Tool · PIC design

Bragg Wavelength Calculator

Convert between Bragg grating period and wavelength using λ_B = 2 n_eff Λ / m.

Platform preset

Effective index n_eff

From mode solver (Lumerical MODE, Ansys, Tidy3D, etc.) at design wavelength.

Grating order m

Target Bragg wavelength λ_B (nm)

Required period

322.917 nm

Λ = (1 × 1550) / (2 × 2.4)

Notes: The effective index is wavelength-dependent and varies with waveguide geometry, cladding, and temperature. The presets are typical values — always confirm with a mode solver for your specific design. The shown formula assumes a uniform Bragg grating; chirped or apodized gratings require fuller modeling.