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<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span lang="EN-GB" style="font-size:10.0pt;font-family:Arial;color:navy">Dear Enrico,<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span lang="EN-GB" style="font-size:10.0pt;font-family:Arial;color:navy"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span lang="EN-GB" style="font-size:10.0pt;font-family:Arial;color:navy">Thanks for your reply.<o:p></o:p></span></font></p>
<p class="MsoNormal" style="margin-left:18.0pt;text-indent:-18.0pt;mso-list:l1 level1 lfo3">
<![if !supportLists]><font size="2" color="navy" face="Arial"><span lang="EN-GB" style="font-size:10.0pt;
font-family:Arial;color:navy"><span style="mso-list:Ignore">1)<font size="1" face="Times New Roman"><span style="font:7.0pt "Times New Roman"">
</span></font></span></span></font><![endif]><span dir="LTR"><font size="2" color="navy" face="Arial"><span lang="EN-GB" style="font-size:10.0pt;font-family:
Arial;color:navy">You write: „
</span></font></span><font size="2" face="sans-serif"><span lang="EN-GB" style="font-size:10.0pt;font-family:sans-serif">I do not want to challenge your reasons for proposing the use of ...</span></font><font size="2" color="navy" face="Arial"><span lang="EN-GB" style="font-size:10.0pt;
font-family:Arial;color:navy">“.
Well, knowing that you are “</span></font><font size="2" face="sans-serif"><span lang="EN-GB" style="font-size:10.0pt;font-family:
sans-serif">un esperto di link budget</span></font><font size="2" color="navy" face="Arial"><span lang="EN-GB" style="font-size:10.0pt;font-family:Arial;
color:navy">”,
I am a bit disappointed.<o:p></o:p></span></font></p>
<p class="MsoNormal" style="margin-left:18.0pt;text-indent:-18.0pt;mso-list:l1 level1 lfo3">
<![if !supportLists]><font size="2" color="navy" face="Arial"><span lang="EN-GB" style="font-size:10.0pt;
font-family:Arial;color:navy"><span style="mso-list:Ignore">2)<font size="1" face="Times New Roman"><span style="font:7.0pt "Times New Roman"">
</span></font></span></span></font><![endif]><span dir="LTR"><font size="2" color="navy" face="Arial"><span lang="EN-GB" style="font-size:10.0pt;font-family:
Arial;color:navy">You write: “</span></font></span><font size="2" face="sans-serif"><span lang="EN-GB" style="font-size:10.0pt;font-family:sans-serif">it
would not be a good idea if CCSDS were not to use the same terminology of ITU</span></font><font size="2" color="navy" face="Arial"><span lang="EN-GB" style="font-size:10.0pt;
font-family:Arial;color:navy">”. I understand. So let me put it this way:<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span lang="EN-GB" style="font-size:10.0pt;font-family:Arial;color:navy">We do not modify the ITU parameters and we do not change their terminology. But **in addition to** the ITU parameters, we
introduce a simple concept which at the moment I call “Rx-directivity” because I assume that the term “directivity” is defined so far only for a transmitting (radiating) antenna. This new parameter can be called differently if a more appropriate name is found.
