Parallel-shift register and binary multiplier using optical hardware components

Abstract

An optical four-bit parallel-shift register that consists of four serially connected optical flip-flop memories is driven by common clock pulses. Each optical flip-flop consists of two coupled polarization switches that share an all-optical demultiplexer, which makes the optical flip-flops easily connected with each other to form a parallel-shift register. The optical flip-flops are controlled by clock pulses. The parallel-shift register and an optical parallel adder are used to demonstrate an alloptical binary multiplier and its optical control circuit. The concept is demonstrated at an operation speed of 10 MHz for registers and 1 MHz for a multiplier, which is limited by long laser cavities formed by the optical fiber.

All-Optical Pseudorandom Binary Sequence (PRBS) Generator Using The Hardlimiters

“…Inputs A and B gets combined into a single beam. The transmitted intensity is defined as the O1 output and the reflected value as the output O2 [11,12]. We bias the hardlimiter at a=2.…”

“…The structure of the all-optical flip-flop memory is depicted in Figureure 4 as designed in reference [11]. It consists of two coupled polarization switches (PSWs).…”

“…The first PSW1 output light is injected into the second PSW2. Hence, the light that PSW1 outputs acts as a saturating control signal for SOA2 that can suppress PSW2 and the light that PSW2 outputs can act as a saturating control signal for the SOA1 to suppress PSW1 [11,15]…”

“…In this paper we have implemented an all optical PRBS generator exactly in a same fashion like its electronic counterpart with minimum complexity by using D flip-flop. Where Hardlimiter based Demultiplexer has been used as a basic element of a D flipflop [10][11]. According to the field theory all flip flops are connected in series one after another.…”

All Optical Ovsf Code Generator Realization Using Optical Flip Flop and Optical Hardlimitters

“…The emergence of increasingly high speed and the number of users in optical communication systems demands the OVSF codes technique in the optical communication links. The performing of signal processing operations entirely within the optical domain would exploit the speed and parallelism inherent to optics [2].…”