Examples from/for the photonics paper

The following condensed examples are going to be used in the gdsfactory photonics paper. Please make sure to keep a maximum of approx. 20 lines of code per example. For optimal rendering the examples should also avoid being too wide. If possible keep lines < 40 characters.

Fundamentals¶

You can add polygons to different layers. By default all units in gdsfactory are in um.

import gdsfactory as gf

gf.CONF.plot_height = 300 / 400*350
gf.CONF.plot_width = 350
gf.CONF.plot_oversampling = 5.0

import gdsfactory as gf
from gdsfactory.gpdk import PDK
PDK.activate()

# Create a blank component 
# (essentially an empty GDS cell 
# with some special features).
c = gf.Component()

# Add some geometry to it.
p1 = c.add_polygon(
    [(-8, -6), (6, 8), (7, 17), (9, 5)], 
    layer=(1, 0)
)

c # Plot it in jupyter notebook.

gf.CONF.plot_height = 420
gf.CONF.plot_width = 350

c = gf.Component()

# Create new geometry from the functions
# available in the geometry library.
t = gf.components.text("Hello!")
r = gf.components.rectangle(
    size=(5, 10), layer=(2, 0)
)

# Add references to the new geometry 
# to c, our blank component.
text1 = c.add_ref(t)

# Using the << operator (identical to add_ref()),
# add the same geometry a second time.
text2 = c << t
r = c << r  # Add the rectangle we created.

# Now that the geometry has been added to "c", 
# we can move everything around:
text1.movey(25)
text2.move((5, 30))
text2.rotate(45)
r.movex(-15)

c

gf.CONF.plot_height = 330
gf.CONF.plot_width = 350

@gf.cell
def mzi_with_bend(
      radius: float = 10.0
    ) -> gf.Component:

    c = gf.Component()
    mzi = c << gf.components.mzi(length_y=35)
    mzi.rotate(90)
    bend = c << (
        gf.components.bend_euler(radius=radius)
    )
    bend.connect("o1", mzi.ports["o2"])

    c.add_port("o2", port=bend.ports["o2"])
    c.add_port("o1", port=mzi.ports["o1"])

    return c

c_mzi_with_bend = mzi_with_bend(radius=12)
c_mzi_with_bend.draw_ports()
c_mzi_with_bend

c_mzi_with_bend.pprint_ports()

gf.CONF.plot_height = 210
gf.CONF.plot_width = 350

c = gf.Component()
mmi1 = c << gf.components.mmi1x2()
mmi2 = c << gf.components.mmi1x2()
mmi2.move((100, 40))

# Automatically route a waveguide 
# between the two MMIs
route = gf.routing.route_single(
    c,
    port1=mmi1.ports["o2"],
    port2=mmi2.ports["o1"],
    cross_section=gf.cross_section.strip,
)
c