Report 002 · Defense Tech
Fiber-optic drones really do defeat radio jamming. But "immune to jamming" and "immune to electronic warfare" are not the same claim, and the gap between them is exactly where the fighting is going.
If you've read anything about the drone war in Ukraine in the last year, you've met the word unjammable. It's attached to a specific weapon: the fiber-optic FPV drone, which trails a hair-thin glass thread behind it instead of talking to its pilot over radio. IEEE Spectrum describes the setup plainly: the drone can range "20 or more kilometers away from the controller, the hair-thin fiber floating behind them, providing an unjammable connection." A Ukrainian maker in the same piece puts it bluntly: there is no protection against them.
That's true. It's also the kind of true that gets rounded up into something false. I spent my Army career as a Counter-IED and Electronic Warfare Officer: the job was operating the equipment that denies an enemy the electromagnetic spectrum. So let me draw the line the marketing won't: fiber is immune to jamming. It is not immune to electronic warfare, and it is nowhere near invulnerable. Those are three different sentences.
A jammer is not a magic "drone off" switch. It does one narrow thing well: it floods a slice of the radio spectrum with noise so a receiver can't hear the signal it needs. Against a normal radio-controlled FPV drone, that means two links go down: the pilot's control channel and, usually, the satellite-navigation (GPS/GNSS) feed the drone uses to know where it is. Cut both and, as Spectrum describes it, the drone "will either crash or fly off randomly until its battery dies."
Now look at what a jammer is aimed at: a radio link and a navigation signal. A fiber-optic drone has neither in play. Its commands and video ride down a physical glass fiber, and it doesn't need GNSS to fly. There is no radio for the noise to drown out. Defense Express states it flatly: fiber FPV drones "are immune to EW." So the "unjammable" claim is real, but notice it's a claim about the jammer's envelope, not about the drone's survivability. A jammer touches the RF link and GNSS. It does not touch glass, and it cannot touch a camera making its own decisions onboard.
Move the fiber outside the jammer's envelope and it picks up a set of very physical problems: the kind an operator learns fast and a headline never mentions.
There's a second way to beat jamming that doesn't involve a wire at all, and it's the one I'd actually watch. Instead of protecting the link, you remove the need for it, at least at the end. The operator flies the drone toward a target, locks it with a camera, and hands the last few hundred meters to the machine. New footage from Ukraine shows exactly this: once the target is designated, "the drone autonomously flies toward the locked point, initiating a strike without further input from the operator." Bolt-on modules are already doing it in the field: one, called TFL-1, "provides autonomous terminal guidance for the final 400 to 500 meters" of the flight. Defense Express frames the whole approach for what it is: machine vision "attempting to counter electromagnetic suppression... offering autonomy."
Here's where I'll correct the framing that even the good coverage drifts into, because precision is the whole point of this publication. This is not a link-free drone. It's a link-free terminal phase. You still have to fly it into lock-on range, and on that leg it's an ordinary radio drone: jammable. Defense Express is explicit: "you still need to manually guide the drone to the place from where the machine can lock on target, making it vulnerable to jamming before the operator designates the target." The autonomy protects the last seconds, when jamming used to save the target. It does not protect the ingress.
And it isn't a clean win over the wire, either. Onboard targeting is a genuinely hard machine-vision problem: the Kyiv Independent notes it has been "often less reliable than a capable pilot and needing more expensive hardware," which is part of why Russia leaned so hard into fiber in the first place. So it's not "fiber dumb, AI smart." It's a trade space.
Put the two answers side by side and the slogan falls apart. Fiber gives you a guaranteed link and pays for it with range, weight, a fragile tether, and a wire that betrays your position. Machine vision drops the tether and pays for it with cost, reliability, and a still-jammable run-in. Neither is "unjammable" in the sense a reader hears the word: invulnerable. Both are answers to one narrow question: how do I keep control through the part of the flight where the enemy can take it from me?
That's the question electronic warfare has always been about, long before drones. The spectrum is contested; every choice to protect one link opens another seam. When you next see "unjammable," do the operator's translation: immune to radio jamming, on this leg, at this cost. That sentence is true, useful, and a lot harder to sell.
U.S. Army combat veteran (Counter-IED / Electronic Warfare), peer-reviewed researcher in microwave spectroscopy, and founder & CEO of Shroombiosis. Consults on laboratory operations, AI, and supplement formulation.