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
Sep 28, 2022
Learn how our acquisition of FishTail Design Automation unifies end-to-end timing constraints generation and verification during the chip design process. The post Synopsys Acquires FishTail Design Automation, Unifying Constraints Handling for Enhanced Chip Design Process app...
Sep 28, 2022
You might think that hearing aids are a bit of a sleepy backwater. Indeed, the only time I can remember coming across them in my job at Cadence was at a CadenceLIVE Europe presentation that I never blogged about, or if I did, it was such a passing reference that Google cannot...
Sep 22, 2022
On Monday 26 September 2022, Earth and Jupiter will be only 365 million miles apart, which is around half of their worst-case separation....

featured video

Embracing Photonics and Fiber Optics in Aerospace and Defense Applications

Sponsored by Synopsys

We sat down with Jigesh Patel, Technical Marketing Manager of Photonic Solutions at Synopsys, to learn the challenges and benefits of using photonics in Aerospace and Defense systems.

Read the Interview online

featured paper

Algorithm Verification with FPGAs and ASICs

Sponsored by MathWorks

Developing new FPGA and ASIC designs involves implementing new algorithms, which presents challenges for verification for algorithm developers, hardware designers, and verification engineers. This eBook explores different aspects of hardware design verification and how you can use MATLAB and Simulink to reduce development effort and improve the quality of end products.

Click here to read more

featured chalk talk

NEUTRIK® FIBERFOX

Sponsored by Mouser Electronics and Neutrik

Fiber optic technology has seen exponential growth over the last couple years. Today, fiber optic technology is finding a place in more and more diverse applications worldwide. In this episode of Chalk Talk, Amelia Dalton and David Kuklinski from NEUTRIK® explore a revolutionary new kind of fiber optic technology called FIBERFOX. We take a closer look at the benefits that FIBERFOX brings to the table, why FIBERFOX's expanded beam technology makes it unlike any other fiber optic technology on the market today and how you can use FIBERFOX in your next design.

Click here for more information about NEUTRIK FIBERFOX Expanded Beam Fiber Optic Connectors