An analog photonic down-conversion link with simultaneous IMD3 distortion suppression and dispersion-induced power fading compensation

Spurious-free dynamic range enhancement of a single sideband phase-modulated link

“…5(a), the slope of IMD3 is 3, which indicates that the conventional phase-modulated link is limited by the IMD3 component. Assuming that the proposed MPL is a shot noise limited link, the noise floor can be estimated as −166 dBm, 16 and an SFDR of 105.78 dB·Hz2/3 is obtained. As is shown in Fig.…”

“…Most photonic schemes usually generate complementary IMD3 components to cancel out each other using Mach–Zehnder modulators (MZMs), 12 a dual-parallel (DP) Mach–Zehnder modulator, 13 , 14 or a DP polarization modulator 15 – 17 However, the complexity of structures is introduced, and the bias drifting problem is inevitable based on intensity modulation. As an alternative choice, a linearized MPL can be realized based on phase-modulation, which is free of bias drifting problems 18 …”

Linearized microwave downconversion link based on fast and intelligent impairment equalization for noncooperative systems

“…Nevertheless, the nonlinearity of the modulator is one of the main problems that may lead to the intermodulation distortion (IMD), in particular the thirdorder IMD (IMD3), which would degrade the spurious free dynamic range (SFDR) [5] . So far, several effective schemes have been reported to improve the linearity of downconversion links, including (i) employing cascaded modulators combined with an optical filter [6][7][8] , and (ii) using one dual-polarization quadrature phase shift keying (QPSK) Mach-Zehnder modulator (MZM) and two photodetectors (PDs) [9] . However, most microwave photonic-based systems, in particular the array radar systems and electronic reconnaissance systems, are built up based on simple intensity modulation and direct detection (IM-DD).…”

Research on the performance improvement of microwave photonic frequency down-conversion link

“…A single dual-parallel Mach-Zehnder modulator (DPMZM) is employed to compose a microwave photonic frequency conversion link with a lower NF and a higher SFDR [8] , while carrier suppression single sideband modulation is utilized to further improve the SFDR [9] . Furthermore, by introducing an appropriate phase shift to the optical sidebands, a photonic down-conversion link with simultaneous third-order intermodulation distortion suppression and dispersion-induced power fading compensation is achieved [10] .…”