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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 6 — Mar. 12, 2012
  • pp: 6230–6235
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Experimental demonstration of novel source-free ONUs in bidirectional RF up-converted optical OFDM-PON utilizing polarization multiplexing

Chongfu Zhang, Chen Chen, Yuan Feng, and Kun Qiu  »View Author Affiliations


Optics Express, Vol. 20, Issue 6, pp. 6230-6235 (2012)
http://dx.doi.org/10.1364/OE.20.006230


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Abstract

We propose and experimentally demonstrate a novel cost-effective optical orthogonal frequency-division multiplexing-based passive optical network (OFDM-PON) system, wherein all optical network units (ONUs) are source-free not only in the optical domain but also in the electric domain, by utilizing polarization multiplexing (PolMUX) in the downlink transmission. Two pure optical bands with a frequency interval of 10 GHz and downlink up-converted 10 GHz OFDM signal are carried in two orthogonal states of polarization (SOPs), respectively. 10 GHz radio frequency (RF) source can be generated by a heterodyne of two pure optical bands after polarization beam splitting in each ONU, therefore it can be used to down-convert the downlink OFDM signal and up-convert the uplink OFDM signal. In the whole bidirectional up-converted OFDM-PON system, only one single RF source is employed in the optical line terminal (OLT). Experimental results successfully verify the feasibility of our proposed cost-effective optical OFDM-PON system.

© 2012 OSA

1. Introduction

Passive optical networks (PONs) have being triggering tremendous interest for being considered as an economic and future-proof strategy to meet the rising demand of bandwidth-hungry multi-media applications in multi-user access networks. Optical orthogonal frequency-division multiplexing (OFDM) is a promising multi-user access technology due to its high spectrum efficiency and robustness to chromatic dispersion and it has been extensively used in PON systems [1

1. N. Cvijetic, D. Qian, J. Hu, and T. Wang, “Orthogonal frequency division multiple access PON (OFDMA-PON) for colorless upstream transmission beyond 10 Gb/s,” IEEE J. Sel. Areas Commun. 28(6), 781–790 (2010). [CrossRef]

3

3. C. Zhang, C. Chen, J. Huang, and K. Qiu, “Performance improvement of optical OFDMA-based PON using data clipping and additional phases,” IEEE Photon. Technol. Lett. 24(4), 255–257 (2012). [CrossRef]

]. In a typical direct-detect OFDM-PON system, radio frequency (RF) upconversion is a necessary process and it creates a frequency guardband between the DC component and the OFDM sideband, thus preventing the transmitted signal from significant deterioration by non-coherent mixing products [4

4. B. Schmidt, A. Lowery, and J. Armstrong, “Experimental demonstrations of electronic dispersion compensation for long-haul transmission using direct-detection optical OFDM,” J. Lightwave Technol. 26(1), 196–203 (2008). [CrossRef]

].

Since cost-effectiveness is one of the most attractive advantages of the PON system, many investigations have been done about reducing the cost of OFDM-PON system, such as signal remodulation technique using electroabsorption modulator (EAM), reflective semiconductor optical amplifier (RSOA) or injection-locked Fabry–Pérot laser diode (FP-LD) [5

5. C. Chow, C. Yeh, C. Wang, F. Shih, and S. Chi, “Signal remodulation of OFDM-QAM for long reach carrier distributed passive optical networks,” IEEE Photon. Technol. Lett. 21(11), 715–717 (2009). [CrossRef]

7

7. J. Yu, M. Huang, D. Qian, L. Chen, and G. Chang, “Centralized lightwave WDM-PON employing 16-QAM intensity modulated OFDM downstream and OOK modulated upstream signals,” IEEE Photon. Technol. Lett. 20(18), 1545–1547 (2008). [CrossRef]

] and ONU-side optical source delivering technique [1

1. N. Cvijetic, D. Qian, J. Hu, and T. Wang, “Orthogonal frequency division multiple access PON (OFDMA-PON) for colorless upstream transmission beyond 10 Gb/s,” IEEE J. Sel. Areas Commun. 28(6), 781–790 (2010). [CrossRef]

, 8

8. C. W. Chow, C. H. Yeh, Y. F. Wu, H. Y. Chen, Y. H. Lin, J. Y. Sung, Y. Liu, and C. L. Pan, “13Gbit/s WDM-OFDM PON using RSOA-based colourless ONU with seeding light source in local exchange,” Electron. Lett. 45, 1235–1236 (2011).

