1、ARRAYED WAVEGUIDE GRATINGS,-By Shodhan ShettyECE-E641,Operation Principle,Free Propagation Regions (FPRs),Arrayed Waveguides,AWG is a complex optical circuit contained on a glass-silicon wafer about 1 or 2 inches in diameter,Operation Principle (contd ),Application of Fresnel-Kirchoff diffraction in
2、tegral to one of the FPRs in an AWG,W,R,A( ),Operation Principle (contd),Fresnel-Kirchoff diffraction integralFree Spectral Range,=Optical path length difference between adjacent array arms,Here,Functions,WDM de(multiplexing) 1 OADM 2 Wavelength Routing Signal Processing Dispersion Compensation 3 Op
3、tical True-time delay lines 4 Optical Filters 5 Femto-second pulse train generation 6Specifications required: Channel Spacing Pass band Shape Adjacent Channel Crosstalk Free Spectral Range,WDM de(multiplexing) and OADM,Optical Filter 7,Optical Filter (contd ),Optical Delay Line 4,Here, d is distance
4、 between Antenna Array elements,AWG Chip,Bare AWG chip,A packaged Arrayed waveguide Grating optical mux/demux module,References,1 H. Yamada et al, “Measurement of Phase and Amplitude Error Distributionsin Arrayed-Waveguide Grating Multi/Demultiplexers Based on Dispersive Waveguide“, Journal of Light
5、wave 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 p
6、hotonic 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
7、,” 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,
