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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 26 — Dec. 12, 2011
  • pp: B958–B964
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1.12-Tb/s 32-QAM-OFDM superchannel with 8.6-b/s/Hz intrachannel spectral efficiency and space-division multiplexed transmission with 60-b/s/Hz aggregate spectral efficiency

Xiang Liu, S. Chandrasekhar, X. Chen, P. J. Winzer, Y. Pan, T. F. Taunay, B. Zhu, M. Fishteyn, M. F. Yan, J. M. Fini, E.M. Monberg, and F.V. Dimarcello  »View Author Affiliations


Optics Express, Vol. 19, Issue 26, pp. B958-B964 (2011)
http://dx.doi.org/10.1364/OE.19.00B958


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Abstract

We demonstrate the generation of a 1.12-Tb/s superchannel based on coherent optical orthogonal frequency-division multiplexing with polarization-division multiplexed 32-QAM subcarriers, achieving a net intrachannel-spectral-efficiency (ISE) of 8.6 b/s/Hz. Using space-division multiplexing (SDM), we transmit this superchannel over a 76.8-km low-crosstalk multi-core-fiber (MCF) with a record aggregate ISE of 60 b/s/Hz per fiber. We also discuss the impact of core-to-core crosstalk on transmission performance, as well as future perspectives of MCF-based SDM transmission.

© 2011 OSA

1. Introduction

To satisfy the ever-increasing capacity demand in optical fiber communications, both the spectral efficiency (SE) and the data rate carried by a wavelength channel have been increasing dramatically [1

1. A. R. Chraplyvy, “Plenary paper: the coming capacity crunch,” presented at 35th European Conference on Optical Communication, 2009. ECOC '09, Vienna, Austria, 20-24 Sept. 2009.

,2

2. M. Nakazawa, “Giant leaps in optical communication technologies towards 2030 and beyond,” Plenary Talk presented at 2010 36th European Conference on Optical Communication (ECOC), Torino Italy, 19-23 Sept. 2010.

]. Channel data rates of 1 Tb/s and beyond have been demonstrated using the superchannel concept [3

3. Y. Ma, Q. Yang, Y. Tang, S. Chen, and W. Shieh, “1-Tb/s single-channel coherent optical OFDM transmission with orthogonal-band multiplexing and subwavelength bandwidth access,” J. Lightwave Technol. 28(4), 308–315 (2010). [CrossRef]

6

6. D. Hillerkuss, R. Schmogrow, T. Schellinger, M. Jordan, M. Winter, G. Huber, T. Vallaitis, R. Bonk, P. Kleinow, F. Frey, M. Roeger, S. Koenig, A. Ludwig, A. Marculescu, J. Li, M. Hoh, M. Dreschmann, J. Meyer, S. Ben Ezra, N. Narkiss, B. Nebendahl, F. Parmigiani, P. Petropoulos, B. Resan, A. Oehler, K. Weingarten, T. Ellermeyer, J. Lutz, M. Moeller, M. Huebner, J. Becker, C. Koos, W. Freude, and J. Leuthold, “26 Tbit s-1 line-rate super-channel transmission utilizing all-optical fast optical fast Fourier transform processing,” Nat. Photonics 5(6), 364–371 (2011). [CrossRef]

], achieving intrachannel SEs (ISE, defined as the net channel bit rate divided by the channel’s spectral width) between ~4 and ~7 b/s/Hz. Using high-level quadrature-amplitude modulation (QAM), ISEs beyond 7 b/s/Hz have been demonstrated at sub-Tb/s data rates [7

7. X. Liu, S. Chandrasekhar, P. J. Winzer, S. Draving, J. Evangelista, N. Hoffman, B. Zhu, and D. W. Peckham, “Single coherent detection of a 606-Gb/s CO-OFDM signal with 32-QAM subcarrier modulation using 4x 80-Gsamples/s ADCs,” in 2010 36th European Conference on Optical Communication (ECOC) (2010), paper PD2.6.

9

9. D. Qian et al., “101.7-Tb/s (370x294-Gb/s) PDM-128QAM-OFDM Transmission over 3x55-km SSMF using pilot-based phase noise mitigation,”in Optical Fiber Communication Conference, OSA Technical Digest (CD) (Optical Society of America, 2011), paper PDPB5.

