Abstract

The authors propose a method to optimize the RF gain in narrowband radio-over-fiber links employing a Mach–Zehnder modulator followed by an erbium-doped fiber amplifier (EDFA) for amplification. Optimization is achieved by control of the modulator bias in order to improve the signal optical-modulation depth (OMD). Thus, for a given modulation amplitude, the optical signal has a reduced mean optical power and can access the small signal gain of the EDFA. This unsaturated gain is higher than the saturated one, thereby significantly increasing the RF gain of the link. Simultaneous optimization of OMD is also desirable to reduce detector saturation and fiber-induced nonlinear effects. They derive an analytical expression to describe optimum operating conditions for the modulator bias and validate their results through numerical simulation and experimental work. The proposed optimum modulator operating point is experimentally proven to be applicable to multicarrier signals like those used in 802.11a/g protocols.

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Appl. Opt. (1)

Electron. Lett. (1)

D. Tanguy, P. Jaffre, E. Penard, "Analysis of drive conditions of Mach–Zehnder modulator for 16-QAM transmission," Electron. Lett. 34, 1119-1121 (1998).

IEEE Commun. Lett. (1)

N. Horvath, I. Frigyes, "Effects of the nonlinearity of a Mach–Zehnder modulator on OFDM radio-over-fiber transmission," IEEE Commun. Lett. 9, 921-923 (2005).

IEEE J. Quantum Electron. (1)

B. H. Kolner, D. M. Bloom, "Electrooptic sampling in GaAs integrated circuits," IEEE J. Quantum Electron. QE-22, 79-93 (1986).

IEEE Photon. Technol. Lett. (5)

M. L. Farwell, W. S. C. Chang, D. R. Huber, "Increased linear dynamic range by low biasing the Mach–Zehnder modulator," IEEE Photon. Technol. Lett. 5, 779-782 (1993).

M. M. Howerton, R. P. Moeller, G. K. Gopalakrishnan, W. K. Burns, "Low-biased fiber-optic link for microwave downconversion," IEEE Photon. Technol. Lett. 8, 1692-1694 (1996).

X. Zhang, A. Mitchell, "A simple black box model for erbium-doped fiber amplifiers," IEEE Photon. Technol. Lett. 12, 28-30 (2000).

M. M. Sisto, S. Larochelle, L. A. Rush, "Carrier-to-noise ratio optimization by modulator bias control in radio over fibre links," IEEE Photon. Technol. Lett. 18, 1840-1842 (2006).

R. D. Esman, K. J. Williams, "Measurement of harmonic distortion in microwave photodetectors," IEEE Photon. Technol. Lett. 2, 502-504 (1990).

IEEE Trans. Microw. Theory Tech. (3)

E. Ackerman, S. Wanuga, D. Kasemset, A. S. Daryoush, N. R. Samant, "Maximum dynamic range operation of a microwave external modulation fiber-optic link," IEEE Trans. Microw. Theory Tech. 41, 1299-1306 (1993).

D. J. M. Sabido, L. G. Kazovsky, "Dynamic range of optically amplified RF optical links," IEEE Trans. Microw. Theory Tech. 49, 1950-1955 (2001).

L. T. Nichols, K. J. Williams, R. D. Esman, "Optimizing the ultrawide-band photonic link," IEEE Trans. Microw. Theory Tech. 45, 1384-1389 (1997).

J. Lightw. Technol. (1)

C. H. Bulmer, W. K. Burns, "Linear interferometric modulators in Ti: $\hbox{LiNbO}_{3}$," J. Lightw. Technol. LT-2, 512-521 (1984).

Other (6)

IEEEIEEE Std 802.11a-1999 [ISO/IEC 8802-11:1999/Amd 1:2000(E)] (Supplement to IEEE Std 802.11, 1999 Edition) Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications: High-Speed Physical Layer in the 5 GHz Band (1999).

M. M. Howerton, G. K. Gopalakrishnan, R. P. Moeller, W. K. Burns, "Low-biasing the cascaded downconverting fiber-optic link," Proc. OFC (1996) pp. 211-213.

G. E. Betts, L. M. Johnson, C. H. Cox, III"Optimization of externally modulated analog optical links," Proc. SPIE-Int. Soc. Opt. Eng.—Devices for Optical Processing (1991) pp. 281-302.

I. Paslaski, P. C. Chen, I. S. Chen, N. Bar-Chaim, "High-power microwave photodiode for high-dynamic-range analog transmission," Conf. Optical Fiber Commun. (OFC) San JoseCA (1994) Paper ThG5.

M. R. Phillips, "Amplified 1550-nm CATV lightwave systems," Optical Fiber Commun. (OFC) Conf. Exh. Tech. Dig. (1998) pp. 85-86.

M. L. VanBlaricum, "Photonic systems for antenna applications," IEEE Aerospace Applications Conf. VailCO (1994).

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