In-Band Estimation of Optical Signal-to-Noise Ratio From Equalized Signals in Digital Coherent Receivers

被引：49

作者：

Faruk, Md Saifuddin ^{[1
]}

Mori, Yojiro ^{[2
]}

Kikuchi, Kazuro ^{[3
]}

机构：

[1] Dhaka Univ Engn & Technol, Dept Elect & Elect Engn, Gazipur 1700, Bangladesh

[2] Nagoya Univ, Dept Elect Engn & Comp Sci, Nagoya, Aichi 4668550, Japan

[3] Univ Tokyo, Dept Elect Engn & Informat Syst, Tokyo 1130033, Japan

来源：

IEEE PHOTONICS JOURNAL | 2014年 / 6卷 / 01期

关键词：

Optical signal-to-noise ratio; digital coherent receivers; digital signal processing; Nyquist-WDM; ROADM; FILTERS; OSNR;

D O I：

10.1109/JPHOT.2014.2304557

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：

We propose a novel method of in-band estimation of optical signal-to-noise ratio (OSNR) using a digital coherent receiver, where OSNR is determined from second-and fourth-order statistical moments of equalized signals in any modulation format. Our proposed method is especially important in recently-developed Nyquist wavelength-division multiplexed (WDM) systems and/or reconfigurable optical-add/drop-multiplexed (ROADM) networks, because in these systems and networks, we cannot apply the conventional OSNR estimation method based on optical-spectrum measurements of the in-band signal and the out-of-band noise. Effectiveness of the proposed method is validated with computer simulations of Nyquist-WDM systems and ROADM networks using 25-Gbaud quadrature phase-shift keying (QPSK) and 16 quadrature-amplitude modulation (16-QAM) formats.

引用

页数：9

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