Apart from GPON and EPON, there are other PON standards worth mentioning. BPON (Broadband Passive Optical Network) was the first-generation PON standard but has been superseded by GPON and EPON due to their superior speeds and capabilities. 10G-PON (also known as XG-PON) is the next-generation PON standard that offers even higher speeds and coexistence with existing GPON infrastructure.