editor's blog
Subscribe Now

When Greater Extinction Is a Good Thing

Earlier this year we got some comment from French research consortium Leti on the photonics research they were doing and where they saw it going.

More recently, they’ve announced that their HELIOS project was able to achieve the first-ever 40 Gb/s optical modulator having  an extinction ratio (more or less like the noise margin, the power difference between a logic 0 and a logic 1 – why optical needs a different vocabulary, I don’t know…) of 10 db.

This was done on a CMOS-friendly process for straightforward integration with other circuits.

I asked what was done differently to achieve this, and they were somewhat coy, noting a “well-mastered design.” More specifically, “To insure a precise doping profile [, which] is mandatory for silicon depletion modulators, the patented self-alignment technique gave a well defined junction. Then optimization of the doping and fabrication of thick electrodes helped to achieve this [result] as well as optimized design for the RF electrodes.” They’re promising higher RF speeds in the future.

I also asked whether this was a proof-of-concept project, or whether the result was transferrable to commercial use. They said they used standard processing techniques, getting good yields on 200-mm wafers, so that, whenever the market is ready, this can be moved into production.

More info on their release

Leave a Reply

featured blogs
Apr 16, 2024
In today's semiconductor era, every minute, you always look for the opportunity to enhance your skills and learning growth and want to keep up to date with the technology. This could mean you would also like to get hold of the small concepts behind the complex chip desig...
Apr 11, 2024
See how Achronix used our physical verification tools to accelerate the SoC design and verification flow, boosting chip design productivity w/ cloud-based EDA.The post Achronix Achieves 5X Faster Physical Verification for Full SoC Within Budget with Synopsys Cloud appeared ...
Mar 30, 2024
Join me on a brief stream-of-consciousness tour to see what it's like to live inside (what I laughingly call) my mind...

featured video

How MediaTek Optimizes SI Design with Cadence Optimality Explorer and Clarity 3D Solver

Sponsored by Cadence Design Systems

In the era of 5G/6G communication, signal integrity (SI) design considerations are important in high-speed interface design. MediaTek’s design process usually relies on human intuition, but with Cadence’s Optimality Intelligent System Explorer and Clarity 3D Solver, they’ve increased design productivity by 75X. The Optimality Explorer’s AI technology not only improves productivity, but also provides helpful insights and answers.

Learn how MediaTek uses Cadence tools in SI design

featured chalk talk

PIC32CX-BZ2 and WBZ451 Multi-Protocol Wireless MCU Family
Sponsored by Mouser Electronics and Microchip
In this episode of Chalk Talk, Amelia Dalton and Shishir Malav from Microchip explore the benefits of the PIC32CX-BZ2 and WBZ45 Multi-protocol Wireless MCU Family and how it can make IoT design easier than ever before. They investigate the components included in this multi-protocol wireless MCU family, the details of the software architecture included in this solution, and how you can utilize these MCUs in your next design.
May 4, 2023
39,785 views