Abstract
A technique to suppress optical nonlinearities is demonstrated using adaptive optical domain post distortion. The concept, rooted in electrical domain linearization, mitigates optical nonlinearities by generating sidebands that are equal but opposite in phase from the unwanted components. We model and experimentally demonstrate >20 dB extinction in four wave mixing by an adaptive phase controller and computer feedback loop.
Highlights
IntroductionElectronic pre- and post- distortion techniques have proven to be a highly versatile technique for suppressing intermodulation distortion in RF and optical communication links [1,2,3]
Electronic pre- and post- distortion techniques have proven to be a highly versatile technique for suppressing intermodulation distortion in RF and optical communication links [1,2,3]. These techniques rely on intentional generation of intermodulation tones that are equal in amplitude and opposite in phase to those produced by the nonlinear device or the transmission medium
As a proof of concept, the system is used to adaptively suppress Four Wave Mixing (FWM) components produced by the third order nonlinearity of optical fiber
Summary
Electronic pre- and post- distortion techniques have proven to be a highly versatile technique for suppressing intermodulation distortion in RF and optical communication links [1,2,3]. These techniques rely on intentional generation of intermodulation tones that are equal in amplitude and opposite in phase to those produced by the nonlinear device or the transmission medium. Both these functions, i.e. generation and shaping of intermodulation tones, are performed in. The adaptive control is the key in producing a robust solution where a high level of FWM suppression is achieved for a wide range of optical powers and fiber lengths
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