Technolgy file archetecture revised with dictionary input method

mxpic/components/composites/SptTree.py

@@ -1,3 +1,5 @@
+"""Optical splitting tree composite layouts."""
+
 from typing import Any
 import nazca as nd
 import numpy as np
@@ -10,25 +12,29 @@ from ..primitives.pic import *
 
 ## Class for splitting tree 
 class SplittingTree():
-    '''
-    Class for generating splitting tree. 
+    """Binary splitter tree built from repeated Y-branch cells.
 
-    Paras:  
-        1. ybranch          [class] (Default None)
-            - length    (Default: 28)   Length of the ybranch 
-            - width     (Default: 2)    Pitch between two output waveguides 
-            - w_wg      (Default: 0.45) Width of output waveguide 
-            - cell      (Default: box)  
-                - a1    [Pin] Input waveguide 
-                - b1    [Pin] Output waveguide1 
-                - b2    [Pin] Output waveguide2 
-        2. output_number    [-]     (Default: 16)
-            Number of output channels(Need to be 2^N)
-        3. bend_radius      [um]    (Default: 10)
-            Bend radius used to connect the different layer of Y branch 
-        4. output_pitch     [um]    (Default: None)
-            Can define the pitch of output channel(If ==None, then pitch=self.width, which is the minimum pitch)
-    '''
+    Parameters
+    ----------
+    ybranch : Any, optional
+        Y-branch object with a ``cell`` attribute and ``a1``, ``b1``, and
+        ``b2`` pins. If omitted, a simple box-based Y-branch is generated.
+    output_number : int, optional
+        Number of output channels. Values are coerced to the nearest lower
+        power of two when needed.
+    bend_radius : int, optional
+        Bend radius used to route between splitter levels.
+    output_pitch : Any, optional
+        Output channel pitch in microns. If omitted, the Y-branch output
+        pitch is used.
+    show_pins : bool, optional
+        Show Nazca pin stubs in the generated layout.
+
+    Attributes
+    ----------
+    cell : nazca.Cell
+        Generated splitting tree layout cell.
+    """
 
     def __init__(self, ybranch: Any=None, output_number: int=16, bend_radius: int=10, output_pitch: Any=None, show_pins: bool=False) -> None:
         if ybranch == None: