Amplification of 12 OAM Modes in an air-core erbium doped fiber

被引：52

作者：

Kang, Qiongyue ^{[1
]}

Gregg, Patrick ^{[2
]}

Jung, Yongmin ^{[1
]}

Lim, Ee Leong ^{[1
]}

Alam, Shaif-ul ^{[1
]}

Ramachandran, Siddharth ^{[2
]}

Richardson, David J. ^{[1
]}

机构：

[1] Univ Southampton, Optoelect Res Ctr, Southampton SO17 1BJ, Hants, England

[2] Boston Univ, Dept Elect & Comp Engn, Boston, MA 02215 USA

来源：

OPTICS EXPRESS | 2015年 / 23卷 / 22期

基金：

英国工程与自然科学研究理事会;

关键词：

ORBITAL-ANGULAR-MOMENTUM; TRANSMISSION; AMPLIFIER; DESIGN;

D O I：

10.1364/OE.23.028341

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We theoretically propose an air-core erbium doped fiber amplifier capable of providing relatively uniform gain for 12 orbital angular momentum (OAM) modes (vertical bar L vertical bar = 5, 6 and 7, where vertical bar L vertical bar is the OAM mode order) over the C-band. Amplifier performance under core pumping conditions for a uniformly doped core for each of the supported pump modes (110 in total) was separately assessed. The differential modal gain (DMG) was found to vary significantly depending on the pump mode used, and the minimum DMG was found to be 0.25 dB at 1550 nm provided by the OAM (8,1) pump mode. A tailored confined doping profile can help to reduce the pump mode dependency for core pumped operation and help to increase the number of pump modes that can support a DMG below 1 dB. For the more practical case of cladding-pumped operation, where the pump mode dependency is almost removed, a DMG of 0.25 dB and a small signal gain of >20 dB can be achieved for the 12 OAM modes across the full C-band. (C)2015 Optical Society of America

引用

页码：28341 / 28348

页数：8

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