At its core, a 1x9 optical transceiver is an electro-optical converter. Often overlooked in discussions dominated by the latest innovations, this robust. The working principle of optical modules is illustrated in the diagram shown in the Optical Module Working Principle Diagram. The transmitting interface inputs electrical signals of a certain bit rate, which are then processed by internal driver chips. Subsequently, the driver semiconductor laser. The 1x9 form factor dates back to the 1990s. The technology evolved to early generations of 1Gb/s Ethernet, 1Gb/s Fibre Channel and OC-48 optical transceivers and was then replaced by GBIC and subsequently SFP form. A 1×9 transceiver, also called a 1×9 fiber optic transceiver, is an optical component with a transmitter and receiver in the 1×9 single in-line (pin) package.