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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 12 — Jun. 6, 2011
  • pp: 11100–11105
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Ultra-dense WDM-PON delivering carrier-centralized Nyquist-WDM uplink with digital coherent detection

Ze Dong, Jianjun Yu, Hung-Chang Chien, Nan Chi, Lin Chen, and Gee-Kung Chang  »View Author Affiliations


Optics Express, Vol. 19, Issue 12, pp. 11100-11105 (2011)
http://dx.doi.org/10.1364/OE.19.011100


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Abstract

We introduce an “ultra-dense” concept into next-generation WDM-PON systems, which transmits a Nyquist-WDM uplink with centralized uplink optical carriers and digital coherent detection for the future access network requiring both high capacity and high spectral efficiency. 80-km standard single mode fiber (SSMF) transmission of Nyquist-WDM signal with 13 coherent 25-GHz spaced wavelength shaped optical carriers individually carrying 100-Gbit/s polarization-multiplexing quadrature phase-shift keying (PM-QPSK) upstream data has been experimentally demonstrated with negligible transmission penalty. The 13 frequency-locked wavelengths with a uniform optical power level of −10 dBm and OSNR of more than 50 dB are generated from a single lightwave via a multi-carrier generator consists of an optical phase modulator (PM), a Mach-Zehnder modulator (MZM), and a WSS. Following spacing the carriers at the baud rate, sub-carriers are individually spectral shaped to form Nyquist-WDM. The Nyquist-WDM channels have less than 1-dB crosstalk penalty of optical signal-to-noise ratio (OSNR) at 2 × 10−3 bit-error rate (BER). Performance of a traditional coherent optical OFDM scheme and its restrictions on symbol synchronization and power difference are also experimentally compared and studied.

© 2011 OSA

1. Introduction

2. Operating principles of ultra-dense WDM-PONs

3. System setup

3.1 Experimental setup

3.2 Digital signal processing

The captured data is processed through offline DSP. Firstly, the clock is extracted by using “square and filter” method, the digital signal is re-sampled at twice of the baud rate based on the recovery clock. Secondly, a T/2-spaced time-domain finite impulse response (FIR) filter is utilized for the compensation of chromatic dispersion, where the filter coefficients is calculated from known fiber CD transfer function using frequency-domain truncation method [16

16. S. J. Savory, “Digital filters for coherent optical receivers,” Opt. Express 16(2), 804–817 (2008). [CrossRef] [PubMed]

]. Thirdly, two complex-valued, 13-tap, T/2-spaced adaptive FIR filters, found on classic constant modulus algorithm (CMA), is used to retrieve the modulus of the QPSK signal [16

16. S. J. Savory, “Digital filters for coherent optical receivers,” Opt. Express 16(2), 804–817 (2008). [CrossRef] [PubMed]

]; The carrier recovery is performed in the subsequent step where the 4-th power is used to estimate the frequency offset between the LO and the received optical signal, the frequency offset is obtained from the speed of the phase rotation of Mth-power of the signal after CMA process, and then the MLSE algorithm is utilized to estimate the carrier phase [6

6. X. Zhou and J. Yu, “Multi-level, multi-dimensional coding for high-speed and high-spectral-efficiency optical transmission,” J. Lightwave Technol. 27(16), 3641–3653 (2009). [CrossRef]

,17

17. A. J. Viterbi and A. M. Viterbi, “Nonlinear estimation of PSK-modulated carrier phase with application to burst digital transmission,” IEEE Trans. Inf. Theory 29(4), 543–551 (1983). [CrossRef]

].

4. Experimental results

We also experimentally confirmed that traditional CO-OFDM is restricted by symbol transition-aligning and relative power match with all subcarrier. Figure 5(b) shows the BER performance of CO-OFDM versus power level for even and odd subcarriers. It can be found that BER performance will be worse off shapely when the orthogonal relationship is just broken down by 2.5-dB power difference.

5. Conclusion and discussion

References and links

1.

M. F. Huang, J. Yu, J. Chen, G.-K. Chang, and S. Chi, ” A cost-effective WDM-PON configuration employing innovative bi-directional amplification,” in Optical Fiber Communication Conference and Exposition and The National Fiber Optic Engineers Conference, OSA Technical Digest Series (CD) (Optical Society of America, 2007), paper OWL3.

2.

Z. Xu, Y. J. Wen, M. Attygalle, X. Cheng, W.-D. Zhong, Y. Wang, and C. Lu, “Multiple channel carrier-reused WDM passive optical networks,” presented at European Conference on Optical Communications, 2006, Cannes, France (Sept. 24–28, 2006), paper PDP: Th. 4.3.2.

3.

C. C. K. Chan, L. K. Chen, and C. Lin, “Novel network architectures for survivable WDM passive optical networks,” presented at 34th European Conference on Optical Communication, 2008. ECOC 2008, Brussels, Belgium (Sept. 21–25, 2008), paper. Th.1.F.6 (2008).

4.

