Detectivity of Photodetector Calculator

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Optical Detectors

C-V Actions of Optics Transmission

Fiber Optic Parameters

Transmission Measurements

✖Noise Equivalent Power measures the minimum detectable power or intensity of radiation, taking into account the inherent noise in the detector system.ⓘ Noise Equivalent Power [NEP]

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✖Detectivity quantifies the device's ability to detect weak optical signals while considering its noise characteristics.ⓘ Detectivity of Photodetector [D]

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Formula

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Detectivity of Photodetector

Formula

`"D" = 1/"NEP"`

Example

`"0.125"=1/"8W"`

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Detectivity of Photodetector Solution

STEP 0: Pre-Calculation Summary

Formula Used

Detectivity = 1/Noise Equivalent Power
D = 1/NEP
This formula uses 2 Variables

Variables Used

Detectivity - Detectivity quantifies the device's ability to detect weak optical signals while considering its noise characteristics.
Noise Equivalent Power - (Measured in Watt) - Noise Equivalent Power measures the minimum detectable power or intensity of radiation, taking into account the inherent noise in the detector system.

STEP 1: Convert Input(s) to Base Unit

Noise Equivalent Power: 8 Watt --> 8 Watt No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

D = 1/NEP --> 1/8

Evaluating ... ...

D = 0.125

STEP 3: Convert Result to Output's Unit

0.125 --> No Conversion Required

FINAL ANSWER

0.125 <-- Detectivity

(Calculation completed in 00.020 seconds)

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Home » Engineering » Electronics » Fiber Optic Transmission » Optical Detectors » Detectivity of Photodetector

Credits

Created by Santhosh Yadav

Dayananda Sagar College Of Engineering (DSCE), Banglore

Santhosh Yadav has created this Calculator and 50+ more calculators!

Verified by Parminder Singh

Chandigarh University (CU), Punjab

Parminder Singh has verified this Calculator and 600+ more calculators!

< 25 Optical Detectors Calculators

SNR of Good Avalanche Photodiode ADP Receiver in decibels

Go Signal to Noise Ratio = 10*log10((Multiplication Factor^2*Photocurrent^2)/(2*[Charge-e]*Post Detection Bandwidth*(Photocurrent+Dark Current)*Multiplication Factor^2.3+((4*[BoltZ]*Temperature*Post Detection Bandwidth*1.26)/Load Resistance)))

Photocurrent due to Incident Light

Go Photocurrent = (Incident Power*[Charge-e]*(1-Reflection Coefficient))/([hP]*Frequency Of Incident Light)*(1-exp(-Absorption Coefficient*Width of Absorption Region))

Probability of Detecting Photons

Go Probability of Finding a Photon = ((Variance of Probability Distribution Function^(Number of Incident Photons))*exp(-Variance of Probability Distribution Function))/(Number of Incident Photons!)

Excess Avalanche Noise Factor

Go Excess Avalanche Noise Factor = Multiplication Factor*(1+((1-Impact Ionization Coefficient)/Impact Ionization Coefficient)*((Multiplication Factor-1)/Multiplication Factor)^2)

Total Photodiode Current

Go Output Current = Dark Current*(exp(([Charge-e]*Photodiode Voltage)/(2*[BoltZ]*Temperature))-1)+Photocurrent

Optical Gain of Phototransistors

Go Optical Gain of Phototransistor = (([hP]*[c])/(Wavelength of Light*[Charge-e]))*(Collector Current of Phototransistor/Incident Power)

Average Number of Photons Detected

Go Average Number Of Photons Detected = (Quantum Efficiency*Average Received Optical Power*Time Period)/(Frequency Of Incident Light*[hP])

Single Pass Phase Shift through Fabry-Perot Amplifier

Go Single-Pass Phase Shift = (pi*(Frequency Of Incident Light-Fabry–Perot Resonant Frequency))/Free Spectral Range of Fabry-Pérot Interferometer

