Taylor658/frequency-dispersion

📡 Frequency Dispersion Dataset

🌈 100,000 synthetic rows describing frequency dispersion in photonic waveguides: group index, chromatic dispersion, mode group delay, and effective index across a wavelength range, with material, loss, and operating parameters.

⚠️ Disclaimer: All rows are synthetically generated. Values are sampled within ranges typical of integrated photonic platforms; no row is a measured device or a mode-solver run. The measurement_method and measurement_uncertainty columns are schema fields, not records of a measurement.

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📋 At a Glance

🔢 Rows	100,000
📊 Columns	21
🌈 Wavelength Coverage	wavelength_min to wavelength_max (e.g., 1260 to 1625 nm, O through L band)
🧪 Materials	Silicon Nitride core on Silicon Dioxide cladding, among others
🎯 Primary Targets	chromatic_dispersion, mode_group_delay_min/max, effective_index_change
🧬 Generation	Synthetic, parameterized over wavelength, material, and geometry ranges
🌍 Language	English
📄 License	MIT
🏷️ Version	1.1.0

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✨ Key Highlights

• 🌈 Focus: Frequency-dependent behavior of waveguides for optical chips
• 📊 21 Structured Columns: wavelength range, dispersion metrics, effective index, material, loss, and operating parameters
• 📦 100,000 Rows: sufficient for training and validation splits
• 🎯 Use Cases:
  • 📉 Regression of chromatic dispersion and group delay against wavelength range, material, and length
  • 📡 Broadband device design studies targeting low dispersion across a band
  • 🧪 Pipeline prototyping on a dispersion-analysis schema before connecting to mode-solver output

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🏗️ Dataset Structure

Each row corresponds to a single waveguide configuration evaluated across a wavelength range.

🌈 Wavelength Range

Column	Unit	Description
wavelength_min	nm	Lower bound of operating wavelength
wavelength_max	nm	Upper bound of operating wavelength

📉 Dispersion Metrics

Column	Unit	Description
group_index_min	dimensionless	Group index at wavelength_min
group_index_max	dimensionless	Group index at wavelength_max
chromatic_dispersion	ps/(nm·km)	Total dispersion over the wavelength range
mode_group_delay_min	ps/m	Group delay per unit length at wavelength_min
mode_group_delay_max	ps/m	Group delay per unit length at wavelength_max
material_dispersion	ps/(nm·km)	Material contribution to total dispersion
waveguide_dispersion	ps/(nm·km)	Geometric (waveguide) contribution to total dispersion

🔦 Effective Index

Column	Unit	Description
effective_index_at_min	dimensionless	Mode effective index at wavelength_min
effective_index_at_max	dimensionless	Mode effective index at wavelength_max
effective_index_change	dimensionless	Difference between the two endpoint values

🧪 Material Properties

Column	Unit	Description
waveguide_material	categorical	Core material (e.g., Silicon Nitride)
cladding_material	categorical	Cladding material (e.g., Silicon Dioxide)

⚙️ Loss and Operating Parameters

Column	Unit	Description
propagation_loss_min	dB/cm	Loss at wavelength_min
propagation_loss_max	dB/cm	Loss at wavelength_max
temperature	°C	Operating temperature
signal_bandwidth	GHz	Signal bandwidth
device_length	mm	Waveguide length

🏷️ Metadata

Column	Unit	Description
measurement_method	categorical	Schema label for a nominal method (e.g., Optical Time Domain Reflectometry); no measurement was performed
measurement_uncertainty	%	Nominal uncertainty label

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🔍 Example Row

wavelength_min                = 1260.0
wavelength_max                = 1625.0
group_index_min               = 1.50500
group_index_max               = 1.52500
chromatic_dispersion          = 10.25
mode_group_delay_min          = 0.12
mode_group_delay_max          = 0.18
effective_index_at_min        = 1.45200
effective_index_at_max        = 1.45900
effective_index_change        = 0.00700
waveguide_material            = Silicon Nitride (Si₃N₄)
cladding_material             = Silicon Dioxide (SiO₂)
propagation_loss_min          = 0.2
propagation_loss_max          = 0.4
measurement_method            = Optical Time Domain Reflectometry
measurement_uncertainty       = 1.5
temperature                   = 25.0
signal_bandwidth              = 50.0
device_length                 = 10.0
material_dispersion           = 3.20
waveguide_dispersion          = 7.05

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💡 Usage

🚀 Load the Dataset

from datasets import load_dataset

dataset = load_dataset("Taylor658/frequency-dispersion", split="train")
print(dataset[0])

🎯 Regression Example

Treat wavelength range, material, and operating columns as features and a dispersion metric as the target:

df = dataset.to_pandas()

features = df[[
    "wavelength_min", "wavelength_max", "temperature",
    "signal_bandwidth", "device_length"
]]
target = df["chromatic_dispersion"]

# Encode categorical columns, then fit a regression model (scikit-learn, XGBoost, etc.)

🔗 Companion Resources

• 📊 SiN-photonic-waveguide-loss-efficiency: loss and efficiency dataset on the same platform
• 🔥 thermal-stability: thermo-optic behavior of the same waveguide family
• 🛠️ Photonic-Waveguide: agentic SiN waveguide design workflow

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⚠️ Limitations

🧬 Synthetic Content

• Values are sampled within ranges typical of integrated photonic platforms and may not represent any specific foundry process
• No row is a measured device or the output of a mode solver

📏 Physics Simplifications

• Endpoint values (_min, _max) describe the wavelength limits only; the shape of the dispersion curve between them is not recorded
• Columns are sampled within ranges rather than solved jointly, so relationships that hold physically (for example, group index exceeding effective index, or effective index tracking core confinement) may not hold row by row
• Assumes ideal waveguides with no fabrication-induced imperfections

📐 Measurement Realism

• measurement_uncertainty is a nominal label and does not reproduce real measurement artifacts
• measurement_method is a label; no measurement was performed

🚫 Not for Device Qualification

• Predictions trained on this data must be validated against mode-solver results or measured devices before informing a design

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📄 License

Released under the MIT License. You may modify, distribute, and use it for commercial or non-commercial purposes with attribution.

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🙌 Citation

@misc{frequency_dispersion_dataset_2026,
  title  = {Frequency Dispersion Dataset (Synthetic)},
  author = {Taylor, A.},
  year   = {2026},
  howpublished = {\url{https://huggingface.co/datasets/Taylor658/frequency-dispersion}}
}

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🧑‍💻 Contributing

• 💬 Open a Discussion to propose additional materials, wavelength bands, or dispersion metrics

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👨‍🚀 Author: A Taylor · 🤗 Hugging Face: hf.co/Taylor658 · 🐙 GitHub: ATaylorAerospace