M. Presi, R. Proietti, K. Prince, G. Contestabile, and E. Ciaramella, “A 80 km reach fully passive WDM-PON based on reflective ONUs,” Opt. Express 16(23), 19043–19048 (2008). [CrossRef]

5.

A. Zapata and M. DüJ. ser, P. Spencer, and I. Bayval deD. Miguel, N. Breuer, and Hanik, andA. Gladisch, “Next-generation 100-gigabit metro ethernet (100 GbME) using multi-wavelength optical rings,” J. Lightwave Technol. 22(11), 2420–2434 (2004). [CrossRef]

6.

X. Zhou and J. Yu, “Multi-level, multi-dimensional coding for high-speed and high-spectral-efficiency optical transmission,” J. Lightwave Technol. 27(16), 3641–3653 (2009). [CrossRef]

7.

J. Yu, X. Zhou, L. Xu, P. Ji, and T. Wang, “A novel scheme to generate 100Gbit/s DQPSK signal with large PMD tolerance,” in National Fiber Optic Engineers Conference, OSA Technical Digest Series (CD) (Optical Society of America, 2007), paper JThA42.

8.

W. Shieh, Q. Yang, and Y. Ma, “107 Gb/s coherent optical OFDM transmission over 1000-km SSMF fiber using orthogonal band multiplexing,” Opt. Express 16(9), 6378–6386 (2008). [CrossRef] [PubMed]

9.

K. Lee, C. T. D. Thai, and J.-K. K. Rhee, “All optical discrete Fourier transform processor for 100 Gbps OFDM transmission,” Opt. Express 16(6), 4023–4028 (2008). [CrossRef] [PubMed]

10.

T. Kobayashi, A. Sano, E. Yamada, Y. Miyamoto, H. Takara, and A. Takada, “Electro-optically multiplexed 110 Git/s optical OFDM signal transmission over 80km SMF without dispersion compensation,” Electron. Lett. 44(3), 225–226 (2008). [CrossRef]

11.

S. Chandrasekhar and X. Liu, “Experimental investigation on the performance of closely spaced multi-carrier PDM-QPSK with digital coherent detection,” Opt. Express 17(24), 21350–21361 (2009). [CrossRef] [PubMed]

12.

J. Yu, “1.2 Tbit/s orthogonal PDM-RZ-QPSK DWDM signal transmission over 1040 km SMF-28,” Electron. Lett. 46(11), 775–777 (2010). [CrossRef]

13.

A. Sano, E. Yamada, H. Masuda, E. Yamazaki, T. Kobayashi, E. Yoshida, Y. Miyamoto, R. Kudo, K. Ishihara, and Y. Takatori, “No-guard-interval coherent optical OFDM for 100-Gb/s long-haul WDM transmission,” J. Lightwave Technol. 27(16), 3705–3713 (2009). [CrossRef]

14.

G. Bosco, A. Carena, V. Curri, P. Poggiolini, and F. Forghieri, “Performance limit of Nyquist-WDM and CO-OFDM in high-speed PM-QPSK system,” IEEE Photon. Technol. Lett. 22(15), 1129–1131 (2010). [CrossRef]

15.

E. Torrengo, R. Cigliutti, G. Bosco, G. Gavioli, A. Alaimo, A. Carena, V. Curri, F. Forghieri, S. Piciaccia, M. Elmonte, A. Brinciotti, A. La Porta, and P. Poggiolini, “Transoceanic PM-QPSK terabit superchannel transmission experiments at baud-rate subcarrier spacing,” presented at 2010 36th European Conference and Exhibition on Optical Communication (ECOC), Torino, Italy (Sept. 19–23, 2010), paper We.7.C.2.

16.

S. J. Savory, “Digital filters for coherent optical receivers,” Opt. Express 16(2), 804–817 (2008). [CrossRef] [PubMed]

17.

A. J. Viterbi and A. M. Viterbi, “Nonlinear estimation of PSK-modulated carrier phase with application to burst digital transmission,” IEEE Trans. Inf. Theory 29(4), 543–551 (1983). [CrossRef]

OCIS Codes
(060.1660) Fiber optics and optical communications : Coherent communications
(060.4510) Fiber optics and optical communications : Optical communications
(060.4264) Fiber optics and optical communications : Networks, wavelength assignment

ToC Category:
Fiber Optics and Optical Communications

History
Original Manuscript: March 22, 2011
Revised Manuscript: May 17, 2011
Manuscript Accepted: May 17, 2011
Published: May 23, 2011

Citation
Ze Dong, Jianjun Yu, Hung-Chang Chien, Nan Chi, Lin Chen, and Gee-Kung Chang, "Ultra-dense WDM-PON delivering carrier-centralized Nyquist-WDM uplink with digital coherent detection," Opt. Express 19, 11100-11105 (2011)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-19-12-11100


