Optical transmission: sending more data over a greater reach

• Keysight Technologies' chart plots the record-setting optical transmission systems of recent years.

Source: Keysight Technologies

The chart, compiled by Dr Fabio Pittalá, product planner, broadband and photonic center of excellence at Keysight, is an update of one previously published by Gazettabyte. 

The latest chart adds data from last year's conferences at OFC 2023 and ECOC 2023. And new optical transmission achievements can be expected at the upcoming OFC 2024 show, to be held in San Diego, CA in March.

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Marvell kickstarts the 800G coherent pluggable era

Marvell has become the first company to provide an 800-gigabit coherent digital signal processor (DSP) for use in pluggable optical modules.

The 5nm CMOS Orion chip supports a symbol rate of over 130 gigabaud (GBd), more than double that of the coherent DSPs for the OIF's 400ZR standard and 400ZR+.

Meanwhile, a CFP2-DCO pluggable module using the Orion can transmit a 400-gigabit data payload over 2,000km using the quadrature phase-shift keying (QPSK) modulation scheme.

The Orion DSP announcement is timely, given how this year will be the first when coherent pluggables exceed embedded coherent module port shipments.

This is the year coherent pluggable modules exceed embedded coherent port shipments. Source: LightCounting

"We strongly believe that pluggable coherent modules will cover most network use cases, including carrier and cloud data centre interconnect," says Samuel Liu, senior director of coherent DSP marketing at Marvell.

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ECOC 2023 industry reflections - Part 3

Gazettabyte is asking industry figures for their thoughts after attending the recent ECOC show in Glasgow. In particular, what developments and trends they noted, what they learned and what, if anything, surprised them. Here are responses from Coherent, Ciena, Marvell, Pilot Photonics, and Broadcom.

Near the River Clyde in Glasgow, where ECOC was held, was once the shipbuilding centre of the world.

Julie Eng, CTO of Coherent

It had been several years since I'd been to ECOC. Because of my background in the industry, with the majority of my career in data communications, I was pleasantly surprised to see that ECOC had transitioned from primarily telecommunications, and largely academic, into more industry participation, a much bigger exhibition, and a focus on datacom and telecom. There were many exciting talks and demos, but I don't think there were too many surprises.

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The market opportunity for linear drive optics

A key theme at OFC earlier this year that surprised many was linear drive optics. Its attention at the optical communications and networking event was intriguing because linear drive - based on using remote silicon to drive photonics - is not new.

Scott Wilkinson

"I spoke to one company that had a [linear drive] demo on the show floor," says Scott Wilkinson, lead analyst for networking components at Cignal AI. "They had been working on the technology for four years and were taken aback; they weren't expecting people to come by and ask about it. "

The cause of the buzz? Andy Bechtolsheim, famed investor, co-founder and chief development officer of network switching firm Arista Networks and, before that, a co-founder of Sun Microsystems.

"Andy came out and said this is a big deal, and that got many people talking about it," says Wilkinson, author of a recent linear drive market research report.

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Broadcom's first Jericho3 takes on AI's networking challenge

Broadcom’s Jericho silicon has taken an exciting turn.

Oozie Parizer

The Jericho devices are used for edge and core routers.

But the first chip of Broadcom’s next-generation Jericho is aimed at artificial intelligence (AI); another indicator, if one is needed, of AI’s predominance.

Dubbed the Jericho3-AI, the device networks AI accelerator chips that run massive machine-learning workloads.

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Brandon Collings

There are certain news items on media sites that nothing can prepare you for.

A post by Lumentum on LinkedIn paid tribute to the passing of CTO Brandon Collings, aged 51; the unfolding words revealing the magnitude of the company’s loss.

Brandon Collings was a wonderful person and a joy to know. He had that rarest gift of being able to explain complex technologies and make sense of trends with considered answers of extraordinary clarity.

Who else could explain the intricacies of a colourless, directionless, contention-less, flexible, reconfigurable optical add-drop multiplexer (ROADM) while describing the ROADM market as “glacially slow”?

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OpenLight's CEO on its silicon photonics strategy

Adam Carter, recently appointed the CEO of OpenLight, discusses the company’s strategy and the market opportunities for silicon photonics.

Adam Carter, CEO of OpenLight

Adam Carter’s path to becoming OpenLight’s first CEO is a circuitous one.

OpenLight, a start-up, offers the marketplace an open silicon photonics platform with integrated lasers and gain blocks.

Having worked at Cisco and Oclaro, which was acquired by Lumentum in 2018, Carter decided to take six months off. Covid then hit, prolonging his time out.

Carter returned as a consultant working with firms, including a venture capitalist (VC). The VC alerted him about OpenLight’s search for a CEO.

Carter’s interest in OpenLight was immediate. He already knew the technology and OpenLight’s engineering team and recognised the platform’s market potential.

“If it works in the way I think it can work, it [the platform] could be very interesting for many companies who don't have access to the [silicon photonics] technology,” says Carter.

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