]. Space-division multiplexing (SDM) is being considered as a promising candidate technology to dramatically increase per-fiber capacity [1

1. A. R. Chraplyvy, “Plenary paper: the coming capacity crunch,” presented at 35th European Conference on Optical Communication, 2009. ECOC '09, Vienna, Austria, 20-24 Sept. 2009.

,2

2. M. Nakazawa, “Giant leaps in optical communication technologies towards 2030 and beyond,” Plenary Talk presented at 2010 36th European Conference on Optical Communication (ECOC), Torino Italy, 19-23 Sept. 2010.

,10

10. G. Li and X. Liu, “Focus issue: space multiplexed optical transmission,” Opt. Express 19(17), 16574–16575 (2011). [CrossRef] [PubMed]

]. Per-fiber capacities of over 100 Tb/s have been recently demonstrated by using SDM with multi-core fibers (MCFs) [11

11. J. Sakaguchi, Y. Awaji, N. Wada, A. Kanno, T. Kawanishi, T. Hayashi, T. Taru, T. Kobayashi, and M.Watanabe, “109-Tb/s (7x97x172-Gb/s) SDM/WDM/PDM) QPSK transmission through 16.8-km homogeneous multicore fiber”in Optical Fiber Communication Conference, OSA Technical Digest (CD) (Optical Society of America, 2011), paper PDPB6.

,12

12. B. Zhu, T. F. Taunay, M. Fishteyn, X. Liu, S. Chandrasekhar, M. F. Yan, J. M. Fini, E. M. Monberg, and F. V. Dimarcello, “112-Tb/s space-division multiplexed DWDM transmission with 14-b/s/Hz aggregate spectral efficiency over a 76.8-km seven-core fiber,” Opt. Express 19(17), 16665–16671 (2011). [CrossRef] [PubMed]

], surpassing with ease the highest capacity reported over single-mode fiber [13

13. D. Qian, M.-F. Huang, E. Ip, Y.-K. Huang, Y. Shao, J. Hu, and T. Wang, “101.7-Tb/s (370x294-Gb/s) PDM-128QAM-OFDM transmission over 3x55-km SSMF using pilot-based phase noise mitigation,” in Optical Fiber Communication Conference, OSA Technical Digest (CD) (Optical Society of America, 2011), paper PDPB5.

]. In this paper, we present in more depth our recent demonstration [14

14. X. Liu, S. Chandrasekhar, X. Chen, P. J. Winzer, Y. Pan, B. Zhu, T.F. Taunay, M. Fishteyn, M. F. Yan, J. M. Fini, E.M. Monberg, and F.V. Dimarcello, “1.12-Tb/s 32-QAM-OFDM superchannel with 8.6-b/s/Hz intrachannel spectral efficiency and space-division multiplexing with 60-b/s/Hz aggregate spectral efficiency,” in 2011 37th European Conference and Exhibition on Optical Communication (ECOC) (2011), post-deadline paper Th.13.B.1.

] of the generation and detection of a 1.12-Tb/s superchannel based on coherent optical orthogonal frequency-division multiplexing (CO-OFDM) with polarization-division-multiplexed (PDM) 32-QAM subcarriers, achieving an ISE of 8.6 b/s/Hz. We further leverage SDM to demonstrate a record aggregate ISE of 60 b/s/Hz per fiber over a 76.8-km MCF [14

14. X. Liu, S. Chandrasekhar, X. Chen, P. J. Winzer, Y. Pan, B. Zhu, T.F. Taunay, M. Fishteyn, M. F. Yan, J. M. Fini, E.M. Monberg, and F.V. Dimarcello, “1.12-Tb/s 32-QAM-OFDM superchannel with 8.6-b/s/Hz intrachannel spectral efficiency and space-division multiplexing with 60-b/s/Hz aggregate spectral efficiency,” in 2011 37th European Conference and Exhibition on Optical Communication (ECOC) (2011), post-deadline paper Th.13.B.1.

]. Finally, we discuss the impact of core-to-core crosstalk on the transmission performance of the high-ISE superchannel.

