Due to their significance in several applications, including optical networks, optical random memory, and photonic encryption/decryption, optical latches have garnered academic attention.

It has recently been suggested that the technology of carrier reservoir semiconductor optical amplifiers (CR-SOA) is a useful substitute for conventional SOAs because it provides faster gain and phase recovery, enabling all-optical Boolean operations and, consequently, all-optical logic functionalities to be performed at faster speeds.

In a study published in Optics and Laser Technology, investigating CR-SOAs for all-optical latching were suggested. Although it has recently been established that CR-SOAs can support the execution of all-optical Boolean logic functions, this potential has not yet been investigated and proved when these functions are joined to construct more complicated all-optical circuits.

For the first time to our knowledge, Amer Kotb and his co-authors have simulated Set-Reset (SR) latch and D Flip-Flop at 120 Gb/s return-to-zero modulation data using CR-SOAs-based Mach-Zehnder interferometers. These latches were realized using all-optical NAND and NOT logic operations.

In the presence of amplified spontaneous emission noise, the quality factor influence on the important operating parameters was investigated and evaluated.

According to the findings, the CR-SOAs can implement the logical SR latch and D Flip-Flop at 120 Gb/s with logical correctness and high quality factor.