Abstract: Disclosed a quantum-communication transmitter system comprising a light source configured to generate coherent light, a Mach-Zehnder modulator optically coupled to the light source and configured to simultaneously modulate phase and amplitude of the coherent light generated by said light source, and a driving unit electrically coupled to the Mach-Zehnder modulator and configured to apply electric modulating voltage signals to one single modulating input of the Mach-Zehnder modulator, to thereby cause the Mach-Zehnder modulator to generate phase and amplitude modulated coherent light pulses for implementing a four quantum states time-bin encoding scheme for qubits transmission over a quantum communication channel.

Abstract: Techniques, methods and system, for synchronization of sparse data signals are disclosed, comprising mixing a serial stream of sparse data signals with a serial stream of synchronization signals, to thereby add redundancy to the serial stream of sparse data signals and enable clock regeneration from a serial stream of mixed signals produced by said mixing, emulating the serial stream of synchronization signals by applying the clock regeneration to the serial stream of mixed signals, and generating a stream of parallel synchronization signals having a frequency of the serial stream of synchronization signals, deserializing the serial stream of mixed signals into a stream of parallel mixed signals having a data rate lower than a data rate of the serial signal streams, and demixing the stream of parallel synchronization signals with the stream of parallel mixed signals and thereby removing the redundancy introduced by the mixing into the sparse data signals and generating a parallel stream of demixed signals sub

Abstract: At various positions in an eye motion box (EMB) an output image from an optical device can be captured and analyzed for detection and evaluation of image propagation via the optical device. Optical testing along a specific axis can evaluate optical engine transfer function uniformity across facet's active area, detect the existence and degree of “smearing” of a projected image from an optical device, and detect the existence and degree of a “white stripes” (WS) phenomenon related to scattering and diffraction in the wedge-to-LOE interface. A variety of metrics can be derived for quality control and feedback into the production system, and for disposition of the optical devices.

Abstract: A near-eye display has a light-guide optical element (LOE) with two major parallel external surfaces. An image projector introduces image illumination into the LOE so as to propagate by internal reflection. The image projector includes one or more light-generating laser diode operated by a controller. A coupling-out arrangement includes a set of mutually-parallel, partially-reflective surfaces associated with the LOE at an oblique angle to the major external surfaces for coupling the illumination out of the LOE towards the eye of the observer. The light-generating laser diode has a characteristic variation of coherence length of generated light as a function of diode actuation power. The controller actuates the laser diode at a level of diode actuation power that generates light with a coherence length that is less than twice a spacing between adjacent partially-reflective surfaces of the coupling-out arrangement.

Abstract: A near-eye display has a light-guide optical element (LOE) with two major parallel external surfaces. An image projector introduces image illumination into the LOE so as to propagate by internal reflection. The image projector includes one or more light-generating laser diode operated by a controller. A coupling-out arrangement includes a set of mutually-parallel, partially-reflective surfaces associated with the LOE at an oblique angle to the major external surfaces for coupling the illumination out of the LOE towards the eye of the observer. The light-generating laser diode has a characteristic variation of coherence length of generated light as a function of diode actuation power. The controller actuates the laser diode at a level of diode actuation power that generates light with a coherence length that is less than twice a spacing between adjacent partially-reflective surfaces of the coupling-out arrangement.

Abstract: At various positions in an eye motion box (EMB) an output image from an optical device can be captured and analyzed for detection and evaluation of image propagation via the optical device. Optical testing along a specific axis can evaluate optical engine transfer function uniformity across facet's active area, detect the existence and degree of “smearing” of a projected image from an optical device, and detect the existence and degree of a “white stripes” (WS) phenomenon related to scattering and diffraction in the wedge-to-LOE interface. A variety of metrics can be derived for quality control and feedback into the production system, and for disposition of the optical devices.