The speed of data transmission over optical fiber was increased by 24 times
Welcome to the pages of the blog iCover . At the Polytechnic University of Hong Kong ( Hong Kong Polytechnic University , PolyU) a software method has been developed for correcting distortion arising in optical data transmission systems. The results of the prototype testing of the system recorded unique performance indicators of the channel: while maintaining the quality of the transmitted signal, its transmission rate exceeded the current record levels of the best existing commercial systems by 24 times and amounted to 240 Gbit / s. Today we will tell you how we managed to achieve similar results and what advantages the new technology reveals.
The growth of Internet traffic associated with the introduction of new technologies and the avalanche-like integration into the global network of various devices sets the data center developers with new tasks, the solution of which requires taking into account a certain amount of bandwidth and performance. One of the bottlenecks in the development of such systems traditionally are the data transmission channels, connecting into a single whole the transmission and reception equipment and the infrastructure of the center. At the same time, existing methods to date do not allow for a significant increase in performance and throughput without the integration of additional equipment and an increase in the number of communication channels, including today's popular optical fiber.
Another problem that developers have to reckon with is distortion of optical signals arising due to multiple reflection and refraction of the beam in the channel during transmission. To neutralize the problem of distortion, so far the arsenal of expensive equipment, the possibility of expensive related technologies and expensive materials are involved.
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The development of specialists from Hong Kong has proven that it is already possible to fundamentally solve the problem today without significantly expanding the capabilities of the hardware infrastructure and increasing the number of existing channels.
As we found out, the intensity of distortions in the fiber-optic channel is directly dependent on the data transfer rate, which is due to the peculiarities of the interaction of photons with glass molecules. This cornerstone imposes a restriction on the capacity of the optical backbone, since it rigidly links the increase in the speed of broadcasting signals with the cost of the hardware complex of the transceiver. Simply put, the higher the speed of data transmission over fiber-optic channels, the higher the cost of the hardware solution due to additional equipment to combat distortion.
The effects that occur in an optical fiber due to the propagation of light are well known and well studied. At the same time, fiber is a collection of billions of arbitrarily located and definitely oriented molecules. Therefore, it is extremely difficult to identify and describe mathematically the patterns in the structure of signal distortion. Nevertheless, using the methods of statistical analysis and comparing large amounts of data at the points of reception and transmission of signals, it is possible to determine some constant dependencies in this chaos, which was illustrated by the software model of the PolyU team of experts.
The proposed algorithm of mathematical analysis allowed to quantitatively describe the total distortion of the optical signal, and then compensate for these distortions in real time at the point of prima located at a distance of 2 km. It is fundamentally important that it is possible to realize a record data transfer speed and solve a complex technical problem related to the physical characteristics of optical signal propagation in optical fiber using the computational power of standard modern processors without the need for fundamental complication and cost increase of the hardware complex.
A software algorithm implemented and confirmed its effectiveness in a series of experiments makes it possible today to implement reception-transmission and data processing systems, which allow, for example, to simultaneously view high-quality 4K-video streaming to 10 thousand subscribers instead of 400 . At the same time, the cost of a ready-made solution providing such performance indicators is four times lower than that of existing alternatives, which will reveal fundamentally new opportunities for the development of IoT, processing of Big Data arrays and the implementation of many other innovative applications.
press release on the University website
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The growth of Internet traffic associated with the introduction of new technologies and the avalanche-like integration into the global network of various devices sets the data center developers with new tasks, the solution of which requires taking into account a certain amount of bandwidth and performance. One of the bottlenecks in the development of such systems traditionally are the data transmission channels, connecting into a single whole the transmission and reception equipment and the infrastructure of the center. At the same time, existing methods to date do not allow for a significant increase in performance and throughput without the integration of additional equipment and an increase in the number of communication channels, including today's popular optical fiber.
Another problem that developers have to reckon with is distortion of optical signals arising due to multiple reflection and refraction of the beam in the channel during transmission. To neutralize the problem of distortion, so far the arsenal of expensive equipment, the possibility of expensive related technologies and expensive materials are involved.
')
The development of specialists from Hong Kong has proven that it is already possible to fundamentally solve the problem today without significantly expanding the capabilities of the hardware infrastructure and increasing the number of existing channels.
As we found out, the intensity of distortions in the fiber-optic channel is directly dependent on the data transfer rate, which is due to the peculiarities of the interaction of photons with glass molecules. This cornerstone imposes a restriction on the capacity of the optical backbone, since it rigidly links the increase in the speed of broadcasting signals with the cost of the hardware complex of the transceiver. Simply put, the higher the speed of data transmission over fiber-optic channels, the higher the cost of the hardware solution due to additional equipment to combat distortion.
The effects that occur in an optical fiber due to the propagation of light are well known and well studied. At the same time, fiber is a collection of billions of arbitrarily located and definitely oriented molecules. Therefore, it is extremely difficult to identify and describe mathematically the patterns in the structure of signal distortion. Nevertheless, using the methods of statistical analysis and comparing large amounts of data at the points of reception and transmission of signals, it is possible to determine some constant dependencies in this chaos, which was illustrated by the software model of the PolyU team of experts.
The proposed algorithm of mathematical analysis allowed to quantitatively describe the total distortion of the optical signal, and then compensate for these distortions in real time at the point of prima located at a distance of 2 km. It is fundamentally important that it is possible to realize a record data transfer speed and solve a complex technical problem related to the physical characteristics of optical signal propagation in optical fiber using the computational power of standard modern processors without the need for fundamental complication and cost increase of the hardware complex.
A software algorithm implemented and confirmed its effectiveness in a series of experiments makes it possible today to implement reception-transmission and data processing systems, which allow, for example, to simultaneously view high-quality 4K-video streaming to 10 thousand subscribers instead of 400 . At the same time, the cost of a ready-made solution providing such performance indicators is four times lower than that of existing alternatives, which will reveal fundamentally new opportunities for the development of IoT, processing of Big Data arrays and the implementation of many other innovative applications.
press release on the University website
Dear readers, we are always happy to meet and wait for you on the pages of our blog. We are ready to continue to share with you the latest news, review materials and other publications, and we will try to do everything possible so that the time spent with us will be useful for you. And, of course, do not forget to subscribe to our headings .
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Source: https://habr.com/ru/post/392745/
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