Converting 3 Logic Levels to 2 Logic Levels for Laser Driving Systems

[Chrisgali]

I need help with a mini communication project. I am trying to receive signals from RJ45 Ethernet (10 BASE-T), which comes in three logic levels (-2.5, 0, +2.5) and convert it into two logic levels so I can drive a laser on and off. Would anyone know of any IC's that can accept these signals to output 2 logic levels or vice versa (two levels --> three levels)?? Is there a specific part designed to do this?

Note: Someone said laser driving systems typically have some type of encoder/decoder that does this?

 

[berkeman]

You would typically use an Ethernet PHY receiver to convert the signals on the Ethernet cable to logic levels (0V to 3.3V typically). The voltages on the Ethernet twisted pair are transformer-coupled, so that's why they are generally shown as +/-3.5V or so.

https://i.stack.imgur.com/blsP8.png

Also, how fast is your laser OOK modulator? How fast of an Ethernet signal do you want to convert?