The inner workings of an sfp port and a mistake that may have cost me 2 days of scratching my head

The simple question here is Is 1gbs sfp(non infiniband) just ethernet over fiber

The long part When i say is it just ethernet over fiber i mean does a 1gbs rj45 port ethernet use the same chip as a 1gbs sfp port. Does the sfp transfer just have the wires connected in thIs configuration Rj-45 sfp TD_D1+ > TD+ TX_D1- > TD- RX_D1+ > RD+ RX_D1- > RD-

Or does an sfp traciver use a diffrent protocal to comunicat between the host device and the tranciver If it does use a diffrent protocal does anyone know what it is and would you be so kind as to let me know it would be thoroughly appreciated because im trying to find a chip set that can interface with an sfp module and the lack of results is bringing me to the conclusion im looking for the wrong thing