Point to multi-point with fibre

[samsterccna]

We currently have a point to multi point connection ASA-->ISP-->Router's (IPsec is in use)but now we managed to get fiber connection's this way we can eliminate the need of the ISP, can someone tell me what device or network design should we implement without adding more devices if possible.

Thanks

[Leo Laohoo]

Spoke & hub

[fiberstorejames]

Point to Multipoint is the most popular approach for wireless communications that have a large number of nodes, end destinations or end users. 

This is the example from fiber optic communication field.

[samsterccna]

So basically i can connect the routers to a single ASA using a fiber splitter ?do you mean DWDM devices?