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Multimode optical fiber transmission system based on high-speed single-mode optical module

A multi-mode fiber and single-mode fiber technology, applied in multi-mode transmission, fiber transmission and other directions, can solve the problems affecting inter-mode coupling, mode group delay, channel interference, inter-symbol interference, etc., to achieve large-scale The effect of coverage, efficient transmission, and cost reduction

Active Publication Date: 2021-12-03
JILIN UNIV
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  • Application Information

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Problems solved by technology

The existence of these eccentric distances will cause different mode excitation and mode coupling at the fiber connection, which will affect the inter-mode coupling and mode group delay in the transmission process.
Inter-mode coupling will lead to energy exchange between multiple signals in the transmission process, resulting in channel interference; the existence of differential mode group delay will make the coupling between the two signals not the coupling between the corresponding symbols at the same time , but the superposition of the symbol of one signal at a certain time and the corresponding symbols of another signal at other times, resulting in intersymbol interference
It can be seen that different inter-mode couplings and differential mode group delays caused by different eccentric distances will have different effects on the signal

Method used

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  • Multimode optical fiber transmission system based on high-speed single-mode optical module
  • Multimode optical fiber transmission system based on high-speed single-mode optical module
  • Multimode optical fiber transmission system based on high-speed single-mode optical module

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Embodiment 1

[0039] The present invention establishes a multi-mode optical fiber signal transmission system based on a high-speed single-mode optical module, and its implementation framework is as follows figure 2 shown. Its system block diagram is as figure 1 As shown, it consists of a signal generation module 1, a mode excitation module 2, a signal transmission module 3, a signal receiving module 4 and a signal analysis module 5, wherein the output port of the signal generation module 1 is connected to the input port of the mode excitation module 2, and the mode The output port of the excitation module 2 is connected to the input port of the signal transmission module 3 , the output port of the signal transmission module 3 is connected to the input port of the signal receiving module 4 , and the output port of the signal receiving module 4 is connected to the input port of the signal analysis module 5 .

[0040] Further, the signal generation module 1 is composed of a signal generator ...

Embodiment 2

[0045] This embodiment provides a design method for the eccentric distance, and the specific steps are as follows:

[0046] In the first step, use Rsoft to simulate the mode excitation of the first multimode fiber from the first single-mode fiber, and set the core / diameter of the first single-mode fiber to 9 / 125m, and the central refractive index to be 1.469. The core / cladding diameter of a multimode fiber is 50 / 125um, the central refractive index is 1.477, the incident mode is LP01, the incident light power is 1, and the eccentric distance is set to 0-10um in turn; at this time, different eccentric The mode excitation under the distance is as follows Figure 5 shown. from Figure 5 It can be seen that when the first single-mode fiber is eccentrically incident on the first multimode fiber, multiple modes will be excited, and the number of excited modes increases with the increase of the eccentric distance, and the main excited modes are LP01, LP11, LP12, LP02, LP21. The nu...

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Abstract

The invention discloses a multimode optical fiber transmission system based on a high-speed single-mode optical module, and belongs to the technical field of optical fiber communication. The system is composed of a signal generation module, a mode excitation module, a signal transmission module, a signal receiving module and a signal analysis module, high-speed short-distance communication is achieved through transmission of a high-speed single-mode optical module in a multimode optical fiber, and compared with other high-speed short-distance communication systems, the communication cost is reduced, and large-scale coverage can be achieved. Meanwhile, a method is provided for the design of the core shift distance in the system, and the maximum core shift distance for ensuring the transmission performance of the system is obtained by designing the reasonable core shift distance, so that the error rate of the system is lower than 2 * 10 <-4 >, a basis is provided for the actual construction of the system, and the effective transmission of the system is realized.

Description

technical field [0001] The invention belongs to the technical field of optical fiber communication, in particular to a multimode optical fiber transmission system based on a high-speed single-mode optical module. Background technique [0002] The development and application of next-generation information technologies such as 5G technology, cloud computing, and big data have promoted the centralization of data traffic. As a functional device to realize the interconnection of internal and external equipment in the data center, the optical module has also developed rapidly with the growth of the data center scale. The explosive demand for data traffic and cloud services makes data centers need to migrate to higher transmission rates, thus promoting the development of optical modules in the direction of high rates. [0003] The transmission based on multimode fiber is an important means of optical interconnection in the data center. The high-speed requirements of the data cente...

Claims

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Application Information

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IPC IPC(8): H04B10/2581
CPCH04B10/2581
Inventor 胡贵军冯泽亮
Owner JILIN UNIV
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