<font size=2 face="sans-serif">Dear CMC,</font>
<br><font size=2 face="sans-serif"> thanks
to Bernie and Klaus-Juergen, please find below the response to the
above mentioned CMC action:</font>
<br>
<br><font size=3>-----</font>
<br><font size=2 face="sans-serif">In the context of Moon to Earth communication
employing also optical communication the following solutions are currently
under investigation:</font><font size=3> <br>
</font><font size=2 face="sans-serif"><br>
1. Optical Moon Direct to Earth</font><font size=3> </font><font size=2 face="sans-serif"><br>
For the Optical Moon Direct to Earth communication the CCSDS High Photon
Efficiency recommendation as envisaged for deep space communication could
be used, which is comprised of a 1550 nm downlink, a 1030 nm uplink, and
SCPPM modulation and coding. A 1550 nm uplink to the Moon is currently
not under consideration, but could be explored as an option.</font><font size=3>
<br>
</font><font size=2 face="sans-serif"><br>
2. Optical Moon to Earth Relay (then Ka-band from Earth Relay to Ground)</font><font size=3>
</font><font size=2 face="sans-serif"><br>
For Optical Moon to Earth Relay communication there is currently no consensus
in CCSDS, as it is linked to the High Data Rate recommendations where two
different proposals were made by NASA and ESA. </font>
<br><font size=2 face="sans-serif">ESA currently investigates the scale-up
of the EDRS solution for the Inter-Satellite Link, i.e. 1064 nm with homodyne
BPSK modulation, and the re-use of the Ka-band solution from Earth
Relay to Ground.</font><font size=3> <br>
</font><font size=2 face="sans-serif"><br>
In conclusion there is no clear recommendation yet from CCSDS SLS-OPT for
Moon to Earth optical communication, but agencies explore various solutions.</font><font size=3>
</font><font size=2 face="sans-serif"><br>
</font><font size=3>-----<br>
</font>
<br><font size=2 face="sans-serif">With this response SLS Area consider
the action closed.</font>
<br>
<br><font size=2 face="sans-serif">Best Regards,</font>
<br>
<br><font size=2 face="sans-serif">Gian Paolo Calzolari</font>
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