Although not DisplayPort, I also use an optical fiber HDMI cable -- and it works wonderfully well for sending HDMI signals long distances.
These babies used to cost $300-$500 and I'm glad prices are falling on fiber-optic video cables, and I snapped one up for well under $100. Some of the optical fiber HDMI cables even fell to under $50 during Amazon sales. Optical-fiber DisplayPort is more expensive than optical-fiber HDMI cables at the moment though. There's also optical-fiber USB3 cables too (rarer, like the Oculus Link cable).
Today, optical HDMI options have become very common on Amazon recently; so common that
AmazonBasics now sells optical HDMI for less than USD $50 for 30 foot to about USD $120 for 300-foot. Yep, 300 foot HDMI that keeps a 4K signal (4K60 or 1080p240).
They are great for sending 4K and 8K video signals across a big home theater room over long thin cables. I use a 10 meter (~33ft) optical fiber HDMI cable to watch all my streaming content on a 4K projector beaming onto a 120" screen!
I did not buy one for EMI immunity -- but for sending a video signal flawlessly for longer distances. At these distances, no easy way to do that for today's bandwidths without an optical fiber replacing the data wires of HDMI/DP.
Video of my optical HDMI versus non-optical HDMI cable:
twitter.com/BlurBusters/status/1276355127599865861
I used to call the old HDMI cable the "Aconada" because the cable was almost as thick as a snake. The optical fiber HDMI cable is positively slender.
But yes, they are more EMI resistant. They are definitely indeed much more immune to EMI / EMF / EMP / any form of interference than non-fiber-optic HDMI/DisplayPort cables. Video standards and cables don't normally use retroactive error correction so going optical generally won't help latency (unless you consider intermittently frozen images -- caused by a bad cable connection -- as a roundabout form of "lag" because you're waiting for the video to unfreeze/resume. Some displays "hold" the last good refresh cycle until the next error-free refresh cycle delivers...).
Regardless, well-made optical video cables will generally have fewer glitches with longer cable runs where copper fails -- or in high-EMI environments (like living mere meters away from high voltage power transmission cables).
Make sure to stick to high rated ones (4.5 stars on Amazon). The cable connectors are the parts that contain the expensive fiber electronics that can break if the connector casings / crimp protectors aren't well built; about 90% of the cost of a fiber optic video cable is the tiny advanced electronics crammed inside the cable's plug casings. Which converts non-optical to optical then back to non-optical (at the ends) to connect into existing non-optical HDMI and DP ports. So be gentle with the valuable connectors of optical video cables;