<o:p></o:p></span></font></p>
<p class="MsoNormal" style="margin-left:18.0pt;text-indent:-18.0pt;mso-list:l1 level1 lfo3">
<![if !supportLists]><font size="2" color="navy" face="Arial"><span lang="EN-GB" style="font-size:10.0pt;
font-family:Arial;color:navy"><span style="mso-list:Ignore">3)<font size="1" face="Times New Roman"><span style="font:7.0pt "Times New Roman"">
</span></font></span></span></font><![endif]><span dir="LTR"><font size="2" color="navy" face="Arial"><span lang="EN-GB" style="font-size:10.0pt;font-family:
Arial;color:navy">About the ITU references:<o:p></o:p></span></font></span></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span lang="EN-GB" style="font-size:10.0pt;font-family:Arial;color:navy">I suggest to add the following item on the agenda of the OCM meeting (May 18<sup>th</sup>, Wednesday):<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span lang="EN-GB" style="font-size:10.0pt;font-family:Arial;color:navy">- discuss the relevance of ITU recommendations on optical space comms.<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span lang="EN-GB" style="font-size:10.0pt;font-family:Arial;color:navy"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span lang="EN-GB" style="font-size:10.0pt;font-family:Arial;color:navy">Regards,<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span lang="EN-GB" style="font-size:10.0pt;font-family:Arial;color:navy"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span lang="EN-GB" style="font-size:10.0pt;font-family:Arial;color:navy">Nicolas<o:p></o:p></span></font></p>
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<p class="MsoNormal"><b><font size="2" face="Tahoma"><span lang="EN-US" style="font-size:10.0pt;font-family:Tahoma;font-weight:bold">From:</span></font></b><font size="2" face="Tahoma"><span lang="EN-US" style="font-size:10.0pt;font-family:Tahoma"> Enrico.Vassallo@esa.int
[mailto:Enrico.Vassallo@esa.int] <br>
<b><span style="font-weight:bold">Sent:</span></b> Mittwoch, 6. April 2011 11:26<br>
<b><span style="font-weight:bold">To:</span></b> <st1:PersonName w:st="on">Perlot, Nicolas</st1:PersonName><br>
<b><span style="font-weight:bold">Cc:</span></b> <st1:PersonName w:st="on">sls-com@mailman.ccsds.org</st1:PersonName>; Gian.Paolo.Calzolari@esa.int<br>
<b><span style="font-weight:bold">Subject:</span></b> Fw: [Sls-ocm] Concept book + Link budget convention</span></font><span lang="EN-US"><o:p></o:p></span></p>
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<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:
12.0pt"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:
12.0pt"><br>
</span></font><font size="2" face="sans-serif"><span style="font-size:10.0pt;
font-family:sans-serif">Dear Nicolas,</span></font>
<br>
<br>
<font size="2" face="sans-serif"><span style="font-size:10.0pt;font-family:sans-serif">I do not want to challenge your reasons for proposing the use of directivity instead of gain, and the relevant link terminology.</span></font>
<br>
<br>
<font size="2" face="sans-serif"><span style="font-size:10.0pt;font-family:sans-serif">However, I would like to point out that other bodies like the ITU do use gain and free-space loss also for optical links. In my opinion, it would not be a good idea if CCSDS
were not to use the same terminology of ITU. We have always tried to be consistent with ITU in the RFM WG.</span></font>
<br>
<br>
<font size="2" face="sans-serif"><span style="font-size:10.0pt;font-family:sans-serif">Please check recommendations ITU-R SA.1742 and SA.1805 on 238 THz and 354/366 THz communications. For ITU copyright reasons, I cannot forward them. I trust you can get them
from DLR frequency management office.</span></font> <br>
<br>
<font size="2" face="sans-serif"><span style="font-size:10.0pt;font-family:sans-serif">Regards, Enrico</span></font>
<br>
<font size="1" color="purple" face="sans-serif"><span style="font-size:7.5pt;
font-family:sans-serif;color:purple">----- Forwarded by Enrico Vassallo/esoc/ESA on 06/04/2011 11:16 -----</span></font>
<o:p></o:p></p>
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<p class="MsoNormal"><font size="1" color="#5f5f5f" face="sans-serif"><span style="font-size:7.5pt;font-family:sans-serif;color:#5F5F5F">From:</span></font>
<o:p></o:p></p>
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<p class="MsoNormal"><font size="1" face="sans-serif"><span style="font-size:7.5pt;
font-family:sans-serif">Gian Paolo Calzolari/esoc/ESA</span></font>
<o:p></o:p></p>
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<p class="MsoNormal"><font size="1" color="#5f5f5f" face="sans-serif"><span style="font-size:7.5pt;font-family:sans-serif;color:#5F5F5F">To:</span></font>
<o:p></o:p></p>
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<p class="MsoNormal"><font size="1" face="sans-serif"><span style="font-size:7.5pt;
font-family:sans-serif">Enrico Vassallo/esoc/ESA@ESA</span></font>
<o:p></o:p></p>
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<p class="MsoNormal"><font size="1" color="#5f5f5f" face="sans-serif"><span style="font-size:7.5pt;font-family:sans-serif;color:#5F5F5F">Date:</span></font>
<o:p></o:p></p>
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<p class="MsoNormal"><font size="1" face="sans-serif"><span style="font-size:7.5pt;
