SELF-CALIBRATING CORRELATING RECEIVERS

    公开(公告)号:US20250112807A1

    公开(公告)日:2025-04-03

    申请号:US18904924

    申请日:2024-10-02

    Abstract: A circuit comprising a first Fourier Transform block operable to perform a Fourier Transform and having a first input configured for receiving an I signal and a second input configured for receiving a Q signal; a first plurality of n of outputs for I channels and Q channels each comprising a different frequency bin output from the Fourier Transform; I and Q summing blocks comprising a set of connector lines connecting an ith one of I channels with an ith one of the Q channels; an inverse Fourier Transform block connected to the summing blocks and operable to perform an inverse Fourier Transform; a correlator for correlating the outputs of the inverse Fourier Transform; a Fourier Transform block for Fourier Transforming the correlator output; a comparator for comparing the correlation term to zero; and an error correction circuit for tuning the magnitude and phase of the I and Q channels using the comparator output as feedback.

    ON-CHIP PHOTONIC ULTRA-SHORT-PULSE SYNTHESIZER

    公开(公告)号:US20250085607A1

    公开(公告)日:2025-03-13

    申请号:US18805408

    申请日:2024-08-14

    Abstract: An on-chip pulse synthesizer including an integrated photonic chip that temporally and spectrally shapes pulses of light using primarily quadratic optical nonlinearities. Through this synthesis, the light pulses undergo temporal shortening or reshaping, spectral broadening, wavelength conversion, or a combination thereof. A key aspect of this synthesis is the mode engineering of the waveguides, which includes converting the pump source mode to the relevant mode in the nonlinear optical region and tailoring the waveguide geometry and material stack to enable dispersion-engineering as well as engineering of the phase matching for various nonlinear processes.

    Method and apparatus for reducing the work function of polycrystalline metal hexaboride

    公开(公告)号:US12237137B2

    公开(公告)日:2025-02-25

    申请号:US17221170

    申请日:2021-04-02

    Abstract: Aspects include a method for treating a polycrystalline material, the method comprising: exposing a surface of the polycrystalline material to a plasma thereby changing the surface of the polycrystalline material from being characterized by a starting condition to being characterized by a treated condition; wherein: the surface comprises a plurality of crystallites each having the composition MB6, M being a metal element; the plasma comprises ions, the ions being characterized by an average ion flux selected from the range of 1.5 to 100 A/cm2 and an average ion energy that is less than a sputtering threshold energy; the starting condition of the surface is characterized by a first average work function and the treated condition of the surface is characterized by a second average work function; and the second average work function is less than the first average work function.

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