Abstract
An optical-code-division-multiple-access (OCDMA) system with a novel modulation
scheme for simultaneous generation of time-domain spectral phase encoding/decoding
(SPE/SPD) and differential phase-shift keying (DPSK) data modulation that can be
potentially rapidly reconfigured using only a single-phase modulator (PM) is proposed
and experimentally demonstrated. The time-domain SPE is realized by stretching and
compressing the ultrashort optical pulse through two-chirped fiber Bragg gratings with
opposite dispersion and a high-speed PM for optical code (OC) generation and data
modulation. The SPD has similar configuration as the SPE counterpart but using another
PM synchronously driven by the complementary code pattern for OC recognition. Simulation
investigation and experimental results both show that the code transition, dispersion
mismatch between the encoding and decoding side, and the transmission fiber dispersion
have detrimental effect on the en/decoding performance. In the experiment, 16-chip,
40-Gchip/s OC pattern and 2.5-Gb/s DPSK data modulation have been simultaneously
generated using a single PM. The 2.5-Gb/s DPSK data have been successfully decoded and
transmitted over 34 km fiber with BER < 10<sup>-9</sup> for five OCs. The
proposed scheme employs similar setup for transmitter and receiver, exhibiting the
potential to simplify the architecture of the whole system, and improve the flexibility
and confidentiality of OCDMA system.
© 2010 IEEE
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