FiberCouplerCurvedGrating¶
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class
picazzo3.fibcoup.curved.cell.
FiberCouplerCurvedGrating
(*args, **kwargs)¶ Class for the definition of periodic curved fiber grating couplers with a focal point that fit in a box.
Parameters: inclination: float
out-of-plane angle of the grating coupler
socket: PCell and WgSocket
socket of the fiber coupler
grating: PCell
grating of this fiber coupler
start_trace_template: PCell and _WaveguideTemplate
start waveguide for the socket waveguide (narrow side)
wide_trace_template: PCell and _WaveguideTemplate
end waveguide for the socket waveguide (broad side)
name:
The unique name of the pcell
Views
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Layout
¶ Parameters: fill_factor: float and fraction
Fill factor used to calculate the trench widths. 0 means no trench a all and 1 means that the trench covers the entire period
grating_transformation: GenericNoDistortTransform
n_o_lines: int and number > 0
Number of lines in the grating. By default this number is chosen so that the curves fit in the box width.
period_x: float and number > 0
Period in the x direction.
process: ProcessLayer
default process used for the grating
socket_extension: float and Real, number and number >= 0
extension of the wide side of the socket, asymmetric with respect to the specified center. By default this is calculated such that the entire grating fits in the socket with a margin of TECH.IO.FIBCOUP.CURVED.DEFAULT_SOCKET_MARGIN_FROM_GRATING
socket_straight_extension: Coord2
tuple: straight extension at start and end of socket
spread_angle: float
Angle in degrees of the far field radiation field of the socket. By default this is set to be equal to the angle of the taper that is set by its length and the width of the core of input and output waveguides.
view_name: str and ( Alphanumeric string or Contains _$ )
The name of the view
min_x: float and number > 0
Miniumum distance from the first line to the focus. By default it is set to the focal distance.
focal_distance_x: float
Distance between the vertical port of the grating and the focal point. By default this is TECH.IO.FIBCOUP.CURVED.GRATING.FOCAL_DISTANCE.
period_y: float and number > 0
Period in the y direction. By default equal to
period_x
start_radius_y: float and number > 0
Starting radius in the y direction. By default this is set to
start_period_x
box_width: float and number > 0
Width of the box used that contains the grating.
purpose:
socket_transformation: GenericNoDistortTransform
Other Parameters: socket_length: locked
line_widths: locked
Line width of the grating coupler
start_radius_x: locked
centers: locked
focal_point: Coord2, locked
Coordinate of the east focus point shared by all ellipses. The y coordinate of the focuspoint has to be zero
ellipse_radii_x: locked
ellipse_radii_y: locked
end_angles: locked
start_angles: locked
Examples
Basic use:
# Example demonstrating the basic use of the FiberGratingCoupler. from technologies import silicon_photonics from ipkiss3 import all as i3 from picazzo3.fibcoup.curved import FiberCouplerCurvedGrating from picazzo3.traces.wire_wg import WireWaveguideTemplate # Creating the wire templates for the socket. start_wg_tmpl = WireWaveguideTemplate() start_wg_tmpl.Layout(core_width=0.5, cladding_width=2 * i3.TECH.WG.TRENCH_WIDTH + 0.5) end_wg_tmpl = WireWaveguideTemplate() end_wg_tmpl.Layout(core_width=17.0, cladding_width=2 * i3.TECH.WG.TRENCH_WIDTH + 17.0) fc_cell = FiberCouplerCurvedGrating(start_trace_template=start_wg_tmpl, wide_trace_template=end_wg_tmpl) fc_layout = fc_cell.Layout(period_x=0.8, # We with a period of 0.8 focal_distance_x=20.0) # We use a focal distance of 20.0 fc_layout.visualize(annotate=True)
Changing the
n_o_lines
and where to place the first line:# Example demonstrating how to change the length of the grating coupler using n_o_lines # and how to set the location of the first grating line using min_x from technologies import silicon_photonics from ipkiss3 import all as i3 from picazzo3.fibcoup.curved import FiberCouplerCurvedGrating from picazzo3.traces.wire_wg import WireWaveguideTemplate # Creating the wire templates for the socket. start_wg_tmpl = WireWaveguideTemplate() start_wg_tmpl.Layout(core_width=0.5, cladding_width=2 * i3.TECH.WG.TRENCH_WIDTH + 0.5) end_wg_tmpl = WireWaveguideTemplate() end_wg_tmpl.Layout(core_width=17.0, cladding_width=2 * i3.TECH.WG.TRENCH_WIDTH + 17.0) fc_cell = FiberCouplerCurvedGrating(start_trace_template=start_wg_tmpl, wide_trace_template=end_wg_tmpl) fc_layout = fc_cell.Layout(period_x=0.8, # We with a period of 0.8 focal_distance_x=20.0,# We use a focal distance of 20.0 n_o_lines=30,# We set the number of lines to 30 min_x=10.0) #We set the first line at 10. fc_layout.visualize(annotate=True)
Changing the
box_width
