Source code for gdsfactory.components.mmi2x2_with_sbend

import numpy as np

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




@gf.cell
def mmi2x2_with_sbend(
    with_sbend: bool = True,
    s_bend: ComponentFactory = bend_s,
    cross_section: CrossSectionSpec = "xs_sc",
) -> Component:
    """Returns mmi2x2 for Cband.

    C_band 2x2MMI in 220nm thick silicon
    https://opg.optica.org/oe/fulltext.cfm?uri=oe-25-23-28957&id=376719

    Args:
        with_sbend: add sbend.
        s_bend: S-bend function.
        cross_section: spec.
    """

    def mmi_widths(t):
        return np.array([2 * 0.7 + 0.2, 1.48, 1.48, 1.48, 1.6])

    c = gf.Component()

    P = gf.path.straight(length=2 * 2.4 + 2 * 1.6, npoints=5)
    xs = gf.get_cross_section(cross_section)
    xs0 = xs.copy(width_function=mmi_widths)
    ref = c << gf.path.extrude(P, cross_section=xs0)

    # Add input and output tapers
    taper = gf.components.taper(
        length=1,
        width1=0.5,
        width2=0.7,
        cross_section=cross_section,
    )
    topl_taper = c << taper
    topl_taper.move((-1, 0.45))
    botl_taper = c << taper
    botl_taper.move((-1, -0.45))

    topr_taper = c << taper
    topr_taper.mirror()
    topr_taper.move((9, 0.45))

    botr_taper = c << taper
    botr_taper.mirror()
    botr_taper.move((9, -0.45))

    if with_sbend:
        sbend = s_bend(cross_section=cross_section)

        topl_sbend = c << sbend
        topl_sbend.mirror([0, 1])
        botl_sbend = c << sbend
        topr_sbend = c << sbend
        botr_sbend = c << sbend
        botr_sbend.mirror([0, 1])

        topl_sbend.connect("o1", destination=topl_taper.ports["o1"])
        botl_sbend.connect("o1", destination=botl_taper.ports["o1"])
        topr_sbend.connect("o1", destination=topr_taper.ports["o1"])
        botr_sbend.connect("o1", destination=botr_taper.ports["o1"])

        c.add_port("o1", port=botl_sbend.ports["o2"])
        c.add_port("o2", port=topl_sbend.ports["o2"])
        c.add_port("o3", port=topr_sbend.ports["o2"])
        c.add_port("o4", port=botr_sbend.ports["o2"])

        c.absorb(topr_sbend)
        c.absorb(topl_sbend)
        c.absorb(botr_sbend)
        c.absorb(botl_sbend)
    else:
        c.add_port("o2", port=topl_taper.ports["o1"])
        c.add_port("o1", port=botl_taper.ports["o1"])
        c.add_port("o3", port=topr_taper.ports["o1"])
        c.add_port("o4", port=botr_taper.ports["o1"])

    c.absorb(ref)
    c.absorb(topr_taper)
    c.absorb(topl_taper)
    c.absorb(botr_taper)
    c.absorb(botl_taper)
    return c



if __name__ == "__main__":
    # c = mmi2x2_with_sbend(
    #     with_sbend=True,
    #     cross_section=dict(cross_section="xs_sc", settings=dict(layer=(2, 0))),
    # )
    c = mmi2x2_with_sbend()
    c.show(show_ports=True)