Related Experiment Video
Updated: May 21, 2026

Quasi-light Storage for Optical Data Packets
Published on: February 6, 2014
1024 QAM (60 Gbit/s) single-carrier coherent optical transmission over 150 km
Yuki Koizumi1, Kazushi Toyoda, Masato Yoshida
1Research Institute of Electrical Communication, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai-shi, Miyagiken 980-8577 Japan. koizumi@riec.tohoku.ac.jp
Abstract:
We demonstrate a record QAM multiplicity of 1024 levels in a single-carrier coherent transmission. A frequency-domain equalization technique and a back-propagation method are adopted to compensate for distortions caused by hardware imperfections and fiber impairments, respectively. As a result, 60 Gbit/s polarization-multiplexed transmission over 150-km has been achieved at 3 Gsymbol/s within an optical bandwidth of only 4.05 GHz.
Related Concept Videos
Propagation Speed of Electromagnetic Waves
Energy Stored In A Coaxial Cable
In the simplest form, a coaxial cable can be represented by two long hollow concentric cylinders in which the current flows in opposite directions. The magnetic field inside and outside the coaxial cable is determined by using Ampère's law. The magnetic field inside...

