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In small satellite communication technique we can use optical spectrum (optical (laser) communication system). The common and simplest modulation techniques used are On and Off keying (OOK), Q-ary PPM (Quaternary Pulse Position modulation) and Frequency Shift Keying (FSK).

Could someone explain why the PSK - modulations (BPSK, QPSK) could be not used in the optic communication in satellite?

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  • $\begingroup$ Could someone explain why the PSK - modulations (BPSK, QPSK) could be not used in the optic communication in satellite? We can; as in any other communication, you just need to stabilize the phase. So, that claim seems to be wrong. $\endgroup$
    – Marcus Müller
    Sep 16, 2021 at 8:57
  • $\begingroup$ What is a difference between FSK (BFSK) and PSK(BPSK) Completely independent question and should be asked separately. Also, both terms are researchable! $\endgroup$
    – Marcus Müller
    Sep 16, 2021 at 8:59
  • $\begingroup$ @MarcusMüller I have read the current reseach and device specifications. Most of them use OOK NRZ modulation and I havent seen any with PSk $\endgroup$
    – Adil.Kolenko
    Sep 16, 2021 at 10:42
  • $\begingroup$ but you say "why we couldn't". And we can: Do you mean "why commercial transceivers don't do this" (and please link to a few of them)? I'm trying to nail down exactly what your question is! (also, if the question is "why do commercial systems not do what is technically possible", then the usual answer is "no profit, sorry".) $\endgroup$
    – Marcus Müller
    Sep 16, 2021 at 11:19
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    $\begingroup$ @Adil.Kolenko Any modulation based on phase information is difficult to implement in an optical link, because photodiodes detect power, and hence lose all phase information. Lately, researchers have come up with workarounds to this problem and some PSK systems have become available. $\endgroup$
    – MBaz
    Sep 16, 2021 at 12:39

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