Eh? Typical min bend radius is like 10x diameter in static conditions, so for a 2mm fiber cable that'd be 20mm or ~0.8". That's not an issue at all with consumer usage, and if you're really worried is trivially solved by just building the thing up to the level of thickness Thunderbolt cables have already. That's why Corning for example advertised their old TB optical cables as "zero bend radius" [0], adding more polymer/armor around a fiber cable so that someone can do whatever with it and it naturally won't go out of spec isn't a big deal.
FWIW, anecdotally high performance copper doesn't like abnormal use either. 10g USB-C cables are cheap enough that I tried taking one and using a vice grip to actually really squash thing at an angle, and it didn't like that at all in terms of working reliably afterwards. I doubt DP, HDMI and the like would do better, and those are plenty thick too. It never comes up though in normal use. And when cables are cheap vs stupid pricey making a mistake no longer is such a big deal. If you use an $8 cable a bit too hard and it stops working, well grab another one out of the drawer. If your $70 cable breaks that's a touch worse.
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0: https://www.corning.com/microsites/coc/ocbc/Documents/CNT-00...
I’ve been involved in the replacement of two fibre optic cables at work, used for pulse oximetry in an MR scanner. It was very expensive, twice.
People force a bend and destroy them. It doesn’t matter what you tell people, they break them.
Of course, the real problem 95% of the time is really around the device not the technology the device uses. There is a misalignment of incentives on who can work on the device, whether standard parts are used, and whether the approved parts are the $2 type solution that will cost $800 in on site contractor fees to replace again or the $4 solution which actually stands a chance to being used. Once the device is bought nobody is going to be incented or allowed to do anything but fix it to status quo. It's one reason I had to get out of healthcare IT - it was more often the system getting in the way of what patients and nurses needed to do than the actual technology itself so solving things from a technology perspective felt like running on a treadmill and going nowhere.
Are these used for very long runs - as in a video source to a projector (via hdmi) hundreds of meters away, like in a stadium..?
Thank you!
If you want to go 15-30m--- using a video source from another part of your house, or to drive a projector in the middle of a classroom--- and you buy an "active cable", odds are it's fiber optic inside.
If you want to go hundreds of meters away, you'll get a purpose-built box that uses your own optical cables instead of a cable that hides the optical transceivers inside.
- long runs that are not that long. hdmi does not like long cables at all. even an overhead projector in a classroom requires super expensive cables (ever wondered why it's still mostly vga?)
- packing multiple displays in a single cable. fiber is so thin that with trunk cables you get a lot of strands in a single cable, capable of running a lot of displays
- just getting a really thin cable that can be run in existing conduits or hard to reach places
I did buy such a cable for home for the third reason, to run from the PC in the office to the TV in the living room. It runs on a bog standard OM3 MPO cable. The specific one I got comes from HeyOptics and their website already showcases a few usecases [1]. (not affiliated, just a great product that just works)
As for stadiums and more generally broadcast video, they're using SDI instead of HDMI. Those are indeed most of the time fiber, both for range and weight (think of the cameraman running along the terrain during a sport event, and their long tail of cables). When they use HDMI it's more in the control room.
[1]: https://www.heyoptics.net/products/8k-hdmi-mpo-optical-cable
(edit: fixed list formatting, I always forget this is not markdown)
HDMI and DisplayPort are good for a bit longer than Thunderbolt over copper, but not by all that much. HDMI 2.1 can only go to around 3m as well now.
So we're in a world where "long" is a mere 5 meters / 15 feet. This is why so many VR headsets are using fiber cables - it has to be long to enable the movement and logistics of connecting a PC to someone freestanding in a room, but modern video signals are just too hard to drive over copper at that not really that long distances.