Bhagyalaxmi Behera, Mihir Narayan Mohanty. “An Analysis of 40Gbits/S SDM Transmission over 50 Km Graded-Index Few-Mode-Fiber Using Optisystem”. International Journal of Advanced Science and Technology, Vol. 29, no. 8s, Apr. 2020, pp. 3106-14, http://sersc.org/journals/index.php/IJAST/article/view/16378.