Abstract

In this paper, we discuss the realization of wavelength-division multiplexing (WDM) transmission at high spectral efficiency. For this experiment, coherent polarization-division multiplexing--orthogonal frequency-division multiplexing (PDM-OFDM) is used as a modulation format. PDM-OFDM uses training symbols for channel estimation. This makes OFDM easily scalable to higher level modulation formats as channel estimation is realized with training symbols that are independent of the constellation size. Furthermore, because of its well-defined spectrum OFDM requires only a small guard band between WDM channels. The dependence of the number of OFDM subcarriers is investigated with respect to the interchannel linear crosstalk. At a constant data rate the number of OFDM subcarriers is estimated to achieve lower linear crosstalk in order to achieve higher spectral efficiency. We then experimentally demonstrate dense WDM (DWDM) transmission with 7.0-b/s/Hz net spectral efficiency using 8$\,\times\,$65.1-Gb/s coherent PDM-OFDM signals with 8-GHz WDM channel spacing utilizing 32-quadrature-amplitude-modulation subcarrier modulation. Successful transmission is achieved over 240 km standard single-mode fiber (SSMF) spans with hybrid erbium-doped fiber amplifiers/Raman amplification.

© 2010 IEEE

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  1. M. Nakazawa, "Challenges to FDM-QAM coherent transmission with ultrahigh spectral efficiency," Eur. Conf. Opt. Commun. BrusselsBelgium (2008) Paper Tu.1.E.1.
  2. A. H. Gnauck, P. J. Winzer, C. R. Doerr, L. L. Buhl, "10$\,\times\,$112—Gb/s PDM 16–QAM transmission over 630 km of fiber with 6.2-b/s/Hz spectral efficiency," Opt. Fiber Commun. Conf. San DiegoCA (2009) Paper PDPB8.
  3. H. Takahashi, A. A. Amin, S. L. Jansen, I. Morita, H. Tanaka, "8$\,\times\,$66.8-Gbit/s coherent PDM-OFDM transmission over 640 km of SSMF at 5.6-bit/s/Hz spectral efficiency," Eur. Conf. Opt. Commun. BrusselsBelgium (2008) Post-deadline Paper Th.3.E.4.
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  6. A. Sano, E. Yamada, H. Masuda, E. Yamazaki, T. Kobayashi, E. Yoshida, Y. Miyamoto, S. Matsuoka, R. Kudo, K. Ishihara, Y. Takatori, M. Mizoguchi, K. Okada, K. Hagimoto, H. Yamazaki, S. Kamei, H. Ishii, "13.4-Tb/s (134$\,\times\,$111-Gb/s/ch) No-guard-interval coherent OFDM transmission over 3 600 km of SMF with 19-ps average PMD," Eur. Conf. Opt. Commun. BrusselsBelgium (2008) Post-deadline paper Th.3.E.1.
  7. Q. Yang, Y. Ma, W. Shieh, "107 Gb/s coherent optical OFDM reception using orthogonal band multiplexing," Opt. Fiber Commun. Conf. San DiegoCA (2008) Paper PDP 7.
  8. S. L. Jansen, I. Morita, T. C. W. Schenk, N. Takeda, H. Tanaka, "Coherent optical 25.8-Gb/s OFDM transmission over 4160-km SSMF," J. Lightw. Technol. 26, 6-15 (2008).
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2008 (4)

S. L. Jansen, I. Morita, T. C. W. Schenk, N. Takeda, H. Tanaka, "Coherent optical 25.8-Gb/s OFDM transmission over 4160-km SSMF," J. Lightw. Technol. 26, 6-15 (2008).

S. L. Jansen, I. Morita, T. C. W. Schenk, H. Tanaka, "Long-haul transmission of 16$\,\times\,$52.5 Gbits/s polarization-division-multiplexed OFDM enabled by MIMO processing," J. Opt. Network. 7, 173-182 (2008).

Q. Yang, 1, W. Shieh, Y. Ma1, "Guard-band influence on orthogonal-band multiplexed coherent optical OFDM," Opt. Lett. 33, 2239-2241 (2008).

X. Yi, W. Shieh, Y. Ma, "Phase noise effects on high spectral efficiency coherent optical OFDM transmission," J. Lightw. Technol. 26, 1309-1316 (2008).

2007 (1)

W. Shieh, X. Yi, Y. Tang, "Transmission experiment of multi-gigabit coherent optical OFDM systems over 1000 km SSMF fibre," Electron. Lett. 43, 183-184 (2007).

2006 (1)

M. Brodsky, "Polarization mode dispersion of installed fibers," J. Lightw. Technol. 24, 4584-4599 (2006).

1998 (1)

X. Li, L. J. Cimini, "Effects of clipping and filtering on the performance of OFDM," IEEE Commun. Lett. 2, 131-133 (1998).

