Zhang, Z., Tian, C., Mokhtar, M.R., Petropoulos, P., Richardson, D.J. and Ibsen, M.
Rapidly reconfigurable optical phase encoder-decoders based on fiber Bragg gratings
IEEE Photonics Technology Letters, 18, (11), . (doi:10.1109/LPT.2006.875062).
We demonstrate the capacity for fast dynamic reconfiguration of optical code-division multiple access (OCDMA) phase en/decoders based on fiber Bragg gratings and a thermal phase-tuning technique. The tuning time between two different phase codes is measured to be less than 2 s. An OCDMA system using tunable-phase decoders is compared with a system using fixed-phase decoders and, although the system using fixed-phase decoders exhibits a shorter output autocorrelation pulsewidth and lower sidelobes, the system using tunable-phase decoders has advantages of flexibility and a more relaxed requirement on the input pulsewidth.
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