Abstract
Digital backpropagation (DBP) is a promising digital-domain technique to mitigate Kerr-induced nonlinear interference. While it successfully removes deterministic signal-signal interactions, the performance of ideal DBP is limited by stochastic effects, such as polarization-mode dispersion (PMD). In this paper, we consider an ideal full-field DBP implementation and modify it to additionally account for PMD; reversing the PMD effects in the backward propagation by passing the reverse propagated signal also through PMD sections, which concatenated equal the inverse of the PMD in the forward propagation. These PMD sections are calculated analytically at the receiver based on the total accumulated PMD of the link estimated from channel equalizers. Numerical simulations show that, accounting for nonlinear polarization-related interactions in the modified DBP algorithm, additional signal-to-noise ratio gains of 1.1 dB are obtained for transmission over 1000 km.
Highlights
The ever-increasing global demand for digital-data traffic has resulted in an accelerated development of the optical networks
In [23], we proposed a Digital backpropagation (DBP) method accounting for polarizationmode dispersion (PMD), where the backward PMD sections are computed analytically using a first-order linearization approach, which we extend in this work
We studied the achievable performance by ideal full-field DBP in systems with PMD
Summary
The ever-increasing global demand for digital-data traffic has resulted in an accelerated development of the optical networks. Among the many benefits of this technology, it facilitates the use of polarization multiplexing and the recovery of all degrees of freedom of the optical field, improving receiver sensitivity and allowing the use of higher-order modulation formats It naturally suits the use of digital signal processing (DSP) tools to compensate for channel impairments and hardware imperfections. Various nonlinear mitigation techniques are currently under investigation, which can be categorized into two groups: optical and digital techniques Optical solutions such as large effective area fibers [1] allow higher signal launch powers, increasing the available SNR, but transmission is still performed avoiding the nonlinear regime. Compared to [23], we detail the analysis of the proposed method and extend the algorithm to wavelength-division-multiplexed (WDM) systems
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