The Triangular core fiber can be defined as:

BPM - Equation

To implement the above equation in User Function Profile, we will first explain the User Variables and User Functions (see Table 12).

BPM - Table 12 User Variables and User Functions

Table 12: User Variables and User Functions

Therefore, Triangular Core Fiber equation can be defined as follows:

BPM - Equation 1

with the limits as follows:

BPM - Equation 2