Simple and robust symbol rate estimation method for digital coherent optical receivers

被引：3
|
作者：
Cui, Sheng [1 ,2 ]
Xia, Wenjuan [1 ]
Shang, Jin [1 ]
Ke, Changjian [1 ,2 ]
Fu, Songnian [1 ,2 ]
Liu, Deming [1 ,2 ]
机构：
[1] Natl Engn Lab Next Generat Internet Access Syst, Wuhan 430074, Hubei, Peoples R China
[2] Huazhong Univ Sci & Technol, Sch Opt & Elect Informat, Wuhan 430074, Hubei, Peoples R China
来源：
OPTICS COMMUNICATIONS | 2016年 / 366卷
基金：
中国国家自然科学基金; 国家高技术研究发展计划(863计划);
关键词：
Coherent communications; Dynamic optical network; Symbol rate estimation; Chromatic dispersion estimation; Polarization mode dispersion; Digital signal processing; MODULATION FORMAT IDENTIFICATION; EQUALIZATION; RECOVERY;
D O I：
10.1016/j.optcom.2015.12.068
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
A novel symbol rate estimation (SRE) technique utilizing the clock tone (CT) obtained by Godard timing recovery algorithm is proposed. By this technique, the known sampling rate of the analog-to-digital converter (ADC) in digital coherent optical receivers can used as a reference to directly determine the unknown signal symbol rate. The impact of polarization mode dispersion (PMD) on the CT magnitude can be mitigated by using the hybrid correlation function (HCF) consisting of both auto-correlation function (ACF) and cross-correlation function (XCF) of the received signal spectrum, while the chromatic dispersion (CD) impact can be mitigated by adaptive CD compensation techniques. This technique is simple, accurate, applicable to advanced modulation formats commonly used, and robust to various link impairments. Numerical simulations and experimental results are presented to validate this technique. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码：200 / 204
页数：5
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