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All-fiber type weak-coupling few-mode erbium-doped optical fiber amplifier

An erbium-doped fiber and weak coupling technology, which is applied in the field of all-fiber weak-coupling few-mode erbium-doped fiber amplifiers, can solve the problems of complexity and high cost, mode coupling power loss, and large mode coupling, and reduce the differential mode gain. , easy debugging and simple structure

Active Publication Date: 2018-11-06
PEKING UNIV
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Problems solved by technology

It should be pointed out that the current photonic lanterns are difficult to prepare and the mode coupling is relatively large, so they cannot be applied to weakly coupled transmission systems.
In addition, due to the use of a single-mode wavelength division multiplexer, when it is used for online amplification in a long-distance transmission system, it is necessary to demultiplex the signal first and then combine it with the pump light, then perform signal multiplexing and finally perform Amplification, the complexity and cost of this technology are relatively high, and it will introduce additional mode coupling and power loss

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  • All-fiber type weak-coupling few-mode erbium-doped optical fiber amplifier
  • All-fiber type weak-coupling few-mode erbium-doped optical fiber amplifier
  • All-fiber type weak-coupling few-mode erbium-doped optical fiber amplifier

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Embodiment Construction

[0030] In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific embodiments are described in detail in conjunction with the accompanying drawings.

[0031] The present invention proposes an all-fiber type weakly coupled few-mode erbium-doped fiber amplifier structure, and its basic structure is as follows figure 1 shown. In the mode-division multiplexing long-distance transmission system, after the mode-division multiplexing signal is transmitted through the few-mode fiber, due to the attenuation of the fiber, it cannot continue to transmit forward, so it needs to be connected to the few-mode erbium-doped fiber amplifier for amplification. In the few-mode erbium-doped fiber amplifier, firstly, the mode conversion of the pump light is performed by using the all-fiber mode selective coupler, and its structure is as follows figure 2 shown. It should be pointed out that, figure 2 It is a schematic diagra...

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Abstract

The invention discloses an all-fiber type weak-coupling few-mode erbium-doped optical fiber amplifier. The erbium-doped optical fiber amplifier of the invention comprises a mode selection coupler, a signal-pump combiner and a few-mode erbium-doped optical fiber, wherein the mode selection coupler is used for converting the input single-mode pump light into light of a corresponding mode respectively; an input end of the signal-pump combiner is connected with an output end of the mode selection coupler for performing coupling output on an input modular multiplexing signal light and the pump light subjected to mode conversion of the mode selection coupler, and the output end of the signal-pump combiner is connected with the few-mode erbium-doped optical fiber. The all-fiber type weak-couplingfew-mode erbium-doped optical fiber amplifier disclosed by the invention has the advantages of small volume, simple structure, easy debugging, and full compatibility with an optical fiber transmission link, and can be completely applied to a weak-coupling transmission system.

Description

technical field [0001] The invention belongs to the technical field of optical fiber communication, and relates to an all-fiber type weak coupling few-mode erbium-doped optical fiber amplifier. Background technique [0002] With the development of Internet technology, new services such as high-definition television and mobile multimedia continue to emerge, and the demand for information transmission bandwidth continues to grow exponentially. Due to the limitation of the nonlinear Shannon limit, the traditional single-mode optical fiber has a transmission capacity of 100-Tbit / s. is the limit, so we need to study new technologies to further enhance the transmission capacity of optical networks. In recent years, the use of few-mode fiber as a new spatial multiplexing method has received widespread attention, and has been proven to be an effective way to increase the capacity of optical transmission systems. At present, the mode division multiplexing system is divided into two ...

Claims

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Application Information

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IPC IPC(8): H01S3/067H01S3/091
CPCH01S3/06716H01S3/06754H01S3/091
Inventor 李巨浩朱景龙陈章渊何永琪
Owner PEKING UNIV
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