v2.1.0

cspdk 2.1.0 checks design rules in the cells and fixes the cells that broke CORNERSTONE's rules. It also lets each flavour's DRC use its own rules, adds a submission checker for MPW Run 50 (designs due 11 November 2026), and adds a sample project for every flavour.

Changes that affect existing designs

• Cells reject gaps below the design-rule minimum (#406). A gap parameter below its flavour's minimum now raises a ValueError.

  • A value exactly at the minimum passes.

  • None, meaning the cell's default geometry, isn't checked.

  • The minimums come from the CORNERSTONE design guidelines:

    Flavour	gap_min (µm)	grating_gap_min (µm)
    si220, si340, si500	0.2	0.25
    sin200	0.2	0.2
    sin300	0.25	0.25

• Cells that broke CORNERSTONE's rules have new defaults (#387):

  • si340 and si500 grating_coupler_elliptical, all variants: 350 nm unetched ridges, as si220 has had since 2.0.0.
  • si340 grating_coupler_elliptical_so: a new trenches_extra_angle parameter (default 9), set to 11 so the first trenches reach 200 nm beyond the waveguide.
  • sin300 coupler and coupler_straight: default gap 0.25 µm (was 0.236).

• DRC uses each project's PDK name (#421). cspdk no longer fixes pdk = "cspdk" in its DRC settings, so GDSFactory+ checks a project against the rules of the flavour set in its pdk.name, for example cspdk.si340.

• si220 circulax heater (#386):

  • ThermalPhaseShifter now uses the same phase convention as the SAX models, exp(+1j·φ).
  • Its defaults now match SAX's straight_heater_metal: C-band strip neff 2.38, ng 4.30, dispersion, 3 dB/cm.
  • Mixed SAX and circulax circuits, such as the thermal MZI sample, now agree, and their results change.

New

• MPW Run 50 submission checker (#389): cspdk.si220.submission.check_submission(path) checks the submission rules from the 50th-call design guideline that geometric DRC doesn't cover. A guide comes with it.
• Sample projects for si340, si500, sin200, si_sus and ge_on_si (#407). Every flavour now has one.
• Docs (#405): a models page per flavour, giving each SAX model's parameters, defaults and spectrum, plus published notebooks.

Bug fixes

• si340 and sin300 die use die_frame_with_pads instead of the deprecated die_with_pads. The geometry is unchanged (#403).
• si220 wire_corner45_straight and sin200 die_frame no longer log kfactory duplicate-name errors (#412).
• The si220 sample notebook runs with GDSFactory+ 2.x (#414).

Packaging, CI and tests

• The release workflow creates the GitHub release from this file, and can be re-run safely (#388).
• CI workflow templates synced; code-security scanning (Semgrep, Trivy) now runs (#414).
• Tests:
  • every SAX model is finite, passive and reciprocal (#404);
  • regression data for every model's parameters and defaults (#409);
  • no duplicate cell names (#412);
  • a manifest of reference-file hashes (#413).