Reduced Sidelobe Integrated Acoustooptic Filter using Birefringence Apodization
نویسندگان
چکیده
AOTF, acoustooptic filter, lithium niobate, integrated optics A two-section integrated acoustooptic tunable filter with significantly reduced sidelobes has been fabricated. The sidelobe reduction was achieved using birefringence apodization in the form of variable width Ti stripe waveguides. The design and fabrication of the device, which includes integrated proton exchanged TE and TM pass polarizers, is described. Experimental tuning curves for each filter section and the overall device are presented and compared with calculated results. The largest sidelobes were found to be 24 dB below the peak transmission, representing a 5.3 dB improvement over an ideal filter without birefringence apodization. The FWHM of the filter is 1.36 nm, which is only 16% larger than predicted for its interaction length of 17 mm per section.
منابع مشابه
Apodization of elliptical-core two-mode fiber acousto-optic filter based on acoustic polarization control.
We propose and demonstrate a novel apodization technique for an elliptical-core two-mode fiber acousto-optic filter by twisting the fiber and adjusting the acoustic polarization. The sidelobe suppression in the filter spectrum was improved from -9.7 to -15.5 dB. A theoretical analysis that includes acoustic birefringence explains the experimental results with good agreement.
متن کاملPerformance Enhancement of Spectrum Sliced Photonic Microwave Filter Using Parallel Fabry- Pérot Filters With High Profiled Windowing for WDM-ROF Link
Abstract—In this paper, the performance of spectrum sliced photonic microwave filter for Radio Over Fiber link is characterized. The proposed filter utilizes parallel Fabry-Pérot filters for spectrum slicing of a broadband source. The filter performance is characterized by measuring the overall Free Spectral Range, 3db Bandwidth, Quality factor and Main Lobe to Sidelobe Suppression level for di...
متن کاملA stable realization of apodization filtering applied to noise SAR and SAR range sidelobe suppression
Pulse response of radar system always suffers from high sidelobe level resulting in resolution degradation. Investigated here is a sidelobe suppression method based on apodization filtering technique for range responses of synthetic aperture radar (SAR) and noise SAR systems. The core of apodization filtering is finding an appropriate filtering vector in time domain. Compared with original apod...
متن کاملSilicon photonic bandpass filter based on apodized subwavelength grating with high suppression ratio and short coupling length.
A compact silicon bandpass filter with high sidelobe suppression is proposed and experimentally demonstrated using an apodized subwavelength grating (SWG) coupler. The device is implemented by placing a SWG waveguide next to a strip waveguide, and apodization is employed with a Gaussian profile to taper the gap between the two waveguides. A high sidelobe suppression ratio of 27 dB can be obtain...
متن کاملEuler-Bessel and Euler-Fourier Transforms
We consider a topological integral transform of Bessel (concentric isospectral sets) type and Fourier (hyperplane isospectral sets) type, using the Euler characteristic as a measure. These transforms convert constructible Z-valued functions to continuous R-valued functions over R n. Core contributions include: the definition of the topological Bessel transform; a relationship in terms of the lo...
متن کامل