font-family:sans-serif">28/03/2011 14:52</span></font>
<o:p></o:p></p>
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<p class="MsoNormal"><font size="1" color="#5f5f5f" face="sans-serif"><span style="font-size:7.5pt;font-family:sans-serif;color:#5F5F5F">Subject:</span></font>
<o:p></o:p></p>
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<p class="MsoNormal"><font size="1" face="sans-serif"><span style="font-size:7.5pt;
font-family:sans-serif">Fw: [Sls-ocm] Concept book + Link budget convention</span></font><o:p></o:p></p>
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<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:
12.0pt"><o:p> </o:p></span></font></p>
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<hr size="2" width="100%" noshade="" color="gray" align="center">
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<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:
12.0pt"><br>
<br>
</span></font><font size="2" face="sans-serif"><span style="font-size:10.0pt;
font-family:sans-serif">per te che sei un esperto di link budget</span></font>
<br>
<br>
<br>
<font size="1" color="purple" face="sans-serif"><span style="font-size:7.5pt;
font-family:sans-serif;color:purple">----- Forwarded by Gian Paolo Calzolari/esoc/ESA on 28-03-2011 14:51 -----</span></font>
<o:p></o:p></p>
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<p class="MsoNormal"><font size="1" color="#5f5f5f" face="sans-serif"><span style="font-size:7.5pt;font-family:sans-serif;color:#5F5F5F">From:</span></font>
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<p class="MsoNormal"><font size="1" face="sans-serif"><span style="font-size:7.5pt;
font-family:sans-serif"><Nicolas.Perlot@dlr.de></span></font>
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<p class="MsoNormal"><font size="1" color="#5f5f5f" face="sans-serif"><span style="font-size:7.5pt;font-family:sans-serif;color:#5F5F5F">To:</span></font>
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<p class="MsoNormal"><font size="1" face="sans-serif"><span style="font-size:7.5pt;
font-family:sans-serif"><<st1:PersonName w:st="on">sls-com@mailman.ccsds.org</st1:PersonName>></span></font>
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<p class="MsoNormal"><font size="1" color="#5f5f5f" face="sans-serif"><span style="font-size:7.5pt;font-family:sans-serif;color:#5F5F5F">Date:</span></font>
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<p class="MsoNormal"><font size="1" face="sans-serif"><span style="font-size:7.5pt;
font-family:sans-serif">27-03-2011 22:11</span></font>
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<p class="MsoNormal"><font size="1" color="#5f5f5f" face="sans-serif"><span style="font-size:7.5pt;font-family:sans-serif;color:#5F5F5F">Subject:</span></font>
<o:p></o:p></p>
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<p class="MsoNormal"><font size="1" face="sans-serif"><span style="font-size:7.5pt;
font-family:sans-serif">[Sls-ocm] Concept book + Link budget convention</span></font>
<o:p></o:p></p>
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<p class="MsoNormal"><font size="1" color="#5f5f5f" face="sans-serif"><span style="font-size:7.5pt;font-family:sans-serif;color:#5F5F5F">Sent by:</span></font>
<o:p></o:p></p>
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<p class="MsoNormal"><font size="1" face="sans-serif"><span style="font-size:7.5pt;
font-family:sans-serif">sls-com-bounces@mailman.ccsds.org</span></font><o:p></o:p></p>
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<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:
12.0pt"><o:p> </o:p></span></font></p>
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<hr size="2" width="100%" noshade="" color="gray" align="center">
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<br>
<br>
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</span></font><font size="2" color="navy" face="Arial"><span style="font-size:10.0pt;
font-family:Arial;color:navy">Dear Lasercom People,</span></font>
<br>
<font size="2" color="navy" face="Arial"><span style="font-size:10.0pt;font-family:
Arial;color:navy"> </span></font>
<br>
<font size="2" color="navy" face="Arial"><span style="font-size:10.0pt;font-family:
Arial;color:navy">1) Regarding the last version of our “concept book” that I provided in February, I did not receive the feedback that I had wished from ESA, NASA, CNES. However
I received some comments, so I uploaded a new version on CWE with the proposed changes highlighted in yellow:</span></font><u><font size="2" color="blue" face="Arial"><span style="font-size:10.0pt;font-family:Arial;
color:blue"><br>
</span></font></u><a href="http://cwe.ccsds.org/sls/docs/SLS-OCM/Draft%20Documents/OCM_ConceptBook_Draft_20110325.doc" target="_blank"><font size="2" face="Arial"><span style="font-size:10.0pt;
font-family:Arial">http://cwe.ccsds.org/sls/docs/SLS-OCM/Draft%20Documents/OCM_ConceptBook_Draft_20110325.doc</span></font></a><font size="2" color="navy" face="Arial"><span style="font-size:10.0pt;font-family:Arial;
color:navy"><br>
<br>
2) I’d like to propose a convention for link budget calculation/display in our field of free-space optics. Please read the attached document (3 pages), be open-minded and let me know what you think.
