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).
DIRECTIONAL COUPLER
Two parallel waveguides — coupling coefficient, transfer length, power split.
EFFECTIVE INDEX OF SILICA
Strip waveguide, EIM (TE-TE) with Sellmeier core index
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 FUSED SILICA
Sellmeier equation (Malitson 1965), λ = 0.25 – 2.5 μm
V-B CURVE (SINGLE-MODE CONDITION)
Symmetric step-index slab waveguide. Single-mode condition: V < π/2.
DIRECTIONAL COUPLER II (WDM)
Wavelength-dependent power split. κ(λ) varies via Sellmeier and slab modes — fixed geometry produces a wavelength filter.