gdsfactory.routing.get_bundle_path_length_match

gdsfactory.routing.get_bundle_path_length_match(ports1: list[Port], ports2: list[Port], separation: float = 30.0, end_straight_length: float | None = None, extra_length: float = 0.0, nb_loops: int = 1, modify_segment_i: int = -2, bend: ComponentSpec = <function bend_euler>, straight: ComponentSpec = <function straight>, taper: ComponentSpec | None = <function taper>, start_straight_length: float = 0.0, route_filter: Callable = <function get_route_from_waypoints>, sort_ports: bool = True, cross_section: CrossSectionSpec | MultiCrossSectionAngleSpec = functools.partial(<function cross_section>, radius=10, radius_min=5), enforce_port_ordering: bool = True, **kwargs) → list[Route]

Returns list of routes that are path length matched.

Parameters:

• ports1 – list of ports.

• ports2 – list of ports.

• separation – between the loops.

• end_straight_length – if None tries to determine it.

• extra_length – distance added to all path length compensation. Useful is we want to add space for extra taper on all branches.

• nb_loops – number of extra loops added in the path.

• modify_segment_i – index of the segment that accommodates the new turns default is next to last segment.

• bend – for bends.

• straight – for straights.

• taper – spec.

• start_straight_length – in um.

• route_filter – get_route_from_waypoints.

• sort_ports – sorts ports before routing.

• cross_section – factory.

• kwargs – cross_section settings.

Tips:

• If path length matches the wrong segments, change modify_segment_i arguments.

• Adjust nb_loops to avoid too short or too long segments

• Adjust separation and end_straight_offset to avoid compensation collisions

import gdsfactory as gf

c = gf.Component("path_length_match_sample")

dy = 2000.0
xs1 = [-500, -300, -100, -90, -80, -55, -35, 200, 210, 240, 500, 650]
pitch = 100.0
N = len(xs1)
xs2 = [-20 + i * pitch for i in range(N)]

a1 = 90
a2 = a1 + 180
ports1 = [gf.Port(name=f"top_{i}", center=(xs1[i], +0), width=0.5, orientation=a1, layer="WG") for i in range(N)]
ports2 = [gf.Port(name=f"bot_{i}", center=(xs2[i], dy), width=0.5, orientation=a2, layer="WG") for i in range(N)]

routes = gf.routing.get_bundle_path_length_match(ports1, ports2, extra_length=44)
for route in routes:
    c.add(route.references)

gf.config.set_plot_options(show_subports=False)
c.plot()

(Source code, png, hires.png, pdf)