Keysight and Nokia Bell Labs Achieve Record Symbol Rate of 260 GBaud Transmission in Coherent Optical Communications

SANTA ROSA, CA–(BUSINESS WIRE)–Keysight Technologies, Inc. (NYSE: KEYS), a leading technology company that delivers advanced design and validation solutions to accelerate innovation to connect and secure the world, and Nokia Bell Labs have successfully announced a 260-GBaud -Ultra-high performance- optical signal transmission speed over 100 km of standard single-mode fiber (SSMF) at the European Conference on Optical Communication (ECOC) 2022 in Basel, Switzerland, beating the previous record of 220 Gbaud.

Artificial Intelligence (AI), 5G and Internet of Things (IoT) applications are driving the demand for more bandwidth. The use of high symbol rate systems increases the aggregate information rate per wavelength to reduce the cost per bit in optical systems. A key trend in the telecom industry is the move to higher symbol rates through integrated optics, reducing component count, cost and power consumption.

With a shared goal of improving network performance and efficiency, Nokia Bell Labs and Keysight combined their expertise with other research partners to deliver the record-breaking demonstration of 260 Gbaud Dual Polarization Quadrature Phase Shift Keying (DP-QPSK) coherent transmission over 100 km singlemode to create fiber.

Keysight Technologies solution

The demonstration consisted of Keysight’s new 260 GSa/s Arbitrary Waveform Generator (AWG) (M8199B), which delivers more than 75 GHz bandwidth, and a thin-film lithium niobate I/Q modulator with 110 GHz bandwidth. This enables the development of transmission systems that operate with symbol rates up to 260 Gbaud and achieve net bit rates of more than 2 Tbit/s in coherent optical communication.

“Keysight is honored to work with Nokia Bell Labs to achieve 260 Gbaud,” said Dr. Joachim Peerlings, Vice President of Network and Data Center Solutions at Keysight. “The continued proliferation of AI requires new levels of server and network performance, which must scale computing resources within reasonable power limits. Higher data rates and new modulation formats will be among the key technologies for the industry.”

“We achieved this outstanding record of a maximum symbol rate of 260 Gbaud by leveraging enabling technologies and expertise from multiple partners,” said Haïk Mardoyan, Senior Research Scientist, Nokia Bell Labs. “This result is a first milestone to scale long-haul data transport systems to over 2 Tbit/s per wavelength. Improving the energy efficiency of transponders is an ongoing challenge for the industry.”

About Keysight Technologies

Keysight delivers advanced design and validation solutions that help accelerate innovation to connect and secure the world. Keysight’s commitment to speed and accuracy extends to software-driven insights and analytics that bring tomorrow’s technology products to market faster across the development lifecycle, in design simulation, prototype validation, automated software testing, manufacturing analysis, and optimization and visibility into network performance in the Company. Service Providers and Cloud Environments. Our customers span the global communications and industrial ecosystems, aerospace, defense, automotive, energy, semiconductor and general electronics markets. Keysight generated revenue of $4.9 billion in fiscal 2021. For more information about Keysight Technologies (NYSE: KEYS), visit

For more information on Keysight’s new 260 GSa/s Arbitrary Waveform Generator (AWG), visit -first-256-giga-samples-per-second.html.

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