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References

  1. M. F. Huang, J. Yu, J. Chen, G.-K. Chang, and S. Chi, ” A cost-effective WDM-PON configuration employing innovative bi-directional amplification,” in Optical Fiber Communication Conference and Exposition and The National Fiber Optic Engineers Conference, OSA Technical Digest Series (CD) (Optical Society of America, 2007), paper OWL3.
  2. Z. Xu, Y. J. Wen, M. Attygalle, X. Cheng, W.-D. Zhong, Y. Wang, and C. Lu, “Multiple channel carrier-reused WDM passive optical networks,” presented at European Conference on Optical Communications, 2006, Cannes, France (Sept. 24–28, 2006), paper PDP: Th. 4.3.2.
  3. C. C. K. Chan, L. K. Chen, and C. Lin, “Novel network architectures for survivable WDM passive optical networks,” presented at 34th European Conference on Optical Communication, 2008. ECOC 2008, Brussels, Belgium (Sept. 21–25, 2008), paper. Th.1.F.6 (2008).
  4. M. Presi, R. Proietti, K. Prince, G. Contestabile, and E. Ciaramella, “A 80 km reach fully passive WDM-PON based on reflective ONUs,” Opt. Express 16(23), 19043–19048 (2008). [CrossRef]
  5. A. Zapata and M. DüJ. ser, P. Spencer, and I. Bayval deD. Miguel, N. Breuer, and Hanik, andA. Gladisch, “Next-generation 100-gigabit metro ethernet (100 GbME) using multi-wavelength optical rings,” J. Lightwave Technol. 22(11), 2420–2434 (2004). [CrossRef]
  6. X. Zhou and J. Yu, “Multi-level, multi-dimensional coding for high-speed and high-spectral-efficiency optical transmission,” J. Lightwave Technol. 27(16), 3641–3653 (2009). [CrossRef]
  7. J. Yu, X. Zhou, L. Xu, P. Ji, and T. Wang, “A novel scheme to generate 100Gbit/s DQPSK signal with large PMD tolerance,” in National Fiber Optic Engineers Conference, OSA Technical Digest Series (CD) (Optical Society of America, 2007), paper JThA42.
  8. W. Shieh, Q. Yang, and Y. Ma, “107 Gb/s coherent optical OFDM transmission over 1000-km SSMF fiber using orthogonal band multiplexing,” Opt. Express 16(9), 6378–6386 (2008). [CrossRef] [PubMed]
  9. K. Lee, C. T. D. Thai, and J.-K. K. Rhee, “All optical discrete Fourier transform processor for 100 Gbps OFDM transmission,” Opt. Express 16(6), 4023–4028 (2008). [CrossRef] [PubMed]
  10. T. Kobayashi, A. Sano, E. Yamada, Y. Miyamoto, H. Takara, and A. Takada, “Electro-optically multiplexed 110 Git/s optical OFDM signal transmission over 80km SMF without dispersion compensation,” Electron. Lett. 44(3), 225–226 (2008). [CrossRef]
  11. S. Chandrasekhar and X. Liu, “Experimental investigation on the performance of closely spaced multi-carrier PDM-QPSK with digital coherent detection,” Opt. Express 17(24), 21350–21361 (2009). [CrossRef] [PubMed]
  12. J. Yu, “1.2 Tbit/s orthogonal PDM-RZ-QPSK DWDM signal transmission over 1040 km SMF-28,” Electron. Lett. 46(11), 775–777 (2010). [CrossRef]
  13. A. Sano, E. Yamada, H. Masuda, E. Yamazaki, T. Kobayashi, E. Yoshida, Y. Miyamoto, R. Kudo, K. Ishihara, and Y. Takatori, “No-guard-interval coherent optical OFDM for 100-Gb/s long-haul WDM transmission,” J. Lightwave Technol. 27(16), 3705–3713 (2009). [CrossRef]
  14. G. Bosco, A. Carena, V. Curri, P. Poggiolini, and F. Forghieri, “Performance limit of Nyquist-WDM and CO-OFDM in high-speed PM-QPSK system,” IEEE Photon. Technol. Lett. 22(15), 1129–1131 (2010). [CrossRef]
  15. E. Torrengo, R. Cigliutti, G. Bosco, G. Gavioli, A. Alaimo, A. Carena, V. Curri, F. Forghieri, S. Piciaccia, M. Elmonte, A. Brinciotti, A. La Porta, and P. Poggiolini, “Transoceanic PM-QPSK terabit superchannel transmission experiments at baud-rate subcarrier spacing,” presented at 2010 36th European Conference and Exhibition on Optical Communication (ECOC), Torino, Italy (Sept. 19–23, 2010), paper We.7.C.2.
  16. S. J. Savory, “Digital filters for coherent optical receivers,” Opt. Express 16(2), 804–817 (2008). [CrossRef] [PubMed]
  17. A. J. Viterbi and A. M. Viterbi, “Nonlinear estimation of PSK-modulated carrier phase with application to burst digital transmission,” IEEE Trans. Inf. Theory 29(4), 543–551 (1983). [CrossRef]

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