and Wei-Yuan Yaug, "Full-duplex lightwave transport systems based on long-haul SMF and optical free-space transmissions," Opt. Express 21, 23655-23661 (2013)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-21-20-23655


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References

  1. C. Y. Li, H. S. Su, C. H. Chang, H. H. Lu, P. Y. Wu, C. Y. Chen, and C. L. Ying, “Generation and transmission of BB/MW/MMW signals by cascading PM and MZM,” J. Lightwave Technol.30(3), 298–303 (2012). [CrossRef]
  2. C. Y. Li, H. S. Su, C. Y. Chen, H. H. Lu, H. W. Chen, C. H. Chang, and C. H. Jiang, “Full-duplex lightwave transport systems employing phase-modulated RoF and intensity-remodulated CATV signals,” Opt. Express19(15), 14000–14007 (2011). [CrossRef] [PubMed]
  3. 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. Express21(1), 1203–1208 (2013). [CrossRef] [PubMed]
  4. 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. Express20(15), 16218–16223 (2012). [CrossRef]
  5. C. W. Chow and Y. H. Lin, “Convergent optical wired and wireless long-reach access network using high spectral-efficient modulation,” Opt. Express20(8), 9243–9248 (2012). [CrossRef] [PubMed]
  6. 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,” In Proc. Opt. Fiber Commun. (OFC), JWA83 (2011).
  7. 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,” In Proc. Opt. Fiber Commun. (OFC), OTh1G4 (2013).
  8. C. W. Chow, C. H. Yeh, Y. F. Liu, and Y. Liu, “Improved modulation speed of LED visible light communication system integrated to the main electricity network,” Electron. Lett.47(15), 867–868 (2011). [CrossRef]
  9. 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. Express20(9), 9919–9924 (2012). [CrossRef] [PubMed]
  10. F. Alsaadi and J. Elmirghani, “Performance evaluation of 2.5 Gbit/s and 5 Gbit/s optical wireless systems employing a two dimensional adaptive beam clustering method and imaging diversity detection,” IEEE J. Sel. Areas Comm.27(8), 1507–1519 (2009). [CrossRef]
  11. J. Fadlullah and M. Kavehrad, “Indoor high-bandwidth optical wireless links for sensor networks,” J. Lightwave Technol.28(21), 3086–3094 (2010).
  12. D. C. O'Brien, “Visible light communications: challenges and potential,” In Proc. IEEE Photon. Conf., 365–366 (2011).
  13. K. Wang, A. Nirmalathas, C. Lim, and E. Skafidas, “High-speed optical wireless communication system for indoor applications,” IEEE Photon. Technol. Lett.23(8), 519–521 (2011). [CrossRef]
  14. H. H. Lu, S. J. Tzeng, and Y. L. Liu, “Intermodulation distortion suppression in a full-duplex radio-on-fiber ring network,” IEEE Photon. Technol. Lett.16(2), 602–604 (2004). [CrossRef]
  15. M. R. Phillips and D. M. Ott, “Crosstalk caused by nonideal output filters in WDM lightwave systems,” IEEE Photon. Technol. Lett.12(8), 1094–1096 (2000). [CrossRef]
  16. M. R. Phillips and D. M. Ott, “Crosstalk due to optical fiber nonliearities in WDM CATV lightwave systems,” J. Lightwave Technol.17(10), 1782–1792 (1999). [CrossRef]

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