Encoding methods for fiber optical digital transmission?

Encoding methods for fiber optic digital transmission include Non-Return to Zero (NRZ), Return to Zero (RZ), and Manchester encoding. NRZ encodes bits as high or low signals without returning to a baseline, which can lead to synchronization issues over long distances. RZ uses pulses that return to zero within the bit interval, improving synchronization but requiring more bandwidth. Manchester encoding combines clock and data signals, ensuring better synchronization and reducing the likelihood of errors in high-speed data transmission.