pbs_e_skid component added to the library of beta components

[AndrazDebevc]

I added the polarization beam splitter component to the pdk. I included the link to the paper and I used the "Make SiEPIC Component from cell" tool to generate the ports and labels. Did I upload the gds file to the right directory?

Please let me know, if there is something I should modify/add.

Andraz

[lukasc-ubc]

Looks good! Request:

1) instead of the top cell being "TOP", replace with the file name. Remove the unused cells (waveguides).

2) file/cell name, suggestion: pbs_1550_eskid (we have eskid instead of e_skid in the Waveguides.XML configuration).

3) suggest adding another text which provides a brief description, e.g., Polarization Beam Splitter Input: TE & TM 1550 in opt3 (or is it opt2?) Output: TM in opt4, TE in opt1

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 73.35%. Comparing base (ada3345) to head (684f218).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #294 +/- ## ======================================= Coverage 73.35% 73.35% ======================================= Files 96 96 Lines 11706 11706 ======================================= Hits 8587 8587 Misses 3119 3119 ```

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