fSONA Receives Patent for Innovative Compact Telescope Design
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New Design Dramatically Reduces Telescope Footprint for Free Space Communications, Astronomy, Laser Radar, Remote Sensing, Military and Microscopy Applications

Vancouver, Canada – March 30, 2004 - fSONA Communications, a leading provider of optical wireless networking equipment, today announced that the United States Patent and Trademark office has granted the company a patent for its innovative compact telescope design.

fSONA’s invention, U.S. Patent No. 6,667,831 covers a compact optical system described as a modified Gregorian telescope. The compact telescope is derived from a standard Gregorian system by flipping the secondary mirror over a folding mirror in the middle of the optical path between the primary and secondary mirrors. In this manner, the primary mirror is constructed with a concentric “double-curved” geometry. The result is a Compact Gregorian Telescope that can be as short as 1/7th the focal length of the system.

Although the Gregorian telescope was first developed in the 17th century, a Compact Gregorian Telescope was not possible until recently when techniques for producing diamond-turned mirrors were readily available. This diamond-turning process is what allows for the production of a “double-curved” mirror surface.

“The Compact Gregorian Telescope dramatically decreases the footprint for a Gregorian telescope but more importantly it eliminates the need for expensive and time-consuming alignments between two curved surfaces” comments Vladimir Draganov, fSONA’s Sr. Optical Engineer and the inventor of the Compact Gregorian Telescope. “An added bonus is that, because there is only one curved surface to machine, manufacturing costs are greatly reduced.” In addition, both reliability and response to temperature change is improved due to the accuracy of the diamond turning process.

fSONA’s SONAbeam product line has always provided the best link margins and availability in the industry due to the high-powered 1550nm lasers in each system. Recently, fSONA improved the link margins of their already powerful systems by switching from PIN to more sensitive APD detectors. The addition of the diamond-turned mirrors from the Compact Gregorian Telescope design adds a further layer of reliability to an already outstanding system.

Applications for the Compact Gregorian Telescope in addition to free space communications include astronomy, night vision, laser radar, remote sensing, military, space (telescopes), and microscopy. In addition to being incorporated into fSONA’s SONAbeam product line, a modified version of our telescope is currently in use by Lawrence Livermore National Laboratories for a variety of applications.

About Lawrence Livermore Labs
Founded in 1952, Lawrence Livermore National Laboratory is a national security laboratory, with a mission to ensure national security and apply science and technology to the important issues of our time. Lawrence Livermore National Laboratory is managed by the University of California for the U.S. Department of Energy's National Nuclear Security Administration.

About fSONA
fSONA Systems is recognized as the preferred provider of optical wireless solutions for government, enterprise and service provider markets around the globe. Leveraging leading edge advancements in 1550nm optical transmission, the SONAbeam™ family of systems, based on free-space-optics (FSO), use a globally unlicensed, wireless technology to provide speeds up to 2.5 Gbps over distances up to 7km. For more information visit or

Further Information
For more information about fSONA, SONAbeam or Free-Space Optical Wireless, please contact:


fSONA and SONAbeam® are trademarks of fSONA Networks. All other trademarks are properties of their respective companies.