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ARRAYED WAVEGUIDE GRATINGS

ARRAYED WAVEGUIDE GRATINGS . -By Shodhan Shetty ECE-E641. Operation Principle. AWG is a complex optical circuit contained on a glass-silicon wafer about 1 or 2 inches in diameter. Arrayed Waveguides. Free Propagation Regions (FPRs). Operation Principle (contd ..).

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ARRAYED WAVEGUIDE GRATINGS

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  1. ARRAYED WAVEGUIDE GRATINGS -By Shodhan Shetty ECE-E641

  2. Operation Principle AWG is a complex optical circuit contained on a glass-silicon wafer about 1 or 2 inches in diameter Arrayed Waveguides Free Propagation Regions (FPRs)

  3. Operation Principle (contd ..) Application of Fresnel-Kirchoff diffraction integral to one of the FPRs in an AWG R W A( )

  4. Operation Principle (contd..) • Fresnel-Kirchoff diffraction integral • Free Spectral Range Here, =Optical path length difference between adjacent array arms

  5. Functions • WDM de(multiplexing) [1] • OADM [2] • Wavelength Routing • Signal Processing • Dispersion Compensation [3] • Optical True-time delay lines [4] • Optical Filters [5] • Femto-second pulse train generation [6] • Specifications required: • Channel Spacing • Pass band Shape • Adjacent Channel Crosstalk • Free Spectral Range

  6. WDM de(multiplexing) and OADM

  7. Optical Filter [7]

  8. Optical Filter (contd.. )

  9. Optical Delay Line [4] Here, d is distance between Antenna Array elements

  10. AWG Chip A packaged Arrayed waveguide Grating optical mux/demux module Bare AWG chip

  11. References [1] H. Yamada et al, "Measurement of Phase and Amplitude Error Distributions in Arrayed-Waveguide Grating Multi/Demultiplexers Based on Dispersive Waveguide", Journal of Lightwave Technol., p.1309 (2000) [2] Y. Tachikawa, Y. Inoue, M.Kawachi, H. Takahashi, and K. Inoue,”Arrayed-waveguide grating add-drop multiplexer with loop-back optical paths,” Electron. Lett., 1993,29,pp. 2133-2134 [3] Michael Parker, Stuart walker,” Arrayed waveguide gratings, fiber Bragg gratings, and photonic crystals: An Isomorphic Fourier transform light propagation analysis,” IEEE journal of selected topics in quantum electronics, vol. 8, pp. 1158, 2002 [4] B. Vidal et al, “Novel Dispersion-based optical delay line using Arrayed waveguide grating for antenna beamforming applications [5] K. Okamoto,” Recent progress of integrated optics planar lightwave circuits,” Optical quantum Electron., vol. 31, pp. 107-129,1999 [6] D.E. Leird, A.M. Weiner et al, “Generation of high repetition rate WDM pulse trains from an Arrayed waveguide grating,” IEEE PTL, vol. 13, pp. 221, 2001 [7] Van Thourhaut et al,”Novel Geometry for an Integrated channel Selector,” IEEE Jour. of sel. Topics in Quantum Electronics

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