The Tellabs ONT 611 is a BPON ONT and Verizon will not provision that higher than 75Mbps/35Mbps. To get something higher Verizon would need to have GPON available at your Fiber distribution hub, and you would need to get a new ONT on top of an Ethernet connection.
It wouldn't hurt to call and ask Verizon if it's possible for them to get you more in some way, shape or form.