High-performance optical code generation and recognition by use of a 511-chip, 640-Gchip/s phase-shifted superstructured fiber Bragg grating

The generation and recognition of a record-length 511-chip optical code is experimentally demonstrated by use of a superstructured fiber Bragg grating (SSFBG) with a chip rate of $640 \mathrm{Gchips}/\mathrm{s}$. Very high reflectivity (92%) is achieved with high-quality correlation properties. The temperature deviation tolerance is approximately $\pm 0.3 {}^{°}\mathrm{C}$, which is within the package’s temperature stability range $\left(\pm 0.1 {}^{°}\mathrm{C}\right)$. Experimental results show good agreement with the theory. They indicate the SSFBG’s potential for processing a long optical code with an ultrahigh chip rate, which could significantly improve the system’s performance.