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72 lines
2.5 KiB
Python
72 lines
2.5 KiB
Python
"""Loop mirror composite layouts."""
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from typing import Any
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import nazca as nd
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import numpy as np
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import nazca.interconnects as IC
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from ..geometry import *
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from ..routing import *
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from ..primitives.pic import *
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from ..electronics import Vias
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from ..primitives.passive import waveguide
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class LoopMirror():
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"""Loop mirror reflector built from a beam splitter and return bend.
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Parameters
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----------
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xs_wg : str, optional
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Waveguide cross-section name.
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w_wg : float, optional
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Optical waveguide width in microns.
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Radius : float, optional
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Bend radius used for the loop mirror routing.
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angle : float, optional
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Bend angle in degrees for the side bends.
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sharp_patch : bool, optional
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Add cladding patch geometry around sharp loop features.
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BS : Any, optional
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Beam splitter object or cell. If not provided, a default directional
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coupler is generated.
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Attributes
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----------
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cell : nazca.Cell
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Generated loop mirror layout cell.
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"""
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def __init__(self,
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xs_wg: str='strip',
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w_wg: float=0.45,
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Radius: float = 20,
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angle: float = 45,
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sharp_patch: bool=True,
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BS: Any=None) -> None:
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with nd.Cell(instantiate=False) as C:
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if (BS==None):
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BS = DC(w_cp=0.45,gap=0.2,w_wg=w_wg,L_cp=10,R0=10,angle=20,xs=xs_wg,sharp_patch=True)
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BS_Inst = BS.cell.put(0,0,0) ## middle
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D_port = np.abs(BS_Inst.pin['b1'].y - BS_Inst.pin['b2'].y)
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pic = Route(radius=Radius,width=w_wg,xs=xs_wg)
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BU = nd.bend(radius=Radius,width=w_wg,xs=xs_wg,angle=angle).put('a0',BS_Inst.pin['b1'],flip=0)
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BD = nd.bend(radius=Radius,width=w_wg,xs=xs_wg,angle=angle).put('a0',BS_Inst.pin['b2'],flip=1)
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R_loop = (Radius+D_port/2)/np.cos(angle/180*np.pi) - Radius
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BC = nd.bend(radius=R_loop,width=w_wg,xs=xs_wg,angle=180+angle*2).put('a0',BU.pin['b0'],flip=1)
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if (sharp_patch==True):
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for layers,growx,growy,acc in nd.layeriter(xs=xs_wg):
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(a1,b1), (a2,b2),c1,c2 = growx
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if (layers.find('CLD')!=-1):
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### middle patch
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nd.strt(length=(R_loop+w_wg*a1+b1)*(1+np.sin((180-angle)/180*np.pi))+(Radius)*np.sin(angle/180*np.pi),width=2*(R_loop+w_wg*a1+b1),layer=layers).put(BS_Inst.pin['b1'].x,0,0)
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nd.Pin(name='a1',pin=BS_Inst.pin['a1']).put()
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self.cell = C
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