2. Superchannel generation at 1.12 Tb/s with an ISE of 8.6 b/s/Hz

Figure 1
Fig. 1 Schematic of the experimental setup of the 1.12-Tb/s superchannel transmitter. Insets (a-f) show the schematic outputs (in the frequency domain) and the measured optical spectra at different stages in the transmitter. EDFA: Erbium-doped fiber amplifier; PBC: polarization-beam combiner.
shows the schematic of the experimental setup for the generation of the superchannel. An external cavity laser (ECL) at 1548.3 nm with a linewidth of ~100 kHz was used as the laser source. A 5-comb generator, based on a Mach-Zehnder modulator (MZM) driven by a 25.94-GHz sine-wave with ~3Vπ amplitude, generated five frequency-locked carriers with a spacing of 25.94 GHz. A wavelength-selective switch (WSS) was configured to have a 3-dB bandwidth of 120 GHz to reject the unwanted harmonics generated by the 5-comb generator. A novel 4-comb generator, based on a nested MZM whose two branches were respectively driven by 3.24-GHz and 9.73-GHz sine-waves with ~1Vπ amplitudes, quadrupled the number of frequency-locked carriers to 20 with a carrier spacing of 6.48 GHz. The phase between the two branches was set to π to suppress the unwanted DC carrier. The optical spectra of the generated carriers at different stages are shown as insets in Fig. 1. Remarkably, all the unwanted harmonics were rejected to be over ~35 dB down. The 20 carriers were then modulated by a PDM I/Q modulator to generate a PDM-32QAM-OFDM superchannel. Note that the 20 carriers had different optical phases, as previously shown for the MZM-based comb generator [15

15. T. Healy, F. C. Garcia Gunning, A. D. Ellis, and J. D. Bull, “Multi-wavelength source using low drive-voltage amplitude modulators for optical communications,” Opt. Express 15(6), 2981–2986 (2007). [CrossRef] [PubMed]

], so the 20 subchannels in the superchannel were effectively phase de-correlated, in addition to the intrinsic de-correlation of the subcarriers in each OFDM subchannel. It would be more preferred to also de-correlate the intensity profiles of these subchannels, but due to limited hardware resource, this experiment was conducted with the intensity profiles being correlated. The measured signal’s nonlinear tolerance is expected to be slightly worse than what it would be with both phase and amplitude de-correlation. The x- and y-polarization components of the PDM signal were independently modulated to better emulate a real transmitter. Four independent drive patterns were stored in two synchronized arbitrary waveform generators (AWGs), each having two 10-GS/s digital-to-analog converters (DACs). Pseudo-random bit sequences (PRBS) of length 215-1 were used as the payload data. The IFFT size used for OFDM was 128, and the guard-interval (GI) was 2 samples, resulting in a small GI-overhead of 1.56%. Each polarization component of an OFDM symbol contained 78 32-QAM data subcarriers (SCs), 4 pilot SCs, one unfilled DC SC, and 45 unfilled edge SCs. The spectral bandwidth of each modulated subchannel was 6.48 GHz (=83/128×10GHz), and the 20 frequency-locked 6.48-GHz-spaced input carriers enabled seamless superchannel formation with a total bandwidth of 130 GHz, as shown in inset (f). Three correlated dual-polarization training symbols (TSs) [7

7. X. Liu, S. Chandrasekhar, P. J. Winzer, S. Draving, J. Evangelista, N. Hoffman, B. Zhu, and D. W. Peckham, “Single coherent detection of a 606-Gb/s CO-OFDM signal with 32-QAM subcarrier modulation using 4x 80-Gsamples/s ADCs,” in 2010 36th European Conference on Optical Communication (ECOC) (2010), paper PD2.6.

] were used for every 697 payload OFDM symbols, resulting in a small TS-overhead of 0.43%. Excluding 7% overhead for forward-error correction [16

16. F. Chang, K. Onohara, and T. Mizuochi, “Forward error correction for 100 G transport networks,” IEEE Commun. Mag. 48(3), S48–S55 (2010). [CrossRef]

], the net payload data rate of the superchannel was 1.12 Tb/s (=10GHz × 10b/s/Hz × 78/130 × 697/700 × 20/1.07), corresponding to a net ISE of 8.61 b/s/Hz (=1.12Tb/s/129.7GHz). With SDM in a seven-core fiber, the aggregate per-fiber ISE became 60 b/s/Hz. This superchannel could likely be put on a 150-GHz grid with <-40 dB crosstalk to neighbors, as indicated in inset (f), to achieve an aggregate SE of 52 b/s/Hz in a wavelength-division multiplexed (WDM) system.

