Abstract
We experimentally demonstrate the simultaneous compensation of both dispersion and nonlinear effects in a 100 km optical fiber link using optical phase conjugation of a 21 GB aud QPSK and 16QAM signal with nonlinear SOAs. Error-free performance is recorded for a launched power of up to 12 dBm, without any digital signal processing to compensate for distortions due to chromatic dispersion and nonlinear effects in fiber. The performance is verified for operation across the C-band.
Highlights
Implementation of advanced modulation formats such as power monitor (PM)-QPSK and PM-16QAM has been possible in optical communication systems through efficient digital signal processing, typically at the receivers
All-optical techniques - especially Optical Phase Conjugation (OPC) - with mid-span spectral inversion has proved to be effective in compensating for impairments induced by both dispersion and nonlinearity in fibers [3]–[7]
We have experimentally demonstrated the feasibility of nonlinear SOA as a medium for optical phase conjugation process
Summary
Implementation of advanced modulation formats such as PM-QPSK and PM-16QAM has been possible in optical communication systems through efficient digital signal processing, typically at the receivers. Even though advanced machine learning algorithms have been used in the recent past for nonlinearity compensation [2], the corresponding signal processing overheads are typically large In this context, all-optical techniques - especially Optical Phase Conjugation (OPC) - with mid-span spectral inversion has proved to be effective in compensating for impairments induced by both dispersion and nonlinearity in fibers [3]–[7]. Phase conjugation finds applications in time reversing the scattering processes for countering atmospheric turbulence and biological imaging in highly turbid samples [8] Most of these demonstrations have used highly nonlinear fibers or periodically poled Lithium Niobate as the nonlinear medium - both of which require power levels, typically larger than 100 mW to initiate nonlinear effects.
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