With the massive proliferation of data-intensive services including high-resolution video streaming and conferencing, the growth of cloud services infrastructure in 2021 is expected to reach a CAGR of 27%. Therefore, while 400 gigabit Ethernet (GbE) is currently enjoying widespread deployment, 800 GbE is poised to follow quickly to meet these bandwidth demands.

One approach to 800 GbE is to install eight interfaces or optical channels of 100 gigabits per second (Gbit / s). As an alternative to reduce the number of hardware, increase reliability and reduce costs, a team of researchers from Lumentum has developed an optical solution that uses four channels of 200 Gbit / s wavelength to reach 800 GbE.

Syunya Yamauchi, Senior Optical Engineer at Lumentum, will present the optimized design during a session at the Fiber Optic Communication Conference and Exhibition (OFC), which will be held virtually from 06 to 11 June 2021.

“Active optical devices are the most important components of optical communication systems,” said Mike Staskus, vice president of Datacom product line management at Lumentum.

To achieve high-speed, high-bandwidth operations, the Yamauchi team developed a distributed feedback laser integrated with the localized element (EA-DFB) electroabsorption modulator (EA-DFB) capable of a transmission of 2 kilometers. – a transmission length requirement for many large modern data centers – 224 Gbit / s signals operating over a wide temperature range.

“There are tradeoffs between high bandwidth and modulation characteristics, such as extinction rate,” Staskus said. “We overcame the trade-off by optimizing the design of EA-DFB using a simplified packaging method. “

Compared to a conventional EA-DFB, the reduced capacitance and inductance of the LE EA-DFB resulting from the design and assembly optimizations in the EA modulator improves its power and bandwidth.

“It can enable the development of optical transceivers with twice the data rate of current 400GbE modules, without dramatically increasing costs and power consumption, using higher speed laser transmitter chips.” that don’t require energy-hungry thermoelectric coolers, ”Staskus said.

These results suggest that the LE EA-DFB could enable 800GbE applications, making this device a promising light source for future data center applications.

“Next-generation lasers using this same ‘toolbox’ of advanced semiconductor and packaging processes can enable higher speeds, longer ranges and lower costs with competitive levels of performance, reliability and efficiency. in energy consumption, ”Staskus said. “With the increase in various data streams and other Internet services, intra-data center links will require higher speeds, including 1.6 terabits per second and beyond. “

Listen to the research team

“PAM4 uncooled operation at 224 Gb / s of EA-DFB localized electrode lasers with 2 km transmission for an 800 GbE application”, Syunya Yamauchi, Koichiro Adachi, Hideaki Asakura, Hayato Takita, Yoshihiro Nakai, Yoriyoshi Yamaguchi, Masatoshi Mitaki , Ryosuke Nakajima, Shigehisa Tanaka, and Kazuhiko Naoe, Tuesday, June 8, 2021, 3:00 a.m. PDT (UTC – 7:00 a.m.).

Registration information

Accredited media and analysts wishing to cover OFC 2021 can find the registration and other essential information in the OFC media room. Check the OFC website for upcoming registration announcements, schedule updates and more.

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