siph_term :
An optical termination element.

The siph_term primitive represents an optical termination element that absorbs all the energy at the end of the optical waveguide without causing reflections. It is modeled with an equivalent resistor of which resistance value is matched to the characteristic impedance of the optical waveguide.

The parameter Zrel specifies the waveguide’s characteristic impedance relative to a reference impedance (Z0) of your choice. Note that the use of this relative impedance allows one to determine the amount of reflections at impedance discontinuities without having to know the absolute values of the characteristic impedances. While the choice of the reference impedance (Z0) can be arbitrary, it must be consistent across all the silicon-photonic components used in a system. In other words, all the equivalent circuit elements describing the impedance relationships at the optical ports must use the impedance values relative to the same Z0.

Input/Output Terminals

Name	I/O	Type	Description
in	input	xreal	optical input

Parameters

Name	Type	Default	Unit	Description
Zrel	real	1.0	None	relative characteristic impedance