A Multiplexing technique operating in the time domain.

Time division multiplexing is a technique where several optical signals are combined, transmitted together, and separated again based on different arrival times. In an optical Fiber communications system, for example, interleaving pulse trains can carry different Data channels in a single fiber. The use of multiple channels allows increased overall data Transmission capacities without increasing the data rates of the single channels, or to transmit data of different Users simultaneously.

Time division multiplexing is the process of transmitting multiple signals concurrently over a single path of transmission. This allows for multiple types of data to be transmitted over a single fiber.

Lower speed signals are able to be combined into higher speed signals and then re-divided at the receiving end of the signal path.