Using OptiSystem to analyze CATV systems
The aim of this material is to show the possibilities of using OptiSystem to analyze CATV systems.
In Part I, we demonstrate the basic nonlinear distortions that result from the propagation of the multiple carrier frequencies through a laser diode.
Observation of harmonic and intermodal products is presented. Although the appearance of the nonlinear distortions is a deterministic process, it is considered to contribute to the laser noise.
Differential Mode Delay and Modal Bandwidth
For the differential mode delay measurement (DMD), an 850 nm probe is scanned at small radial increments across the core of the multimode fiber under test.
At each position the temporal response to a short impulse is recorded. After removal of the reference pulse temporal width, the DMD temporal width is determined at the 25% threshold level between the first leading edge and the last trailing edge of all traces encompassed between specified radial positions.
Encircled Flux
Encircled flux, as the name implies, describes the flux encircled within a circular radius inside the fiber.
Encircled flux is often quantified as the radius from the center of the fiber required to encircle 25% and 75% of the light energy through the fiber.
The power distribution of a fiber described by the encircled flux value is a crucial factor in ensuring the required data transmission rate in Gigabit Ethernet systems.
Matlab Cosimulation
BER Analysis Using Matlab®/OptiSystem Automation This example demonstrates the use of Matlab® software to call OptiSystem and calculate the bit error rate after the OptiSystem simulation. Samples: MatlabOptiSysBER.m OpticalLinkProject.osd The Matlab file “MatlabOptiSysBER.m” executes the following functions: Generates the data (sequences of bits) that are transmitted through OptiSystem; Opens OptiSystem; Load file OpticalLinkProject.osd that has…
OptiSPICE Netlist Component
This lesson describes how to create a transmitter using an external modulated laser. You will become familiar with the Component Library, the Main layout, component parameters, and visualizers.