Chughtai Mohsan Niaz, Forzati Marco, Mårtensson Jonas, Rafique Danish
Photonic Systems Group, Tyndall National Institute and Department of EE /Physics, UCC, Cork, Ireland.
Opt Express. 2012 Mar 26;20(7):8155-60. doi: 10.1364/OE.20.008155.
In this paper we numerically investigate nonlinear impairments in a WDM system with mixed PM (D)QPSK and OOK channels. First we analyze the dependence of XPM and XPolM on SOP and baud rate in absence of PMD. In this case we find that the nonlinear impairments are highly dependent on relative SOP between the PM (D)QPSK and neighbouring OOK channels. The dependence on relative SOP is more pronounced in differential detection than in coherent detection. However, with increasing values of PMD this dependence decreases, and non-linear tolerance improves.
在本文中，我们对具有混合偏振复用（差分）四相相移键控（PM（D）QPSK）和开关键控（OOK）信道的波分复用（WDM）系统中的非线性损伤进行了数值研究。首先，我们分析了在不存在偏振模色散（PMD）的情况下，交叉相位调制（XPM）和交叉偏振调制（XPolM）对信号光偏振态（SOP）和波特率的依赖性。在这种情况下，我们发现非线性损伤高度依赖于PM（D）QPSK与相邻OOK信道之间的相对SOP。与相干检测相比，差分检测中对相对SOP的依赖性更为明显。然而，随着PMD值的增加，这种依赖性会降低，并且非线性容限会提高。
