AES-3id optical converters multiplex and optically convert AES signals from up to 8 ports (16 audio channels) to allow them to be transmitted over long distances. Further, eight different types of TX (distinguished by emitted light wavelengths from 1471nm to 1611nm) use coarse wavelength division multiplexing (CWDM) to allow AES signals from up to 64 ports (128 audio channels) to be transmitted via a single fiber-optic cable.