Update Segmented CPW notebook with LXT collaboration data

[yuanshen-flexcompute]

Updated the segmented CPW notebook to include comparison with experimental data from LXT.

[tomflexcompute]

Actually @yuanshen-flexcompute you need to edit the mapping json file in the misc folder too.

[github-actions]

Spell Check Report

CPWRFPhotonics2.ipynb:

Cell 101, Line 1: 'Luxtelligence'
  > ## Experimental verification of TFLT segmented CPW with Luxtelligence SA
Cell 102, Line 1: 'Luxtelligence'
  > In collaboration with Luxtelligence SA (LXT), we used the RF solver to simulate a range of segmented electrode designs in their thin-film lithium tantalate (TFLT) platform. The results were compared against measurements and simulations on other commercial software performed by LXT.
Cell 102, Line 3: 'datacom', 'five-fold', 'frequency-metrology', 'hour-scale', 'optical-comb', 'twenty-times', 'visible-to-telecom'
  > Compared to lithium niobate, thin-film lithium tantalate offers a five-fold improvement in hour-scale bias stability, supports modulation down to tens of hertz, exhibits approximately twenty-times lower birefringence, provides nearly double the optical power damage threshold, and features a larger bandgap. Together, these properties make thin-film lithium tantalate a very promising platform for advanced telecommunication and datacom components, such as arrayed waveguide gratings (AWGs); enable dispersion engineering for optical-comb generation; and support high-performance frequency-metrology systems, as well as quantum applications operating across the visible-to-telecom wavelength range.
Cell 102, Line 7: 'T-rail'
  > The high-frequency RF effective index should match the optical group index to enable high-speed data transmission. We performed a sweep of 12 T-rail designs from LXT (A1-A13) and sought to match the effective index at the RF frequency of 67 GHz. The results are presented below alongside actual measurement data from LXT. Additionally, results from a similar calculation performed by LXT using a different commercial EM solver are also included.
Cell 103, Line 12: 'bbbbbb'
  > ax.axhline(2.11, ls="--", color="#bbbbbb", label="C-band Target (n_group = 2.11)")

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