Optical SETI Map Conferences Map Illustrations Map Photo Galleries Map Observations Map Constructing Map
Search Engines Contents Complete Site Map Tech. Support Map Order Equip. Map OSETI Network

Search WWW Search www.coseti.org Search www.oseti.net Search www.photonstar.org Search www.opticalseti.org

colorbar.gif (4491 bytes)


Pulsed Laser Beacons & Interval Modulation



The diagram shows the idea of intense attention-getting pulsed laser beacon signals multiplexed with a weaker wideband data channel. (10.4 kbytes)


This diagram shows the basic idea behind the transmission and detection of pulsed laser beacons with imbedded wideband data.  The benefits of pulse position modulation (PPM) and pulse interval modulation (PIM) for SETI-type communication channels was first pointed out by Monte Ross in the 60's.

The COSETI Observatory is hoping to detect the expected powerful laser beacons.   According to this rationale and strategy, following up such detection with observations of the same star by the great telescopes of the world, should result in sufficient photons to detect the much weaker wideband data channel.


See 9907-001 for a later version of this illustration.

Copyright (c), 1994, The COSETI Observatory

Home Glossary
SPIE's OSETI I Conference SPIE's OSETI II Conference
SPIE's OSETI III Conference
The Columbus Optical SETI Observatory
Copyright , 1990-2006 Personal Web Site:
Last modified:  10/28/06
Contact Info