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The PCI diagnostic is an internal reference interferometer that creates animage of absolutely calibrated electron density fluctuations integrated alongthe line of sight of the probing light beam. While conventional PCI diagnosticsinstalled on fusion experiments worldwide employ light of wavelength equal to10.59 $\mu$~m, the same system using light at 1.55 $\mu$~m wavelength wouldextend the spectral response in wave-number and frequency by factors of sevenand over one hundred, respectively, thereby potentially providing quantitativemeasurements of the internal structure of density perturbations induced byeither turbulent or radio-frequency waves, simultaneously covering ion toelectron gyro-radius scales up to the GHz frequency region. Based on apreviously developed 1.55 $\mu$~m PCI prototype system, constraints to thedesign for such a diagnostic in fusion grade devices are presented and comparedto those faced with the conventional method.

Design considerations for an ultrahigh-bandwidth Phase 6 Contrast Imaging system applied to fusion grade devices