Vardit Eckhouse

Radio frequency photonic filter for highly resolved and ultrafast information extraction.

We present a method and devices for highly resolved carrier and information extraction of optically modulated radar signals. The extraction is done by passing the optical beam through a monitoring path that constitutes a finite impulse response filter. Replications of the monitoring signal realize the required spectral scan of the filter. Despite the fact that the filter configuration is fixed, each replication experiences different spectral filtering. The radar carrier is detected by observing the energy fluctuations in a low-rate output detector. The RF information is extracted by positioning a low-rate tunable filter at the detected carrier frequency.

Polarization-mode dispersion manipulation using periodic polarization modulation

In this paper we present a novel approach allowing cancellation of polarization mode dispersion (PMD) using a technique involving periodic polarization modulation, passing the optical signal through a polarizer and then sampling it. Digital post processing following the optical polarization modulation allows significant attenuation of the PMD component in the bit stream. Numerical and experimental verification is presented.

Subwavelength structure imaging

We expand conventional superresolving imaging systems toward extraction of suboptical wavelength structures. An imaging system that is capable of imaging subwavelength details is presented. Homogeneous waves carrying information on spatial frequencies exceeding the classical limit of resolution can be created by diffraction of evanescent waves. These homogeneous waves are able to pass through an imaging system. The high spatial frequencies can be recovered from these homogeneous waves by appropriate decoding. We present the theory of subwavelength structure imaging, depict a special holographic recording method that is eventually implemented in experimental validation in which subwavelengths details are imaged using a conventional imaging setup.

Evolution of ultrafast all-optical free-space switches

This paper presents innovative concepts related to the realization of ultra-fast optical switches, which are to be used in next-generation optical networks. Experimental measurements, which characterize the performance and reliability of such switches, are presented.

In-channel OSNR and BER measurement using temporal superresolution via dynamic range conversion

This paper presents a novel technique for obtaining super resolution using dynamic range conversion. The concept allows using low-rate electronics and a high dynamic range detector for extracting bit error rate and in-channel optical signal-to-noise ratio (OSNR) for high-rate signals.

Polarization-mode dispersion cancellation using periodic polarization modulation

In this paper we present a novel approach allowing cancellation of the polarization mode dispersion (PMD) using a technique involving periodic polarization modulation. A digital post processing following the optical polarization modulation allows significant attenuation of the PMD component in the bit stream.

Compact RF-photonic configuration for highly resolved and ultra-fast extraction of carrier and information of radar signal

A highly resolved carrier and information extraction of an optically modulated radar signal is presented. The extraction is done by passing the optical beam through a monitoring path that realizes an FIR filter. Replications of the monitoring signal realize the required spectral scan of the filter. Despite the fact that the filter configuration is fixed, each replication experiences different spectral filtering. The radar carrier is detected by observing the energetic fluctuations in a low rate detector. The RF information is extracted by positioning a low rate tunable filter at the detected carrier frequency.

Chromatic and polarization-mode dispersion monitoring device

In this paper we present a novel technique allowing monitoring the chromatic dispersion or the polarization-mode dispersion characteristics of the information within the optical channel. The technique is based upon mapping of the parameters that are to be monitored into measurements of the required multicasting or the variable attenuation of an optical switch and the minimal readout at the detector.

Dynamic sub-wavelength encryption

The suggested device includes a spatial light modulator (SLM) allowing varying the polarization state of an input illumination source. Attached to the SLM a sub wavelength grating is placed per each pixel of the device. This grating is used to encode the input information. The decoding is done by another sub wavelength grating. When the two gratings are attached a variation of the energetic efficiency between the two polarization states occurs. The polarization ratio encrypts the spatial information stream. The sub wavelength grating are hard to copy and thus high encryption capability is obtained.