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Multi-core optical fiber, transmission system and multi-core optical fiber capacity expansion method

A technology of multi-core optical fiber and transmission system, which is applied in the field of transmission system and multi-core optical fiber expansion, multi-core optical fiber, and can solve the problems that cannot support the application of ultra-long-distance weakly coupled multi-core transmission system

Pending Publication Date: 2022-06-21
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This contradicts the development of engineering technology. For example, the limited MIMO equalization logic scale and power consumption in the short term cannot support the application of ultra-long-distance weakly coupled multi-core transmission systems.

Method used

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  • Multi-core optical fiber, transmission system and multi-core optical fiber capacity expansion method
  • Multi-core optical fiber, transmission system and multi-core optical fiber capacity expansion method
  • Multi-core optical fiber, transmission system and multi-core optical fiber capacity expansion method

Examples

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Embodiment 1

[0038] figure 1 A schematic cross-sectional view of a multi-core optical fiber provided in an embodiment of the present application. like figure 1 As shown, the multi-core optical fiber provided by the present application includes 9 cores (Core0-Core8). Among them, the core (Core 0) located at the center of the multi-core fiber is called the central core, and the eight cores (Core1-Core8) located around the core (Core 0) are called the surrounding cores.

[0039] For the central core (Core0), in order to have no coupling with other surrounding cores (Core0-Core8), a channel layer with a low refractive index is provided to suppress crosstalk with the surrounding cores (Core0-Core8). question. In addition, the central core (Core0) is doped with germanium to make its optical performance compatible with the optical parameters of the existing standard single-mode fiber (ITU-T G.652 standard), so that the central core (Core0) can be compatible with other Optical fibers with a ce...

Embodiment 2

[0061] Figure 5 This is a schematic structural diagram of a multi-core optical fiber transmission system provided in an embodiment of the present application. like Figure 5 As shown, the system includes N optical terminal multiplexers (OTM) 501, M optical line amplifiers (OLA) 502 and L optical fibers 503, and N and M are positive values ​​greater than 2 Integer, L is a positive integer greater than 3. Wherein, each OTM 501 is connected to an OLA 502 through an optical fiber, one end of each OLA 502 is connected to the OTM 501 , and the other end is connected to one end of another OLA 502 .

[0062] The OTM 501 includes an optical transponder unit (OTU) 5011 , a wavelength multiplexer / demultiplexer (W Mux / W DMux) 5012 and a fan-in / fan-out device 5013 .

[0063] OTU 5011 can be divided into existing single wavelength or frequency super channel OTU and space super channel OTU. Among them, the existing single-wavelength or frequency super-channel OTU is connected to one fib...

Embodiment 3

[0070] 6(a)-(d) are diagrams of the evolution process from single-mode optical fiber smoothing to multi-core optical fiber provided by the embodiments of the present application.

[0071]As shown in FIG. 6( a ), an existing single-mode optical fiber transmission system includes two OTMs, two OLAs (including two single-mode optical fiber amplifiers) and single-mode optical fibers. Among them, one OTM is deployed at the near end (take the left OTM as an example, the same below), and the other OTM is deployed at the far end (take the right OTM as an example, the same below). The demultiplexer is connected to an OLA through a single-mode fiber to compensate for fiber attenuation, and then the OLAs at both ends are connected to the single-mode fiber between the near-end and the far-end respectively, thereby constructing a single-mode fiber transmission system.

[0072] In the signal transmission process, after the optical signal is sent by the near-end OTM, it is transmitted to the...

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Abstract

The invention provides a multi-core optical fiber, a transmission system and a multi-core optical fiber capacity expansion method, and relates to the technical field of optical fibers. Wherein the multi-core optical fiber comprises a central fiber core and at least two groups of non-central fiber cores, and each group of non-central fiber cores comprises at least two non-central fiber cores. The central fiber core is located at the center of the whole multi-core optical fiber, the at least two groups of non-central fiber cores are respectively arranged around the central fiber core according to a certain rule, and the distances between the non-central fiber cores and the central fiber core in each group of non-central fiber cores are equal. According to the invention, energy transmitted between the central fiber core and any group of non-central fiber cores and between each group of non-central fiber cores is free of crosstalk or is weak in crosstalk, so that the multi-core optical fiber can be smoothly upgraded from a single-mode optical fiber to a multi-core optical fiber, and the investment of customer optical fibers and old network equipment is protected; through crosstalk of energy transmitted between the fiber cores in each group of non-central fiber cores, the channel number and bandwidth of the multi-core fiber are improved, and the problem of large dispersion between modes is solved.

Description

technical field [0001] The invention relates to the technical field of optical fibers, in particular to a multi-core optical fiber, a transmission system and a method for expanding the capacity of the multi-core optical fiber. Background technique [0002] With the commercialization of 5G and the future evolution to 6G, the demand for optical fiber communication bandwidth will continue to grow. However, the capacity that ordinary single-core single-mode fiber can support has approached the Shannon limit, and the continuous improvement has encountered a bottleneck. [0003] Space-division multiplexing (SDM) technology is widely regarded as the direction of next-generation optical fiber communication systems. Weakly coupled multi-core fibers have high spatial channel density, and the differential mode dispersion coefficient is significantly lower than that of strong-coupled multi-core fibers. The demodulation complexity of multiple input multiple output (MIMO) at the receivin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/2513H04B10/2569H04B10/25H04B10/2581H04J14/02G02B6/02
CPCH04B10/2513H04B10/2569H04B10/2581H04J14/0202G02B6/02042H04J14/02G02B6/02H04B10/25
Inventor 张文斗柏云龙
Owner HUAWEI TECH CO LTD
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