Which is the most power-efficient modulation format in optical links?
Journal article, 2009

By exploiting the electromagnetic wave's four-dimensional signal space, we find that for the additive white Gaussian noise channel, the modulation format with best sensitivity to be an 8-level format with 1.76 dB asymptotic gain over BPSK, for uncoded optical transmission with coherent detection. Low-complexity modulators are presented for the format, as well as an interpretation in terms of quantum-limited sensitivity.


Magnus Karlsson

Chalmers, Microtechnology and Nanoscience (MC2), Photonics

Erik Agrell

Chalmers, Signals and Systems, Communication and Antenna Systems, Communication Systems

Optics Express

1094-4087 (ISSN)

Vol. 17 13 10814-10819

Areas of Advance

Information and Communication Technology

Subject Categories


Electrical Engineering, Electronic Engineering, Information Engineering



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