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this post was submitted on 14 Jan 2024
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Japan's current fiber-optic commercial internet connections use optical fiber transmission windows known as L and C multi-core fiber (MCF) bands to transport data long distances at record speeds. Meanwhile we (USA) have fiber back to copper and Cat3 for the last few hundred feet in most cities at best making the entire idea into a bottle neck.
There are a lot of very good reasons to switch back to copper for the last portion of a run. I highly doubt that consumer internet in Japan is terminating fiber directly into peoples' computers. Fiber is a lot more expensive both for the line, to run it, more prone to breakage, the network cards are more expensive, etc. It's really not needed for most purposes.
Also no one uses cat3 for data and it can't be run for 'hundreds of feet'. And LC fiber IS used in the US - that's a kind of connector not the kind of fiber.
You run fiber to the home and gigabit ethernet or whatever internally in the premises. All your other complaints re: cost and etc aren't really an issue for last mile consumer grade fiber.
I have seen installers run a fiber drop cable across from a power pole, bring it down an outside wall , then staple it to joists under a house, cleave off the end and stick a mechanical splice on it, bang it in the power meter, all good, plug it in the fiber modem, good to go in less than 20 minutes. All this stuff uses standard components and technology that's been available for 10+ years now.
It's probably the standard "last mile" half assed solution where they decide to use existing phone lines and VDSL from a box down the street instead of biting the bullet and running fiber.
This is how it works in the UK too. I've got Fibre To The Premises (FTTP), and the installation was pretty much exactly as you described.