Abstract

We present detailed modeling and experimental results for an improved design of an InGaAsP/InP wavelength demultiplexer based on a monolithically integrated Rowland circle grating. The design incorporated ten wavelength channels at 1.55\;\mum with a uniform spacing of 2 nm. The total on-chip loss was about 10 dB and the crosstalk between adjacent channels was as low as {-}25 dB. It was shown that low-loss etched turning mirrors can reduce the total on-chip loss by about 4 dB compared to traditional 90^irc curved multimode waveguides. By replacing standard flat grating facets with retro-reflecting V-shaped facets in the echelle grating, the loss was further reduced by 4 dB. Polarization independent operation within a passband of 0.5 nm was achieved by using multimode output waveguides. The potential sources producing the crosstalk have been analyzed and fabrication modifications for further improvement are suggested.

[IEEE ]

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  1. L. H. Spiekman, M. R. Amersfoort, A. H. de Vreede, F. P. G. M. van Ham, A. Kuntze, J. W. Pedersen, P. Demeester, and M. K. Smit, "Design and realization of polarization independent phased array wavelength demultiplexers using different array order for TE and TM," J. Lightwave Technol., vol. 14, pp. 991-995, 1996.

J. Lightwave Technol. (1)

L. H. Spiekman, M. R. Amersfoort, A. H. de Vreede, F. P. G. M. van Ham, A. Kuntze, J. W. Pedersen, P. Demeester, and M. K. Smit, "Design and realization of polarization independent phased array wavelength demultiplexers using different array order for TE and TM," J. Lightwave Technol., vol. 14, pp. 991-995, 1996.

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