Optical Receiver Design

Optical Communication System Design

Optical System - Figure 3 - NRZ - Frequency

Modulation Formats

The first step in the design of an optical communication systems is to decide how the electrical signal should be converted into an bit stream. There are two typical choices for the modulation format of the signal: return-to-zero (RZ) nonreturn-to-zero …

Optical System - Figure 2 - Thermal noise factor of PIN is 5E-22 W Hz with received average signal power -17 dBm

Extracting the Thermal Noise Parameter for a Specific Receiver Sensitivity

In this tutorial, we provide a basic example of Goal Attainment optimizations. In this example we will use the optimization tool in the context of parameter extraction. Thermal noise parameter of PIN will be extracted to get a receiver sensitivity …

Optical System - Figure 1 - Receiver Shot and Thermal noise

Receiver Noise—PIN

There are two fundamental noise mechanisms in a photodetector: shot noise thermal noise   Receiver Shot and Thermal noise.osd details the signal degraded by thermal and shot noise in the PIN photodetector. The low-pass filter has a cutoff frequency with …

Optical System - Figure 4 -  Q factor x APD Gain

Receiver Noise—Shot Noise Enhancement with APD

Optical receivers with APD generally provide a higher SNR for the same incident optical power. The improvement in the SNR is due to the internal gain that increases the photocurrent by the multiplication factor M.     Figure 1: Receiver …

Optical System - Figure - 2 - BER x Attenuation

Receiver Sensitivity—Bit Error Rate (BER)

The performance criteria for digital receivers if governed by the bit-error-rate (BER), defined as the probability of incorrect identification of a bit by the decision circuit of the receiver. Receiver BER – Q factor.osd shows the BER and Q factor …

Optical System - Figure 3 - Power APD

Receiver sensitivity—Minimum input power

This example shows the minimum optical power that a receiver needs to operate reliably with a BER below a specific value (see Figure 1). In this example, you calculate this input power by targeting a BER of 10-9, a Q …

Optical System - Figure 2 - Q factor x ER

Sensitivity degradation—Extinction ratio

A simple source of power penalty is related to the energy carried by 0 bits. Some power is emitted by transmitters even in the off-state. Sensitivity Degradation – ER.osd includes an external modulated laser where you can specify the extinction …

Optical System - Figure 3 - Using histograms to measure jitter

Signal degradation – Jitter

Jitter is defined as the short-term variations of a digital signal’s significant instants from their ideal positions in time. Significant instants could be (for example) the optimum sampling instants. Project Signal Degradation – Jitter.osd (Figure 1) demonstrates the setup for …

Optical System - Figure 3 - (a) Input sequence and (b) output sequence recovered by PLL

Electrical PLL

The system demonstrates an electrical phase-locked loop.   Sample: EPLL.osd   The layout presented in the figure below is PLL system configured with a phase detector, a low pass filter and a voltage controlled oscillator. This example shows the response …

OptiSystem Manuals

AVFOP 2014 (Atlanta, Georgia USA)

November 11-13, 2014

AVFOP conference provides an indispensable international forum for the academic, industry, and government R&D…

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