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Tunable super-structured fiber Bragg gratings with perfect sequences

Pereira, J. ; Ferreira, M. P. M. F. ; Gasparovic, M.G.

OAHOST - Open Access Journal Vol. 1, Nº 1, pp. 1 - 15, October, 2016.

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Recently, tunable fiber Bragg grating (FBG) was developed by using stress-responsive colloidal crystals [1]. In this paper, we have simulated the application of these nanoparticles into super-structured fiber Bragg grating (SSFGB) written with perfect sequences derived from a short Maximal-Length sequence [2]. A tunable SSFBG will be available to overcome the prohibitive temperature variation of these optical codecs [3]. Nevertheless, we present a method to implement a coherent time spreading optical code-division multiple-access (OCDMA) where a unique code (or perfect sequence) can be reused and mixed with different wavelengths to obtain a tunable wavelength-division multiplexing (WDM) system. In order to maximize the binary throughput, we have selected a unique short Maximal-Length sequence composed of 7 chips that can be tuned with 7 different optical wavelengths. We found thousands of different tunable combinations that present power contrast ratios (P/C) higher than 12 dB. When a WDM-OCDMA system uses 2 different combinations simultaneously, a perfect binary detection with error correction codes is achieved successfully. The tunable SSFBG with colloidal crystals will be a simple and good alternative choice for Fiber-to-the-Home (FTTH) communications.