Reddit mentions of 0.3 Meter (1FT) Multimode Duplex Fiber Optic Cable (62.5/125) - LC to LC - Orange

https://www.amazon.com/gp/product/B00552PLMK/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

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Easiest option is just to get a pair of MM 1G fiber transceivers:

https://www.amazon.com/dp/B01MY5498F/ref=cm_sw_r_cp_awdb_t1_EYnZCb5X0QM6J

And some MM fiber:

https://www.amazon.com/gp/aw/d/B00552PLMK?psc=1&ref=ppx_pop_mob_b_asin_title#

I got 2 of each (transceivers come in pairs so I ordered 2 sets to aggregate, this of course is optional but mine was for my AP which also can aggregate so I figured why not) to connect my Xg16 to my us-8-150w.

Never had any issues and no warranty worries since they are actual Uniquiti transceivers.

Edit:

Also, technically you could use 10G transceivers (https://www.amazon.com/U-Fiber-Multi-Mode-SFP-10G/dp/B01N0XR1RL/ref=mp_s_a_1_4?keywords=ubiquiti+10g&qid=1556930057&s=gateway&sr=8-4#) on the xg16 as some people of mentioned, but I’m not sure why you would since they cost more than twice as much and won’t ever give you an advantage since in most normal situations if you are using 2 sfp+ connections that are close you would just use dac cables anyway.