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Low-differential-mode gain few-mode erbium-doped optical fiber amplifier

An erbium-doped fiber, differential mode gain technology, applied in the field of optical communication, can solve the problems of difficulty in taking into account modes, insufficient flexibility, limited ability to equalize differential mode gain, etc., and achieve the effect of improving gain and strong flexibility

Inactive Publication Date: 2019-05-24
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] There are two main methods to reduce the differential mode gain that are commonly used at present: one is to control the light intensity distribution of the pump mode, which only uses the light intensity information, and the control is not accurate enough
The second is to design the structure of erbium-doped fiber to optimize the doping distribution of erbium ions in the fiber, but it is still optimized according to the light intensity information, and it depends on the design of complex erbium-doped fiber structure, and the manufacturing process is complicated
The two methods have limited ability to equalize differential mode gain, lack of flexibility, uncontrollable between modes, and it is difficult to take into account all modes

Method used

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  • Low-differential-mode gain few-mode erbium-doped optical fiber amplifier
  • Low-differential-mode gain few-mode erbium-doped optical fiber amplifier
  • Low-differential-mode gain few-mode erbium-doped optical fiber amplifier

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Embodiment

[0026] figure 2 It is a principle diagram of a few-mode erbium-doped fiber amplifier with low differential mode gain of the present invention.

[0027] In this example, if figure 2 As shown, a low differential mode gain few-mode erbium-doped fiber amplifier of the present invention includes: a coherent pump unit, a signal mode multiplexer, a wavelength division multiplexer, a first optical isolator, a few-mode erbium-doped optical fiber, the first Two optical isolators, optical filters and signal mode demultiplexers.

[0028] Among them, such as figure 2 As shown, the coherent pump unit includes a pump laser, a wave splitter, a mode converter, a phase controller and a pump mode division multiplexer;

[0029] The pump laser generates a high-power pump light signal, which is input to the wave splitter, and the wave splitter converts the pump light signal into multiple pump light signals; the mode converter converts each pump light signal into the required In the pumping m...

example

[0045] For the convenience of description, it is assumed that the modes of both the signal light and the pump light are LP 01 and LP 11a Two linear polarization modes.

[0046] First, using LP 01 and LP 11a The pump light of the two modes pumps the few-mode erbium-doped fiber in the same direction. In a coherent pump unit, the pump laser outputs LP 01 Mode high-power 980nm pump light, and then split into two beams by a 1×2 wave splitter, one of which is converted to LP by a mode converter 11a mode, and finally the pump mode multiplexer converts the LP 01 and LP 11aThe pump light of both modes is multiplexed into one fiber.

[0047] Secondly, the dispersion characteristics of the few-mode erbium-doped fiber are closely related to the structure of the fiber. Here, a step-type weakly conductive erbium-doped fiber is considered, and the total concentration of erbium ions is 2×10 24 m -3 and uniformly doped in the core. The propagation constant of the erbium-doped fiber c...

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Abstract

The invention discloses a low-differential-mode gain few-mode erbium-doped optical fiber amplifier. Optical signals in different modes are multiplexed into one optical signal through a signal mode multiplexer, and the optical signal and the pumping light outputted by a coherent pumping unit pass through an optical isolator to be coupled to a few-mode erbium-doped optical fiber. The optical signalsin different modes are amplified by the few-mode erbium-doped optical fiber, thereby increasing the gains of the optical signals. Finally, the optical signals in the effective bandwidth are filteredout through the optical filter, thereby eliminating the noise interference of other frequency band. The optical signals in different modes are obtained through demultiplexing operation of a signal mode demultiplexer.

Description

technical field [0001] The invention belongs to the technical field of optical communication, and more specifically relates to a low-differential-mode-gain few-mode erbium-doped optical fiber amplifier. Background technique [0002] In order to break through the transmission capacity limitations of traditional single-mode optical fiber systems, space-division multiplexing or mode-division multiplexing technologies represented by multi-core optical fibers, few-mode optical fibers, few-mode multi-core optical fibers, and orbital angular momentum have become research hotspots in the field of optical fiber communications. , they increase the optical fiber transmission capacity from the spatial dimension. In the mode division multiplexing system, the few-mode erbium-doped fiber amplifier can amplify multiple modes at the same time, effectively reducing the transmission cost per bit. [0003] At present, commercial few-mode erbium-doped fiber amplifier products can realize the am...

Claims

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Application Information

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IPC IPC(8): H01S3/094H01S3/10H01S3/067
CPCH01S3/067H01S3/094H01S3/10H01S3/13
Inventor 武保剑陈相玮文峰邱昆
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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