Abstract

In radio over fiber (RoF) systems, two subcarrier modulations (SCMs), i.e., single-sideband (SSB) and tandem single-sideband (TSSB), have been widely used. Both SSB and TSSB SCMs can be obtained using optical Mach-Zehnder modulators. In this paper, the authors theoretically investigate the impact of harmonic distortion and intermodulation distortion in RoF systems for one wavelength carrying two radio frequency (RF) signals with either SSB or TSSB SCM. It is found that nonlinear distortion can be reduced when the frequency difference of two RF signals is ~ 1 GHz compared with ~ 2 GHz and higher for both TSSB and SSB SCMs, particularly for large modulation indexes. When the frequency difference of RF signals is ~ 2 GHz and beyond, either a small modulation index or a medium modulation index combined with a minimum RF of 6 GHz must be used, and a large modulation index cannot be used due to serious nonlinear distortion. Comparison of SSB and TSSB SCMs with uniform distribution of optical signal subcarriers in a dense wavelength-division-multiplexing RoF system with channel spacing of 12.5 GHz shows by simulation that SSB SCM is better (worse) than TSSB SCM for small (large) modulation indexes.

© 2006 IEEE

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  13. L. Roselli, V. Borgioni, F. Zepparelli, F. Ambrosi, M. Comez, P. Faccin and A. Casini, "Analog laser pre-distortion for multi-service radio over fiber systems", J. Lightw. Technol., vol. 21, no. 5, pp. 1211-1223, May 2003.

Other (13)

J. Yu, J. Gu, X. Liu, Z. Jia and G. Chang, "Seamless integration of an 8 × 2.5 Gb/s WDM PON and radio over fiber using all-optical up-conversion based on Raman assisted FWM", IEEE Photon. Technol. Lett., vol. 17, no. 9, pp. 1986-1988, Sep. 2005.

X. Zhang, B. Liu, J. Yao, K. Wu and R. Kashyap, "A novel millimeter-wave band radio over fiber system with dense wavelength division multiplexing bus architecture", IEEE Trans. Microw. Theory Tech., vol. 54, no. 2, pp. 929-937, Feb. 2006.

W. Chen and W. Way, "Multi-channel signal-sideband SCM/DWDM transmission systems", J. Lightw. Technol., vol. 22, no. 7, pp. 1679-1693, Jul. 2004.

M. Bakaul, A. Nirmalathas and C. Lim, "Multi-functional WDM optical interface for millimeter wave fiber-radio Antenna base station", J. Lightw. Technol., vol. 23, no. 3, pp. 1210-1218, Mar. 2005.

C. Lim, A. Nirmalathas, M. Attygalle, D. Novek and R. Waterhouse, "On the merging of millimeter-wave fiber-radio backbone with 25 GHz WDM ring networks", J. Lightw. Technol., vol. 21, no. 10, pp. 2203-2210, Oct. 2003.

H. Toda, T. Yamashita, T. Kuri and K. Kitayama, "Demultiplexing using an arrayed-waveguide grating for frequency interleaved DWDM millimeter-wave radio on fiber systems", J. Lightw. Technol., vol. 21, no. 8, pp. 1735-1741, Aug. 2003.

T. Kuri and K. Kitayama, "Optical heterodyne detection techniques for densely multiplexed millimeter-wave band radio on fiber systems", J. Lightw. Technol., vol. 21, no. 12, pp. 3167-3179, Dec. 2003.

G. Smith, D. Novak and Z. Ahmed, "Technique for optical SSB generation to overcome dispersion penalties in fiber-radio system", Electron. Lett., vol. 33, no. 1, pp. 74-75, Jan. 1997.

G. Smith, D. Novak and Z. Ahmed, "Overcoming chromatic dispersion effects in fiber-wireless systems incorporating external modulators", IEEE Trans. Microw. Theory Tech., vol. 45, no. 8, pp. 1410-1415, Aug. 1997.

A. Narasimha, X. Meng, M. Wu and E. Yablonovitch, "Tandem single-side band modulation scheme for doubling spectral efficiency of analogue fiber links", Electron. Lett., vol. 36, no. 13, pp. 1135-1136, Jun. 2000.

P. Laurencio and M. Medeiros, "Dynamic range of optical links employing optical single side-band modulation", IEEE Photon. Technol. Lett., vol. 15, no. 5, pp. 748-750, May 2003.

H. Lu, S. Tzeng and Y. Liu, "Intermodulation distortion suppression in a full-duplex radio over fiber ring networks", IEEE Photonics Technol. Lett., vol. 16, pp. 602-604, Feb. 2004.

L. Roselli, V. Borgioni, F. Zepparelli, F. Ambrosi, M. Comez, P. Faccin and A. Casini, "Analog laser pre-distortion for multi-service radio over fiber systems", J. Lightw. Technol., vol. 21, no. 5, pp. 1211-1223, May 2003.

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