Electron. Lett. (1)

W. Shieh, X. Yi, Y. Tang, "Transmission experiment of multi-gigabit coherent optical OFDM systems over 1000 km SSMF fibre," Electron. Lett. 43, 183-184 (2007).

IEEE Commun. Lett. (1)

X. Li, L. J. Cimini, "Effects of clipping and filtering on the performance of OFDM," IEEE Commun. Lett. 2, 131-133 (1998).

J. Lightw. Technol. (3)

X. Yi, W. Shieh, Y. Ma, "Phase noise effects on high spectral efficiency coherent optical OFDM transmission," J. Lightw. Technol. 26, 1309-1316 (2008).

S. L. Jansen, I. Morita, T. C. W. Schenk, N. Takeda, H. Tanaka, "Coherent optical 25.8-Gb/s OFDM transmission over 4160-km SSMF," J. Lightw. Technol. 26, 6-15 (2008).

M. Brodsky, "Polarization mode dispersion of installed fibers," J. Lightw. Technol. 24, 4584-4599 (2006).

J. Opt. Network. (1)

S. L. Jansen, I. Morita, T. C. W. Schenk, H. Tanaka, "Long-haul transmission of 16$\,\times\,$52.5 Gbits/s polarization-division-multiplexed OFDM enabled by MIMO processing," J. Opt. Network. 7, 173-182 (2008).

Opt. Lett. (1)

Other (11)

H. Takahashi, A. Al Amin, S. L. Jansen, I. Morita, H. Tanaka, "DWDM transmission with 7.0-bit/(s$\cdot$Hz) spectral efficiency using 8$\,\times\,$65.1-Gbit/s coherent PDM-OFDM signals," Opt. Fiber Commun. Conf. San DiegoCA (2009) Paper PDPB7.

J. G. Proakis, Digital Communications (McGraw-Hill, 2000) pp. 201-206.

M. Boroditsky, M. Brodsky, N. J. Frigo, P. Magill, H. Rosenfeldt, "Polarization dynamics in installed fiberoptic systems," Proc. LEOS (2005) pp. 414-415.

M. Nakazawa, "Challenges to FDM-QAM coherent transmission with ultrahigh spectral efficiency," Eur. Conf. Opt. Commun. BrusselsBelgium (2008) Paper Tu.1.E.1.

A. H. Gnauck, P. J. Winzer, C. R. Doerr, L. L. Buhl, "10$\,\times\,$112—Gb/s PDM 16–QAM transmission over 630 km of fiber with 6.2-b/s/Hz spectral efficiency," Opt. Fiber Commun. Conf. San DiegoCA (2009) Paper PDPB8.

H. Takahashi, A. A. Amin, S. L. Jansen, I. Morita, H. Tanaka, "8$\,\times\,$66.8-Gbit/s coherent PDM-OFDM transmission over 640 km of SSMF at 5.6-bit/s/Hz spectral efficiency," Eur. Conf. Opt. Commun. BrusselsBelgium (2008) Post-deadline Paper Th.3.E.4.

B. J. Schmidt, A. J. Lowery, J. Armstrong, "Experimental demonstrations of 20 Gbit/s direct-detection optical OFDM and 12 Gbit/s with a colorless transmitter," OFC 2007 AnaheimCA (2007) Post-deadline paper PDP18.

S. L. Jansen, I. Morita, H. Tanaka, "10$\,\times\,$121.9-Gb/s PDM-OFDM transmission with 2-b/s/Hz spectral efficiency over 1 000 km of SSMF," Opt. Fiber Commun. Conf. San DiegoCA (2008) Paper PDP 2.

A. Sano, E. Yamada, H. Masuda, E. Yamazaki, T. Kobayashi, E. Yoshida, Y. Miyamoto, S. Matsuoka, R. Kudo, K. Ishihara, Y. Takatori, M. Mizoguchi, K. Okada, K. Hagimoto, H. Yamazaki, S. Kamei, H. Ishii, "13.4-Tb/s (134$\,\times\,$111-Gb/s/ch) No-guard-interval coherent OFDM transmission over 3 600 km of SMF with 19-ps average PMD," Eur. Conf. Opt. Commun. BrusselsBelgium (2008) Post-deadline paper Th.3.E.1.

Q. Yang, Y. Ma, W. Shieh, "107 Gb/s coherent optical OFDM reception using orthogonal band multiplexing," Opt. Fiber Commun. Conf. San DiegoCA (2008) Paper PDP 7.

A. J. Lowery, L. Du, J. Armstrong, "Orthogonal frequency division multiplexing for adaptive dispersion compensation in long haul WDM systems," Proc. Opt. Fiber Commun. Conf. 2006 pp. 1-3.

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