Semiconductor Distributed Feedback Laser Grating Period Calculator
Calculate explicit mλ/(2neff) DFB Bragg period with caller order/index, not assumed effective wavelength or fabrication specification.
Description
The Bragg condition relates vacuum wavelength, effective index, grating order, and a modeled DFB period.
The Bragg condition relates vacuum wavelength, effective index, grating order, and a modeled DFB period.1
All three optical conventions must match the independently selected laser branch.
When to use Semiconductor Distributed Feedback Laser Grating Period Calculator
Use this tool when you need to calculate the stated measurement summary or conditional model from matched observations. Prepare independently matched device or specimen measurements, units, branch selection, and model or calibration conventions.
How to use Semiconductor Distributed Feedback Laser Grating Period Calculator and understand its results
- Prepare independently matched device or specimen measurements, units, branch selection, and model or calibration conventions.
- Enter callerBraggVacuumWavelengthM, callerMatchedEffectiveIndex, callerGratingOrder, following the field table and calculation rules below, then run the tool.
- Read modeledDfbFirstBraggPeriodM. Use the output table and calculation rules below to interpret units, signs, crossings, and flags.
- Correct any input issues and run again. Before using a successful result, review its units, signs, evidence coverage, and stated model or reference assumptions.
| Input field | Meaning | Value type | Requirement |
|---|---|---|---|
| callerBraggVacuumWavelengthM | Caller bragg vacuum wavelength m | number | Required |
| callerMatchedEffectiveIndex | Caller matched effective index | number | Required |
| callerGratingOrder | Caller grating order | number | Required |
Require positive vacuum wavelength and effective index and a safe-integer grating order from 1 to 100. Return order times wavelength divided by twice effective index, in metres. Despite the output name containing First, the caller order is used.
Λ=m×λvacuum/(2neffective) Read these symbols with the field meanings and branch or reference rules above.
| Output field | Meaning | Value type |
|---|---|---|
| modeledDfbFirstBraggPeriodM | Modeled DFB first bragg period m | number |
{
"input": {
"callerBraggVacuumWavelengthM": 1,
"callerMatchedEffectiveIndex": 2,
"callerGratingOrder": 1
},
"output": {
"modeledDfbFirstBraggPeriodM": 0.25
}
}Limitations and assumptions
Measurements, branch identification, units, and model applicability must be independently established. Results do not supply universal material constants, a complete physical model, or operating-condition approval.
Missing required fields, unknown fields, wrong types, and violated calculation rules return input issues. Numeric values must be finite; nonfinite numeric outputs are rejected.
Alternative or Complementary methods
For a related task, use Semiconductor Distributed Bragg Reflector Reflectivity Calculator: An ideal quarter-wave reflector depends on index contrast, pair count, and the incident and substrate media. Its center-wavelength normal-incidence intensity reflectivity is a conditional stack model. For a complementary step, use Semiconductor Edge Emitting Laser Slope Efficiency Vs Temperature Calculator: Laser slope efficiency can vary with temperature on an independently matched operating branch. A measured calibration supplies response values and local slopes without an assumed photon-energy efficiency model.
References
Similar or alternative tools
- Semiconductor Distributed Bragg Reflector Reflectivity Calculator
An ideal quarter-wave reflector depends on index contrast, pair count, and the incident and substrate media. Its center-wavelength normal-incidence intensity reflectivity is a conditional stack model.
- Semiconductor Edge Emitting Laser Slope Efficiency Vs Temperature Calculator
Laser slope efficiency can vary with temperature on an independently matched operating branch. A measured calibration supplies response values and local slopes without an assumed photon-energy efficiency model.