Robust, signed, online chromatic dispersion detection in a 40-Gbit/s optical transmission link

被引：0

作者：

D. Sandel

V. Mirvoda

F. Wüst

R. Noé

机构：

[1] Optical Commun./High-Frequency Eng., Elec. Eng./Information Technology, University of Paderborn, 33098 Paderborn

来源：

Electrical Engineering | 2003年 / 85卷 / 1期

关键词：

Arrival time detection; Chromatic dispersion; Clock recovery; Optical fiber transmission; Phase-locked loop;

D O I：

10.1007/s00202-002-0138-2

中图分类号：

学科分类号：

摘要：

Chromatic dispersion in optical single-mode fibers, i.e., the wavelength dependence of the propagation delay, distorts pulses and is the biggest obstacle in 40-Gbit/s transmission systems. Drop-in chromatic dispersion compensators require its online detection. In a 40-Gbit/s transmitter we modulate the power of the laser at 5 MHz by 1.2% rms. In the presence of chromatic dispersion, the associated periodic frequency variation modulates the signal arrival time, which is measured with a 100-as uncertainty by lock-in detection of the oscillator control voltage in the receiver clock recovery. Dispersion from - 268 to +350 ps/nm is detected including its sign, more than by any comparable technique. Moreover, no extra optics or high-frequency electronics are needed, which makes this method extremely cheap to implement.

引用

页码：41 / 44

页数：3

共 8 条

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