Tailoring chirped Moire fiber Bragg gratings for wavelength-division-multiplexing and optical code-division multiple-access applications

The design and fabrication of chirped Moire fiber Bragg gratings (CMGs) are presented, which can be used in either (1) transmission as passband filter s for providing wavelength selectivity in wavelength-division-multiplexed ( WDM) systems or (2) reflection as encoding/decoding elements to decompose s hort broadband pulses in both wavelength and time in order to implement an optical code-division multiple-access (OCDMA) system. In transmission, the fabricated CMGs have single or multiple flattened passbands (<0.5 dB ripple ) and exhibit >12 dB isolation and near constant in-band group delay. It is shown that these filters do not produce any measurable dispersion-induced power penalties when used to provide wavelength selectivity in 2.5 Gbit/s s ystems. It is also demonstrated how CMGs can be used in reflection to encod e/decode short pulses from a wavelength-tunable mode-locked Er-doped fiber laser.