InP AAC for data compression applications

Spatial Light Modulation as a Flexible Platform for Optical Systems

“…The algorithm was implemented to generate a hologram that replicates the output of the four waveguides (WG) of an optical chip for data compression proposes [8,23,53]. A hologram of four beams was calculated by a phase-only superimposition of four independent holograms generated by Eq.…”

“…An integrated approach for compression applications implemented in an indium phosphide (InP) optical chip was fabricated to realize a Haar wavelet transform [53]. The HT is a wavelet-based method with promising attributes for compression transformation techniques.…”

“…The HT is a wavelet-based method with promising attributes for compression transformation techniques. Their application in image processing and pattern recognition due to its simple design, fast computation power, and efficiency can be easily realized by optical planar interferometry [53,56,57].…”

“…This filtering operation corresponds to the calculation of the average between two neighbors' pixel values (LP) or the difference between them (HP) [57]. The HT is implemented with a two-level network composed by three asymmetric adiabatic couplers (AAC) 2 × 2, reproducing the required operations, i.e., the average (sum) and the difference (subtraction) between the optical input pair [53]. The 2D HT can be decomposed in four sub-bands, LL, LH, HL, and HH [57].…”

“…The optical chip is composed of four distributed feedback (DFB) source lasers (L 1 -L 4 ), three asymmetric adiabatic coupler (AAC 1 -AAC 3 ), six positive-intrinsicnegative (PIN) photodiodes for network monitoring, six MMI splitters 1 × 2, one MMI splitter 2 × 2, and two spot size converters (SSC), at the correspondent HT network output LL (compression) and HH. Further details about the PIC can be found elsewhere [23,53].…”