MZM Chirp
Estimate Mach–Zehnder modulator chirp from phase and power modulation.
Description
Small-signal MZM chirp compares phase modulation with an inferred field-amplitude modulation.
Small-signal MZM chirp compares phase modulation with an inferred field-amplitude modulation. Field modulation is taken as half fractional power modulation.1
Estimate Mach–Zehnder modulator chirp from phase and power modulation.
When to use MZM Chirp
Use this tool to estimate Mach–Zehnder modulator chirp from phase and power modulation.
Prepare the optical measurements, geometry, fitted coefficients or caller-selected thresholds requested. Confirm wavelength, radius/diameter, pulse-width, angle and unit conventions before running the calculation.
How to use MZM Chirp and understand its results
- Prepare the optical measurements, geometry, fitted coefficients or caller-selected thresholds requested. Confirm wavelength, radius/diameter, pulse-width, angle and unit conventions before running the calculation.
- Enter phaseModulationRadians, fractionalPowerModulation using the field table and calculation rules, then run the tool.
- Read fractionalFieldModulation, chirpParameter. The explanation below defines the units, signs, ordering and any flags or placeholder values.
- If the tool reports an input issue, correct the values and run it again. Apply the stated assumptions when interpreting a successfully returned result.
| Input field | Meaning | Value type; see rules below | Requirement |
|---|---|---|---|
| phaseModulationRadians | Measured phase modulation (rad) | number | Required |
| fractionalPowerModulation | Fractional optical-power modulation | number | Required |
Enter finite signed phase and nonzero finite fractional power modulation. Return both quantities.
fieldModulation=powerModulation/2; chirp=phase/fieldModulation Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.
| Output field | Meaning | Value type |
|---|---|---|
| fractionalFieldModulation | Fractional field-amplitude modulation | number |
| chirpParameter | MZM chirp parameter | number |
{
"input": {
"phaseModulationRadians": 0.1,
"fractionalPowerModulation": 0.2
},
"output": {
"fractionalFieldModulation": 0.1,
"chirpParameter": 1
}
}Limitations and assumptions
No bias point, large-signal transfer function or frequency-dependent calibration is fitted.
Numeric inputs must be finite. Follow the calculation-specific rules for overflow, underflow and exceptional cases. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors.
Alternative or Complementary methods
Use Pockels-Cell Drive: Calculate Pockels-cell retardation and ideal crossed-polarizer transmission. For a complementary task, use Henry Alpha: Estimate the Henry linewidth-enhancement factor from wavelength and modal-gain changes.
References
-
MZM Chirp — tool.io
Similar or alternative tools
- Pockels-Cell Drive
Calculate Pockels-cell retardation and ideal crossed-polarizer transmission.
- Henry Alpha
Estimate the Henry linewidth-enhancement factor from wavelength and modal-gain changes.