OptiSystem Applications

Digital Modulation Analysis (FSK)

Digital modulation systems are used to transmit digital (quantized) information over a medium such as air or optical fiber. Transmission is achieved by mapping the information…

Fiber Optic Gyroscope (FOG) Systems Design

Fiber optic gyroscopes, using the Sagnac effect, can rapidly and accurately sense changes in orientation (angular velocity) from interferometric measurements. Two open loop detection techniques, DC and phase modulation, are demonstrated using OptiSystem.

OptiSystem C++ Component

OptiSystem’s Cpp Component, similar in operation to the MATLAB Component, allows users to create their own custom components. These are written in C++ and loaded into OptiSystem via dynamic link libraries (DLLs). The user has access to OptiSystem’s signal classes and an extensive library of convenience functions. Users can also create their own graphs and…

Matlab Binary Switch

These video tutorials will explain the protocol for setting up the MATLAB component in OptiSystem, by demonstrating a simple binary switch.

Optical Transmitters

The role of the optical transmitter is to: convert the electrical signal into optical form, and launch the resulting optical signal into the optical fiber. The optical transmitter consists of the following components: optical source electrical pulse generator optical modulator (see Figure 1). The launched power is an important design parameter, as indicates how much…

LED Modulation Response

The frequency response of an LED is determined by the carrier dynamics (and therefore is limited by the carrier lifetime Tn) and the parasitic capacitance of the LED (described by the RC constant TRC[2]. If a small, constant forward bias is applied, the influence of the parasitic capacitance of the LED can be neglected. The…

Semiconductor Laser Modulation Response

When using a directly modulated laser for high-speed transmission systems, the modulation frequency can be no larger than the frequency of the relaxation oscillations. The relaxation oscillation depends on both carrier lifetime and photon lifetime. The approximate expression of this dependence is given by: The relaxation oscillation frequency increases with the laser bias current. In…

Semiconductor Laser—Large Signal Modulation

The large-signal characteristics are related to the digital on/off switching of the laser diode. First, we will demonstrate the delay time required to achieve the population inversion to produce the gain. Second, we will demonstrate the typical for the direct modulation of semiconductor laser amplitude and phase modulations. For the laser which is completely turned…

Chirp in Mach-Zehnder Lithium Niobate Modulators

The objective of this lesson is to demonstrate the relation between the voltage applied to the modulator arms and the chirp in the output for MZ Lithium Niobate modulators. Chirp is a critical element in high bit rate lightwave systems because it can interfere in the limit of the system distance [1]. External modulators offer…

LED Spectral Distribution

The spectral distribution of the optical source determines the performance of the optical system through the dispersion [1], [2]. The spectral distribution of the LED is determined by the spectrum of spontaneous emission, which typically has a Gaussian shape. In the 1300-1500nm region, the spectral widths of the LED vary from 50 to 180nm. The…