Optical Amplifiers

SOA as a Wavelength Converter (XGM)

Optical System - Figure 10 Shape and spectrum of the signal at  = 1540 nm

This lesson demonstrates the application of traveling wave SOA as a wavelength converter using cross-gain saturation effect. The principle use of the cross-gain modulation in SOA is as an intensity-modulated input signal that modulates the gain in the SOA via gain saturation effect. A continuous wave signal at the selected output wavelength is modulated by…

SOA In-Line Amplifier

Optical System - Figure-9-SOA-pulse-patterns

One possible way to upgrade an existing network from previously installed standard optical fibers is to exploit the 1.3 mm optical window, where the step index fibers have a zero-dispersion wavelength using SOA. The advantages of using SOA as in-line single-channel optical amplifiers are: low dispersion of the SMF at this carrier wavelength attractive features…

Wideband SOA Characterization

Optical System - Figure 4 Noise spectra for different input signal powers

The objective of this lesson is to characterize a semiconductor optical amplifier (SOA) through simulations. Initially, we are going to characterize the SOA response to the variation in the input signal power. Figure 1 shows the system layout used in the simulation. We put the power parameter in the CW laser in sweep mode and…

Wavelength Conversion in a Wideband SOA

Optical System - Figure 3 Wavelength converted signal at 1550 nm

The objective of this lesson is to demonstrate the wavelength conversion using the wideband SOA component. Based on the results from the lesson “Wideband SOA Characterization”, we have designed a wavelength converter using the cross-gain modulation method. The system designed is shown in Figure 1. Figure 1: Wavelength converter system layout In the simulation, the…

Improved Gain in High-Concentration Er3+/Yb3+ Waveguide Amplifiers

Optical System - Figure 7 Signal gain versus Ytterbium concentration (Pp=200mW, Ps=1μ W, L=3cm, NEr=2.0 1026 ions m3)

This lesson will prove that we can achieve high gain with a short device length if we use a high-concentration Er3+/Yb3+ codoped glass waveguide amplifier. In this example, we simulate a codoped waveguide amplifier and show that the efficient Yb3+ to Er3+ energy transfer is a useful mechanism to reduce performance degradation due to Er3+…