Research On Waveguide Mode Control For Mode-division-multiplexing System

Over the past decade, the new technology, new business emerging,information transmission broadband demand continues to grow rapidly, the existing fiber transmission resources are being rapidly consumed. At the same time, data services also increased at an annual rate of up to 300% of the explosive growth. The demand for information capacity has increased dramatically, and the optical fiber communication system and its network face great challenges.At present, the use of optical spectrum efficiency has reached a very high level. If in order to improve the transmission capacity, continue to improve the intensity of reuse and increase the order of the modulation format, will bring a lot of signal damage. Therefore, the need for a new way to take a fundamental solution to bandwidth demand contradictions.Mode-division-multiplexing is the use of different fibers in the same mode to transmit different information, which is equivalent to the optical fiber communication to add a new reuse dimension, it can greatly increase the transmission capacity of a single fiber,and the optical spectrum utilization have been greatly improved.Mode-division-multiplexing adds a new one-dimensional multiplexing scheme to optical fiber communication systems,and is one of the most promising methods for increasing the channel capacity of optical fiber communication. It has become a frontier and hot research topic in the field of optical communication . As the WDM system has greatly improved the capacity of fiber-optic communication systems,Mode-division-multiplexing has the potential to greatly improve the information capacity and frequency efficiency of optical fiber communication,which is expected to solve the current contradiction between supply and demand of bandwidth.In the optical fiber system, different modes of energy loss are different,resulting in energy imbalance between the pattern, this situation in the long-distance transmission optical network is particularly serious, and when the different modes of transmission are demultiplexed at the receiving end of the signal, the energy imbalance of the pattern brings great difficulties to the demultiplexing process, which is a difficult problem in signal recovery,especially in MIMO technology. The imbalance of energy between modes restricts the application of modulo-multiplexing technology in practice.Therefore, the model energy balance technology will become the key technology to promote the application of modulo-multiplexing technology in reality.Likewise, this issue is covered in this paper because of the mode-dependent loss associated with the mode dependence of the performance of the MDM system.In this paper, we focus on the mode selectivity equalization and selective mode conversion. The paper focuses on the generation condition of the mode-selective equalizer and the selective mode conversion device. Using Matlab and Rsoft simulation software is used to simulate the structure design of the two modes of control devices. Finally, the new waveguide mode equalizer and mode converter are obtained, and the flexible equalization mode equalization method is achieved. The low insertion loss Mode multiplexing method.