:# Example demonstrating how to change the box_width. from technologies import silicon_photonics from ipkiss3 import all as i3 from picazzo3.fibcoup.curved import FiberCouplerCurvedGrating from picazzo3.traces.wire_wg import WireWaveguideTemplate # Creating the wire templates for the socket. start_wg_tmpl = WireWaveguideTemplate() start_wg_tmpl.Layout(core_width=0.5, cladding_width=2 * i3.TECH.WG.TRENCH_WIDTH + 0.5) end_wg_tmpl = WireWaveguideTemplate() end_wg_tmpl.Layout(core_width=17.0, cladding_width=2 * i3.TECH.WG.TRENCH_WIDTH + 17.0) fc_cell = FiberCouplerCurvedGrating(start_trace_template=start_wg_tmpl, wide_trace_template=end_wg_tmpl) fc_layout = fc_cell.Layout(period_x=0.8, # We with a period of 0.8 focal_distance_x=20.0,# We use a focal distance of 20.0. n_o_lines=30,#We set the number of lines to 30. min_x=10.0,#We set the first line at 10. box_width=40.0)# All the lines will be contained between -20 and 20 fc_layout.visualize(annotate=True)
Changing the
fill_factor
to set the line width:# Example demonstrating how to change the fill_factor. import technologies.silicon_photonics from ipkiss3 import all as i3 from picazzo3.fibcoup.curved import FiberCouplerCurvedGrating from picazzo3.traces.wire_wg import WireWaveguideTemplate # Creating the wire templates for the socket. start_wg_tmpl = WireWaveguideTemplate() start_wg_tmpl.Layout(core_width=0.5, cladding_width=2 * i3.TECH.WG.TRENCH_WIDTH + 0.5) end_wg_tmpl = WireWaveguideTemplate() end_wg_tmpl.Layout(core_width=17.0, cladding_width=2 * i3.TECH.WG.TRENCH_WIDTH + 17.0) fc_cell = FiberCouplerCurvedGrating(start_trace_template=start_wg_tmpl, wide_trace_template=end_wg_tmpl) fc_layout = fc_cell.Layout(period_x=0.8, # We with a period of 0.8 focal_distance_x=20.0,# We use a focal distance of 20.0. n_o_lines=30,#We set the number of lines to 30. min_x=10.0,#We set the first line at 10. fill_factor=0.2) #Here we set the fill factor to 0.2 meaning that lines will be 0.2 * period_x thick fc_layout.visualize(annotate=True)
Changing the start radii in the y direction:
# Example that illustrates the degrees of freedom at your disposal concerning the # periodicity and radii of the gratings in the y direction. You have more freedom in # y direction since the focus is in the x-axis. from technologies import silicon_photonics from ipkiss3 import all as i3 from picazzo3.fibcoup.curved import FiberCouplerCurvedGrating from picazzo3.traces.wire_wg import WireWaveguideTemplate # Creating the wire templates for the socket. start_wg_tmpl = WireWaveguideTemplate() start_wg_tmpl.Layout(core_width=0.5, cladding_width=2 * i3.TECH.WG.TRENCH_WIDTH + 0.5) end_wg_tmpl = WireWaveguideTemplate() end_wg_tmpl.Layout(core_width=17.0, cladding_width=2 * i3.TECH.WG.TRENCH_WIDTH + 17.0) fc_cell = FiberCouplerCurvedGrating(start_trace_template=start_wg_tmpl, wide_trace_template=end_wg_tmpl) fc_layout = fc_cell.Layout(focal_distance_x=20.0,# We use a focal distance of 20.0. n_o_lines=30, # We use 30 lines. period_x=0.8, # We with a period of 0.8 period_y=0.5, # period has to be smaller than the period in the x direction start_radius_y=3.0, # Start_radius_y has to be smaller than min_x fill_factor = 0.2, # Fill factor of 0.2 min_x = 10.0) #First line at 10.0 fc_layout.visualize(annotate=True)
Changing the socket extensions:
# Example demonstrating how to change the socket_extension. import technologies.silicon_photonics from ipkiss3 import all as i3 from picazzo3.fibcoup.curved import FiberCouplerCurvedGrating from picazzo3.traces.wire_wg import WireWaveguideTemplate # Creating the wire templates for the socket. start_wg_tmpl = WireWaveguideTemplate() start_wg_tmpl.Layout(core_width=0.5, cladding_width=2 * i3.TECH.WG.TRENCH_WIDTH + 0.5) end_wg_tmpl = WireWaveguideTemplate() end_wg_tmpl.Layout(core_width=17.0, cladding_width=2 * i3.TECH.WG.TRENCH_WIDTH + 17.0) fc_cell = FiberCouplerCurvedGrating(start_trace_template=start_wg_tmpl, wide_trace_template=end_wg_tmpl) fc_layout = fc_cell.Layout(period_x=0.8, # We with a period of 0.8 focal_distance_x=20.0, # We use a focal distance of 20.0. n_o_lines=30, #We set the number of lines to 30. min_x=10.0,#We set the first line at 10. box_width=40.0,# All the lines will be contained between -20 and 20 socket_extension=30.0) #A socket extension will of 30.0 will be added fc_layout.visualize(annotate=True)
Changing the straight socket extensions:
# Example demonstrating how to change the socket_straight_extensions. import technologies.silicon_photonics from ipkiss3 import all as i3 from picazzo3.fibcoup.curved import FiberCouplerCurvedGrating from picazzo3.traces.wire_wg import WireWaveguideTemplate # Creating the wire templates for the socket. start_wg_tmpl = WireWaveguideTemplate() start_wg_tmpl.Layout(core_width=0.5, cladding_width=2 * i3.TECH.WG.TRENCH_WIDTH + 0.5) end_wg_tmpl = WireWaveguideTemplate() end_wg_tmpl.Layout(core_width=17.0, cladding_width=2 * i3.TECH.WG.TRENCH_WIDTH + 17.0) fc_cell = FiberCouplerCurvedGrating(start_trace_template=start_wg_tmpl, wide_trace_template=end_wg_tmpl) fc_layout = fc_cell.Layout(period_x=0.8, # We with a period of 0.8 focal_distance_x=20.0,# We use a focal distance of 20.0. n_o_lines=30,#We set the number of lines to 30. min_x=10.0,#We set the first line at 10. box_width=40.0, socket_straight_extension=(10.0,5.0))# A straight extension of 10.0 will be added at the #narrow side and 5.0 at the wide part of the socket. fc_layout.visualize(annotate=True)
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