ARRAYED WAVEGUIDE GRATING (AWG) — N×N WAVELENGTH DEMULTIPLEXER
Layers — 1: AWG array waveguides · 2: input port · 3: output ports · 10: slab star couplers. Coordinates in μm (1 dbu = 1 nm). PATH...
BANDPASS FILTER — ASYMMETRIC MZI
Set the waveguide, FSR, center wavelength and passband; the tool designs a two-directional-coupler asymmetric MZI (path difference ΔL) an...
BENDING LOSS VS RADIUS
In-plane bend, Marcuse-style radiation loss. EIM modal parameters from W (bend direction) slab.
COUPLING LOSS (SMF ↔ CHANNEL WAVEGUIDE)
Butt-coupling between SMF and a rectangular channel waveguide (modal overlap, EIM-based).
LINBO₃ CPW TW MODULATOR
Design goal: low RF loss, Z_c near 50 Ω, and velocity matching (n_RF ≈ n_opt) together maximize the EO bandwidth for a given Vπ·L pr...
DIRECTIONAL COUPLER
Two parallel waveguides — coupling coefficient, transfer length, power split.
EFFECTIVE INDEX OF SILICA
Strip waveguide, EIM (TE-TE) with Sellmeier core index
LATTICE FORM FILTER (BANDPASS)
Cascaded MZI lattice — N stages tuned for a narrow bandpass response (default: 1550 nm center, 0.2 nm passband).
MODE FIELD DIAMETER AND COUPLING LOSS
Channel-waveguide mode field diameter (D4σ) and butt-coupling loss, referenced to the SMF mode
M X N MMI COUPLER DESIGNER
Self-imaging design (general interference). Length and width from waveguide spec, ports per side, and gap.
MACH-ZEHNDER INTERFEROMETER SPECTRUM
Two identical DCs with arm path difference ΔL → wavelength filter (FSR = λ²/(n_eff·ΔL)).
MZI OPTIMIZATION (WDM TARGET)
Find DC1, DC2, ΔL parameters that match a target spectrum (e.g., 980/1550 WDM coupler).
REFRACTIVE INDEX OF SI
Sellmeier equation (Salzberg & Villa, crystalline silicon) — phase index n and group index n_g, λ = 1.4 – 6.0 μm
REFRACTIVE INDEX OF SI3N4
Sellmeier equation (Luke 2015, LPCVD stoichiometric Si₃N₄) — phase index n and group index n_g, λ = 0.4 – 2.5 μm
REFRACTIVE INDEX OF FUSED SILICA
Sellmeier equation (Malitson 1965) — phase index n and group index n_g, λ = 0.25 – 2.5 μm
SSC (spot size converter)
Spot-size converter designs coupling small silica waveguides to SMF-28. Includes the 2% 4.5×4.5 µm segmented SSC (GA + 3D BPM, 0.246 dB @1301nm) with figures, source code & GDS downloads.
TUNABLE BANDPASS FILTER — NICR HEATER
See tunable-bandpass-filter.
V-B CURVE (SINGLE-MODE CONDITION)
Symmetric step-index slab waveguide, TE/TM modes. Single-mode condition: V < π/2.
PECVD PACKING DENSITY
Film packing density of PECVD Ge-doped SiO₂ (SiH₄ / N₂O / GeH₄) — from refractive index, density, or deposition conditions.
DIRECTIONAL COUPLER II (WDM)
Wavelength-dependent power split. κ(λ) varies via Sellmeier and slab modes — fixed geometry produces a wavelength filter.