A potentially ultrafast optical analog-to-digital (A/D) converter scheme is proposed and was partly studied experimentally. In the A/D converter scheme the input signal controls the wavelength of a diode laser, whose output beam is incident on a grating. The beam from the grating hits a diffractive optical element in an array. The wavelength determines which element is illuminated. Each element fans out a unique spot-pattern bit code to be read out in parallel by individual detectors. In the experiment all patterns but one from 64 array elements were read out correctly.
Static dividers in 135-GHz InP-DHBT technology have been designed, fabricated, and measured. Circuits are operational from dc to 100 GHz. Due to limitations in available measurement equipment, adequate investigation of the circuit operation beyond 100 GHz is not possible at this time, however, to the authors' knowledge, this is already the highest toggling frequency reported in any static circuit in any technology. The circuit has a total area of 675 900 m 2 , with the core of the flip-flop occupying about 240 170 m 2 .
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