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A commercial silicon-based variable optical attenuator has been converted to a low bandwidth (quasi-CW) light monitor through an ion implantation and annealing process. The measured total optical loss of the device is <5 dB while the responsivity per tapped fraction is 1 mA/W/dB. The straightforward manner in which the monitoring functionality is induced suggests a cost-effective route to CW optical monitors using a widely available commercial product.
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http://iet.metastore.ingenta.com/content/journals/10.1049/el.2010.2785
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content/journals/10.1049/el.2010.2785
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