there are limitations due to physics and also fiber type. A multimode fiber will not allow you to achieve terabits because of the inherent dispersion (among other things).
With a single mode fibre the underlying physics for transportation is different allowing for much higher speeds.
The carrier frequency of light is in the hundred terahertz range so terabits would be the maximum range expected. Dampening i.e. absorption because of different physical effects like phonons, frequency dependant dispersion will give you an upper limit. Another limiting factor is the signal to noise ratio required by receivers.
Bottom line: as the posting above already stated, in most cases today the terminating equipment is the limting factor.
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