Abstract
A polarization-independent two-port guided-wave electrooptically tunable bandpass filter with programmable
spectral output in Ti:LiNbO<sub>3</sub> at the
1530-nm wavelength regime is presented. The design utilizes an asymmetric interferometer with interdigital electrode
sets on its arms that allow the control of the polarization coupling coefficient on individual sets electronically
for the simultaneous tuning and apodization of the spectral output. The operation of a device with 16 electrode sets
is demonstrated, and good agreement with theoretical predictions is obtained. The number of selectable channels
depends on the number of electrode sets. A 3-dB bandwidth of ~1 nm and a tuning range of 10 nm are measured. Nearest sidelobes ~20 dB below the main peak are realized. Fiber-to-fiber insertion loss is < 4.6 dB. The maximum voltage that is used for selecting channels at ±4.8 nm away from the center channel wavelength
with apodization is 17.3 V.
© 2007 IEEE
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