Multiplexing (MUX multiple line conversations) over a single fibre strand has been done since the very first fibre optic cable was ever laid.
I have only just learnt myself that there are different simultaneous light frequencies(Laser diodes) that can do bidirectional light wave transmissions over a single fibre.
I wonder how this effects the fibre optic relay nodes and light wave decay wave reshaping? Does it introduce harmonics into the light wave field down the fibre itself. Is there a greater error correction in the actual wave shaping after amplifier node re-transmission?
Interesting....
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The communication over a single strand of fiber is achieved by separating the transmission wavelength of the two devices as depicted in Figure 2: 1000BASE-BX10-D transmits a 1490-nm channel and receives a 1310-nm signal, whereas 1000BASE-BX10-U transmits at a 1310-nm wavelength and receives a 1490-nm signal. As shown, the presence of a wavelength-division multiplexing (WDM) splitter integrated into the SFP to split the 1310-nm and 1490-nm light paths.
Figure 4. Bidirectional Transmission of a Single Strand of SMF
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