First, don't get too excited. Many of these LCOs will try to trick you.
Ask them directly, if you're allowed to use your own
GPON ONT. If they will lie to you about incompatible OLT. Ask them the brand of their OLTs. If they are using
Syrotech OLT, it is 100% compatible with
TP-Link ONT because both BSNL exchange and LCO in Meghalaya are using Syrotech OLTs and they are working fine with my TP-Link ONT.
I suggest you buy the TP-Link OLT I'm using due to manufacturing quality reasons + stable firmware. Simply put it in bridge mode then use your own
router. You can buy whatever router you want with bridge mode.
Edit:
If you want simple ONT: Buy this:
TX-6610 | 1-Port Gigabit GPON Terminal | TP-Link Service Provider
Don't worry about sensitivity, this is Optical Module C+, it's perfect for India's weak Fibre Optics signal.
GPON stands for ‘
Gigabit Passive Optical Network’. GPON is one of the key technologies that are being used in fiber-based (FTTx) access networks, including fiber to the home (FTTH), fiber to the
business (FTTB), fiber to the curb (FTTC), etc. …
www.multicominc.com