AN649 Datasheet | Maxim Integrated

description of the electronic ponents required for optic/electric (O/E) conversion in SDH/SONET fiber optic transmission systems. petition among network providers enables the multimedia market to grow, and the introduction of new and improved products and services in the near future should strengthen the demand for increased transmission capacity. This need for more data throughput can be satisfied economically with fiber optic (FO) cables because the transmission capacity is potentially very high (versus that of copper wires). The physical nature of the fiber cable lets providers expand capacity by increasing the transmission bit rate or by introducing alternative transmission techniques, without the need for further upgrades or additional cable installations. These advantages have led many countries to build extensive fiber networks, and further expansion of these networks can be expected. To transmit optical data via fiber cables, signals must be converted from electrical to optical at the transmit end, and then converted back to electrical at the receive end. These necessary conversions are handled by receiver/transmitter units that contain electronic devices along with the optical ponents. FO transceivers The widely used Time Division Multiplex (TDM) transmission technique now enables bit rates up to 10Gbps and is well established in modern transport systems. Today's high-speed fiber optic transmission systems offer the following standard bit rates: .maxim-ic./an649 Page 1 of 11 New techniques such as Wavelength Division Multiplexing (WDM) further increase the transmission capacity by sending numerous time-multiplexed data streams over one fiber, using a different wavelength for each data stream. Electronic ponents in a WDM receiver and transmitter (pared with those in a TDM system) differ according to the behavior of the optical sources and line amplifiers in the WDM transport system. The following section describes the performance required for receivers...