]. These techniques are mainly aimed to make each ONU free of optical source in the optical domain, while RF source or a broadband ADC/DAC is needed for each ONU in a typical up-converted OFDM-PON system and it inevitably aggrandizes the ONU-side cost for the commercial RF source is quite expensive, let alone the broadband ADC/DAC. Ref [9

9. N. Cvijetic, M. F. Huang, E. Ip, Y. Shao, Y. K. Huang, M. Cvijetic, and T. Wang, “1.92 Tb/s coherent DWDM-OFDMA-PON with no high-speed ONU-side electronics over 100 km SSMF and 1:64 passive split,” Opt. Express 19(24), 24540–24545 (2011). [CrossRef] [PubMed]

]. has proposed that coherent ONU-side detection with low-speed ADCs/DACs/DSP and off-the-shelf RF components can address the optical signal to noise ratio (OSNR) and high-speed electronics challenges, but this approach is still relatively complicated and expensive. To the best of our knowledge, no research focusing on reducing the RF source cost in each ONU using polarization multiplexing (PolMUX) has ever been reported and it is worth further study. As an effective solution to further increase spectrum efficiency, PolMUX has been widely employed in the transmission of high-speed and large-capacity OFDM signals [10

10. D. Qian, N. Cvijetic, J. Hu, and T. Wang, “108 Gb/s OFDMA-PON with polarization multiplexing and direct detection,” J. Lightwave Technol. 28(4), 484–493 (2010). [CrossRef]

12

12. S. L. Jansen, I. Morita, T. C. W. Schenk, and H. Tanaka, “121.9-Gb/s PDM-OFDM transmission with 2-b/s/Hz spectral efficiency over 1000 km of SSMF,” J. Lightwave Technol. 27(3), 177–188 (2009). [CrossRef]

]. Consequently, applying PolMUX to the up-converted OFDM-PON system offers the possibility to lower the cost of RF source in each ONU, and it results in novel source-free ONUs both in the optical and the electric domain, thus with enhanced cost-efficiency and off-the-shelf polarization components it can provide the implementation of an extremely cost-effective optical OFDM-PON system.

2. Principle of the proposed optical OFDM-PON system

3. Experimental setup, results and discussion

Figure 3
Fig. 3 Experimental setup of the proposed optical OFDM-PON system.
illustrates the detailed experimental setup of our proposed bidirectional up-converted OFDM-PON system. In the OLT, a narrow-linewidth distributed feedback (DFB) laser at λ1 = 1549.60 nm with 80 kHz linewidth and 10 dBm launch power is employed as the DS CW optical source and it is split into two streams and each enters into an IM after passing a PC. A 10 Gb/s baseband 16 QAM-OFDM signal is generated off-line with the FFT size N = 128, 7% forward error correction (FEC) overhead, 6% training sequence overhead and 3.125% CP overhead. The baseband OFDM signal is firstly uploaded into a Tektronix arbitrary waveform generator (AWG7102) at 10 Gsample/s with 8 bits resolution, and then it is up-converted to 10 GHz RF using an analog IQ-mixer and a 10 GHz RF source. The 10 GHz RF-OFDM signal is modulated onto one of the CW laser stream via an IM and a SSB signal is generated after the modulated signal passing an optical interleaver as the band-pass OF with the central wavelength of 1549.64 nm and the bandwidth of 10 GHz as shown in Fig. 4
Fig. 4 The corresponding spectra of the proposed optical OFDM-PON system in Fig. 3.
(1). Another CW laser stream is modulated by the pure 10 GHz RF source and a pure SSB signal is generated after the modulated signal passing another band-pass OF with the central wavelength of 1549.56 nm and the bandwidth of 10 GHz as shown in Fig. 4(2). A PBC is adopted to combine the two generated SSB signals and place them on two orthogonal SOPs as depicted in Fig. 4(3). After coupled with another narrow-linewidth DFB laser at λ2 = 1549.76 nm with 80 kHz linewidth and 10 dBm launch power, the DS signal is finally formed as given in Fig. 4(4) and it is transmitted through 20 km SSMF and a variable optical attenuator (VOA) at 12 dB after a circulator.

