Stable QPSK Demodulation Using a Digital Optical Phase-Locked Loop

被引：4

作者：

Fujii, Akihiro ^{[1
]}

Shirazawa, Futoshi ^{[2
]}

Kanda, Yoshiro ^{[1
]}

Murai, Hitoshi ^{[1
]}

机构：

[1] Oki Elect Ind Co Ltd, Ctr Corp Res & Dev, Warabi 3358510, Japan

[2] Alnair Labs Corp, Shinagawa 1410031, Japan

来源：

IEEE PHOTONICS TECHNOLOGY LETTERS | 2014年 / 26卷 / 18期

关键词：

Optical Phase Locked-loop (OPLL); homodyne detection; Quaternary Phase Shift Keying (QPSK); LINEWIDTH REQUIREMENTS; HETERODYNE-DETECTION; HOMODYNE;

D O I：

10.1109/LPT.2014.2337888

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 demonstrated stable error-free demodulation of 20-Gb/s Quaternary Phase-Shift-Keying (QPSK) for 80-km fiber transmission with a Digital Optical Phase Locked-Loop (DOPLL). We used a second order Active Loop Filter (ALF), which gave better stability than the first order ALF commonly used in conventional OPLLs, and optimized the LF constants. We theoretically compared the system stability with the second order ALF to that with the first order ALF and showed that the former had better phase margins under the assumption that they had the same loop bandwidth. This result indicates that the second order ALF is suitable for operation under noise attributed to the digital processing.

引用

页码：1847 / 1850

页数：4

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