Abstract

This paper demonstrates the use of a single multilayer thin-film stack for generating custom-engineered spatial dispersion, i.e., spatial shift as a function of wavelength. Based on group-velocity effects similar to the superprism effect observed in photonic crystals, this thin-film grating (TFG) device allows for multiplexing or demultiplexing multiple wavelength-division-multiplexed (WDM) channels using a single nonperiodic thin-film stack. We designed a four-channel TFG for coarse WDM applications with 20-nm channel spacing and flat-top passbands. This paper shows that flat-top passbands correspond to a steplike spatial beam shifting with wavelength. The influence of a finite beamwidth on the passband shape is discussed using Fourier decomposition of the beam into plane-wave components. The paper concludes with experimental results for a three-channel TFG demonstrating steplike beam shifting.

© 2004 IEEE

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J. Lightwave Technol. (1)

Other (12)

M. Gerken and D. A. B. Miller, "Thin-film (DE)MUX based on step-like spatial beam shifting", presented at the IEEE LEOS 2002 Annu. Meeting, Glasgow, U.K.,Nov. 10-14, 2002,Paper ThV 3.

J. W. Goodman, Introduction to Fourier Optics, New York: McGraw-Hill, 1996.

A. V. Oppenheim, R. W. Schafer and J. R. Buck, Discrete-Time Signal Processing, Englewood Cliffs, NJ: Prentice-Hall, 1999.

I. N. Bronstein, K. A. Semendjajew, G. Musiol and H. Muehlig, "Verlag Harri Deutsch, Thun und Frankfurt am Main", Taschenbuch Math., pp. 232-237, 1993.

R. Ramaswami and K. N. Sivarajan, Optical Networks: A Practical Perspective, San Mateo, CA: Morgan Kaufmann, 1998.

C. K. Madsen and J. H. Zhao, Optical Filter Design and Analysis-A Signal Processing Approach , New York: Wiley, 1999.

H. A. MacLeod, Thin-Film Optical Filters, Bristol: U.K.: Institute of Physics, 2001.

B. E. Nelson, M. Gerken, D. A. B. Miller, R. Piestun, C.-C. Lin and J. S. Harris, Jr., "Use of a dielectric stack as a one-dimensional photonic crystal for wavelength demultiplexing by beam shifting", Opt. Lett., vol. 25, no. 20, pp. 1502 -1504, 2000.

M. Gerken and D. A. B. Miller, "Multilayer thin-film structures with high spatial dispersion", Appl. Opt., vol. 42, no. 7, pp. 1330 -1345, 2003.

M. Gerken and D. A. B. Miller, "Wavelength demultiplexer using the spatial dispersion of multilayer thin-film structures", IEEE Photon. Technol. Lett., vol. 15, pp. 1097 -1099, Aug. 2003.

J. A. Dobrowolski and R. A. Kemp, "Refinement of optical multilayer systems with different optimization procedures", Appl. Opt., vol. 29, no. 19, pp. 2876-2893, 1990.

N. Matuschek, F. X. Kärtner and U. Keller, "Theory of double-chirped mirrors", IEEE J. Select. Topics Quantum Electron. , vol. 4, pp. 197-208, Apr. 1998.

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