</span></font><br>
<font color="navy"><span style="color:navy"><br>
Regards,<br>
<br>
Nicolas Perlot</span></font> <br>
<font color="navy"><span style="color:navy">Chair of SIG OCM</span></font> <br>
<font color="navy"><span style="color:navy"> </span></font> <br>
<font size="2" face="Tahoma"><span style="font-size:10.0pt;font-family:Tahoma">_____________________________________________<b><span style="font-weight:bold"><br>
From:</span></b> <st1:PersonName w:st="on">Perlot, Nicolas</st1:PersonName> <b><span style="font-weight:bold"><br>
Sent:</span></b> Dienstag, 15. Februar 2011 13:52<b><span style="font-weight:
bold"><br>
To:</span></b> '<st1:PersonName w:st="on">sls-com@mailman.ccsds.org</st1:PersonName>'<b><span style="font-weight:bold"><br>
Subject:</span></b> Spring meeting in Berlin and Inputs for Concept Book</span></font>
<br>
<br>
<font size="2"><span style="font-size:10.0pt">Dear Lasercom people,</span></font>
<br>
<o:p></o:p></p>
<ul type="disc">
<li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
mso-list:l0 level1 lfo1">
<font size="2" face="Times New Roman"><span style="font-size:10.0pt">CCSDS Spring meeting in Berlin is approaching (May 16</span></font><sup><font size="1"><span style="font-size:7.5pt">th</span></font></sup><font size="2"><span style="font-size:10.0pt">– 20</span></font><sup><font size="1"><span style="font-size:7.5pt">th</span></font></sup><font size="2"><span style="font-size:10.0pt">).
So far, limited info is available:</span></font><font size="2" face="Arial"><span style="font-size:10.0pt;font-family:Arial">
</span></font><br>
<a href="http://public.ccsds.org/meetings/DispForm.aspx?ID=101" target="_blank"><font size="2"><span style="font-size:10.0pt">http://public.ccsds.org/meetings/DispForm.aspx?ID=101</span></font></a>
<br>
<o:p></o:p></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
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<font size="2" face="Times New Roman"><span style="font-size:10.0pt">About our Concept (White) Book:</span></font><font size="2" face="Arial"><span style="font-size:10.0pt;font-family:Arial">
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<font size="2" face="Times New Roman"><span style="font-size:10.0pt">A new version of our Concept Paper is available at
</span></font><a href="http://cwe.ccsds.org/sls/docs/SLS-OCM/Draft%20Documents/OCM_ConceptBook_Draft_20110211.doc" target="_blank"><font size="2"><span style="font-size:10.0pt">http://cwe.ccsds.org/sls/docs/SLS-OCM/Draft%20Documents/OCM_ConceptBook_Draft_20110211.doc</span></font></a><font size="2" face="Arial"><span style="font-size:10.0pt;font-family:Arial">
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<font size="2"><span style="font-size:10.0pt">Changes were made according to point 7)c. of the last-meeting minutes. Also, propositions were made according to point 7)e. on the following sections:</span></font>
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<font size="2"><span style="font-size:10.0pt">§ 3.3. Inappropriate technical solutions</span></font>
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<font size="2"><span style="font-size:10.0pt">§ 3.4. Possible working areas within space laser communications</span></font>
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<font size="2" face="Times New Roman"><span style="font-size:10.0pt">So far, I have received no inputs from ESA, NASA or CNES. In addition to the new sections §3.3 and §3.4 where suggestions would be appreciated,
<b><u><span style="font-weight:bold">several sections have been identified where agencies shall provide their views. Please return the document with your respective inputs by March 18</span></u></b></span></font><b><u><sup><font size="1"><span style="font-size:7.5pt;font-weight:bold">th</span></font></sup></u></b><b><u><font size="2"><span style="font-size:10.0pt;font-weight:bold">
(one month time)</span></font></u></b><font size="2"><span style="font-size:10.0pt">:</span></font><font size="2" face="Arial"><span style="font-size:10.0pt;font-family:Arial">
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<font size="2" face="Times New Roman"><span style="font-size:10.0pt">NASA: pls, review and complete</span></font><font size="2" face="Arial"><span style="font-size:10.0pt;font-family:Arial">
