Optical Return Loss Calculator

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Transmission Measurements

C-V Actions of Optics Transmission

Fiber Optic Parameters

Optical Detectors

✖Output Power is the measurement of power at output side in a four-port coupler.ⓘ Output Power [P_out]			+10% -10%
✖Reflected Power is the power incident on the reflector in a four port coupler.ⓘ Reflected Power [P_ref]			+10% -10%
✖Source Power is the measurement of the power at the input side.ⓘ Source Power [P_in]			+10% -10%
✖Power at Port 2 is the measurement of power at port 2.ⓘ Power at Port 2 [P_r]			+10% -10%
✖Power at Port 4 is the power measured at the port 4 of the 4 port coupler.ⓘ Power at Port 4 [P_c]			+10% -10%

✖Optical Return Loss (ORL) is a measure of the amount of light reflected back toward the source in an optical communication system, such as in optical fibers or other optical components.ⓘ Optical Return Loss [ORL]

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Formula

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Optical Return Loss

Formula

`"ORL" = 10*log10(("P"_{"out"}*"P"_{"ref"})/("P"_{"in"}*("P"_{"r"}-"P"_{"c"})))`

Example

`"12.21338dB/m"=10*log10(("13.011W"*"13.3W")/("13.01W"*("6.3W"-"5.501W")))`

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Optical Return Loss Solution

STEP 0: Pre-Calculation Summary

Formula Used

Optical Return Loss = 10*log10((Output Power*Reflected Power)/(Source Power*(Power at Port 2-Power at Port 4)))
ORL = 10*log10((P_out*P_ref)/(P_in*(P_r-P_c)))
This formula uses 1 Functions, 6 Variables

Functions Used

log10 - The common logarithm, also known as the base-10 logarithm or the decimal logarithm, is a mathematical function that is the inverse of the exponential function., log10(Number)

Variables Used

Optical Return Loss - (Measured in Decibel per Meter) - Optical Return Loss (ORL) is a measure of the amount of light reflected back toward the source in an optical communication system, such as in optical fibers or other optical components.
Output Power - (Measured in Watt) - Output Power is the measurement of power at output side in a four-port coupler.
Reflected Power - (Measured in Watt) - Reflected Power is the power incident on the reflector in a four port coupler.
Source Power - (Measured in Watt) - Source Power is the measurement of the power at the input side.
Power at Port 2 - (Measured in Watt) - Power at Port 2 is the measurement of power at port 2.
Power at Port 4 - (Measured in Watt) - Power at Port 4 is the power measured at the port 4 of the 4 port coupler.

STEP 1: Convert Input(s) to Base Unit

Output Power: 13.011 Watt --> 13.011 Watt No Conversion Required
Reflected Power: 13.3 Watt --> 13.3 Watt No Conversion Required
Source Power: 13.01 Watt --> 13.01 Watt No Conversion Required
Power at Port 2: 6.3 Watt --> 6.3 Watt No Conversion Required
Power at Port 4: 5.501 Watt --> 5.501 Watt No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

ORL = 10*log10((P_out*P_ref)/(P_in*(P_r-P_c))) --> 10*log10((13.011*13.3)/(13.01*(6.3-5.501)))

Evaluating ... ...

ORL = 12.2133824195993

STEP 3: Convert Result to Output's Unit

12.2133824195993 Decibel per Meter --> No Conversion Required

FINAL ANSWER

12.2133824195993 ≈ 12.21338 Decibel per Meter <-- Optical Return Loss

(Calculation completed in 00.004 seconds)

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Home » Engineering » Electronics » Fiber Optic Transmission » Transmission Measurements » Optical Return Loss

Credits

Created by Santhosh Yadav

Dayananda Sagar College Of Engineering (DSCE), Banglore

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

Verified by Ritwik Tripathi

Vellore Institute of Technology (VIT Vellore), Vellore

Ritwik Tripathi has verified this Calculator and 100+ more calculators!

< 20 Transmission Measurements Calculators

Time Constant of Calorimeter

Go Time Constant = (Time Instance 2-Time Instance 1)/(ln(Maximum Temperature Rise-Temperature At Time t1)-ln(Maximum Temperature Rise-Temperature At Time t2))

Optical Attenuation

Go Attenuation Per Unit Length = 10/(Length Of Cable-Cut Length)*log10(Photoreceiver Voltage At Cut Length/Photoreceiver Voltage At Full Length)

Optical Return Loss

Go Optical Return Loss = 10*log10((Output Power*Reflected Power)/(Source Power*(Power at Port 2-Power at Port 4)))

Guided Modes Number

Go Guided Modes Number = ((pi*Radius of Core)/Wavelength of Light)^2*(Refractive Index of Core^2-Refractive Index of Cladding^2)

Bit Error Rate given SNR

Go Bit Error Rate = (1/sqrt(2*pi))*(exp(-Signal to Noise Ratio of Photodetector^2/2))/Signal to Noise Ratio of Photodetector

Fiber Rise Time

Go Fiber Rise Time = modulus(Chromatic Dispersion Coefficient)*Length Of Cable*Half Power Spectral Width

