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VPH Technology
HT Technology

Technology Background:  HT - Designs at the “Sweet Spot”

  • VPH transmission grating technology offers for a given wavelength two grating frequencies where theoretically the diffraction efficiency of both ‘s’ (TE) and ‘p’ (TM) polarized light can simultaneously reach 100%.
  • At 1545 nm these grating frequencies are 940 lines/mm and 1350 lines/mm.
  • The UltraSpec™-HT940 and the UltraSpec™-HT1350 are designed at these grating frequencies respectively. This is why they offer minimized PDL and earn the HT designation.

 

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