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Multimode fiber transmission method based on subcarrier index modulation

A technology of index modulation and multi-mode optical fiber, which is applied in the field of optical signal transmission, can solve the problems of reducing the spectrum utilization rate of the system, and achieve the effects of avoiding frequency selective fading, improving performance, and reducing bit error rate

Active Publication Date: 2017-11-03
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

However, this is at the expense of the application of low-order modulation formats and the reduction of system spectrum utilization

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  • Multimode fiber transmission method based on subcarrier index modulation
  • Multimode fiber transmission method based on subcarrier index modulation

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Embodiment Construction

[0016] In a traditional OFDM system, the signal light generated by direct modulation or external modulation is transmitted by a multimode fiber and received by a photodetector at the receiving end. Taking the system of direct modulation and direct detection as an example, the digital signal is directly loaded on the laser for modulation, but the system will produce nonlinear distortion effects such as frequency chirp and phase modulation, resulting in unsatisfactory performance during high-speed transmission. In multimode optical fiber channels, the influence of modal dispersion on system transmission performance is dominant, and it is also the most important factor limiting the transmission capacity of optical fibers. The reason for this is that there are many transmission modes in multimode optical fibers, and the optical propagation paths and speeds of each mode are different. , so that the arrival time of each mode at the output end of the fiber is inconsistent, resulting i...

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Abstract

The invention provides a multimode fiber transmission method based on subcarrier index modulation. An additional modulation dimension is added based on the conventional two-dimensional amplitude / phase modulation APM, and the main thinking method is to transmit information through an index number of a subcarrier; some carriers are selected to be silent and data is not sent, so that the possible deep fading at the frequencies can be avoided, and a purpose of restraining intersymbol interference is realized. An SIM is different from the conventional OFDM, all subcarriers of the conventional OFDM can transmit the data and the SIM transmits some bits in a form of subcarrier index numbers. A combinatorial mathematics theory for bit selection can be corresponding to different subcarrier index manners, the part of bits are not transmitted, but are taken as carrier distribution information to be added into the whole system. According to the method, the frequency selective fading of a multimode fiber can be avoided to a certain probability, so that the performance can be remarkably improved, and the bit error rate is reduced.

Description

technical field [0001] The technology relates to optical signal transmission, and in particular to multimode fiber channel transmission. Background technique [0002] With the continuous growth of communication services in modern society, more and more perfect short-distance communication networks have attracted more and more attention. Fiber-to-the-home and fiber-to-the-desktop have become the inevitable trend of optical communication development. Compared with single-mode fiber SMF, multimode fiber MMF has many advantages such as large numerical aperture, easy alignment of connection, and low cost of supporting devices, and has become the preferred transmission medium for short-distance optical fiber communication. However, since there are hundreds of modes transmitted in multimode fiber, and the propagation constants and group velocities of each mode are different, the fiber loss is large, and the transmission capacity is limited due to the large influence of modal disper...

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Application Information

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IPC IPC(8): H04B10/2581H04L27/26
CPCH04B10/2581H04L27/2601H04L27/2637
Inventor 张静易兴文黄夏涛周文静江洋邱昆
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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