NEL introduces 64-GBaud coherent DSP for DWDM optical transport systems

NTT Electronics (NEL) has introduced its 64-GBaud coherent DSP for DWDM optical transport systems. By combining multiple baud rates and modulation-formats, from 100 Gbps per wavelength via 32-GBaud QPSK to 600 Gbps per wavelength with 64-GBaud 64QAM, the new DSP supports flexible line capacities. This feature maximizes per-fiber DWDM capacity, from 5 Tbps for ultra-long-haul reaches of tens of thousands of kilometers to more than 30 Tbps for 120-km ZR transmission reaches, using both C-band and L-band to double the capacity, says NEL.

NTT Electronics (NEL) has introduced its 64-GBaud coherent DSP for DWDM optical transport systems. By combining multiple baud rates and modulation-formats, from 100 Gbps per wavelength via 32-GBaudQPSK to 600 Gbps per wavelength with 64-GBaud 64QAM, the new DSP supports flexible line capacities. This feature maximizes per-fiber DWDM capacity, from 5 Tbps for ultra-long-haul reaches of tens of thousands of kilometers to more than 30 Tbps for 120-km ZR transmission reaches, using both C-band and L-band to double the capacity, says NEL.

NEL's new coherent DSP's high-speed real-time coherent processing at 64 GBaud enables thousands of kilometers LH transport at 200 Gbps perwavelength by dual-polarization quadrature phase-shift keying (DP-QPSK), hundreds of kilometers metro transport at 400 Gbps per wavelength by DP 16QAM, or 120 km ZR transport at 600 Gbps per wavelength by DP 64QAM.

The second offering in NEL's third-generation CMOS coherent DSP family, the 64-GBaud device has a new DSP core that uses Broadcom's 16-nm CMOS fin-FET high-speed mixed-signal technologies to improve per-lambda capacity by two-to-three times up to 600 Gbps per λ.

In 2016, NEL unveiled the ExaSPEED 200, its 16-nm device to support both 100G QPSK long-haul and 200G 16QAM metro optical links (see "NTT Electronics unveils 16-nm CMOS 100G/200G coherent DSP"). Compared with this offering, NEL's new DSP extends fiber reach by 60%, the company asserts

"Every service provider needs to maximize fiber capacity to meet increasing bandwidth demand," said Haruhiko Ichino, NEL executive vice president and general manager of broadband system and device business group. "We are strongly committed to be a pioneer in the coherent DSP innovation and to provide merchant-silicon solutions for cost-effective upgrades in LH, metro, and shorter-reach data center interconnect (DCI) applications."

NEL is sampling the new 64-GBaud coherent DSP to its early access partners and customers. Production release should follow in the second half of 2018.

For related articles, visit the Optical Technologies Topic Center.

For more information on communications semiconductors and suppliers, visit the Lightwave Buyer's Guide.

More in Optical Tech