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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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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DOI: https://doi.org/10.1023/A:1006978819730