Abstract

A new topology for a photonic notch filter that can solve the coherent interference problem in photonic signal processors is presented in this paper. It is based on a double-pass modulation technique. The key advantage of this new structure is that it completely removes the dominant phase noise limitation, which is a fundamental problem with existing incoherent processor approaches. It also enables arbitrary narrow-linewidth telecommunication-type lasers to be used with stable and robust filter operation. Extensions to obtain tunable notch frequency and wide-passband notch filter operation are presented. Results demonstrate robust notch filter operation with a narrow-linewidth source, no phase-induced intensity noise, and a vastly superior signal-to-noise ratio performance (i.e., a nearly 60-dB increase) compared with the conventional delay line notch filter. Tunable coherence-free operation of the notch filter is also shown. Finally, a new structure that not only operates without coherence limitations but also realizes a notch filter with a wide passband of more than 50% of the free spectral range is demonstrated.

© 2004 IEEE

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J. Lightwave Technol. (4)

B. Vizoso, C. Vazquez, R. Civera, M. Lopez-Amo and M. Muriel, "Amplified fiber-optic recirculating delay lines", J. Lightwave Technol., vol. 12, pp. 294-305, Feb. 1994 .

M. Tur and A. Arie, "Phase induced intensity noise in concatenated fiber-optic delay lines", J. Lightwave Technol., vol. 6, pp. 120-130, Jan. 1988.

T. Ido, S. Tanaka, M. Suzuki, M. Koizumi, H. Sano and H. Inoue, "Ultra-high-speed multiple-quantum-well electro-absorption optical modulators with integrated waveguides", J. Lightwave Technol., vol. 14, pp. 2026-2033, Sept. 1996.

G. Betts, L. Johnson and C. Cox, "High-sensitivity lumped-element bandpass modulators in LiNbO3", J. Lightwave Technol., vol. 7, pp. 2078-2083, Dec. 1989.

Other (11)

R. Ginadera, K. Hagedoen, A. Stohr and D. Jager, "Simultaneous transmission of 2.5 Gbit/s base band signal and microwave signals employing a 1.55 µm R-EAT for heterogeneous wireless/wireline networks", in Eur. Microwave Meeting Nefertiti, 2004, pp. 10-11.

W. Zhang, G. Yu and J. A. R. Williams, "Tap multiplexed fiber grating-based optical transversal filter", Electron. Lett., vol. 36, no. 20, pp. 1708-1710, 2000.

G. Yu, W. Zhang and J. A. R. Williams, "High-performance microwave transversal filter using fiber Bragg grating arrays", IEEE Photon. Technol. Lett., vol. 12, pp. 1183-1185, Sept. 2000.

E. H. W. Chan, K. E. Alameh and R. A. Minasian, "Photonic bandpass filters with high skirt selectivity and stopband attenuation", J. Lightwave Technol. , vol. 20, pp. 1962-1967, Nov. 2002.

B. Moslehi, "Analysis of optical phase noise in fiber-optic systems employing a laser source with arbitrary coherence time", J. Lightwave Technol., vol. LT-4, pp. 1334-1351, Sept. 1986.

W. Zhang, J. A. R. Williams and I. Bennion, "Optical fiber delay line filter free of limitation imposed by optical coherence", Electron. Lett., vol. 35, no. 24, pp. 2133-2134, 1999.

J. Chen, Y. Wu, J. Hodiak and P. Yu, "A novel digitally tunable microwave-photonic notch filter using differential group-delay module", IEEE Photon. Technol. Lett., vol. 15, pp. 284-286, Feb. 2003.

A. H. Quoc and S. Tedjini, "Experimental investigation on the optical unbalanced Mach-Zehnder interferometers as microwave filters", IEEE Microwave Guided Wave Lett., vol. 4, pp. 183-185, June 1994.

F. Coppinger, S. Yegnanarayanan, P. D. Trinh and B. Jalali, "Continuously tunable photonic radio-frequency notch filter", IEEE Photon. Technol. Lett., vol. 9, pp. 339-341, Mar. 1997.

B. A. L. Gwandu, W. Zhang, J. A. R. Williams, L. Zhang and I. Bennion, "Microwave photonic filtering using Gaussian-profiled superstructured fiber Bragg grating and dispersive fiber", Electron. Lett., vol. 38, no. 22, pp. 1328-1330, 2002 .

R. A. Minasian, K. E. Alameh and E. H. W. Chan, "Photonics-based interference mitigation filters", IEEE Trans. Microwave Theory Tech., vol. 49, pp. 1894-1899, Oct. 2001.

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