Ideal Etalon Transmission

Go Transmission of Etalon = (1+(4*Reflectivity)/(1-Reflectivity)^2*sin(Single-Pass Phase Shift/2)^2)^-1

3dB Pulse Broadening

Go 3dB Pulse Broadening = sqrt(Optical Output Pulse^2-Optical Input Pulse^2)/(Length Of Cable)

Absorption Loss

Go Absorption Loss = (Thermal Capacity*Maximum Temperature Rise)/(Optical Power*Time Constant)

Free Spectral Range of Etalon

Go Free Spectral Range Wavelength = Wavelength of Light^2/(2*Refractive Index of Core*Slab Thickness)

Scattering Loss

Go Scattering Loss = ((4.343*10^5)/Fiber Length)*(Constant Output Optical Power/Output Optical Power)

Refractive Index Difference

Go Difference Refractive Index = (Fringe Displacements Number*Wavelength of Light)/Slab Thickness

Pulse Spreading Time

Go Pulse Spreading Time = Polarisation Mode Dispersion Coefficient*sqrt(Length Of Cable)

Finesse of Etalon

Go Finesse = (pi*sqrt(Reflectivity))/(1-Reflectivity)

Power Penalty

Go Power Penalty = -10*log10((Extinction Ratio-1)/(Extinction Ratio+1))

Relative Attenuation

Go Relative Attenuation = 10*log10(Total Power/Spectral Power)

Bend Attenuation

Go Bend Attenuation = 10*log10(Total Power/Small Power)

Modal Rise Time

Go Modal Rise Time = (440*Length Of Cable)/Modal Dispersion Bandwidth

Optical Modulation Index

Go Modulation Index = Incident Power/Optical Power at Bias Current

Receiver Front End Rise Time

Go Received Rise Time = 350/Receiver Bandwidth

Optical Return Loss Formula

Optical Return Loss = 10*log10((Output Power*Reflected Power)/(Source Power*(Power at Port 2-Power at Port 4)))
ORL = 10*log10((P_out*P_ref)/(P_in*(P_r-P_c)))

Why is ORL needed?

Optical Return Loss (ORL) is crucial in optical systems as it quantifies the amount of light reflected back towards the source. High ORL can cause signal degradation and interfere with data transmission. Maintaining a low ORL is essential for minimizing signal loss, ensuring data integrity, and optimizing the performance of optical networks.

How to Calculate Optical Return Loss?

Optical Return Loss calculator uses Optical Return Loss = 10*log10((Output Power*Reflected Power)/(Source Power*(Power at Port 2-Power at Port 4))) to calculate the Optical Return Loss, Optical Return Loss (ORL) is a measure of the amount of optical power that is reflected back toward the source in an optical system, typically expressed in decibels (dB). In the context of a four-port optical coupler, such as a fiber optic coupler or splitter, ORL refers to the amount of optical power that is reflected back into one or more of the input ports when light is coupled into the device. Optical Return Loss is denoted by ORL symbol.

How to calculate Optical Return Loss using this online calculator? To use this online calculator for Optical Return Loss, enter Output Power (P_out), Reflected Power (P_ref), Source Power (P_in), Power at Port 2 (P_r) & Power at Port 4 (P_c) and hit the calculate button. Here is how the Optical Return Loss calculation can be explained with given input values -> 12.21338 = 10*log10((13.011*13.3)/(13.01*(6.3-5.501))).

FAQ

What is Optical Return Loss?

Optical Return Loss (ORL) is a measure of the amount of optical power that is reflected back toward the source in an optical system, typically expressed in decibels (dB). In the context of a four-port optical coupler, such as a fiber optic coupler or splitter, ORL refers to the amount of optical power that is reflected back into one or more of the input ports when light is coupled into the device and is represented as ORL = 10*log10((P_out*P_ref)/(P_in*(P_r-P_c))) or Optical Return Loss = 10*log10((Output Power*Reflected Power)/(Source Power*(Power at Port 2-Power at Port 4))). Output Power is the measurement of power at output side in a four-port coupler, Reflected Power is the power incident on the reflector in a four port coupler, Source Power is the measurement of the power at the input side, Power at Port 2 is the measurement of power at port 2 & Power at Port 4 is the power measured at the port 4 of the 4 port coupler.

How to calculate Optical Return Loss?

Optical Return Loss (ORL) is a measure of the amount of optical power that is reflected back toward the source in an optical system, typically expressed in decibels (dB). In the context of a four-port optical coupler, such as a fiber optic coupler or splitter, ORL refers to the amount of optical power that is reflected back into one or more of the input ports when light is coupled into the device is calculated using Optical Return Loss = 10*log10((Output Power*Reflected Power)/(Source Power*(Power at Port 2-Power at Port 4))). To calculate Optical Return Loss, you need Output Power (P_out), Reflected Power (P_ref), Source Power (P_in), Power at Port 2 (P_r) & Power at Port 4 (P_c). With our tool, you need to enter the respective value for Output Power, Reflected Power, Source Power, Power at Port 2 & Power at Port 4 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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