3. SDM in a 7-core fiber for an aggregate ISE per fiber of 60 b/s/Hz

For SDM-based transmission, and as shown in Fig. 2
Fig. 2 Schematic of the experimental setup for superchannel transmission and detection. Insets: (a) a typical recovered signal constellation of the 32-QAM subcarriers; (b) illustration of launching into the seven cores of the MCF with multiple multi-level signals.
, the superchannel was split into 8 copies by a 1×8 splitter, whose seven outputs were delay de-correlated and amplified by seven erbium-doped fiber amplifiers (EDFAs) before launching into a 76.8-km seven-core-fiber [12

12. B. Zhu, T. F. Taunay, M. Fishteyn, X. Liu, S. Chandrasekhar, M. F. Yan, J. M. Fini, E. M. Monberg, and F. V. Dimarcello, “112-Tb/s space-division multiplexed DWDM transmission with 14-b/s/Hz aggregate spectral efficiency over a 76.8-km seven-core fiber,” Opt. Express 19(17), 16665–16671 (2011). [CrossRef] [PubMed]

] through a tapered multi-core connector (TMC). After transmission, a second TMC was used to couple out the signals, which were then amplified to compensate for the fiber loss. An optical switch (SW) was used to direct the received signal from each of the seven cores to a digital coherent receiver with offline digital signal processing (DSP). An optical local oscillator (OLO) was another ECL whose frequency was tuned to the center of each of the 20 subchannels. Electronic low-pass filters (LPFs) with 6-GHz bandwidth were used before the analog-to-digital converters (ADCs) to select a subchannel for measurement. Digitized waveforms of 1-million samples each were processed offline in a computer to perform electronic dispersion compensation, nonlinear compensation (NLC), polarization de-multiplexing, frequency/phase recovery, and bit error ratio (BER) measurement using previously reported PDM-OFDM algorithms [7

7. X. Liu, S. Chandrasekhar, P. J. Winzer, S. Draving, J. Evangelista, N. Hoffman, B. Zhu, and D. W. Peckham, “Single coherent detection of a 606-Gb/s CO-OFDM signal with 32-QAM subcarrier modulation using 4x 80-Gsamples/s ADCs,” in 2010 36th European Conference on Optical Communication (ECOC) (2010), paper PD2.6.

].

4. Experimental results

Since spatial crosstalk will be a major design factor for future SDM systems, it is of interest to investigate the impact of core-to-core crosstalk on the transmission performance of this 32-QAM superchannel. Figure 6
Fig. 6 Measured BER performance of the superchannel after passing through the center core of the 76.8-km MCF with Pincenter = 2 dBm but different signal power loadings on the 6 outer cores.
shows the BER performance of the superchannel after passing through the center core (core index 1) of the 76.8-km MCF with 2-dBm launch power but with different signal power loadings on the 6 outer cores. The mean BER for the case with no signals in the outer cores is essentially the same (within experimental error) as that with equal signal power in all cores, indicating negligible core-to-core crosstalk penalty. Considering the low total crosstalk from the 6 outer cores to the center core of about −35 dB at the signal wavelength [12

12. B. Zhu, T. F. Taunay, M. Fishteyn, X. Liu, S. Chandrasekhar, M. F. Yan, J. M. Fini, E. M. Monberg, and F. V. Dimarcello, “112-Tb/s space-division multiplexed DWDM transmission with 14-b/s/Hz aggregate spectral efficiency over a 76.8-km seven-core fiber,” Opt. Express 19(17), 16665–16671 (2011). [CrossRef] [PubMed]

], we can calculate the expected crosstalk penalty using the results from a recent study on the impact of coherent crosstalk on n-QAM signals [18

18. P. J. Winzer, A. H. Gnauck, A. Konczykowska, F. Jorge, and J.-Y. Dupuy, “Penalties from in-band crosstalk for advanced optical modulation formats,” in 2011 37th European Conference and Exhibition on Optical Communication (ECOC) (2011), paper Tu.5.B.7.

]. The crosstalk penalty on the center-core signal when all the six outer cores are populated with signals each having the same power as the center-core signal is expected to be ~0.08 dB. This confirms that the low-crosstalk seven-core fiber can indeed support single-span transmission of high-level modulation formats such as 32-QAM with negligible penalty.

