Fiber Optics in Fallout 76 are the component you want to heavily grind for when you’re looking to craft the high-end more so END game focused tech and weaponry. Fiber Optics are 100% needed in the crafting of most of the better weaponry and armor mods, and can drastically help you craft better gear to fight harder enemies. It’s also a key material in crafting some of the more technology focused structures for your CAMP!
That being said, you can find Fiber Optics in a couple of different items when you break them down, mostly in labs or robot filled areas, as they will carry the components on themselves. The items that contain Fiber Optics are:
Biometric Scanners
Flight Data Recorders
High Powered Microscopes
Microscopes
These items aren’t super hard to come across, and there are several locations around the map where they will readily spawn. You also need to remember that Fog Crawlers WILL drop these for every kill, typically in a bundle of 5 or so (if you’re lucky).
You want to search each and every “high-tech” facility, as that’s where you will more than likely find a lot of these objects. To get you started, here are a couple areas where you can farm these items to break them down into Fiber Optics:
Fort Defiance
Make sure to check the top floor with the Brotherhood technology
Beckley
Town filled with robots, sometimes dropping Biometric Scanners. Microscopes can also be found here
ATLAS Observatory
Robot filled center with lots of rooms with microscopes
National Radio Astronomy Research Center
Lots of rooms with microscopes
Robco Research Center
Another Laboratory filled with robots and microscopes