4. Conclusion

Acknowledgment

This work is jointly supported by NSFC No. 61171045, and JX0801. The authors would like to thank Dr. F. Wen, Prof. B. J. Wu, Dr. Z. N. Wang for their help, and anonymous reviewers for their valuable comments that improve the clarity and quality of this paper.

References and links

1.

N. Cvijetic, D. Qian, J. Hu, and T. Wang, “Orthogonal frequency division multiple access PON (OFDMA-PON) for colorless upstream transmission beyond 10 Gb/s,” IEEE J. Sel. Areas Commun. 28(6), 781–790 (2010). [CrossRef]

2.

C. Zhang, J. Huang, C. Chen, and K. Qiu, “All-optical virtual private network and ONUs communication in optical OFDM-based PON system,” Opt. Express 19(24), 24816–24821 (2011). [CrossRef] [PubMed]

3.

C. Zhang, C. Chen, J. Huang, and K. Qiu, “Performance improvement of optical OFDMA-based PON using data clipping and additional phases,” IEEE Photon. Technol. Lett. 24(4), 255–257 (2012). [CrossRef]

4.

B. Schmidt, A. Lowery, and J. Armstrong, “Experimental demonstrations of electronic dispersion compensation for long-haul transmission using direct-detection optical OFDM,” J. Lightwave Technol. 26(1), 196–203 (2008). [CrossRef]

5.

C. Chow, C. Yeh, C. Wang, F. Shih, and S. Chi, “Signal remodulation of OFDM-QAM for long reach carrier distributed passive optical networks,” IEEE Photon. Technol. Lett. 21(11), 715–717 (2009). [CrossRef]

6.

J. L. Wei, E. Hugues-Salas, R. P. Giddings, X. Q. Jin, X. Zheng, S. Mansoor, and J. M. Tang, “Wavelength reused bidirectional transmission of adaptively modulated optical OFDM signals in WDM-PONs incorporating SOA and RSOA intensity modulators,” Opt. Express 18(10), 9791–9808 (2010). [CrossRef] [PubMed]

7.

J. Yu, M. Huang, D. Qian, L. Chen, and G. Chang, “Centralized lightwave WDM-PON employing 16-QAM intensity modulated OFDM downstream and OOK modulated upstream signals,” IEEE Photon. Technol. Lett. 20(18), 1545–1547 (2008). [CrossRef]

8.

C. W. Chow, C. H. Yeh, Y. F. Wu, H. Y. Chen, Y. H. Lin, J. Y. Sung, Y. Liu, and C. L. Pan, “13Gbit/s WDM-OFDM PON using RSOA-based colourless ONU with seeding light source in local exchange,” Electron. Lett. 45, 1235–1236 (2011).

9.

N. Cvijetic, M. F. Huang, E. Ip, Y. Shao, Y. K. Huang, M. Cvijetic, and T. Wang, “1.92 Tb/s coherent DWDM-OFDMA-PON with no high-speed ONU-side electronics over 100 km SSMF and 1:64 passive split,” Opt. Express 19(24), 24540–24545 (2011). [CrossRef] [PubMed]

10.

D. Qian, N. Cvijetic, J. Hu, and T. Wang, “108 Gb/s OFDMA-PON with polarization multiplexing and direct detection,” J. Lightwave Technol. 28(4), 484–493 (2010). [CrossRef]

11.

A. Li, A. Al Amin, X. Chen, and W. Shieh, “Transmission of 107-Gb/s mode and polarization multiplexed CO-OFDM signal over a two-mode fiber,” Opt. Express 19(9), 8808–8814 (2011). [CrossRef] [PubMed]

12.

S. L. Jansen, I. Morita, T. C. W. Schenk, and H. Tanaka, “121.9-Gb/s PDM-OFDM transmission with 2-b/s/Hz spectral efficiency over 1000 km of SSMF,” J. Lightwave Technol. 27(3), 177–188 (2009). [CrossRef]

13.

