The Micro ATX (20 GHz RFoF Transmitter) is APIC Copr.’s latest high-performance RF over fiber product for telecommunications applications such as microwave, DAS, 5G and MIMO. RF over Fiber is becoming a key technology in the U.S. military’s pursuit of information dominance over increasingly higher bands of the RF spectrum. The analog signal attenuation in shielded copper COAX cables increases proportionally with the RF frequency. Above 20 GHz, COAX can only be used for very short distances. The current practice is to channelize, down-convert and digitize high frequency signals. Conversely, the signal attenuation in single mode fiber is less than 0.5 dB per kilometer, independent of the RF frequency. Fiber can be used to efficiently transport analog signal over great distances in their native form/frequency. The challenge with RF over Fiber is getting a link with sufficiently high dynamic range and low noise. The Micro ATX combines a best in class ultra low-noise (RIN = -168 dB/Hz) continuous wavelength (CW) laser (1530-1565 nm), a low Vπ AM modulator, a low noise amplifier, power conditioning and control electronics into a very small, yet, very rugged package (14 cm x 5 cm x 2 cm). When used in combination with APIC’s highly linear analog receiver, the resulting link performance, with/without a selectable low noise amplifier (LNA), has a gain greater than 8/-6 dB; a noise figure (NF) lower than 8/21 dB; an SFDR ~111/114 dBŸHz-2/3; and an RF bandwidth from 50 MHz through 20 GHz. The Micro ATX is dual use technology suitably rugged for military applications on tactical aircraft, surface and sub surface vessels; built to operate in harsh environments and ambient temperatures from -40oC to 70oC. Full specifications available at http://www.apichip.com/check-out-apics-complete-systems-today/.