Abstract

An analytic method of spatial phase modulation based on Fourier analysis is introduced for the design of a planar waveguide demultiplexer with a flat-top spectral response. An analytic formula for an etched diffraction grating demultiplexer is derived using the scalar diffraction theory. The spatial phase modulation is realized by slightly adjusting each grating facet's position according to the analytic formula to obtain a spectral response with a flat top and sharp transitions as well as a good dispersion characteristic. The analytic formula is characterized by two parameters: a transverse shift distance and a profile exponent for the phase modulation. A linear relation between the passband width and the transverse shift distance is given, and an optimal figure of merit of the spectral response is obtained by choosing an appropriate profile exponent. A numerical example of a typical SiO 2 etched diffraction grating demultiplexer is used to demonstrate the advantages of this method.

© 2003 IEEE

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  14. M. C. Parker and S. D. Walker, "Design of arrayed waveguide grating using hybrid Fourier-Fresnel transform techniques", IEEE J. Select. Topics Quantum Electron., vol. 5, pp. 1379-1384, 1999.
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J. Lightwave Technol. (1)

Other (14)

M. K. Smit, "Phasar-based WDM-devices: Principles, design and applications", IEEE J. Select. Topics Quantum Electron., vol. 2, pp. 236-250, Mar./Apr. 1996.

C. Cremer, N. Emeis, M. Schier, G. Heise, G. Ebbinghaus and L. Stoll, "Grating spectrograph integrated with photodiode array in InGaAsP/InGaAs/InP", IEEE Photon. Technol. Lett., vol. 4, pp. 108-110, Jan. 1992.

J.-J. He, et al. "Integrated polarization compensator for WDM waveguide demultiplexers", IEEE Photon. Technol. Lett., vol. 11, pp. 224-226, Feb. 1999.

K. Okamoto and A. Sugita, "Flat spectral response arrayed-waveguide grating multiplexer with parabolic waveguide horns", Electron. Lett., vol. 32, no. 18, pp. 1661-1662, 1996.

J. B. D. Soole, et al. "Use of multimode interference couplers to broaden the passband of wavelength-dispersive integrated WDM filters", IEEE Photon. Technol. Lett., vol. 8, pp. 1340-1342, Oct. 1996.

D. Dai, S. Liu, S. He and Q. Zhou, "Optimal design of an MMI coupler for broadening the spectral response of an AWG demultiplexer", J. Lightwave Technol., vol. 20, no. Nov., pp. 1957-1961, 2002.

C. Dragone, "Frequency routing device having a wide and substantially flat passband", May 2, 1995.

A. Rigny, A. Bruno and H. Sik, "Multigrating method for flattened spectral response wavelength multi/demultiplexer", Electron. Lett., vol. 33, no. 20, pp. 1701-1702, 1997.

J.-J. He, "Phase-dithered waveguide grating with flat passband and sharp transitions", IEEE J. Select. Topics Quantum Electron., vol. 8, pp. 1186-1193, Nov./Dec. 2002.

R. Marz and C. Cremer, "On the theory of planar spectrographs", J. Lightwave Technol. , vol. 10, pp. 2017-2022, Dec. 1992.

J.-J. He, B. Lamontagne, A. Delage, L. Erickson, M. Davies and E. S. Koteles, "Sources of crosstalk in grating based monolithic integrated wavelength demultiplexers", presented at the Int. Conf. Application Photonic Technology, Ottawa, ON, Canada,July 27-30, 1998.

M. C. Parker and S. D. Walker, "Adaptive chromatic dispersion controller based on an electro-optically chirped arrayed-waveguide grating", in Optical Fiber Communication Conf., vol. 2, 2000, pp. 257-259.

M. C. Parker and S. D. Walker, "Design of arrayed waveguide grating using hybrid Fourier-Fresnel transform techniques", IEEE J. Select. Topics Quantum Electron., vol. 5, pp. 1379-1384, 1999.

S. Janz, et al. "The scalable planar waveguide component technology: 40 and 256-channel echelle grating demultiplexers", presented at the Proc. Integrated Photonics Research, Vancouver, BC, Canada,July 17-19, 2002,Paper IFE1.

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