Optical Transmitter Design

Optical Communication System Design

Optical System - Figure 1 - Transmitter components

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 …

Optical System - Figure 2 - System performance with increased bit rate

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 …

Optical System - Figure 1 - Project layout

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 …

Optical System - Figure 2 - Initial electrical pulse

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 …

Optical System - Figure 1 -  Dual-drive system layout

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 …

Optical System - Figure 3 - Spectral distribution—resolution from 1nm

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 …

Optical System - Figure 2 -  L-I curve—Power vs bias

Semiconductor Laser L-I Curve

The Light – Current (L-I) curve characterizes the emission properties of a semiconductor laser as it shows the current that needs to be applied to obtain a certain amount of power. We will show a L-I curve of our laser rate …

Optical System - Figure 2 -  Laser Noise

Laser Noise and Linewidth

Laser Intensity Noise.osd (see Figure 1) shows the laser spectral in CW operation at several power levels.   Figure 1: Laser Intensity Noise  The laser exhibits fluctuations in its intensity, phase, and frequency, even when the laser is biased at a constant current …

Optical System - Figure 8 - LI curves The dotted line is the measurement

Vertical-Cavity Surface-Emitting Laser – VCSEL Validation

The purpose of this lesson is to compare the simulation results of the VCSEL laser component with the published articles [1] and [2]. The first part of the lesson will compare the LI and IV curves of the component for different …

Optical System - Figure 6 -  (a) Pulse intensity and (b) chirp

Using the Laser Measured Component

The purpose of this lesson is to demonstrate how to obtain the laser physical parameters from measurements. Case 1: Setting the measured values Z, Y, P1 and Ith to obtain the correspondent physical parameters: Using the measured values obtained in [1], set …

OptiSystem Manuals

VFEM Accuracy and Advantages

January 20, 2017

As optical systems move towards an integrated platform, the modelling of high refractive index contrast, sub-wavelength dimension…

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