Total Root Mean Square Noise Current

Go Total Root Mean Square Noise Current = sqrt(Total Shot Noise^2+Dark Current Noise^2+Thermal Noise Current^2)

Average Received Optical Power

Go Average Received Optical Power = (20.7*[hP]*Frequency Of Incident Light)/(Time Period*Quantum Efficiency)

Total Power Accepted by Fiber

Go Total Power Accepted by Fiber = Incident Power*(1-(8*Axial Displacement)/(3*pi*Radius of Core))

Multiplied Photocurrent

Go Multiplied Photocurrent = Optical Gain of Phototransistor*Responsivity of Photodetector*Incident Power

Temperature Effect on Dark Current

Go Dark Current in raised temperature = Dark Current*2^((Changed Temperature-Previous Temperature)/10)

Incident Photon Rate

Go Incident Photon Rate = Incident Optical Power/([hP]*Frequency Of Light Wave)

Maximum Photodiode 3 dB Bandwidth

Go Maximum 3db Bandwidth = Carrier Velocity/(2*pi*Depletion Layer Width)

Maximum 3dB Bandwidth of Metal Photodetector

Go Maximum 3db Bandwidth = 1/(2*pi*Transit Time*PhotoConductive Gain)

Bandwidth Penalty

Go Post Detection Bandwidth = 1/(2*pi*Load Resistance*Capacitance)

Long Wavelength Cutoff Point

Go Wavelength Cutoff Point = [hP]*[c]/Bandgap Energy

Quantum Efficiency of Photodetector

Go Quantum Efficiency = Number of Electrons/Number of Incident Photons

Multiplication Factor

Go Multiplication Factor = Output Current/Initial Photocurrent

Electron Rate in Detector

Go Electron Rate = Quantum Efficiency*Incident Photon Rate

Transit Time with respect to Minority Carrier Diffusion

Go Diffusion Time = Distance^2/(2*Diffusion Coefficient)

Longest Transit Time

Go Transit Time = Depletion Layer Width/Drift Velocity

3 dB Bandwidth of Metal Photodetectors

Go Maximum 3db Bandwidth = 1/(2*pi*Transit Time)

Detectivity of Photodetector

Go Detectivity = 1/Noise Equivalent Power

Detectivity of Photodetector Formula

Detectivity = 1/Noise Equivalent Power
D = 1/NEP

What is the significance of detectivity of photodetector?

Detectivity is a critical parameter for photodetectors, measuring their ability to detect weak optical signals while considering noise. It is crucial in applications like astronomy, environmental monitoring, medical imaging, and security systems.

How to Calculate Detectivity of Photodetector?

Detectivity of Photodetector calculator uses Detectivity = 1/Noise Equivalent Power to calculate the Detectivity, Detectivity of photodetector is a figure of merit used to evaluate its ability to detect weak optical signals while considering both its sensitivity and the noise characteristics. Detectivity is denoted by D symbol.

How to calculate Detectivity of Photodetector using this online calculator? To use this online calculator for Detectivity of Photodetector, enter Noise Equivalent Power (NEP) and hit the calculate button. Here is how the Detectivity of Photodetector calculation can be explained with given input values -> 0.125 = 1/8.

FAQ

What is Detectivity of Photodetector?

Detectivity of photodetector is a figure of merit used to evaluate its ability to detect weak optical signals while considering both its sensitivity and the noise characteristics and is represented as D = 1/NEP or Detectivity = 1/Noise Equivalent Power. Noise Equivalent Power measures the minimum detectable power or intensity of radiation, taking into account the inherent noise in the detector system.

How to calculate Detectivity of Photodetector?

Detectivity of photodetector is a figure of merit used to evaluate its ability to detect weak optical signals while considering both its sensitivity and the noise characteristics is calculated using Detectivity = 1/Noise Equivalent Power. To calculate Detectivity of Photodetector, you need Noise Equivalent Power (NEP). With our tool, you need to enter the respective value for Noise Equivalent Power and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

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