Access Networks

Power Level Management in Optical Metro Networks

Design without amplification  In this example, our goal is to design a basic transparent ring network without amplification and discover the power related issues.   Metro networks using ring topology are expected to have more dynamic traffic patterns compared to most long-haul networks. They are also expected to have optically transparent nodes with a minimum…

Migrating to 10Gbps in Metro Networks

In this example, we will investigate the issues at high data bit rate, particularly 10 Gbps (OC-192) systems in metro area ring networks. At higher bit rates, in addition to loss compensation, we may also need to consider the chromatic dispersion compensation. Different options related to dispersion and initial chirp will be investigated. For this case,…

Negative Dispersion Fiber for Metro Networks

In this example, we compare two types of fibers, Corning’s MetroCor and SMF-28 fibers for metro network applications. MetroCor Fiber has a negative dispersion, whereas SMF-28 has a positive dispersion in the EDFA bands. Dispersion characteristics of these two fibers are shown in Figure 1. For metro applications, directly modulated lasers (DMLs) are preferred because…

Interchannel Crosstalk in Metro Networks

A particular signal can accumulate cross-talk from different elements and channels over the network. Cross-talk can be reduced by using several techniques such as wavelength dilation or filter cascading. In this example, we will investigate the effect of interchannel cross-talk at ADM to a ring network.

WDM Ring – Wavelength Independent Subscriber Equipment

In this example, we will show realization of a WDM ring network using wavelength independent subscriber equipment to share bandwidth [1]. The metro-ring network we modeled operates with 2 wavelength carriers as shown in Figure 1. In this configuration, several subscribers share the bandwidth. For illustration purposes, the network contains one Network Node (NN) and one…

Using OptiSystem to analyze CATV systems

The aim of this material is to show the possibilities of using OptiSystem to analyze CATV systems.
In Part I, we demonstrate the basic nonlinear distortions that result from the propagation of the multiple carrier frequencies through a laser diode.
Observation of harmonic and intermodal products is presented. Although the appearance of the nonlinear distortions is a deterministic process, it is considered to contribute to the laser noise.

FTTH (Fiber To The Home)

FTTH: OCDMA Network Layout

A broadband access network offers various high-speed services to the end-user such as internet, multimedia, tele-medicine and distant learning…

OCDMA Network Design

Represents the Eye Diagram, BER, and Q-Factor for User 1.

Optical Code-Division Multiple-Access (OCDMA) system simulation is crucial for optical engineers designing networks that require high levels of privacy and security. This Application Note describes how OptiSystem simulates such a network.

Analysis and Simulation on Spectral Phase-Encoded OCDMA System (subscription required)

This paper analyzes the temporal behavior of pseudo-random code and the effects on a spectral phase-encoded time-spreading OCDMA System. A spectral phase-encoded time-spreading optical code division multiple access system designed by Optiwave’s Optisystem was demonstrated.

Design and simulation of a novel phase-encoded OCDMA system

The security of optical code division multi-access (OCDMA) system was analyzed, and the results indicate the hidden trouble of security. A scheme of multi-codes to be transmitted single-user information has been proposed, and single-user eavesdropping model has been simulated.