Multilevel Phase-Preserving Amplitude Regeneration Using a Single Nonlinear Amplifying Loop Mirror

被引：21
|
作者：
Hierold, Martin [1 ]
Roethlingshoefer, Tobias [2 ]
Sponsel, Klaus [2 ]
Onishchukov, Georgy [2 ]
Schmauss, Bernhard [1 ]
Leuchs, Gerd [2 ]
机构：
[1] Univ Erlangen Nurnberg, Inst Microwave Technol, D-91058 Erlangen, Germany
[2] Max Planck Inst Sci Light, D-91058 Erlangen, Germany
来源：
IEEE PHOTONICS TECHNOLOGY LETTERS | 2011年 / 23卷 / 14期
关键词：
All-optical regeneration; amplitude regeneration; multilevel transmission formats; nonlinear amplifying loop mirror (NALM); nonlinear phase noise; quadrature amplitude modulation (QAM); SYSTEMS;
D O I：
10.1109/LPT.2011.2149510
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
A possibility of multilevel phase-preserving amplitude regeneration using a nonlinear amplifying loop mirror (NALM) is presented for the optical star-8 quadrature amplitude modulation (QAM) transmission format as an example. Two significantly different state power ratios for the QAM signal, 1:3 and 1:7, were investigated. After the optimization of the coupler splitting ratio and the directional phase bias in the NALM, amplitude noise can be efficiently suppressed at both signal power levels simultaneously. Bit-error-ratio (BER) simulations have shown that in a system limited by nonlinear phase noise, the deployment of the NALM allows an increase of the fiber launch power by 1.9 and 2.2 dB at a BER of 10(-3) for a state power ratio of 1:3 and 1:7, respectively. The regeneration limits due to imperfections of the power transfer characteristic are also discussed.
引用
收藏
页码：1007 / 1009
页数：3
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