β Scribed by Alastair D. McAulay
No coin nor oath required. For personal study only.
A novel arithmetic unit is proposed consisting of a pipelined optical ripple carry adder that adds two words with bits multiplexed by di erent wavelengths on a single ΓΏber. The addition result is returned to a ΓΏber bus in the same format as the incoming words. The corresponding operand bit pairs are split o the ΓΏber using wavelength division demultiplexers. Full adders compute the sum for each bit pair and the carry from the next lower signiΓΏcant bit pair. The full adder uses couplers and NOT, NOR and novel XOR logic gates constructed using semiconductor optical ampliΓΏers for gain and wavelength shifting.
π SIMILAR VOLUMES
A simple one-step fully parallel trinary signed-digit arithmetic is proposed for parallel optical computing. This technique performs multidigit carry-free addition and borrow-free subtraction in constant time. The trinary signed-digit arithmetic operations are based on redundant bit representation o