Impact Avalanche Transit Time (IMPATT) device has emerged as the most suitable solid-state source to generate sufficiently high power in microwave, millimeter wave and terahertz frequencies. At high frequencies such as at 94 GHz InP IMPATT diodes in general have higher DC-to-RF conversion efficiency than all other well known material used for IMPATT diode such as, GaAs, Si due to some special reasons. The illumination of the active area of a microwave diode by an optical signal effectively acts as... Mehr