Polarization-independent tunable spectral slicing filter in Ti:LiNbO3.
Appl Opt
; 50(4): 562-70, 2011 Feb 01.
Article
en En
| MEDLINE
| ID: mdl-21283248
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 â¼1 nm and thermal tuning over a range of â¼13 nm are measured.
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MEDLINE
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En
Revista:
Appl Opt
Año:
2011
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Article
País de afiliación:
Estados Unidos