All-optical Walsh-Hadamard code Generation using MZI

Code division multiple access (CDMA) or multicarrier CDMA (MC-CDMA), Walsh-Hadamard codes are extensively used for its attribute of orthogonality and hence it leads to good cross-correlation property. In the last time, in CDMA communications, spread spectrum codes is Walsh-Hadamard codes and it is generated simply. Walsh-Hadamard codes are completely orthogonal binary user codes, that arehaving a lot of favorable applications in communications based on synchronous multicarrier. However, the optical applications of Walsh-Hadamard codes are also important for optical CDMA. To achieve this goal, all-optical Walsh-Hadamard codes generation using Mach-Zehnder interferometer (MZI) is explored in this paper.