Acousto-optic Bragg diffraction in a LiNbO3 channel-planar composite waveguide with application to optical computing

Abstract

Successful experimentation on acousto-optic Bragg diffraction in a LiNbO3 composite waveguide that consists of an array of parallel but uncoupled channel waveguides directly extended to a single-mode planar waveguide and a titanium-indiffused proton-exchanged (TIPE) microlens array is reported for the first time. A channel-waveguide array, a planar waveguide, a linear TIPE microlens array, a 500-MHz surface acoustic wave transducer, and an integrating lens have all been integrated in a substrate size of 0.2×1.0×2.0 cm to form an integrated acousto-optic Bragg modulator that should find a variety of applications in optical computing, signal processing, and communications. The resulting modulator module has been utilized to perform matrix-vector multiplication.

Photonic applications of lithium niobate crystals

“…Due to the relatively large index change given by proton exchange short focal length can be obtained. Both individual lenses and microlenses arrays have been formed [66]. In Fig.…”

“…The usual proton exchange method generate the Fig. 7 Integrated lenses produced by PE in an acoustooptic integrated device [66]. Bragg grating in the Ti waveguide, Fig.…”

Applications of surface acoustic and shallow bulk acoustic wave devices

“…As an alternative to the SAW compressive receiver which provides outputs serially in time, SAW-based integratedoptics spectrum analyzers ((OSA) employing SAW Bragg cells find application at input frequencies ::::1 GHz where there is a close match between SAW and optical fields, with bandwidth capability < 1 GHz [26], [28]. The SAW Bragg cells can be employed in high•speed AO computing systems [38], [238], [239]. In the acoustooptic (AO) spectrum analyzer depicted in Fig.…”

Electrooptic Behaviour of Proton Exchanged LiNbO3 Optical Waveguides

“…The normalized parameter Vdb" 2 dV (5) can be found by means of normalized dispersion diagrams for the given index profile of the guide. The normalized parameter Vdb" 2 dV (5) can be found by means of normalized dispersion diagrams for the given index profile of the guide.…”

“…Several passive components, e.g. By the combination of the TI process with a following proton exchange, encouraging results were obtained, especially in the field of compact acoustooptic devices [5]. Mach-Zehnder interferometric modulators [3], and sensors [4] have already been demonstrated.…”