OptiSystem Applications

Validation of FWM Effect

This tutorial demonstrates the validity of the FWM algorithm, as well as providing the user with some useful designing tips for optimizing simulation time and accuracy. The layout in was used to obtain results, and can be found in the sample file FWM Validation.osd Figure 1: FWM project layout In the two CW Lasers, the…

Stimulated Raman Scattering

This lesson demonstrates the light amplification caused by the stimulated Raman scattering effect. The layout and its global parameters are shown in Figure 1. Figure 1: Layout and global parameters Figure 2 shows the setup for the optical fiber component. Figure 2: Setup parameters The spectrum of the input signal consists of a strong pump…

Stimulated Raman Scattering—Separated Channels

The purpose of this lesson is to demonstrate light amplification resulting from the stimulated Raman scattering effect. The layout with its global parameters is shown in Figure 1 Figure 1: Layout and global parameters The input spectrum (Figure 2) consists of a strong (pump) wave at 193 THz (100W) and four weak (probe) waves at…

SPM-Induced Spectral Broadening

This lesson demonstrates the basic effects of self-phase modulation (SPM) on pulse propagation. These include: Pulse chirping Pulse spectral broadening The effects SPM of are described by [1]: where E(z, t) is the electric field envelope, and the parameter y is given by: In Equation 2, ω0 is the carrier (or reference) frequency, n2 is…

XPM-Induced Asymmetric Spectral Broadening

The purpose of this lesson is to demonstrate the asymmetric spectral broadening caused by XPM. The layout along with the global parameters are shown in Figure 1. Figure 1: Layout and global parameters The input consists of two superimposed Gaussian pulses [1] (Figure 2). Figure 2: Superimposed Gaussian pulses The carrier wavelengths of the pulses…

Kerr Shutter

The purpose of this lesson is to demonstrate that the Kerr effect in optical fibers can be used to produce ultra-fast all-optical switch (shutter).

Bidirectional Fiber and Raman Design

The objective of this lesson is to demonstrate a distributed Raman fiber design. Initially, the system described in Figure 1 was designed. The system consists of 64 channels at 10 Gbits/s propagating for a 50 km SMF-28 fiber. The attenuation in the fiber is compensated by the Raman amplification due to the 4 backward laser…

Modulation Formats

The first step in the design of an optical communication systems is to decide how the electrical signal should be converted into an bit stream. There are two typical choices for the modulation format of the signal: return-to-zero (RZ) nonreturn-to-zero (NRZ) Examples of the modulation formats are shown in Figure 1. Figure 1: Modulation Formats…

Extracting the Thermal Noise Parameter for a Specific Receiver Sensitivity

In this tutorial, we provide a basic example of Goal Attainment optimizations. In this example we will use the optimization tool in the context of parameter extraction. Thermal noise parameter of PIN will be extracted to get a receiver sensitivity of -17 dBm. The design layout is shown in Figure 1. The transmitter power is…

Receiver Noise—PIN

There are two fundamental noise mechanisms in a photodetector: shot noise thermal noise Receiver Shot and Thermal noise.osd details the signal degraded by thermal and shot noise in the PIN photodetector. The low-pass filter has a cutoff frequency with the same value as the bit rate. Figure 1: Receiver Shot and Thermal noise The upper…