A Method for Measuring the Absorption Coefficient of Few-Mode Erbium-doped Optical Fiber
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An absorption coefficient, erbium-doped fiber technology, applied in the field of optical communication, can solve the problems of high price, error in measurement results, fiber loss, etc., and achieve the effects of accurate measurement results, saving experimental materials, and low experimental costs.
What is AI technical title?
AI technical title is built by PatSnap AI team. It summarizes the technical point description of the patent document.
An absorption coefficient, erbium-doped fiber technology, applied in the field of optical communication, can solve the problems of high price, error in measurement results, fiber loss, etc., and achieve the effects of accurate measurement results, saving experimental materials, and low experimental costs.
CN112781840BActive 📅 Publication Date: 2021-10-22UNIV OF ELECTRONICS SCI & TECH OF CHINA
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[0038] figure 1 It is a flowchart of a method for measuring the absorption coefficient of a few-mode erbium-doped optical fiber in the present invention.
[0039] In this example, if figure 1 Shown, a kind of method for measuring few-mode erbium-doped optical fiber absorption coefficient of the present invention comprises the following steps:
[0040] S1, sample fiber welding;
[0041] In this example, figure 2 A diagram of the device for measuring the absorption coefficient of the few-mode erbium-doped fiber is given; a piece of few-mode erbium-doped bare fiber with a length of L=1.9m is selected as the sample fiber, and the two ends of the sample fiber are welded together with the G.652 single-mode pigtail ,Such as image 3 As shown in (a); the refractive index of single-mode pigtail and sample fiber is as follows image 3 As shown in (b), according to the refractive index distribution of the single-mode pigtail and the sample fiber, the mode excitation relationship di...
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Abstract
The invention discloses a method for measuring the absorption coefficient of a few-mode erbium-doped optical fiber. Under the pumping condition of the fundamental-mode optical fiber, the fundamental-mode signal light is obtained by measuring the input and output signal light and pump light power of the few-mode erbium-doped optical fiber. gain, and calculate the number of particle number inversions; then change the power of the pump light, measure the change curve of the gain with the particle number inversion, and then fit the ρ according to the curve l Gain G when =0 0 , so as to calculate the absorption coefficient of the fundamental mode optical signal; finally, according to the erbium ion concentration and refractive index distribution of the few-mode erbium-doped fiber, calculate the mode field distribution of each mode, and then calculate the few-mode Absorption coefficient of high-order mode signal light in Erbium-doped fiber.
Description
technical field [0001] The invention belongs to the technical field of optical communication, and more specifically relates to a method for measuring the absorption coefficient of a few-mode erbium-doped optical fiber. Background technique [0002] At present, based on technologies such as wavelength division multiplexing, polarization multiplexing, and multi-level modulation, the transmission capacity of a single fiber can reach 100 Tbit / s, and the transmission capacity of single-mode fiber (SMF) is close to Shannon's limit. To further increase the transmission capacity of optical fibers, it is necessary to utilize a new optical fiber dimension—spatial mode. The mode-division multiplexing (MDM) technology based on few-mode fiber has great potential in improving transmission capacity, and has continuously attracted attention at home and abroad. [0003] The WDM long-distance transmission system based on single-mode fiber is inseparable from the traditional erbium-doped fibe...
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