OptiSystem Applications

System Design – Power Budget

Optical System - Figure 4 Power Budget

The purpose of power budget is to ensure that enough power will reach the receiver to maintain reliable performance during the entire system lifetime. The minimum average power required by the receiver is the receiver sensitivity. The average launch power is generally specified for each transmitter with optical powers expressed in dBm. In order to…

Time Division Multiplexing (TDM)

Optical System - Figure 8 OTDM 10 GBs - Receiver

In optical time-division multiplexing (OTDM) systems, several optical signal modulated at the bit rate B using the same carrier frequency are multiplexed optically to form a composite optical signal at a bit rate NB, where N is the number of multiplexed optical channels. OTDM Multiplexer.osd (see Figure 5) shows an OTDM transmitter.

Broadband Optical System Based on a Passive Optical Network (BPON)

The system designed in project BPON Bidirectional.osd (Figure 1) provides a 622 Mbps of bidirectional access to multiple sites over a single fiber. It consists of an Optical Line Termination (OLT) at the service provider’s central office and 8 Optical Network Units (ONUs) near end users. Figure 1: Broadband passive optical network

Optical Code-Division Multiple-Access System (OCDMA)

Optical System - Figure 1 OCDMA system

The system designed in project SAC OCDMA.osd (Figure 1) is a spectral-amplitude-coding OCDMA. It has three users, where in this setup two users are transmitting data, while one user is off. The FBGs in the system are working as enconders/decoders for the incoherent optical signal.

Free Space Optics (FSO)

Optical System - Figure 1 FSO Link

Free Space Optics (FSO) communications [1] refers to the transmission of modulated visible or infrared beams through the atmosphere to obtain optical communications. FSO.osd (Figure 1) demonstrates a typical free space optical link operating at 1.25 GB/s, where usually the main source of penalty is the atmospheric attenuation.

Coherent Optical Transmission

Coherent 4 QAM.osd (Figure 1) demonstrates a 10 Gbps 4-QAM coherent optical system transmission over 100 km of fiber using homodyne detection.

Radio Over Fiber (RoF)

Optical System - Figure 1 SCM ASK Link

Radio over Fiber SCM ASK.osd (Figure 1) demonstrates the use of a subcarrier multiplexing (SCM) architecture to transmit several analog channels and one digital amplitude-shift keying (ASK) signal in a bidirectional setup.

Optical Time Domain Multiplexing (OTDM) Design

Optical System - Figure 3 (a) Initial bit sequence

The objective of this lesson is to demonstrate the possibility of simulating a packet-interleaved operation using OptiSystem.
In this case, the data stream externally modulates a periodic stream of narrow pulses.
Because the bit interval is T, the separation between successive pulses is also T.

System Performance Analysis Using Script Automation

Optical System - Figure 1 System layout

The objective of this lesson is to demonstrate the performance analysis of a system using the script page to vary the system parameters and store the results.
Sometimes, to analyze the system performance, several parameters in the system are varied and the results for each different configuration have to be stored.

BER Calculation Using the BER Test Set

Optical System - Figure 1 System layout with BER estimated

This example demonstrates the use of a BER test set component to calculate the system performance. Samples: NRZ_BERestimation.osd NRZ_BERcalculation.osd Fig. 1 shows the system layout designed that will have its performance evaluated. For an initial estimation on the BER value, a BER analyzer is used to estimate the bit error rate based on a Gaussian…