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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

ARRAYED WAVEGUIDE GRATINGS

-By Shodhan Shetty

ECE-E641

operation principle
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
Operation Principle (contd ..)

Application of Fresnel-Kirchoff diffraction integral to one of the FPRs in an AWG

R

W

A( )

operation principle contd4
Operation Principle (contd..)
  • Fresnel-Kirchoff diffraction integral
  • Free Spectral Range

Here,

=Optical path length difference between adjacent array arms

functions
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
optical delay line 4
Optical Delay Line [4]

Here, d is distance between

Antenna Array elements

awg chip
AWG Chip

A packaged Arrayed waveguide

Grating optical mux/demux module

Bare AWG chip

references
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