Spatial-spectral holographic correlator at 1536 nm using 30-symbol quadriphase- and binary-phase-shift keyed codes

Abstract

Optical 30-symbol quadriphase-shift keyed (QPSK) and binary-phase-shift keyed (BPSK) codes were processed in a spatial-spectral holographic correlator with the Er(3+): Y(2)SiO(5) spectral hole-burning material operating at 1536 nm in the important 1550-nm communications band. The results demonstrate the ability of spatial-spectral holographic correlators to process QPSK codes and BPSK codes with the same apparatus. The high-fidelity correlations produced by this optical coherent transient device exhibit the low sidelobe characteristics expected for the codes used.

Hole-burning techniques for isolation and study of individual hyperfine transitions in inhomogeneously broadened solids demonstrated inPr3+:Y2Nilsson1, Rippe2, Kröll3 et al. 2004Phys. Rev. B1936830View full textAdd to dashboardCite

“…The applications include frequencydomain data storage, 2 time-domain data storage, 3,4 spectralspatial correlation, 5 temporal pattern recognition, 6 optical data processing, 7,8 radio-frequency spectrum analysis, 9 and the use of spectral holes as frequency references. 10,11 Rare-earth ions doped into crystalline hosts are particularly suited for study using nonlinear spectroscopic methods such as hole burning, 12 and for use in spectral hole-burning applications.…”

Laser frequency stabilization at 1.5 microns using ultranarrow inhomogeneous absorption profiles in Er3+:LiYF4

“…A small magnetic field of B ¼ 0.3 T was applied perpendicular to the c-axis of the crystal to lift the Kramers degeneracy. A magnetic field of this strength can easily be achieved by sandwiching the crystal between button-sized NdFeB permanent magnets [17]. The laser was propagated parallel to the c-axis and the light was polarized perpendicular to both the c-axis of the crystal and the magnetic field direction.…”

Experimental observation of spectral diffusion in an optically pumped crystal

“…During the last decades, optical coherent transients have been extensively studied for wideband signal processing, including radiofrequency-signal spectral analysis [1,2] correlation [3] and range-Doppler processing [4]. Although most experiments have been performed in Tm:YAG at 793 nm, Er-doped materials are of great interest in order to take advantage of off-the-shelf, low cost and high performance optical components developed at the telecommunication wavelength.…”