Source code for gdsfactory.components.mmi1x2

from __future__ import annotations

import gdsfactory as gf
from gdsfactory.component import Component
from gdsfactory.components.taper import taper as taper_function
from gdsfactory.typings import ComponentFactory, CrossSectionSpec


[docs] @gf.cell def mmi1x2( width: float | None = None, width_taper: float = 1.0, length_taper: float = 10.0, length_mmi: float = 5.5, width_mmi: float = 2.5, gap_mmi: float = 0.25, taper: ComponentFactory = taper_function, cross_section: CrossSectionSpec = "xs_sc", **kwargs, ) -> Component: r"""1x2 MultiMode Interferometer (MMI). Args: width: input and output straight width. Defaults to cross_section width. width_taper: interface between input straights and mmi region. length_taper: into the mmi region. length_mmi: in x direction. width_mmi: in y direction. gap_mmi: gap between tapered wg. taper: taper function. cross_section: specification (CrossSection, string or dict). .. code:: length_mmi <------> ________ | | | \__ | __ o2 __/ /_ _ _ _ o1 __ | _ _ _ _| gap_mmi \ \__ | __ o3 | / |________| <-> length_taper """ c = Component() gap_mmi = gf.snap.snap_to_grid(gap_mmi, grid_factor=2) x = gf.get_cross_section(cross_section, **kwargs) width = width or x.width _taper = taper( length=length_taper, width1=width, width2=width_taper, cross_section=x, ) delta_width = width_mmi - width y = width_mmi / 2 c.add_polygon([(0, -y), (length_mmi, -y), (length_mmi, y), (0, y)], layer=x.layer) for section in x.sections[1:]: layer = section.layer y = section.width / 2 + delta_width / 2 c.add_polygon( [ (-delta_width, -y), (length_mmi + delta_width, -y), (length_mmi + delta_width, y), (-delta_width, y), ], layer=layer, ) x.add_bbox(c) a = gap_mmi / 2 + width_taper / 2 ports = [ gf.Port( "o1", orientation=180, center=(0, 0), width=width_taper, layer=x.layer, cross_section=x, ), gf.Port( "o2", orientation=0, center=(+length_mmi, +a), width=width_taper, layer=x.layer, cross_section=x, ), gf.Port( "o3", orientation=0, center=(+length_mmi, -a), width=width_taper, layer=x.layer, cross_section=x, ), ] for port in ports: taper_ref = c << _taper taper_ref.connect(port="o2", destination=port) c.add_port(name=port.name, port=taper_ref.ports["o1"]) c.absorb(taper_ref) return c
if __name__ == "__main__": import gdsfactory as gf c = gf.components.mmi1x2(cross_section="xs_rc_bbox") # c = gf.components.mmi1x2(cross_section="xs_rc") # print(c.xmin) # c.xmin = 0 # print(c.xmin) c.show(show_ports=True)