The link consists of the following sub-components: a transmitter consisting of a 1310-nm externally modulated laser driven by a PRBS-modulated electrical signal, a Spatial Coupler that simulates misalignment of the transmitter and rib waveguide, the rib waveguide, simulated via a call to BeamPROP using the Spatial BeamPROP Interface, another Coupler to simulate any misalignment between the waveguide and multimode fiber, 300 meters of 50-micron multimode fiber, and a receiver, coupled to the multimode fiber via another Coupler.
Of particular interest in this topology is the impact of the waveguide on the overall link performance. For example, how does the link BER vary as a function of transmitter-waveguide alignment or the transmitter output beam's spot-size parameter? To answer these questions, we will make use of ModeSYS's Scan capabilities and scan for the spot-size. The corresponding BER plots are shown below: