NTT Electronics shipping 140-Gbaud ExaSPEED GAIA coherent DSP

March 16, 2023
The 5-nm FinFET CMOS DSP will support 1.2 Tbps per wavelength and features programmable baud rate and a flexible coded modulation scheme.

NTT Electronics says it has launched initial shipments of its 140-Gbaud ExaSPEED GAIA coherent DSP. The 5-nm FinFET CMOS DSP will support 1.2 Tbps per wavelength and features programmable baud rate and a flexible coded modulation scheme. NTT expects the ExaSPEED GAIA to be fully available in the second half of this year.

The programmable baud rate is designed to enable use of the ExaSPEED GAIA to support a range of fiber networking applications, including short-reach data center interconnect (DCI), terrestrial metro links with cascaded ROADMs, and ultra-long-haul submarine networks, with maximum spectral efficiency. NTT expects the DSP to be used to support multiple 400 Gigabit Ethernet (GbE) streams, depending on the application’s reach requirements – for example, 3x400GbE for DCI, 2x400GbE for metro, and 1x400GbE for subsea networks. ExaSPEED GAIA offers capacity tuning in 50G increments, NTT says.

Meanwhile, the DSP’s flexible coded modulation scheme leverages advanced constellation shaping, forward error correction (FEC), and high-order modulation, according to the company. Compensation algorithms the ExaSPEED GAIA employs include nonlinear distortion compensation, adaptive fast state of polarization (SOP) tracking, fast device and transmission characteristics estimation, and ultra-long CD compensation. NTT also offers a companion coherent driver module (UHB-CDM).

Fujitsu is a lead customer for the ExaSPEED GAIA and has employed it on the company’s recently announced 1FINITY Ultra Optical System. "We are very impressed with the performance of NTT Electronics’ latest ExaSPEED GAIA DSP," commented Hideki Matsui, vice head of the Photonics System Business Unit of Fujitsu Ltd. “This revolutionary DSP makes our products more competitive in the market and enables us to offer innovative solutions. It opens up a new 'terabit era,' which will be a game changer in our industry.”

“This state-of-the-art DSP, we believe, would be key to realize the future information-centric society,” added Akio Goto, general manager of the Photonics Device Development Division of NEC Corp. “We are excited to introduce ExaSPEED GAIA in conjunction with CDM in our DWDM products to build diverse, high-throughput, and green optical networks.”

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About the Author

Stephen Hardy | Editorial Director and Associate Publisher, Lightwave

Stephen Hardy is editorial director and associate publisher of Lightwave and Broadband Technology Report, part of the Lighting & Technology Group at Endeavor Business Media. Stephen is responsible for establishing and executing editorial strategy across the both brands’ websites, email newsletters, events, and other information products. He has covered the fiber-optics space for more than 20 years, and communications and technology for more than 35 years. During his tenure, Lightwave has received awards from Folio: and the American Society of Business Press Editors (ASBPE) for editorial excellence. Prior to joining Lightwave in 1997, Stephen worked for Telecommunications magazine and the Journal of Electronic Defense.

Stephen has moderated panels at numerous events, including the Optica Executive Forum, ECOC, and SCTE Cable-Tec Expo. He also is program director for the Lightwave Innovation Reviews and the Diamond Technology Reviews.

He has written numerous articles in all aspects of optical communications and fiber-optic networks, including fiber to the home (FTTH), PON, optical components, DWDM, fiber cables, packet optical transport, optical transceivers, lasers, fiber optic testing, and more.

You can connect with Stephen on LinkedIn as well as Twitter.

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