5. Discussion

To reduce the cost per bit in MCF-based SDM transmission systems compared to conventional systems using parallel strands of single-core fibers, there are still several aspects that need to be addressed. As illustrated in Fig. 8
Fig. 8 Illustration of key enabling components desired for future MCF-based SDM transmission.MC-EDFA: multi-core Erbium-doped fiber amplifier; TX/RX: transmitter/receiver.
, the desired enabling components include MCFs with further reduced loss, crosstalk, and nonlinear coefficient, multi-core Erbium-doped fiber amplifiers with direct coupling to the MCF, reconfigurable optical add/drop multiplexers (ROADMs) able to work with MCF in an integrated fashion, as well as photonic integrated circuits (PICs) that take advantage of the high mode density of MCF to reduce transponder size and cost.

6. Summary

We have experimentally demonstrated the generation and detection of a 1.12-Tb/s PDM-32-QAM-OFDM superchannel with a small implementation penalty and with a record ISE of 8.6 b/s/Hz for Tb/s-class superchannels. Key enablers include the generation of 20 high-quality frequency-locked carriers, simultaneous modulation of both polarizations of the PDM signal, and a low overhead used for OFDM signal processing. We have further demonstrated a record aggregate per-fiber ISE of 60 b/s/Hz by transmitting the 1.12-Tb/s superchannel over a 76.8-km seven-core fiber, with negligible core-to-core crosstalk penalty. We have discussed implications of core-to-core crosstalk in long-haul transmission systems through crosstalk emulation. Our demonstration shows the potential of the combination of high-SE signal formats and MCF-based SDM, together with the development of other enabling multi-core-specific components, to dramatically increase the achievable spectral efficiency as well as the capacity of a single fiber for sustaining the capacity growth of future optical transport systems.

Acknowledgments

References and links

1.

A. R. Chraplyvy, “Plenary paper: the coming capacity crunch,” presented at 35th European Conference on Optical Communication, 2009. ECOC '09, Vienna, Austria, 20-24 Sept. 2009.

2.

M. Nakazawa, “Giant leaps in optical communication technologies towards 2030 and beyond,” Plenary Talk presented at 2010 36th European Conference on Optical Communication (ECOC), Torino Italy, 19-23 Sept. 2010.

3.

Y. Ma, Q. Yang, Y. Tang, S. Chen, and W. Shieh, “1-Tb/s single-channel coherent optical OFDM transmission with orthogonal-band multiplexing and subwavelength bandwidth access,” J. Lightwave Technol. 28(4), 308–315 (2010). [CrossRef]

4.

S. Chandrasekhar, X. Liu, B. Zhu, and D. W. Peckham, “Transmission of a 1.2-Tb/s 24-carrier no-guard-interval CO-OFDM superchannel over 7200-km of ultra-large-area fiber,” in 35th European Conference on Optical Communication, 2009. ECOC '09 (2009), paper PD2.6.

5.

T. Xia, G. Wellbrock, Y Huang, E. Ip, M Huang, Y. Shao, T. Wang, Y. Aono, T. Tajima, S. Murakami, and M. Cvijetic, "Field experiment with mixed line-rate transmission (112-Gb/s, 450-Gb/s, and 1.15-Tb/s) over 3,560 km of installed fiber using filterless coherent receiver and EDFAs only," in Optical Fiber Communication Conference, OSA Technical Digest (CD) (Optical Society of America, 2011), paper PDPA3.

6.

D. Hillerkuss, R. Schmogrow, T. Schellinger, M. Jordan, M. Winter, G. Huber, T. Vallaitis, R. Bonk, P. Kleinow, F. Frey, M. Roeger, S. Koenig, A. Ludwig, A. Marculescu, J. Li, M. Hoh, M. Dreschmann, J. Meyer, S. Ben Ezra, N. Narkiss, B. Nebendahl, F. Parmigiani, P. Petropoulos, B. Resan, A. Oehler, K. Weingarten, T. Ellermeyer, J. Lutz, M. Moeller, M. Huebner, J. Becker, C. Koos, W. Freude, and J. Leuthold, “26 Tbit s-1 line-rate super-channel transmission utilizing all-optical fast optical fast Fourier transform processing,” Nat. Photonics 5(6), 364–371 (2011). [CrossRef]

7.

