On the Analysis and Comparison of Decoupled Modal Gain Equalization Systems for Four-Mode (4M)-EDFAs

Optik ◽  
2020 ◽  
Vol 208 ◽  
pp. 164498 ◽  
Author(s):  
Taban Qayoom ◽  
Gausia Qazi
Keyword(s):  
Modal Gain ◽  
Gain Equalization

Azimuthal dependence of modal gain and its impact on gain equalization in multimode erbium-doped fiber amplifiers

Optik ◽  
2015 ◽  
Vol 126 (23) ◽  
pp. 3538-3543
Author(s):  
Zujun Qin ◽  
Song Ye ◽  
Wentao Zhang ◽  
Xianming Xiong
Keyword(s):  
Fiber Amplifiers ◽  
Azimuthal Dependence ◽  
Modal Gain ◽  
Erbium Doped ◽  
Gain Equalization

scholarly journals Gain Equalization for Few-Mode Erbium-Doped Fiber Amplifiers via Strong Mode Coupling

2022 ◽  
Vol 12 (2) ◽  
pp. 767
Author(s):  
Yaping Liu ◽  
Zhiqun Yang ◽  
Xutao Wang ◽  
Yongmin Jung ◽  
Lin Zhang
Keyword(s):  
Numerical Model ◽  
Transfer Matrix ◽  
Mode Coupling ◽  
Fiber Amplifiers ◽  
Modal Gain ◽  
Erbium Doped ◽  
Different Types ◽  
Gain Equalization ◽  
Strong Mode ◽  
Step Index Fiber

Few-mode erbium-doped fiber amplifiers (FM-EDFAs) are one of the most important optical subsystems for successful space division multiplexed transmission systems. In this paper, we propose a new FM-EDFA designed to achieve significantly reduced differential modal gain (DMG) via strong mode coupling. Using a new numerical model based on a fiber transfer matrix, the DMGs of FM-EDFAs are systematically investigated and two different types of six-mode fiber amplifiers are analyzed, as exemplar demonstrations. In a uniformly doped step-index fiber, the DMG can be reduced from 9.3 to 1.1 dB (i.e., 8.2 dB reduction) and further reduced to 0.5 dB in a dual-layer doping structure.

Adaptive Modal Gain Equalization Techniques in Multi-Mode Erbium-Doped Fiber Amplifiers

2014 ◽  
Vol 32 (11) ◽  
pp. 2133-2143 ◽  
Author(s):  
Reza Nasiri Mahalati ◽  
Daulet Askarov ◽  
Joseph M. Kahn
Keyword(s):  
Fiber Amplifiers ◽  
Modal Gain ◽  
Erbium Doped ◽  
Gain Equalization ◽  
Multi Mode

scholarly journals Experimental Measurement of Absorption Coefficients for Effective Erbium-Doping Concentration to Optimize Few-Mode Erbium-Doped Fiber Amplifiers with Low Differential Mode Gain

Photonics ◽  
2021 ◽  
Vol 8 (6) ◽  
pp. 185
Author(s):  
Yan Xu ◽  
Baojian Wu ◽  
Xinrui Jiang ◽  
Haomiao Guo ◽  
Feng Wen
Keyword(s):  
Doping Concentration ◽  
Point Of View ◽  
Fiber Amplifiers ◽  
Efficient Design ◽  
Absorption Loss ◽  
Differential Mode ◽  
Transmission Method ◽  
Modal Gain ◽  
Analysis Process ◽  
Erbium Doped

According to the analytical expression for modal gain of few-mode erbium-doped fiber amplifiers (FM-EDFAs), we propose a method of measuring the absorption loss coefficients of few-mode signals in few-mode erbium-doped fibers (FM-EDFs) by extrapolating the mode–gain curve dependent on the average population inversion. The absorption loss coefficient of an FM-EDF was measured in our experimental platform and used to estimate the effective erbium-ion doping concentration. The feasibility of the extrapolation method was verified by simulation and comparison with the transmission method. Furthermore, the FM-EDFAs with high modal gain and low differential mode gain (DMG) could be optimized by adjusting the FM-EDF’s length and pump power. The analysis process presented here is very useful for the efficient design of FM-EDFAs from a practical point of view.

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