> Right. But why would you use two fibers when BIDIs exist?  Is there some 
> benefit?
  Inventory management and sparing becomes a bit more complicated with BiDi 
optics as they come in pairs. There is also some variation in wavelengths used, 
further potentially complicating things.

  Of course, if tunable BiDi optics became a thing all problems would be solved.


Jared

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