Optical Modulation Index Calculator

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Transmission Measurements

C-V Actions of Optics Transmission

Fiber Optic Parameters

Optical Detectors

✖Incident Power w.r.t optics is the amount of optical power (light energy) incident on the photodetector.ⓘ Incident Power [P_o]			+10% -10%
✖Optical Power at Bias Current refers to the optical power output of a light source, such as a laser diode or an LED, when it is operating at a specific bias current.ⓘ Optical Power at Bias Current [P_bi]			+10% -10%

✖Modulation Index is defined as the amount by which the instantaneous power of the optical carrier varies around its average power.ⓘ Optical Modulation Index [m_opt]

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Formula

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Optical Modulation Index

Formula

`"m"_{"opt"} = "P"_{"o"}/"P"_{"bi"}`

Example

`"0.35"="1.75µW"/"5µW"`

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Optical Modulation Index Solution

STEP 0: Pre-Calculation Summary

Formula Used

Modulation Index = Incident Power/Optical Power at Bias Current
m_opt = P_o/P_bi
This formula uses 3 Variables

Variables Used

Modulation Index - Modulation Index is defined as the amount by which the instantaneous power of the optical carrier varies around its average power.
Incident Power - (Measured in Watt) - Incident Power w.r.t optics is the amount of optical power (light energy) incident on the photodetector.
Optical Power at Bias Current - (Measured in Watt) - Optical Power at Bias Current refers to the optical power output of a light source, such as a laser diode or an LED, when it is operating at a specific bias current.

STEP 1: Convert Input(s) to Base Unit

Incident Power: 1.75 Microwatt --> 1.75E-06 Watt (Check conversion here)
Optical Power at Bias Current: 5 Microwatt --> 5E-06 Watt (Check conversion here)

STEP 2: Evaluate Formula

Substituting Input Values in Formula

m_opt = P_o/P_bi --> 1.75E-06/5E-06

Evaluating ... ...

m_opt = 0.35

STEP 3: Convert Result to Output's Unit

0.35 --> No Conversion Required

FINAL ANSWER

0.35 <-- Modulation Index

(Calculation completed in 00.004 seconds)

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Created by Vaidehi Singh

Prabhat Engineering College (P.E.C.), Uttar Pradesh

Vaidehi Singh has created this Calculator and 25+ more calculators!

Verified by Santhosh Yadav

Dayananda Sagar College Of Engineering (DSCE), Banglore

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Go Received Rise Time = 350/Receiver Bandwidth

Optical Modulation Index Formula

Modulation Index = Incident Power/Optical Power at Bias Current
m_opt = P_o/P_bi

What is the significance of Optical Modulation Index?

The Optical Modulation Index (OMI) is a key variable in determining the performance of optical communication systems. OMI is a key variable in determining carrier power and thus CNR, which is a primary factor in the performance of optical communication systems. OMI is used to set and verify the optimum operating point (light or current bias) that provides the best tradeoff between noise (under-modulation) and distortions (over-modulation). Thus, it is the ideal point at which a laser will provide the best performance. With system operators increasing the number of services being delivered, it is crucial that OMI is set properly in order to achieve peak system performance.

How to Calculate Optical Modulation Index?

Optical Modulation Index calculator uses Modulation Index = Incident Power/Optical Power at Bias Current to calculate the Modulation Index, Optical Modulation Index (OMI) is often used. OMI is defined as the amount by which the instantaneous power of the optical carrier varies around its average power. It is expressed in units of percentage (%) and is defined in the RFoG (RF over Glass Fiber) specification for amplitude modulation. Modulation Index is denoted by m_opt symbol.

How to calculate Optical Modulation Index using this online calculator? To use this online calculator for Optical Modulation Index, enter Incident Power (P_o) & Optical Power at Bias Current (P_bi) and hit the calculate button. Here is how the Optical Modulation Index calculation can be explained with given input values -> 0.35 = 1.75E-06/5E-06.

FAQ

What is Optical Modulation Index?

Optical Modulation Index (OMI) is often used. OMI is defined as the amount by which the instantaneous power of the optical carrier varies around its average power. It is expressed in units of percentage (%) and is defined in the RFoG (RF over Glass Fiber) specification for amplitude modulation and is represented as m_opt = P_o/P_bi or Modulation Index = Incident Power/Optical Power at Bias Current. Incident Power w.r.t optics is the amount of optical power (light energy) incident on the photodetector & Optical Power at Bias Current refers to the optical power output of a light source, such as a laser diode or an LED, when it is operating at a specific bias current.

How to calculate Optical Modulation Index?

Optical Modulation Index (OMI) is often used. OMI is defined as the amount by which the instantaneous power of the optical carrier varies around its average power. It is expressed in units of percentage (%) and is defined in the RFoG (RF over Glass Fiber) specification for amplitude modulation is calculated using Modulation Index = Incident Power/Optical Power at Bias Current. To calculate Optical Modulation Index, you need Incident Power (P_o) & Optical Power at Bias Current (P_bi). With our tool, you need to enter the respective value for Incident Power & Optical Power at Bias Current 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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