The optical injection locking technique applied to the filtering and remodulation of WDM channel

"The use of the optical injection locking technique for information processing in WDM systems is experimentally 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. The other carriers are absorbed inside the laser structure. 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 injection-locked feed-forwarded semiconductor lasers have the potential to be used as optical filters, offering up to 40 dB extinction ratio, and as remodulators, for a 940 Mb/s optical channel."