OptiSystem Applications

Compensation of Dispersion with OptiGrating

Optical System - Figure 5 Grating Definition dialog box

This lesson demonstrates how OptiSystem can work with OptiGrating to design a proper dispersion compensation element in optical systems. The idea behind it is to use the additional possibilities provided by OptiGrating for design of fiber gratings. The physical idea behind this compensation is following: creating of a linear chirped grating allows us to create…

Dispersion Compensation Using Subsystems

Optical System - Figure 2 Signal evolution in a dispersion compensated link span

This lesson illustrates how to simulate a simple dispersion compensated link elaborating further the concepts of subsystem definition. Let us set up the following layout, which includes…

Maximum-Likelihood Sequence Estimation (MLSE) Equalizer

Optical System - Figure 1 OptiSystem component library

This project MLSE Application.osd demonstrates the application of the component ‘MLSE Equalizer’. The MLSE Equalizer component is available in the OptiSystem component library folder ‘Default/Receivers Library/Regenerators’ (Figure 1). Figure 1: OptiSystem component library The system layout is presented in Figure 2. A 10 GB/s BPSK signal is generated by the ‘BPSK Generator’ component. The signal…

DFE – Decision-Feedback Equalizer

Optical System - Figure 4 Error level during training

Project DFE Application.osd demonstrates the application of the component ‘Electronic Equalizer”. The Electronic Equalizer component is available in the OptiSystem component library folder ‘Default/Receivers Library/Regenerators’ (Figure 1). Figure 1: OptiSystem component library The system layout is presented in Figure 2. A 10 GB/s BPSK signal is generated by the ‘BPSK Generator’ component. The signal is…

Dispersion Compensation Using Electronic Equalization

Optical System - Figure 2 Eye diagram before and after the equalizer

Project Equalizer GVD.osd demonstrates the application of the equalizer in an optical link (Figure 1). Figure 2 depicts the eye diagram before and after dispersion compensation. Figure 1: GVD compensation Figure 2: Eye diagram before and after the equalizer

Lightwave System Components

Optical System - Figure 1 Lightwave System Components

FOCS Introduction Lightwave System Components.osd details a generic block diagram of an optical communication system. An optical communication system consists of a: •transmitter •communication channel •receiver…

Optimizing Power and Dispersion Compensation for Nonlinear RZ Transmission

Optical System - Figure 2 Eye diagram for RZ modulation with optimum parameters

In this tutorial we show an example of a maximization procedure. We will optimize the launch power and DCF length to maximize the Q factor at the receiver. Upgrading an existing noise-limited fiber plant requires an increase in launched power, which in turn brings the fiber nonlinearities. It has been shown that nonlinear return to…

10 Gb/s Single Channel Transmission in Standard Mode Fibers (SMF)

Optical System - Figure 2 Comparison of RZ and NRZ transmission

The fundamental limitation to high-speed communication systems over the embedded standard single-mode fiber at 1.55 µm is the linear chromatic dispersion. Typical value of β2  = –20ps2 / km at 1.55 µm for SMF leads to D=16 ps/(nm.km). For bit rate B = 10 Gb/s, the slot duration is TB = 100 ps. If we…

40 Gb/s Single Channel Transmission in Standard Mode Fibers (SMF)

Optical System Figure 5 Transmission distance 500 km at 40 Gbs

The fundamental limitation to high- speed communication systems over the embedded standard single-mode fiber at 1.55 mm is the linear chromatic dispersion. Typical value of β2  = –20ps2/km at 1.55 µm for SMF leads to D=16 ps/(nm.km). For bit rate B = 40 Gb/s, the slot duration will be TB = 25 ps. If we…

Engineering the Fiber Nonlinearities and Dispersion

Optical System - Figure 1 Eye diagrams of the received signal for several received signal powers when system residual dispersion is a) 0, b) 800 psnm.

The purpose of this example is to investigate the fiber nonlinearity and dispersion related issues in a system.
As long as the optical power within an optical fiber is small, the fiber can be treated as linear medium. However, when the power level is high, we have to consider the impact of nonlinear effects.