Wavelength Conversion of 25-Gbit/s PAM-4 Signals Using a Quantum-Dot SOA
Wavelength Conversion of 25-Gbit/s PAM-4 Signals Using a Quantum-Dot SOA
复制标题
DOI：
10.1109/lpt.2018.2798645
复制
发表时间：
2018-03
影响因子：
2.6
通讯作者：
T. Ohtsuki;M. Matsuura
中科院分区：
文献类型：
--
作者：
T. Ohtsuki;M. Matsuura
我们利用量子点半导体光放大器（QD-SOA）中的交叉增益调制（XGM）实现了四电平脉冲幅度调制（PAM-4）信号的全光波长转换。在该方案中，位于QD-SOA输出端的传统光学滤波器的中心通带略微向短波长侧移动[蓝移滤波（BSF）]，这使得我们能够加快QD-SOA的增益恢复时间并减少波长转换过程中的带宽限制。采用XGM和BSF相结合的方法，成功地实现了25 Gbit/s的PAM-4波长转换，在误差矢量幅度方面具有良好的转换性能。我们还研究了在宽波长跳变范围内的转换性能和对输入信号波长偏移的高容忍度，以用于数据中心应用。
We demonstrate all-optical wavelength conversion of a 4-level pulse-amplitude modulation (PAM-4) signal by cross gain modulation (XGM) in a quantum-dot semiconductor optical amplifier (QD-SOA). In this scheme, the center passband of a conventional optical filter located at the QD-SOA output is slightly shifted to the shorter wavelength side [blue-shifted filtering (BSF)], which enables us to accelerate the gain recovery time of the QD-SOA and reduce the bandwidth limitation in the process of the wavelength conversion. By using the combination of XGM and BSF, we successfully achieve 25-Gbit/s PAM-4 wavelength conversion, with good conversion performance in terms of error-vector magnitude. We also investigate the conversion performance in a wide wavelength-hopping range and the high tolerance to the shift in input signal wavelength for use in data center applications.