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Remodulation and filtering of WDM channels using the optical injection locking technique

The utilization of the optical injection locking technique in WDM receivers is investigated. As the locking bandwidth is controlled by the amount of injected optical power, only the WDM carrier within a given locking range induces the locking of the slave semiconductor laser and is properly transmitted. In addition, by using a feed-forward laser current approach along with the injection process, the remodulation and/or reshaping of the selected channel information can be performed. It was experimentally observed that feed-forward semiconductor lasers under injection locking have the potential to be used as optical filters, offering up to 40 dB extinction ratio, and remodulators, for 940 Mb/s optical channels.