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52 lines
2.0 KiB
Python
52 lines
2.0 KiB
Python
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import numpy as np
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from ..primitives.passive import DC_bend
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class DC_bend_50_50_Cband(DC_bend):
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def __init__(self, w_wg: float, show_pins: bool=False) -> None:
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'''
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This is a wideband 50/50 Direction Coupler based on bend directional coupler, from 1500nm to 1600nm.
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'''
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w_in = 0.45
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w_out = 0.45
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gap = 0.2
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r_in = 60
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coupling_length = 19.08
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theta_arc = coupling_length / (r_in+gap/2+w_in/2) * 180 / np.pi
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super().__init__(w_in=w_in, w_out=w_out, gap=gap, r_in=r_in, theta_arc=theta_arc, w_wg=w_wg, theta_ext=10, xs_wg="strip", show_pins=show_pins)
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self.cell = self.generate_gds(cellname="_50_50_Cband")
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class DC_bend_20_80_Cband(DC_bend):
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'''
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This is a wideband 20/80 Direction Coupler based on bend directional coupler, from 1500nm to 1600nm.
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Through: 80%
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Cross: 20%
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'''
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def __init__(self, w_wg: float, show_pins: bool=False) -> None:
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w_in = 0.45
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w_out = 0.45
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gap = 0.2
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r_in = 41
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coupling_length = 19.6
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theta_arc = coupling_length / (r_in+gap/2+w_in/2) * 180 / np.pi
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super().__init__(w_in=w_in, w_out=w_out, gap=gap, r_in=r_in, theta_arc=theta_arc, w_wg=w_wg, theta_ext=10, xs_wg="strip", show_pins=show_pins)
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self.generate_gds(cellname="_20_80_Cband")
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class DC_bend_4_96_Cband(DC_bend):
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'''
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This is a wideband 20/80 Direction Coupler based on bend directional coupler, from 1500nm to 1600nm.
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Through: 96%
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Cross: 4%
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'''
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def __init__(self, w_wg: float, show_pins: bool=False) -> None:
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w_in = 0.45
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w_out = 0.45
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gap = 0.2
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r_in = 30
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coupling_length = 18.9
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theta_arc = coupling_length / (r_in+gap/2+w_in/2) * 180 / np.pi
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super().__init__(w_in=w_in, w_out=w_out, gap=gap, r_in=r_in, theta_arc=theta_arc, w_wg=w_wg, theta_ext=10, xs_wg="strip", show_pins=show_pins)
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self.generate_gds(cellname="_4_96_Cband") |