the drone is still visible to radar, lidar, and such, and can still be blinded. additionally the cable can be a source of failure, too. but it works well with short range drones, yes. you won't see anybody using fiber communication along a front line for long range communication, because it's simply too inconvenient and vulnerable. locally sure, and further in the rear, but less so where there is a real risk of enemy attack. largely because wireless works just fine. satellite works, digital radio works. neither of which is very vulnerable to jamming or intercept. and you can even use cell-phone tower technology.
Germany