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<font size="2"><span style="font-size:10.0pt">§ 4.2.2</span></font> <br>
<font size="2"><span style="font-size:10.0pt">§ 4.3.1</span></font> <br>
<font size="2"><span style="font-size:10.0pt">§ 4.3.2</span></font> <br>
<font size="2"><span style="font-size:10.0pt">§ 4.3.3</span></font> <o:p></o:p></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
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<font size="2" face="Times New Roman"><span style="font-size:10.0pt">ESA: pls, review and complete</span></font><font size="2" face="Arial"><span style="font-size:10.0pt;font-family:Arial">
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<font size="2"><span style="font-size:10.0pt">§ 4.2.1.1</span></font> <br>
<font size="2"><span style="font-size:10.0pt">§ 4.2.1.2</span></font> <br>
<font size="2"><span style="font-size:10.0pt">§ 4.2.1.4</span></font> <br>
<font size="2"><span style="font-size:10.0pt">§ 4.3.1</span></font> <br>
<font size="2"><span style="font-size:10.0pt">§ 4.3.2</span></font> <br>
<font size="2"><span style="font-size:10.0pt">§ 4.3.4</span></font> <o:p></o:p></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
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<font size="2" face="Times New Roman"><span style="font-size:10.0pt">CNES: pls, review and complete</span></font><font size="2" face="Arial"><span style="font-size:10.0pt;font-family:Arial">
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<font size="2"><span style="font-size:10.0pt">§ 4.2.3.1</span></font> <br>
<font size="2"><span style="font-size:10.0pt">§ 4.2.3.2</span></font> <br>
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<font size="2" face="Times New Roman"><span style="font-size:10.0pt">I also recall the action items on NASA/JPL from our Spring 2011 meeting:</span></font><font size="2" face="Arial"><span style="font-size:10.0pt;font-family:Arial">
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<font size="2" face="Times New Roman"><span style="font-size:10.0pt">Describe figures and tables in §7.4 and §7.5 of the Concept Book.</span></font><font size="2" face="Arial"><span style="font-size:10.0pt;font-family:Arial">
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<font size="2"><span style="font-size:10.0pt">Best regards,</span></font> <br>
<font size="2"><span style="font-size:10.0pt"> </span></font> <br>
<font size="2"><span style="font-size:10.0pt">Nicolas Perlot</span></font> <br>
<font size="2"><span style="font-size:10.0pt"> </span></font> <br>
<font size="2"><span style="font-size:10.0pt">-- </span></font><br>
<font size="2"><span style="font-size:10.0pt">Nicolas Perlot, Ph.D.</span></font>
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<font size="2"><span style="font-size:10.0pt">Digital Networks Section,</span></font>
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<font size="2"><span style="font-size:10.0pt">Optical Communications Group</span></font>
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<font size="2"><span style="font-size:10.0pt"> </span></font> <br>
<font size="2"><span style="font-size:10.0pt">German Aerospace Center (DLR) phone: ++49/8153/281836</span></font>
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<font size="2"><span style="font-size:10.0pt">Institute of Communications and Navigation fax: ++49/8153/282844</span></font>
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<font size="2"><span style="font-size:10.0pt">Oberpfaffenhofen, P.O. Box 11 16 email:
</span></font><a href="mailto:nicolas.perlot@dlr.de" target="_blank"><font size="2"><span style="font-size:10.0pt">nicolas.perlot@dlr.de</span></font></a>
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<font size="2"><span style="font-size:10.0pt">82234 Wessling, Germany
</span></font><a href="http://www.dlr.de/KN/KN-DN/" target="_blank"><font size="2"><span style="font-size:10.0pt">http://www.dlr.de/KN/KN-DN/</span></font></a><font size="2"><span style="font-size:10.0pt">
</span></font><br>
<font size="2"><span style="font-size:10.0pt"> </span></font> <br>
<font size="2"><span style="font-size:10.0pt"> </span></font> <br>
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