Modal Rise Time Calculator

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Transmission Measurements

C-V Actions of Optics Transmission

Fiber Optic Parameters

Optical Detectors

✖Length Of Cable is the usually the measurement used to measure how long the cable is.ⓘ Length Of Cable [L₁]			+10% -10%
✖Modal Dispersion Bandwidth refers to the frequency range over which modal dispersion has a significant effect on signal transmission.ⓘ Modal Dispersion Bandwidth [B_mod]			+10% -10%

✖Modal Rise Time refers to the time it takes for the optical signal to rise from its initial intensity level to a specified percentage of its peak intensity as it travels through an optical fiber.ⓘ Modal Rise Time [t_mod]

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Formula

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Modal Rise Time

Formula

`"t"_{"mod"} = (440*"L"_{"1"})/"B"_{"mod"}`

Example

`"39.80198s"=(440*"2.01m")/"22.22Hz"`

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Modal Rise Time Solution

STEP 0: Pre-Calculation Summary

Formula Used

Modal Rise Time = (440*Length Of Cable)/Modal Dispersion Bandwidth
t_mod = (440*L₁)/B_mod
This formula uses 3 Variables

Variables Used

Modal Rise Time - (Measured in Second) - Modal Rise Time refers to the time it takes for the optical signal to rise from its initial intensity level to a specified percentage of its peak intensity as it travels through an optical fiber.
Length Of Cable - (Measured in Meter) - Length Of Cable is the usually the measurement used to measure how long the cable is.
Modal Dispersion Bandwidth - (Measured in Hertz) - Modal Dispersion Bandwidth refers to the frequency range over which modal dispersion has a significant effect on signal transmission.

STEP 1: Convert Input(s) to Base Unit

Length Of Cable: 2.01 Meter --> 2.01 Meter No Conversion Required
Modal Dispersion Bandwidth: 22.22 Hertz --> 22.22 Hertz No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

t_mod = (440*L₁)/B_mod --> (440*2.01)/22.22

Evaluating ... ...

t_mod = 39.8019801980198

STEP 3: Convert Result to Output's Unit

39.8019801980198 Second --> No Conversion Required

FINAL ANSWER

39.8019801980198 ≈ 39.80198 Second <-- Modal Rise Time

(Calculation completed in 00.004 seconds)

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Home » Engineering » Electronics » Fiber Optic Transmission » Transmission Measurements » Modal Rise Time

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

Modal Rise Time Formula

Modal Rise Time = (440*Length Of Cable)/Modal Dispersion Bandwidth
t_mod = (440*L₁)/B_mod

Why is Modal Rise Time important?

Modal rise time is important in optical fiber communication systems as it characterizes the time it takes for different modes (individual light paths) within a multimode optical fiber to arrive at the receiver.

How to Calculate Modal Rise Time?

Modal Rise Time calculator uses Modal Rise Time = (440*Length Of Cable)/Modal Dispersion Bandwidth to calculate the Modal Rise Time, Modal rise time is a term used in the context of optical fiber communications. It refers to the time it takes for the optical signal to rise from its initial intensity level to a specified percentage (often 10% or 90%) of its peak intensity as it travels through an optical fiber. Modal Rise Time is denoted by t_mod symbol.

How to calculate Modal Rise Time using this online calculator? To use this online calculator for Modal Rise Time, enter Length Of Cable (L₁) & Modal Dispersion Bandwidth (B_mod) and hit the calculate button. Here is how the Modal Rise Time calculation can be explained with given input values -> 39.80198 = (440*2.01)/22.22.

FAQ

What is Modal Rise Time?

Modal rise time is a term used in the context of optical fiber communications. It refers to the time it takes for the optical signal to rise from its initial intensity level to a specified percentage (often 10% or 90%) of its peak intensity as it travels through an optical fiber and is represented as t_mod = (440*L₁)/B_mod or Modal Rise Time = (440*Length Of Cable)/Modal Dispersion Bandwidth. Length Of Cable is the usually the measurement used to measure how long the cable is & Modal Dispersion Bandwidth refers to the frequency range over which modal dispersion has a significant effect on signal transmission.

How to calculate Modal Rise Time?

Modal rise time is a term used in the context of optical fiber communications. It refers to the time it takes for the optical signal to rise from its initial intensity level to a specified percentage (often 10% or 90%) of its peak intensity as it travels through an optical fiber is calculated using Modal Rise Time = (440*Length Of Cable)/Modal Dispersion Bandwidth. To calculate Modal Rise Time, you need Length Of Cable (L₁) & Modal Dispersion Bandwidth (B_mod). With our tool, you need to enter the respective value for Length Of Cable & Modal Dispersion Bandwidth 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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