公开(公告)号：US20240213649A1

公开(公告)日：2024-06-27

申请号：US18539877

申请日：2023-12-14

Applicant: California Institute of Technology

Inventor： Razi U. Ahmed ,  Vladimir S. IItchenko ,  Ninoslav Majurec ,  Dmitry V. Strekalov ,  Andrey B. Matsko

IPC: H01P7/10 ,  G02B6/122 ,  H01P1/213

CPC classification number: H01P7/105 ,  G02B6/1225 ,  H01P1/213

Abstract: A device useful as a receiver including a waveguide interface to an antenna guiding a radio frequency (RF) signal to an RF waveguide cavity coupling the RF signal to a crystal resonator. The crystal resonator comprises a nonlinear material generating an optical output in response to a nonlinear interaction between the RF signal and an optical pump in the resonator. An optical port coupled to the crystal resonator for outputting the optical output from which the RF signal received on the antenna can be determined.

公开(公告)号：US10698095B1

公开(公告)日：2020-06-30

申请号：US14857810

申请日：2015-09-17

Applicant: California Institute of Technology

Inventor： Eva Peral ,  Simone Tanelli ,  Chaitali R. Parashare ,  Douglas L. Price ,  Ninoslav Majurec

IPC: G01S13/02 ,  G01S7/288

Abstract: Systems and methods in accordance with embodiments of the invention transmit and detect electromagnetic signals using an offset IQ modulation technique. Offset IQ modulation systems use a digital to analog converter to generate a transmitted waveform that is frequency offset from direct current by an amount equal or larger than half the signal bandwidth, so that the level of any local oscillator leakage present within the frequency band containing the transmitted signal is insignificant. When the transmitted signal is received, an IQ mixer is also used to down convert the received signal. In many embodiments, the down converted signal is over sampled and provided to a digital signal processing system to perform linear filtering to remove intermodulation and/or crossmodulation components that can be introduced by nonlinearities in components such as (but not limited to) Power Amplifiers, Low Noise Amplifiers and/or the IQ mixer used during the down conversion.