Novel Encoder/Decoder Using Subsampled Bragg Grating for a WDM-Compatible OCDMA System |
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Authors: | Tao Pu Yingxun Zhu Peng Chen Xiangfei Chen Lin Lu Rong Wang Yuquan Li Jilin Zheng |
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Affiliation: | Inst. of Commun. Eng., Nanjing; |
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Abstract: | Optical code-division multiple-access (OCDMA) technology is attractive for optical broadband access network. It is very interesting to use the super-structure fiber-Bragg-grating-based en/decoders to construct a wavelength-division-multiplexing (WDM)-compatible OCDMA system. Based on the equivalent phase-shift technique, we have proposed a subsampled-Bragg-grating (S-SBG)-based en/decoder. Based on the proposed method, only a single uniform phase mask can be used to accommodate different WDM channels with relevant central wavelengths and spectrum width. Using the S-SBG-based en/decoder, we can make different WDM channels have similar as well as better encoding efficiency and correlation performance. S-SBG-based en/decoders with 127 chips for two different wavelength channels are fabricated and measured. The experiments indicate the advantages revealed by the theoretical simulation. |
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