Abstract

112Gbit/sec DSP-based single channel transmission of PAM4 at 56Gbaud over 15GHz of effective analog bandwidth is experimentally demonstrated. The DSP enables use of mature 25G optoelectronics for 2-10km datacenter intra-connections, and 8Tbit/sec over 80km interconnections between data centers.

© 2015 Optical Society of America

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References

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  1. X. Song, J. Man, and L. Zeng, “Investigation of 4x112Gbps PAM4 configuration for the km SMF PMD,” presented at the IEEE 802.3bs 400GbE task force (May 2014).
  2. M. Mazzini, “Technical feasibility of 56Gbaud PAM4 optical link budget based on experimental measurements,” presented at the IEEE 802.3bs 400GbE task force (August 2014).
  3. J. G. Proakis, Digital Communications (McGraw-Hill, 1995).
  4. G. Dorman, D. Sadot, and A. Gorshtein, “Enhanced equalization based on a combination of reduced complexity MLSE and linear equalizer for heavily ISI-induced signals,” US Patent Provisional 61/946,960 (March 2014).

Other (4)

X. Song, J. Man, and L. Zeng, “Investigation of 4x112Gbps PAM4 configuration for the km SMF PMD,” presented at the IEEE 802.3bs 400GbE task force (May 2014).

M. Mazzini, “Technical feasibility of 56Gbaud PAM4 optical link budget based on experimental measurements,” presented at the IEEE 802.3bs 400GbE task force (August 2014).

J. G. Proakis, Digital Communications (McGraw-Hill, 1995).

G. Dorman, D. Sadot, and A. Gorshtein, “Enhanced equalization based on a combination of reduced complexity MLSE and linear equalizer for heavily ISI-induced signals,” US Patent Provisional 61/946,960 (March 2014).

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Figures (7)

Fig. 1
Fig. 1 (a) Data centers new architectures and interconnections, and (b) Interconnection between data centers; up to 8Tbit/sec with 80 DWDM channels over a single compensated fiber.
Fig. 2
Fig. 2 Single channel 100Gbit/Sec IC block diagram.
Fig. 3
Fig. 3 (a) Channel impulse response, 8 taps are observed; (b) measured received signal spectrum, and estimated noise spectrum, vs. normalized frequency.
Fig. 4
Fig. 4 (a) Received PAM4 signal, and (b) PAM4 signal at the mid stage DSP.
Fig. 5
Fig. 5 Long reach 80km point-to-point setup.
Fig. 6
Fig. 6 BER versus received OSNR for 80km WDM link.
Fig. 7
Fig. 7 Comparison between measured and theoretical BER.

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