waveguide_factory_py

该脚本主要为实现自动布线中端口获取以及弯曲布线提供更智能的方案。主要包括：

• 直波导

• 弯曲波导

• 欧拉弯曲

• 案例

直波导

类定义:

@dataclass(frozen=True)
class StraightFactory(fpt.IStraightWaveguideFactory):
    def __call__(self, type: fpt.IWaveguideType, length: float):
        from gpdk.components.straight.straight import Straight

        straight = Straight(length=length, waveguide_type=type)
        return straight, ("op_0", "op_1")

返回直波导与端口信息，为自动布线时端口连接提供支持。

弯曲波导

类定义:

@dataclass(frozen=True)
class CircularBendFactory(fpt.IBendWaveguideFactory):
    radius_eff: float
    waveguide_type: fpt.IWaveguideType = field(repr=False, compare=False)

    def __call__(self, central_angle: float):
        from gpdk.components.bend.bend_circular import BendCircular, BendCircular90_FWG_C_WIRE, BendCircular90_FWG_C_EXPANDED
        from gpdk.technology import get_technology

        TECH = get_technology()

        radius_eff = self.radius_eff

        bend = None
        if fp.is_close(abs(central_angle), math.pi / 2):
            if self.waveguide_type == TECH.WG.FWG.C.WIRE:
                bend = BendCircular90_FWG_C_WIRE()
            elif self.waveguide_type == TECH.WG.FWG.C.EXPANDED:
                bend = BendCircular90_FWG_C_EXPANDED()

            if bend and central_angle < 0:
                bend = bend.v_mirrored()

        if bend is None:
            bend = BendCircular(degrees=math.degrees(central_angle), radius=radius_eff, waveguide_type=self.waveguide_type)

        return bend, radius_eff, ("op_0", "op_1")

可以选择设定的参数为

• radius_eff 半径

• waveguide_type 波导类型

返回弯曲波导以及半径与端口信息。

欧拉弯曲

类定义:

@dataclass(frozen=True)
class EulerBendFactory(fpt.IBendWaveguideFactory):
    radius_min: float
    l_max: float
    waveguide_type: fpt.IWaveguideType = field(repr=False, compare=False)

    def __call__(self, central_angle: float):
        from gpdk.components.bend.bend_euler import BendEuler, BendEuler90, BendEuler90_FWG_C_WIRE, BendEuler90_FWG_C_EXPANDED
        from gpdk.technology.interfaces import CoreCladdingWaveguideType
        from gpdk.technology import get_technology

        TECH = get_technology()

        bend = None
        if fp.is_close(abs(central_angle), math.pi / 2):
            if self.waveguide_type == TECH.WG.FWG.C.WIRE:
                bend = BendEuler90_FWG_C_WIRE()
            elif self.waveguide_type == TECH.WG.FWG.C.EXPANDED:
                bend = BendEuler90_FWG_C_EXPANDED()
            elif isinstance(self.waveguide_type, CoreCladdingWaveguideType):
                bend = BendEuler90(slab_square=True, radius_min=self.radius_min, l_max=self.l_max, waveguide_type=self.waveguide_type)

            if bend and central_angle < 0:
                bend = bend.v_mirrored()

        if bend is None:
            bend = BendEuler(degrees=math.degrees(central_angle), radius_min=self.radius_min, l_max=self.l_max, waveguide_type=self.waveguide_type)

        return bend, bend.raw_curve.radius_eff, ("op_0", "op_1")

可以选择设定的参数为:

• radius_min 最小半径

• l_max 欧拉螺旋在半弯曲中的最大长度

• waveguide_type 波导类型

返回欧拉弯曲，以及欧拉弯的等效半径以及相应的端口信息。

案例

原始模型:

from pathlib import Path

gds_file = Path(__file__).parent / "local" / Path(__file__).with_suffix(".gds").name
library = fp.Library()

TECH = get_technology()
# =============================================================
# fmt: off
from gpdk.components.directional_coupler.directional_coupler_sbend import DirectionalCouplerSBend
from gpdk.components.mmi.mmi import Mmi
from gpdk.technology.waveguide_factory import EulerBendFactory

library += [
        HFanout(name="mmi",device=Mmi(waveguide_type=TECH.WG.FWG.C.WIRE), left_spacing=100, right_spacing=100, left_distance=100,
                right_distance=100,
                left_waveguide_type=TECH.WG.SWG.C.WIRE,
                right_waveguide_type=TECH.WG.SWG.C.WIRE)
    ]
# fmt: on
# =============================================================
fp.export_gds(library, file=gds_file)
fp.plot(library)

通过欧拉弯曲’EulerBendFactory()’引导走线的模型:

from pathlib import Path

gds_file = Path(__file__).parent / "local" / Path(__file__).with_suffix(".gds").name
library = fp.Library()

TECH = get_technology()
# =============================================================
# fmt: off
from gpdk.components.directional_coupler.directional_coupler_sbend import DirectionalCouplerSBend
from gpdk.components.mmi.mmi import Mmi
from gpdk.technology.waveguide_factory import EulerBendFactory

def bend_factories(waveguide_type: fp.IWaveguideType):
    if waveguide_type == TECH.WG.FWG.C.WIRE:
        return EulerBendFactory(radius_min=15, l_max=15, waveguide_type=waveguide_type)
    return waveguide_type.bend_factory


library += [
        HFanout(name="mmi",device=Mmi(waveguide_type=TECH.WG.FWG.C.WIRE), left_spacing=100, right_spacing=100, left_distance=100,
                right_distance=100,
                bend_factories=bend_factories,
                left_waveguide_type=TECH.WG.SWG.C.WIRE,
                right_waveguide_type=TECH.WG.SWG.C.WIRE)
    ]
# fmt: on
# =============================================================
fp.export_gds(library, file=gds_file)
fp.plot(library)

最终走线结果对比：