Abstract
We demonstrate the active management of eight~ 0.8-nm-spaced WDM channels using a polarisation-insensitive spatial-light-modulator-based holographic filter. Arbitrary permutations of dropped and passed channels are possible, as are weighted-amplitude passbands that effect power equalisation. Passband spectral engineering, yielding 'top hat' passbands, has also been demonstrated. Suppression of single dropped channels, consistently> 15dB in these experiments, can be straightforwardly improved by deploying an SLM of greater resolution and higher pixel number. The subsystem we have demonstrated could form the key element in both an optical add-drop multiplexer (OADM) and a dynamic multi-channel equaliser. The passband 3-dB width can be straightforwardly reduced to manage multiple channels at the 50-GHz (~ 0.4-nm) spacing of future WDM systems.
© 1999 Optical Society of America
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