On Wed, 9 Jan 2008, Gert Doering wrote:
What are "optical circulators"?
http://en.wikipedia.org/wiki/Optical_circulator"An optical circulator is a special fiber-optic component that can be used to separate optical powers that travel in opposite directions in one single optical fiber, analogous to the operation of an electronic circulator. An optical circulator is a three-port device that allows light to travel in only one direction—from port 1 to port 2, then from port 2 to port 3. This means that if some of the light emitted from port 2 is reflected back to the circulator, it is directed not back to port 1, but on to port 3. Circulators can also be used to achieve bi-directional transmission over a single fiber. Because of its high isolation of the input and reflected optical powers and its low insertion loss, optical circulators are widely used in advanced communication systems and fiber-optic sensor applications."
-- Mikael Abrahamsson email: [EMAIL PROTECTED]
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