It depend very much on your data speed and also the total cable length. The higher the speed the more it cost. If you use glass based type of cables. I would not recommend making them your self. But the fiber terminator is easy to obtain in many types. Tell us more about your requirements.
Best regards
The PLR135/T9 max pulse frequency is 16MHz, here is the datasheet: [https://www.mouser.com/datasheet/2/143/PLR135_T9_datasheet-28766.pdf], Relatively slow, but sufficient for my needs.
There's a lot of fiber optics on the market, no need to made it myself. I can buy it directly from the market.
only need know which type of them. oh, I will ask them on line...