Examples
Straight Waveguide
Build and export a straight waveguide with a slab and slab converters.
This example creates a WGStraight device with a 200 µm core, a wider slab, and converters at both ends. Placer inserts the device into the top-level cell while keeping the placement code independent from KLayout's low-level instance API.
Code
Run this snippet from the repository root after installing the workspace packages:
from pathlib import Path
import laylight
from laylight.render import export_layout_png, new_layout
from laylight.structure.wg import WGStraight
layout, top, tech = new_layout("STRAIGHT_WAVEGUIDE_EXAMPLE")
device = WGStraight(
length=200,
width=0.5,
slab_enable=True,
slab_width=8,
slab_left_converter=True,
slab_right_converter=True,
layout=layout,
tech=tech,
)
laylight.Placer(device).into(top)
output_dir = Path("build/examples")
output_dir.mkdir(parents=True, exist_ok=True)
layout.write(str(output_dir / "straight_waveguide.gds"))
export_layout_png(
layout,
output_dir / "straight_waveguide.png",
cell=top,
max_pixels=960,
)The code writes both straight_waveguide.gds and straight_waveguide.png to build/examples.
Rendered layout
The wide hatched region is the slab. The narrower core is centered inside it, and the short end regions are the slab converters.