C. Chow, C. Yeh, C. Wang, F. Shih, and S. Chi, “Rayleigh backs-cattering performance of OFDM-QAM in carrier distributed passive optical networks,” IEEE Photon. Technol. Lett. 20(22), 1848–1850 (2008). [CrossRef]

OCIS Codes
(060.2330) Fiber optics and optical communications : Fiber optics communications
(060.2360) Fiber optics and optical communications : Fiber optics links and subsystems
(060.4230) Fiber optics and optical communications : Multiplexing
(200.4740) Optics in computing : Optical processing

ToC Category:
Fiber Optics and Optical Communications

History
Original Manuscript: January 5, 2012
Revised Manuscript: February 17, 2012
Manuscript Accepted: February 28, 2012
Published: March 2, 2012

Citation
Chongfu Zhang, Chen Chen, Yuan Feng, and Kun Qiu, "Experimental demonstration of novel source-free ONUs in bidirectional RF up-converted optical OFDM-PON utilizing polarization multiplexing," Opt. Express 20, 6230-6235 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-6-6230


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References

  1. N. Cvijetic, D. Qian, J. Hu, and T. Wang, “Orthogonal frequency division multiple access PON (OFDMA-PON) for colorless upstream transmission beyond 10 Gb/s,” IEEE J. Sel. Areas Commun.28(6), 781–790 (2010). [CrossRef]
  2. C. Zhang, J. Huang, C. Chen, and K. Qiu, “All-optical virtual private network and ONUs communication in optical OFDM-based PON system,” Opt. Express19(24), 24816–24821 (2011). [CrossRef] [PubMed]
  3. C. Zhang, C. Chen, J. Huang, and K. Qiu, “Performance improvement of optical OFDMA-based PON using data clipping and additional phases,” IEEE Photon. Technol. Lett.24(4), 255–257 (2012). [CrossRef]
  4. B. Schmidt, A. Lowery, and J. Armstrong, “Experimental demonstrations of electronic dispersion compensation for long-haul transmission using direct-detection optical OFDM,” J. Lightwave Technol.26(1), 196–203 (2008). [CrossRef]
  5. C. Chow, C. Yeh, C. Wang, F. Shih, and S. Chi, “Signal remodulation of OFDM-QAM for long reach carrier distributed passive optical networks,” IEEE Photon. Technol. Lett.21(11), 715–717 (2009). [CrossRef]
  6. J. L. Wei, E. Hugues-Salas, R. P. Giddings, X. Q. Jin, X. Zheng, S. Mansoor, and J. M. Tang, “Wavelength reused bidirectional transmission of adaptively modulated optical OFDM signals in WDM-PONs incorporating SOA and RSOA intensity modulators,” Opt. Express18(10), 9791–9808 (2010). [CrossRef] [PubMed]
  7. J. Yu, M. Huang, D. Qian, L. Chen, and G. Chang, “Centralized lightwave WDM-PON employing 16-QAM intensity modulated OFDM downstream and OOK modulated upstream signals,” IEEE Photon. Technol. Lett.20(18), 1545–1547 (2008). [CrossRef]
  8. C. W. Chow, C. H. Yeh, Y. F. Wu, H. Y. Chen, Y. H. Lin, J. Y. Sung, Y. Liu, and C. L. Pan, “13Gbit/s WDM-OFDM PON using RSOA-based colourless ONU with seeding light source in local exchange,” Electron. Lett.45, 1235–1236 (2011).
  9. N. Cvijetic, M. F. Huang, E. Ip, Y. Shao, Y. K. Huang, M. Cvijetic, and T. Wang, “1.92 Tb/s coherent DWDM-OFDMA-PON with no high-speed ONU-side electronics over 100 km SSMF and 1:64 passive split,” Opt. Express19(24), 24540–24545 (2011). [CrossRef] [PubMed]
  10. D. Qian, N. Cvijetic, J. Hu, and T. Wang, “108 Gb/s OFDMA-PON with polarization multiplexing and direct detection,” J. Lightwave Technol.28(4), 484–493 (2010). [CrossRef]
  11. A. Li, A. Al Amin, X. Chen, and W. Shieh, “Transmission of 107-Gb/s mode and polarization multiplexed CO-OFDM signal over a two-mode fiber,” Opt. Express19(9), 8808–8814 (2011). [CrossRef] [PubMed]
  12. S. L. Jansen, I. Morita, T. C. W. Schenk, and H. Tanaka, “121.9-Gb/s PDM-OFDM transmission with 2-b/s/Hz spectral efficiency over 1000 km of SSMF,” J. Lightwave Technol.27(3), 177–188 (2009). [CrossRef]
  13. C. Chow, C. Yeh, C. Wang, F. Shih, and S. Chi, “Rayleigh backs-cattering performance of OFDM-QAM in carrier distributed passive optical networks,” IEEE Photon. Technol. Lett.20(22), 1848–1850 (2008). [CrossRef]

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