X. Liu, S. Chandrasekhar, P. J. Winzer, S. Draving, J. Evangelista, N. Hoffman, B. Zhu, and D. W. Peckham, “Single coherent detection of a 606-Gb/s CO-OFDM signal with 32-QAM subcarrier modulation using 4x 80-Gsamples/s ADCs,” in 2010 36th European Conference on Optical Communication (ECOC) (2010), paper PD2.6.

8.

X. Zhou, L. E. Nelson, P. Magill, B. Zhu, D. W. Peckham, “8x450-Gb/s, 50-GHz-spaced, PDM-32QAM transmission over 400km and one 50GHz-hrid ROADM,” in Optical Fiber Communication Conference, OSA Technical Digest (CD) (Optical Society of America, 2011), paper PDPB3.

9.

D. Qian et al., “101.7-Tb/s (370x294-Gb/s) PDM-128QAM-OFDM Transmission over 3x55-km SSMF using pilot-based phase noise mitigation,”in Optical Fiber Communication Conference, OSA Technical Digest (CD) (Optical Society of America, 2011), paper PDPB5.

10.

G. Li and X. Liu, “Focus issue: space multiplexed optical transmission,” Opt. Express 19(17), 16574–16575 (2011). [CrossRef] [PubMed]

11.

J. Sakaguchi, Y. Awaji, N. Wada, A. Kanno, T. Kawanishi, T. Hayashi, T. Taru, T. Kobayashi, and M.Watanabe, “109-Tb/s (7x97x172-Gb/s) SDM/WDM/PDM) QPSK transmission through 16.8-km homogeneous multicore fiber”in Optical Fiber Communication Conference, OSA Technical Digest (CD) (Optical Society of America, 2011), paper PDPB6.

12.

B. Zhu, T. F. Taunay, M. Fishteyn, X. Liu, S. Chandrasekhar, M. F. Yan, J. M. Fini, E. M. Monberg, and F. V. Dimarcello, “112-Tb/s space-division multiplexed DWDM transmission with 14-b/s/Hz aggregate spectral efficiency over a 76.8-km seven-core fiber,” Opt. Express 19(17), 16665–16671 (2011). [CrossRef] [PubMed]

13.

D. Qian, M.-F. Huang, E. Ip, Y.-K. Huang, Y. Shao, J. Hu, and T. Wang, “101.7-Tb/s (370x294-Gb/s) PDM-128QAM-OFDM transmission over 3x55-km SSMF using pilot-based phase noise mitigation,” in Optical Fiber Communication Conference, OSA Technical Digest (CD) (Optical Society of America, 2011), paper PDPB5.

14.

X. Liu, S. Chandrasekhar, X. Chen, P. J. Winzer, Y. Pan, B. Zhu, T.F. Taunay, M. Fishteyn, M. F. Yan, J. M. Fini, E.M. Monberg, and F.V. Dimarcello, “1.12-Tb/s 32-QAM-OFDM superchannel with 8.6-b/s/Hz intrachannel spectral efficiency and space-division multiplexing with 60-b/s/Hz aggregate spectral efficiency,” in 2011 37th European Conference and Exhibition on Optical Communication (ECOC) (2011), post-deadline paper Th.13.B.1.

15.

T. Healy, F. C. Garcia Gunning, A. D. Ellis, and J. D. Bull, “Multi-wavelength source using low drive-voltage amplitude modulators for optical communications,” Opt. Express 15(6), 2981–2986 (2007). [CrossRef] [PubMed]

16.

F. Chang, K. Onohara, and T. Mizuochi, “Forward error correction for 100 G transport networks,” IEEE Commun. Mag. 48(3), S48–S55 (2010). [CrossRef]

17.

X. Liu, F. Buchali, and R. W. Tkach, “Improving the nonlinear tolerance of polarization-division-multiplexed CO-OFDM in long-haul fiber transmission,” J. Lightwave Technol. 27(16), 3632–3640 (2009). [CrossRef]

18.

P. J. Winzer, A. H. Gnauck, A. Konczykowska, F. Jorge, and J.-Y. Dupuy, “Penalties from in-band crosstalk for advanced optical modulation formats,” in 2011 37th European Conference and Exhibition on Optical Communication (ECOC) (2011), paper Tu.5.B.7.

19.

