Power efficient subcarrier modulation for intensity modulated channels.
We compare formats for optical intensity modulation limited by thermal noise with the assumption of having ideal devices. At the same bitrate and bandwidth, a hitherto unknown format turns out to be more power efficient than known formats. This new modulation, which is a hybrid between on-off keying and phase-shift keying, belongs to the subcarrier modulation family. At asymptotically high signal-to-noise ratios, this hybrid scheme has a 1.2 dB average electrical power gain and 0.6 dB average optical power gain compared to OOK, while it has a 3.0 dB average electrical power gain and 2.1 dB average optical power gain compared to subcarrier QPSK.
Karout
Johnny
J
Department of Signals and Systems, Chalmers University of Technology, SE-412 96 Göteborg, Sweden. johnny.karout@chalmers.se
Agrell
Erik
E
Karlsson
Magnus
M
D016477:Artifacts; D004867:Equipment Design; D005336:Fiber Optic Technology / Q000295:instrumentation* / Q000379:methods*; D007834:Lasers; D008962:Models, Theoretical; D013685:Telecommunications / Q000295:instrumentation*