Abstract

The effect of phase noises from a laser and an oscillator on radio-over-fiber (RoF) systems is analyzed and discussed with a power spectral density (PSD) function. A Mach-Zehnder modulator (MZM) and a phase shifter are employed to externally generate an optical single sideband (OSSB) signal since the OSSB signal is tolerable for power degradation due to a chromatic fiber-dispersion effect. It is shown that a carrier-to-noise ratio (CNR) penalty is deeply related to the bandwidth of a receiver filter and the phase noise from a radio frequency (RF) signal oscillator rather than that from a laser in a small differential-delay environment and a direct detection scheme. The CNR penalty due to the increment of the laser linewidth from 10 to 624 MHz is almost 1.1 dB, while the increase of the RF-oscillator linewidth from 1 to 100 Hz results in about a 20-dB penalty at a 30-GHz 10-km transmission in a standard single-mode fiber (SSMF) with a fiber chromatic dispersion of 17 ps/km ...nm.

© 2005 IEEE

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Other (21)

J. J. O'Reilly, P. M. Lane, M. H. Capstick, H. M. Salgado, R. Heidemann, R. Hofstetter and H. Schmuck, "RACE R2005: Microwave optical duplex antenna link", Proc. Inst. Elect. Eng., vol. 140, no. 6, pp. 385-391, Dec. 1993.

G. H. Smith and D. Novak, "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.

J. Leibrich, "CF-RZ-DPSK for suppression of XPM on dispersion-managed long-haul optical WDM transmission on standard single-mode fiber", IEEE Photon. Technol. Lett., vol. 14, no. 2, pp. 155-157, Feb. 2002.

Y. J. Wen, "Power level optimization of 40 Gb/s DWDM systems with hybrid Raman/EDFA amplification", in Proc. Conf. Optical Internet/Australian Conf. Optical Fibre Technology (COIN/ACOFT), Melbourne, Australia,Jul. 2003, pp. 309-312.

K.-I. Kitayama, "Ultimate performance of optical DSB signal-based millimeter-wave fiber-radio system: Effect of laser phase noise", J. Lightw. Technol., vol. 17, no. 10, pp. 1774-1781, Oct. 1999.

J. R. Barry and E. A. Lee, "Performance of coherent optical receivers", Proc. Inst. Elect. Eng., vol. 78, no. 8, pp. 1369-1394, Aug. 1990.

J. Salz, "Modulation and detection for coherent lightwave communications", IEEE Commun. Mag., vol. COMM-24, no. 6, pp. 38-49, Jun. 1986.

P. B. Gallion and G. Debarge, "Quantum phase noise and field correlation in single frequency semiconductor laser systems", IEEE J. Quantum Electron., vol. QE-6, no. 4, pp. 343-349, Apr. 1984.

R. W. Tkach, "Phase noise and linewidth in an InGaAsP DFB laser", J. Lightw. Technol., vol. LT-4, no. 11, pp. 1711-1716, Nov. 1986.

U. Gliese, "Chromatic dispersion in fiber-optic microwave and millimeter-wave links", IEEE Trans. Microw. Theory Tech., vol. 44, no. 10, pp. 1716-1724, Oct. 1996.

T.-S. Cho, "Modified BER estimation of optical link considering the nonlinear effect of the fiber", Korean Inst. Commun. Sci. (KICS), vol. 23, no. 2, pp. 1707-1710, Aug. 2001.

M. Iqbal, J.-I. Song and K. Kim, "Performance of millimeter wave transmission systems with digital subcarrier modulations for radio over fiber links", in Proc. Microwave Photonics (MWP), Oxford, U.K., 2000, pp. 43-47.

M. Iqbal and K. Kim, "Performance of QAM systems with respect to phase noise spectral shape", in Proc. Canadian Conference on Electrical and Computer Engineering (CCECE) 2000, Halifax, NS, Canada, 2000, pp. 14-16.

M. Iqbal, J. Lee and K. Kim, "Performance comparison of digital modulation schemes with respect to phase noise spectral shape", in Proc. Electrical and Computer Engineering, Canadian Conf., vol. 2, Halifax, NS, Canada,Mar. 2000, pp. 856-860.

C. Lim, A. Nirmalathas, D. Novak, R. S. Tucker and R. B. Waterhouse, "Technique for increasing optical spectral efficiency in millimetre-wave WDM fibre-radio", Electron. Lett., vol. 37, no. 16, pp. 1043-1045, Aug. 2001.

D. Ham and A. Hajimiri, "Virtual damping and Einstein relation in oscillators", IEEE J. Solid-State Circuits, vol. 38, no. 3, pp. 407-418, Mar. 2003.

B. Sklar, Digital Communications, Englewood Cliffs, NJ: Prentice-Hall, 1988, pp. 43-44.

H. J. R. Dutton, Understanding Optical Communications, Research Triangle Park, NC: IBM Corp., 1998, p. 111.

H. Al-Raweshidy, Radio Over Fiber Technologies for Mobile Communications Networks, Boston, MA: Artech House, 2002.

R. Prasad, Universal Wireless Personal Communications, Boston, MA: Artech House, 1998, p. 139.

G. P. Agrawal, Fiber-Optic Communication Systems, New York: Wiley, 1997.

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