Examples
Spiral Delay
Build and export a compact spiral optical delay line.
SpiralDelay routes a long waveguide path through a compact footprint. It is useful for delay lines and path-length experiments where the input and output ports should remain accessible at the outside of the spiral.
Code
from pathlib import Path
import laylight
from laylight.render import export_layout_png, new_layout
from laylight.structure.spiral import SpiralDelay
layout, top, tech = new_layout("SPIRAL_DELAY_EXAMPLE")
device = SpiralDelay(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 / "spiral_delay.gds"))
export_layout_png(
layout,
output_dir / "spiral_delay.png",
cell=top,
max_pixels=960,
)The code writes spiral_delay.gds and spiral_delay.png to build/examples.
Rendered layout
The turns, straight_length, and pitch parameters control the path length and footprint. pitch must remain larger than the waveguide width.