Frequency up-conversion is an effective method of mid-infrared (MIR) detection by converting the long-wavelength photons to visible domain, where efficient detectors are readily available. Here, we generate MIR light carrying orbital angular momentum (OAM) from a difference frequency generation process and perform it via sum conversion in bulk quasi-phase-matching crystal. The maximum quantum e...

<span lang="EN-US">This paper presents the design of a pseudomorphic high electron mobility transistor (pHEMT) self-oscillating mixer (SOM) for millimeter wave wireless communication systems. The 180° out-of-phase technique is chosen to both improve desired lower sideband (LSB) signal and achieve satisfactory rejection unwanted signals (LO, USB IF). This SOM designed on PH15 process UMS f...