Duty cycle dependence of a periodically poled LiNbO3-based electro-optic Sole filter

Eyal Rabia*, Ady Arie

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

We demonstrate that the performance of a periodically poled LiNbO 3- (PPLN-) based electro-optic Sole filter is dependent on the duty cycle of the crystal. This may limit the performance of the device for applications such as add-drop filtering and switching, owing to the deterioration of the extinction ratio. It is shown that by adding a retarder to the Sole filter it is possible to improve the extinction ratio; thus the dependence of the filter on the duty cycle can be reduced. Using Jones calculus, we analyzed the effect of a variable retarder that can also be rotated on the extinction ratio. We experimentally observed a 6 dB increase in the extinction ratio when we used a half-wavelength retarder.

Original languageEnglish
Pages (from-to)540-545
Number of pages6
JournalApplied Optics
Volume45
Issue number3
DOIs
StatePublished - 20 Jan 2006

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