strip-to-slot: center pins around y=0

[mustafacc]

Slight changes to geometry to make the cell symmetric around y. makes things a lot easier for connect_cell transformations...

Before:

After:

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.33%. Comparing base (dfca8a4) to head (b24db10).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #323   +/-   ##
=======================================
  Coverage   73.33%   73.33%           
=======================================
  Files         105      105           
  Lines       12730    12730           
=======================================
  Hits         9336     9336           
  Misses       3394     3394           

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[lukasc-ubc]

Any simulations on the insertion loss? How do the two cells compare?

[lukasc-ubc]

@mustafacc ?

[mustafacc]

I don't think they'd be any different, other than the direction of the waveguides; but in any case I simulated both

pre-commit

post-commit

[lukasc-ubc]

One possibility is that the slot waveguide loss will be higher for the diagonal design, due to the quantization of the EBL. It may be interesting to compare and see if there is a difference.

Given that it is a relatively large change to the design, my suggestion is to have two separate cells, rather than modifying the existing one.

e.g., strip-to-slot, strip-to-slot-v2.

[lukasc-ubc]

@mustafacc could you make two versions?

thanks