S. Chandrasekhar, A. H. Gnauck, X. Liu, P. J. Winzer, Y. Pan, E. C. Burrows, B. Zhu, T.F. Taunay, M. Fishteyn, M. F. Yan, J. M. Fini, E.M. Monberg, and F.V. Dimarcello, “WDM/SDM transmission of 10 x 128-Gb/s PDM-QPSK over 2688-km 7-core fiber with a per-fiber net aggregate spectral-efficiency distance product of 40,320 km⋅b/s/Hz,” in 2011 37th European Conference and Exhibition on Optical Communication (ECOC) (2011), paper Th.13.C.4.

OCIS Codes
(060.1660) Fiber optics and optical communications : Coherent communications
(060.2330) Fiber optics and optical communications : Fiber optics communications
(060.4230) Fiber optics and optical communications : Multiplexing

ToC Category:
Subsystems for Optical Networks

History
Original Manuscript: November 7, 2011
Revised Manuscript: November 22, 2011
Manuscript Accepted: November 29, 2011
Published: December 12, 2011

Virtual Issues
European Conference on Optical Communication 2011 (2011) Optics Express

Citation
Xiang Liu, S. Chandrasekhar, X. Chen, P. J. Winzer, Y. Pan, T. F. Taunay, B. Zhu, M. Fishteyn, M. F. Yan, J. M. Fini, E.M. Monberg, and F.V. Dimarcello, "1.12-Tb/s 32-QAM-OFDM superchannel with 8.6-b/s/Hz intrachannel spectral efficiency and space-division multiplexed transmission with 60-b/s/Hz aggregate spectral efficiency," Opt. Express 19, B958-B964 (2011)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-19-26-B958


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References

  1. A. R. Chraplyvy, “Plenary paper: the coming capacity crunch,” presented at 35th European Conference on Optical Communication, 2009. ECOC '09, Vienna, Austria, 20-24 Sept. 2009.
  2. M. Nakazawa, “Giant leaps in optical communication technologies towards 2030 and beyond,” Plenary Talk presented at 2010 36th European Conference on Optical Communication (ECOC), Torino Italy, 19-23 Sept. 2010.
  3. Y. Ma, Q. Yang, Y. Tang, S. Chen, and W. Shieh, “1-Tb/s single-channel coherent optical OFDM transmission with orthogonal-band multiplexing and subwavelength bandwidth access,” J. Lightwave Technol.28(4), 308–315 (2010). [CrossRef]
  4. S. Chandrasekhar, X. Liu, B. Zhu, and D. W. Peckham, “Transmission of a 1.2-Tb/s 24-carrier no-guard-interval CO-OFDM superchannel over 7200-km of ultra-large-area fiber,” in 35th European Conference on Optical Communication, 2009. ECOC '09 (2009), paper PD2.6.
  5. T. Xia, G. Wellbrock, Y Huang, E. Ip, M Huang, Y. Shao, T. Wang, Y. Aono, T. Tajima, S. Murakami, and M. Cvijetic, "Field experiment with mixed line-rate transmission (112-Gb/s, 450-Gb/s, and 1.15-Tb/s) over 3,560 km of installed fiber using filterless coherent receiver and EDFAs only," in Optical Fiber Communication Conference, OSA Technical Digest (CD) (Optical Society of America, 2011), paper PDPA3.
  6. D. Hillerkuss, R. Schmogrow, T. Schellinger, M. Jordan, M. Winter, G. Huber, T. Vallaitis, R. Bonk, P. Kleinow, F. Frey, M. Roeger, S. Koenig, A. Ludwig, A. Marculescu, J. Li, M. Hoh, M. Dreschmann, J. Meyer, S. Ben Ezra, N. Narkiss, B. Nebendahl, F. Parmigiani, P. Petropoulos, B. Resan, A. Oehler, K. Weingarten, T. Ellermeyer, J. Lutz, M. Moeller, M. Huebner, J. Becker, C. Koos, W. Freude, and J. Leuthold, “26 Tbit s-1 line-rate super-channel transmission utilizing all-optical fast optical fast Fourier transform processing,” Nat. Photonics5(6), 364–371 (2011). [CrossRef]
  7. X. Liu, S. Chandrasekhar, P. J. Winzer, S. Draving, J. Evangelista, N. Hoffman, B. Zhu, and D. W. Peckham, “Single coherent detection of a 606-Gb/s CO-OFDM signal with 32-QAM subcarrier modulation using 4x 80-Gsamples/s ADCs,” in 2010 36th European Conference on Optical Communication (ECOC) (2010), paper PD2.6.
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