Abstract
With the rapid growth of people’s demand for communication speed and capacity, optical communication technology has developed vigorously with its advantages of high transmission rate, large capacity and low power consumption. In order to increase transmission capacity and bandwidth, multiple multiplexing technologies such as wavelength division multiplexing (WDM), time division multiplexing (TDM), polarization division multiplexing (PDM) have been widely studied. However, there is a capacity crisis in standard single-mode optical fibers. Mode division Multiplexing (MDM) technology is considered to be an effective way to solve the capacity crisis because it can keep the bandwidth of a single transceiver constant and effectively increase the total transmission capacity. Data exchange is an important function in optical communication system, which can effectively increase the flexibility of the network. However, the data exchange function in MDM system is rarely reported. In this paper, data exchange technologies in MDM networks are studied in detail, including OAM mode exchange based on optical devices and spatial light modulator (SLM), and TE mode exchange based on asymmetric directional coupler (ADC), micro-ring resonator (MRR) and Y-waveguides. The principles, advantages and disadvantages of each mode switching technology are analyzed and discussed in detail.
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