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

Summary: Duty cycle dependence of a periodically poled
LiNbO3-based electro-optic Solc filter
Eyal Rabia and Ady Arie
We demonstrate that the performance of a periodically poled LiNbO3- (PPLN-) based electro-optic Solc
filter is dependent on the duty cycle of the crystal. This may limit the performance of the device for
applications such as add­drop filtering and switching, owing to the deterioration of the extinction ratio.
It is shown that by adding a retarder to the Solc 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. © 2006 Optical Society of
America
OCIS codes: 120.2440, 230.2090, 260.1440.
1. Introduction
Periodically poled LiNbO3 (PPLN) was extensively
studied in the past decade for quasi-phase-matched
nonlinear interactions.1 However, the reversal of the
ferroelectric domains in this material reverses not
only the nonlinear coefficient but also the electro-
optic coefficient. The reversal of electro-optic coeffi-
cient r33 was used previously for demonstrating

  

Source: Arie, Ady - Department of Electrical Engineering-Physical Electronics, Tel Aviv University

 

Collections: Engineering