Abstract

We propose a novel approach to realizing all-optical microwave filtering using an array of fiber Bragg gratings with identical reflectivities. The filter tapping coefficients are determined by the spectrum profile of a broadband light source and the central wavelengths of the gratings. Since the fiber Bragg gratings have identical reflectivities, the characteristics of the gratings with high uniformity are possible, which simplifies the fiber Bragg grating fabrication and reduces the implementation error. In addition,the spectrum profile of the broadband light source can be controlled using an optical filter, which could be used to control the filter coefficients to suppress the filter sidelobes. A microwave filter using four fiber Bragg gratings is experimentally implemented.

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  1. K. P. Jackson, S. A. Newton, B. Moslehi, M. Tur, C. C. Cutler, J. W. Goodman and H. J. Shaw, "Optical fiber delay line signal processing", IEEE Trans. Microw. Theory Tech., vol. MTT-33, pp. 193-209, Mar. 1985.
  2. K. Wilner and A. P. Van den Heuvel, "Fiber-optic delay lines for microwave signal processing", in Proc. IEEE, vol. 64, 1976, pp. 805-807.
  3. S. Sales, J. Capmany, J. Martin and D. Pastor, "Experimental demonstration of fiber-optic delay filters with negative coefficients", Electron. Lett., vol. 31, no. 13, pp. 1095-1096, June 1995.
  4. 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. Microw. Theory Tech., vol. 45, pp. 1458-1462, Aug. 1997.
  5. D. Norton, S. Johns, C. Keefer and R. Soref, "Tunable microwave filtering using high dispersion fiber time delays", IEEE Photon. Technol. Lett., vol. 6, pp. 831-832, Jul. 1994.
  6. V. Polo, B. Vidal, J. L. Corral and J. Marti, "Novel tunable photonics microwave filter based on laser arrays and N x N AWG-based delay lines", IEEE Photon. Technol. Lett., vol. 15, pp. 584 -586, Apr. 2003.
  7. D. B. Hunter and R. Minasian, "Reflectivity tapped fiber optic transversal filter using in-fiber Bragg gratings", Electron. Lett., vol. 31, pp. 1010-1012, Jun. 1995.
  8. J. Marti, F. Ramos and R. I. Laming, "Photonic microwave filter employing multimode optical sources and wideband chirped fiber gratings", Electron. Lett., vol. 34, no. 18, pp. 1760-1761, Sep. 1998.
  9. 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, Sep. 2000.
  10. J. Capmany, D. Pastor and B. Ortega, "Efficient sidelobe suppression by source power apodization in fiber optic microwave filters composed of linearly chirped fiber grating by laser array", Electron. Lett., vol. 35, no. 8, pp. 640-642, Apr. 1999.
  11. D. B. Hunter and R. A. Minasian, "Microwave optical filters using in-fiber Bragg grating arrays", IEEE Microw. Guided Wave Lett., vol. 6, pp. 103-105, Feb. 1996.
  12. D. Pastor, J. Capmany and B. Ortega, "Broad-band tunable microwave transversal notch filter based on tunable uniform fiber Bragg gratings as slicing filters", IEEE Photon. Technol. Lett., vol. 13, pp. 726-728, Jul. 2001.
  13. F. Zeng, J. P. Yao and S. Mihailov, "Genetic algorithm for fiber Bragg grating based all-optical microwave filter synthesis", Opt. Eng., vol. 42, no. 8, pp. 2250-2256, Aug. 2003.
  14. T. Erdogan, "Fiber grating spectra", J. Lightw. Technol. , vol. 15, pp. 1277-1294, Aug. 1997.
  15. X. Fang and R. O. Claus, "Polarization-independent all-fiber wavelength-division multiplexer based on a Sagnac interferometer", Opt. Lett., vol. 20, no. 20, pp. 2146-2148, Oct. 1995.
  16. X. Fang, H. Ji, C. T. Allen, K. Demarest and L. Pelz, "A compound high-order polarization-independent Birefringence filter using Sagnac interferometers", IEEE Photon. Technol. Lett., vol. 9, pp. 458-460, Apr. 1997.

Other (16)

K. P. Jackson, S. A. Newton, B. Moslehi, M. Tur, C. C. Cutler, J. W. Goodman and H. J. Shaw, "Optical fiber delay line signal processing", IEEE Trans. Microw. Theory Tech., vol. MTT-33, pp. 193-209, Mar. 1985.

K. Wilner and A. P. Van den Heuvel, "Fiber-optic delay lines for microwave signal processing", in Proc. IEEE, vol. 64, 1976, pp. 805-807.

S. Sales, J. Capmany, J. Martin and D. Pastor, "Experimental demonstration of fiber-optic delay filters with negative coefficients", Electron. Lett., vol. 31, no. 13, pp. 1095-1096, June 1995.

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. Microw. Theory Tech., vol. 45, pp. 1458-1462, Aug. 1997.

D. Norton, S. Johns, C. Keefer and R. Soref, "Tunable microwave filtering using high dispersion fiber time delays", IEEE Photon. Technol. Lett., vol. 6, pp. 831-832, Jul. 1994.

V. Polo, B. Vidal, J. L. Corral and J. Marti, "Novel tunable photonics microwave filter based on laser arrays and N x N AWG-based delay lines", IEEE Photon. Technol. Lett., vol. 15, pp. 584 -586, Apr. 2003.

D. B. Hunter and R. Minasian, "Reflectivity tapped fiber optic transversal filter using in-fiber Bragg gratings", Electron. Lett., vol. 31, pp. 1010-1012, Jun. 1995.

J. Marti, F. Ramos and R. I. Laming, "Photonic microwave filter employing multimode optical sources and wideband chirped fiber gratings", Electron. Lett., vol. 34, no. 18, pp. 1760-1761, Sep. 1998.

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, Sep. 2000.

J. Capmany, D. Pastor and B. Ortega, "Efficient sidelobe suppression by source power apodization in fiber optic microwave filters composed of linearly chirped fiber grating by laser array", Electron. Lett., vol. 35, no. 8, pp. 640-642, Apr. 1999.

D. B. Hunter and R. A. Minasian, "Microwave optical filters using in-fiber Bragg grating arrays", IEEE Microw. Guided Wave Lett., vol. 6, pp. 103-105, Feb. 1996.

D. Pastor, J. Capmany and B. Ortega, "Broad-band tunable microwave transversal notch filter based on tunable uniform fiber Bragg gratings as slicing filters", IEEE Photon. Technol. Lett., vol. 13, pp. 726-728, Jul. 2001.

F. Zeng, J. P. Yao and S. Mihailov, "Genetic algorithm for fiber Bragg grating based all-optical microwave filter synthesis", Opt. Eng., vol. 42, no. 8, pp. 2250-2256, Aug. 2003.

T. Erdogan, "Fiber grating spectra", J. Lightw. Technol. , vol. 15, pp. 1277-1294, Aug. 1997.

X. Fang and R. O. Claus, "Polarization-independent all-fiber wavelength-division multiplexer based on a Sagnac interferometer", Opt. Lett., vol. 20, no. 20, pp. 2146-2148, Oct. 1995.

X. Fang, H. Ji, C. T. Allen, K. Demarest and L. Pelz, "A compound high-order polarization-independent Birefringence filter using Sagnac interferometers", IEEE Photon. Technol. Lett., vol. 9, pp. 458-460, Apr. 1997.

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