Two Channel SDM Communication System Simultaneously Operating at 10Gb/s Using C-band Transceivers
Increasing the bandwidth of optical fiber communications to cope with high-speed network traffic is an important goal for the communications industry. Therefore, optical communication is growing at a very rapid pace, including the multiplexing technology. Spatial domain multiplexing (SDM), also known as Space division multiplexing, is a Multi-Input Multi-Output (MIMO) architecture that can increase the data carrying capacity of optical fibers by multiple folds. SDM allows multiple channels of same wavelength to be transmitted in parallel over standard multi-mode fibers, where each SDM channel follows a different helical trajectory while traversing the length of the fiber that lead to unique concentric donut-shaped rings at the output. These independent rings do not interfere with each other. The SDM system is similar to any optical communication system but requires two additional components, the spatial multiplexer and de-multiplexer also known as the Beam Combiner Module (BCM) and the Beam Separator Module (BSM) which are placed at the input and output ends of the system. Therefore, the design of BCM and BSM affect the performance of SDM systems. The successful operation of a two-channel SDM system for LAN applications, with associated BCM and BSM is presented. This two channel system operate at 10 Gb/s using C-band transceivers and allows spatial reuse of optical frequencies.