Abstract

The full adder (FA) and full subtractor (FS) are key operations used in the arithmetic and logic units of digital processors. Performing the FA and FS optically may enable the direct line-rate processing of high-speed optical data. Previous demonstrations of optical FA and FS have not been shown for phase-encoded input and output data signals. Such phase-encoded data formats could offer improved noise tolerances and longer distances of transmission compared to amplitude-encoded data formats. In this work, we experimentally demonstrate an optical FA and FS for binary-phase-shift-keying (BPSK) data signals at 2.5- and 5-Gbit/s. Our approach utilizes input BPSK data signals and continuous-wave pumps that are encoded at different frequencies, in which one of the input BPSK data signals is negated for the FS case. The data and pumps undergo nonlinear wave mixing in a periodically poled lithium niobate …

Date

2026

Authors

Abdulrahman Alhaddad, Wing Ko, Muralekrishnan Ramakrishnan, Amir Minoofar, Huibin Zhou, Zile Jiang, Hongkun Lian, Narek Karapetyan, Yingning Wang, Yue Zuo, Ruoyu Zeng, Ahmed Almaiman, Moshe Tur, Jonathan L Habif, Alan E Willner

Journal

Optics Letters

Volume

51

Issue

16

Pages

4553-4556

Publisher

Optica Publishing Group