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Polarization-independent tunable spectral slicing filter in Ti:LiNbO3.

Authors
  • Rabelo, Renato C
  • Eknoyan, Ohannes
  • Taylor, Henry F
Type
Published Article
Journal
Applied Optics
Publisher
The Optical Society
Publication Date
Feb 01, 2011
Volume
50
Issue
4
Pages
562–570
Identifiers
DOI: 10.1364/AO.50.000562
PMID: 21283248
Source
Medline
License
Unknown

Abstract

A two-port polarization-independent tunable spectral slicing filter at the 1530 nm wavelength regime is presented. The design utilizes an asymmetric interferometer with a sparse index grating along its arms. The sparse grating makes it possible to select equally spaced frequency channels from an incident WDM signal and to place nulls between them to coincide with the signal comb frequency. The number of selected channels and nulls between them depends on the number of coupling regions used in the sparse grating. The free spectral range depends on the spacing between the coupling regions. The Z-transform method is used to synthesize the filter and determine the spectral response. The operation of a device with six coupling regions is demonstrated, and good agreement with theoretical predictions is obtained. A 3 dB bandwidth of ∼1 nm and thermal tuning over a range of ∼13 nm are measured.

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