Abstract

A new topology for a photonic signal processor, which overcomes the basic recursive frequency response problem that limits the passband range,is presented. The structure is based on a new multiple-wavelength offset-cavity structure that is cascaded with a series of unbalanced delay line structures. This not only can synthesize a very narrow notch response with good shape factor but also permits a multifold extension of the free spectral range (FSR) and passband width. Results on the interference mitigation filter demonstrate a stopband of 1% of center frequency and a fourfold increase in the FSR and passband width, while also having a very small shape factor, in excellent agreement with predictions.

© 2003 IEEE

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J. Lightwave Technol. (1)

J. Kringlebotn and K. Bloktecjar, "Noise analysis of an amplified fiber-optic recirculating-ring delay line", J. Lightwave Technol., vol. 12, pp. 573-582, Mar. 1994.

Other (11)

D. B. Hunter and R. A. Minasian, "Reflectively tapped fiber optic transversal filter using in-fiber Bragg gratings", Electron. Lett., vol. 31, no. 12, pp. 1010-1012, 1995.

J. Capmany, D. Pastor and B. Ortega, "New and flexible fiber-optic delay-line filters using chirped Bragg gratings and laser arrays", IEEE Trans. Microwave Theory Tech., vol. 47, pp. 1321-1326, July 1999.

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.

W. Zhang, J. A. R. Williams, L. A. Everall and I. Bennion, "Fiber optic radio frequency notch filter with linear and continuous tuning by using a chirped fiber grating", Electron. Lett., vol. 34, no. 18, pp. 1770-1772, 1998 .

S. Li, K. S. Chiang, W. A. Gambling, Y. Liu, L. Zhang and I. Bennion, "A novel tunable all-optical incoherent negative-tap fiber-optic transversal filter based on a DFB laser diode and fiber Bragg gratings", IEEE Photon. Technol. Lett., vol. 12, pp. 1207 -1209, Sept. 2000.

J. Marti, V. Polo, F. Ramos and D. Moodie, "Photonic tunable microwave filters employing electroabsorption modulators and wideband chirped fiber gratings", Electron. Lett., vol. 35, no. 4, pp. 305-306, 1999.

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.

T. A. Cusick, S. Iezekiel, R. E. Miles, S. Sales and J. Capmany, "Synthesis of all-optical microwave filters using Mach-Zehnder lattices", IEEE Trans. Microwave Theory Tech., vol. 45, pp. 1458-1462, Aug. 1997.

J. X. Chen, Y. Wu, J. Hodiak and P. K. L. 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.

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

N. You and R. A. Minasian, "A novel high-Q optical microwave processor using hybrid delay-line filters", IEEE Trans. Microwave Theory Tech., vol. 47, pp. 1304-1308, July 1999.

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