Experimental demonstration of an optics-based 4-PSK half-adder using nonlinear wave mixing
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 A2 and B2 are also generated to form two signal groups S A (A, A*, A2) and S B (B, B*, B2). 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 output of the PPLN device, both the Sum (A2B2) and the Carry (AB + A*B*) are simultaneously generated with four phase levels and two phase levels, respectively. In our experiment, the symbol rates can be varied between 5 Gbaud and 10 Gbaud. The experimental results show that (i) the measured conversion efficiency of two 5-Gbaud outputs is approximately −24 dB for Sum and approximately −20 dB for Carry, and (ii) the measured optical signal-to-noise ratio (OSNR) penalty of the 10-Gbaud Sum and Carry channels is −3.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jun 22, 2023
- Source ID
- 10.1364/ol.492346
Entities
People
- Ahmed Almaiman
- Alan E. Willner
- Amir Minoofar
- Hao Song
- Huibin Zhou
- Jonathan L. Habif
- Kaiheng Zou
- Moshe Tur
- Narek Karapetyan
- Xinzhou Su
Organizations
- Defense Advanced Research Projects Agency
- King Saud University
- Tel Aviv University
- University of Southern California