Abstract

We experimentally demonstrate an optics-based half-adder of two 4-phase-shift-keying (4-PSK) data channels using nonlinear wave mixing. The optics-based half-adder has two 4-ary phase-encoded inputs (i.e., S_A and S_B) and two phase-encoded outputs (i.e., Sum and Carry). The input quaternary base numbers {0,1,2,3} are represented by 4-PSK signals A and B with four phase levels. Along with the original signals A and B, the phase-conjugate signal copies A* and B*and phase-doubled signal copies A^2 and B^2 are also generated to form two signal groups S_A(A, A*, A^2) and S_B(B, B*, B^2). All of the above signals in the same signal group are (a) prepared in the electrical domain with a frequency spacing of Δf and (b) generated optically in the same IQ modulator. When combined with a pump laser, group S_A mixes with group S_B in a periodically poled lithium niobate nonlinear (PPLN) device. At the …

Date

June 22, 2023

Authors

Hao Song, Kaiheng Zou, Huibin Zhou, Narek Karapetyan, Amir Minoofar, Xinzhou Su, Ahmed Almaiman, Jonathan L Habif, Moshe Tur, Alan E Willner

Journal

Optics Letters

Volume

48

Issue

13

Pages

3475-3478

Publisher

Optica Publishing Group