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Transmission passband, optical crosstalk and cascadability of free-space concave grating demultiplexer for dense WDM networks

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Abstract

We describe the performance of a 100 channel free-space concave grating demultiplexer with 1dB transmission passband of ±7GHz (FWHM 14–22GHz). The influence of optical aberrations and defocusing on the transmission spectrum is demonstrated. Crosstalk between neighbouring channels separated by >0.3nm is lower than −25dB and no penalty due to crosstalk is observed using 2.6Gbit/s directly modulated DFB lasers. Penalty-free transmission through a cascade of 30 demultiplexers is demonstrated in an optical fibre recirculating loop experiment, and the permitted tolerances on the laser frequency misalignments for a larger number of cascaded demultiplexers are investigated.

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Authors and Affiliations

  1. Department of Electronic and Electrical Engineering, University College London, Torrington Place, London, WC1E 7JE, UK

    F. N. Timofeev, E. G. Churin, P. Bayvel, V. Mikhailov, D. Rothnie & J. E. Midwinter

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  1. F. N. Timofeev
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  2. E. G. Churin
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  3. P. Bayvel
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  4. V. Mikhailov
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  5. D. Rothnie
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  6. J. E. Midwinter
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Timofeev, F.N., Churin, E.G., Bayvel, P. et al. Transmission passband, optical crosstalk and cascadability of free-space concave grating demultiplexer for dense WDM networks. Optical and Quantum Electronics 31, 227–236 (1999). https://doi.org/10.1023/A:1006978819730

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