Merge pull request #7 from BYUCamachoLab/skandan

Add dbr component

Author: SkandanC

README.md

@@ -2,6 +2,25 @@
 
 Skywater photonics PDK for the SKY130 process node.
 
-## Usage
-
 ## Installation
+
+As of now, this PDK is not on PyPI.
+
+So, to install it, you would need to:
+
+1. Clone the repo
+2. cd into the repo
+3. Run `pip install -e .`
+
+## TODO
+
+- Add component library
+- Add tests
+- Test components
+
+## Authors
+
+- Skandan Chandrasekar
+- Sequoia Ploeg
+- Elise Bangerter
+- Joel Kartchner

sky130ph/__init__.py

@@ -7,5 +7,4 @@
 __author__ = "SkandanC <[email protected]>"
 from typing import List
 
-
 __all__: List[str] = []

sky130ph/components.py

@@ -1 +1,85 @@
 """Photonic component library."""
+
+
+import gdsfactory as gf
+from gdsfactory import cell, get_component
+
+
+@cell
+def _dbr_cell(
+    w1: float = 0.5,
+    w2: float = 0.65,
+    l1: float = 0.288,
+    l2: float = 0.288,
+    straight: gf.types.ComponentSpec = gf.components.straight,
+) -> gf.Component:
+    """Distributed Bragg Reflector unit cell.
+
+    Args:
+        w1: thin width in um.
+        l1: thin length in um.
+        w2: thick width in um.
+        l2: thick length in um.
+        n: number of periods.
+        straight: spec in um.
+
+    .. code::
+
+           l1      l2
+        <-----><-------->
+                _________
+        _______|
+
+          w1       w2
+        _______
+               |_________
+    """
+    l1 = gf.snap.snap_to_grid(l1)
+    l2 = gf.snap.snap_to_grid(l2)
+    w1 = gf.snap.snap_to_grid(w1, 2)
+    w2 = gf.snap.snap_to_grid(w2, 2)
+    c = gf.Component()
+    c1 = c << get_component(straight, length=l1, width=w1, cross_section="nitride")
+    c2 = c << get_component(straight, length=l2, width=w2, cross_section="strip")
+    c2.connect(port="o1", destination=c1.ports["o2"])
+    c.add_port("o1", port=c1.ports["o1"])
+    c.add_port("o2", port=c2.ports["o2"])
+    return c
+
+
+@gf.cell
+def dbr() -> gf.Component:
+    """Distributed Bragg Reflector.
+
+    .. code::
+
+    0.288um 0.288um
+    <-------><------>
+    ________        _______
+    |       |_______|
+    |       |       |
+    | 0.5um | 0.65um|       ...  10 times
+    |       |_______|
+    |_______|       |_______
+    """
+    c = gf.Component()
+    l1 = gf.snap.snap_to_grid(0.288)
+    l2 = gf.snap.snap_to_grid(0.288)
+    cell = _dbr_cell()
+    c.add_array(cell, columns=10, rows=1, spacing=(l1 + l2, 100))
+    starting_rect = c << gf.get_component(
+        "straight", length=l2, width=0.65, cross_section="strip"
+    )
+    starting_rect.move(starting_rect.center, (-0.144, 0))
+    c.add_port("o1", port=starting_rect.ports["o1"])
+    p1 = c.add_port("o2", port=cell.ports["o2"])
+    p1.center = [(l1 + l2) * 10, 0]
+    return c
+
+
+if __name__ == "__main__":
+    import gdsfactory as gf
+
+    c = dbr()
+    c.show()
+    print(c.to_yaml())