Edwin Jan Klein - Universiteit Twente

Chapter 4
Figure 4.9. A Primitive with instantaneous result forwarding.
A pseudo code implementation of a coupler with a port configuration as shown in
Figure 4.10 is given in Listing 4.2. The coupler is typically an instantaneous optical
construct as was pointed out in Chapter 4.2.1. This is reflected by the code where,
after the actual calculation, the calculation functions of the connected primitives are
called directly. Although only one direction of the signal forwarding is shown in
Figure 4.9 the data between the primitives is actually allowed to be forwarded in any
direction as dictated by the implementation rules. In Listing 4.2 this bi-directionality
is implemented using two separate calculations where one is called for data entering
port 1 or 2 and the other for data entering port 3 or 4.
Figure 4.10. A coupler primitive and its nodes.
Listing 4.2. Pseudo code for the calculation function of coupler primitive.
(instantaneous primitive)
Calculate()
{
If a new value has been placed on ports 1 or 2
{
Calculate the values at ports 3 and 4 the using the coupler
propagation matrix (eq. 2.8);
}
}
Primitive
n1
n2
I1
Im
Primitive
F ( x .. xn
, I1..
I
1 m
Find the ports that are connected to ports 3 and 4 and place the values
calculated for port 3 and 4 in these ports;
Call the Calculation() function of the primitives that are the parent of these ports
If a new value has been placed on ports 3 or 4
{
……………………
}
86
)
n3
n4
O1
Primitive