Tel Aviv University

Technology Innovation Momentum Fund (israel) Limited Partnership

Dsit Solutions Ltd.

Avishay Eyal

Shaul Ozeri

Meir Hahami

Yakov Botsev

Israel Gannot

Nadav Arbel

Eyal Leviatan

Haniel Gabai

Idan Steinberg

A method includes generating a sequence of multiple optical pulses, for transmission into an optical fiber () having an array of multiple equally spaced reflectors () embedded therein, the sequence having a pulse duration and a pulse repetition interval (PRI) that guarantee that reflections of any of the optical pulses from any of the reflectors do not overlap. The sequence of optical pulses is transmitted into the optical fiber. The reflections of the optical pulses from the reflectors are extracted from the optical fiber. One or more events affecting the optical fiber are identified by analyzing the reflections.

Interrogation of arrays of equally spaced weak reflectors in optical fibers

An apparatus includes an electronic circuit, an electro-acoustic transducer and a coupler. The electronic circuit is configured to receive data to be transmitted over an optical cable, and to convert the data into a modulating signal. The electro-acoustic transducer is configured to convert the modulating signal into an acoustic wave. The coupler is configured to be mechanically coupled to a section of the optical cable, and to apply to the section a longitudinal stretching force that varies responsively to the acoustic wave, so as to modulate the data onto an optical carrier traversing the optical cable.

Coupling sensor information to an optical cable using ultrasonic vibrations

An apparatus () includes an electronic circuit (), an electro-acoustic transducer () and a coupler (). The electronic circuit is configured to receive data to be transmitted over an optical cable (), and to convert the data into a modulating signal. The electro-acoustic transducer is configured to convert the modulating signal into an acoustic wave. The coupler is mechanically coupled to a section of the optical cable, and is configured to apply to the section a longitudinal strain that varies responsively to the acoustic wave, so as to modulate the data onto an optical carrier traversing the optical cable.

A system () for fiber-optic reflectometry includes an optical source (), a beat detection module (A,B) and a processor (). The optical source is configured to generate a non-linearly-scanning optical interrogation signal having an instantaneous optical frequency that is a non-linear function of time. The beat detection module is configured to transmit the optical interrogation signal into an optical fiber (), to receive from the optical fiber an optical backscattering signal in response to the optical interrogation signal, and to mix the optical backscattering signal with a reference replica of the optical interrogation signal, so as to produce a beat signal. The processor is configured (i) to hold a predefined function that is indicative of an expected phase of the beat signal resulting from the non-linearly-scanning optical interrogation signal as a function of position along the optical fiber and time, (ii) to estimate a backscattering profile of the optical fiber by applying the predefined function to the beat signal, and (iii) to sense one or more events affecting the optical fiber by analyzing the backscattering profile.

Non-linear frequency scan optical frequency-domain reflectometry having a processor to estimate a backscattering profile of an optical fiber by applying a predefined function to a beat signal

A system () for fiber-optic reflectometry includes an optical source (), a beat detection module () and a processor (). The optical source is configured to generate an optical interrogation signal that is transmitted into an optical fiber (). The beat detection module is configured to receive from the optical fiber an optical backscattering signal in response to the optical interrogation signal, and to mix the optical backscattering signal with a reference replica of the optical interrogation signal using In-phase/Quadrature (I/Q) mixing, so as to produce a complex beat signal having In-phase (I) and Quadrature (Q) components. The processor is configured to sense one or more events affecting the optical fiber by analyzing the I and Q components of the complex beat signal.

Spectrally efficient optical frequency-domain reflectometry using I/Q detection

Method for examining bone in vivo, comprises obtaining a laser beam; modulating the laser beam to insert therein photoacoustic frequencies including optical frequencies and acoustic frequencies, the acoustic frequencies being able to give rise to acoustic waves; directing the modulated beam at a bone to cause acoustic waves resulting from the beam to travel through the bone; analyzing received signals from the bone including signals resulting from the acoustic waves, to determine a mineral density and a bone quality for said bone, and thus obtain in-vivo data that can be of assistance to a doctor when diagnosing osteoporosis.

Growing community of inventors

Giv′at-Shmuel, Israel

Avishay Eyal