March 2021 Issue
Feature Articles
Is Nothing Better Than Something?
The idea of guiding light through hollow pipes dates to the 19th century, but solid-core fibers made much better optical waveguides. Now the emerging technology of hollow-core fibers has resurrected an old idea.
by Jeff HechtSilicon Carbide: From Abrasives to Quantum Photonics
Traditionally used for abrasives, LEDs and transistors, the material may enable scalable quantum and nonlinear photonics through direct integration of solid-state qubits into photonic circuits.
by Daniil M. Lukin, Melissa A. Guidry and Jelena VučkovićDepartments and Columns
A widely cited 2018 paper in Optics Express considered how well optical transmission systems would meet the challenges ahead. Recently reported advances show that fiber is on track to meet those challenges. (For a look at advances in hollow-core fibers, see this month’s cover story.)
Course-Correcting a Career in Optics
An optical engineer at a lidar startup relates career advice he learned while navigating from academia to industry.
Also in this Issue
30, 20, and 10 Years Ago in OPN
Ultrashort pulse generation; wavelength-division multiplexing; first fibered city
QE Prize for Engineering / Honors to Ferguson and Zheludev / OSA Fellow stories / Capasso receives 2021 Ives Award / WeAreOSA / U.S. science policy / Ippen is OSA Honorary Member / Bennet becomes Applied Optics EiC / Deutsch Fellow / Remembering Kapany and Harris / Thanks, editors and volunteers

![Manual probe system with needles for test of semiconductor on silicon wafer. [A. Morozov / Getty]](https://opnmedia.blob.core.windows.net/$web/opn/media/images/articles/2025/1125/departments/202511-cover-web.jpg?ext=.jpg)
![Researcher Clara Saraceno in the lab. [Image by Carsten Behler Photography]](https://opnmedia.blob.core.windows.net/$web/opn/media/images/articles/2025/1025/departments/202510-cover-web.jpg?ext=.jpg)