Martelli P, Boffi P, Ferrario M, Marazzi L, Parolari P, Siano R, Pusino V, Minzioni P, Cristiani I, Langrock C, Fejer M M, Martinelli M, Degiorgio V
PoliCom, Dept. of Electronics and Information, Politecnico di Milano, Via G. Colombo 81, 20133 Milano, Italy.
Opt Express. 2009 Sep 28;17(20):17758-63. doi: 10.1364/OE.17.017758.
We present the results of an in-depth experimental investigation about all-optical wavelength conversion of a 100-Gb/s polarization-multiplexed (POLMUX) signal. Each polarization channel is modulated at 25 Gbaud by differential quadrature phase-shift keying (DQPSK). The conversion is realized exploiting the high nonlinear chi((2)) coefficient of a periodically poled lithium niobate waveguide, in a polarization-independent configuration. We find that slight non-idealities in the polarization independent setup of the wavelength converter can significantly impair the performance of POLMUX systems. We show that high-quality wavelength conversion can be nevertheless achieved for both the polarization channels, provided that an accurate optimization of the setup is performed. This is the first demonstration, to the best of our knowledge, of the possibility to obtain penalty-free all-optical wavelength conversion in a 100-Gb/s POLMUX transmission system using direct-detection.
我们展示了关于100Gb/s偏振复用（POLMUX）信号全光波长转换的深入实验研究结果。每个偏振通道通过差分正交相移键控（DQPSK）以25G波特进行调制。利用周期性极化铌酸锂波导的高非线性χ(2)系数，在偏振无关配置下实现了转换。我们发现波长转换器偏振无关设置中的轻微非理想性会显著损害POLMUX系统的性能。我们表明，只要对设置进行精确优化，两个偏振通道仍可实现高质量的波长转换。据我们所知，这是首次证明在100Gb/s POLMUX传输系统中使用直接检测实现无代价全光波长转换的可能性。
