This document outlines the specifications for a single-mode optical fiber and cable designed for use around the 1310 nm zero-dispersion wavelength, suitable for both the 1310 nm and 1550 nm regions, and compatible with analogue and digital transmission. Single-mode fibers (also called monomode fibers) are optical fibers which are designed such that they support only a single propagation mode (LP 01) per polarization direction for a given wavelength. Higher-order modes like LP 11, LP 20 etc. Patch cables that incorporate these fibers are available from stock, see. To define a fiber profile, follow these steps: From the “File” menu click “New” to open a new project. Click the “Fiber Profile” icon in the “Navigator” pane. This low attenuation, step-index fiber has a.