Can optical fibers transmit in both directions simultaneously? Both single mode fibers and multi mode? What about if they we choose non-interfering wavelengths?
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Theoretically such concepts are good to be imagined, and infact it is possible to make one that can communicate bidirectionally,but when the its a matter reliability it is preferable to have a duplex with two fibers. |
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Apparently that is possible and there is at least one commercial product. I haven't seen them used in practice, though. |
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Light travelling in both directions through a fiber is no problem. Paths of in- and outgoing light can be seperated/combined by beam splitters. Interference happens only if two different beams hit the detector. Then both beams may interfere (coherence required). In fiberoptic gyroscopes this effect (Sagnac effect) is even wanted. |
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