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FBG-based optical interface to support a multisector antenna in a spectrally efficient fiber radio system

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10 Author(s)
Marra, C. ; Dept. of Electr. & Electron. Eng., Univ. of Melbourne, Vic., Australia ; Nirmalathas, A. ; Lim, C. ; Attygalle, M.
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We propose and demonstrate a fiber Bragg grating (FBG)-based optical interface for use in a spectrally efficient fiber-radio network with multisector antennas. The system has the novel feature of being specifically developed for use in existing wavelength-division-multiplexed network infrastructures. The proposed scheme supports transport of a remote local oscillator (LO) and three subcarrier multiplexed data channels, destined for different antenna sectors, using a single wavelength. The composite signal was contained within a 25-GHz band, selected via a 25-GHz dispersion-flattened FBG. Recovery of the LO and data channels is performed via optical filtering, using either a novel single grating incorporating multiple phase shifts or multiple narrow bandwidth gratings. Our measurements show that all channels within the 25-GHz band are successfully recovered with less than 2-dB optical power penalty between channels. The use of the 25-GHz grating exhibits an improvement in sensitivity of 3 dB for all data channels.

Published in:

Photonics Technology Letters, IEEE  (Volume:16 ,  Issue: 1 )

Date of Publication:

Jan. 2004

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