Abstract
This work presents an evaluation of the crosstalk impact on the signal-to-noise ratio (SNR) of long-distance C and L band wavelength-division multiplexing (WDM) systems using homogeneous multicore fibers with weakly coupled cores. It is experimentally shown that the crosstalk-induced SNR penalty is independent of the transmission distance on sufficiently long uniform links. This results from the approximately linear scaling of the noise contributions from amplified spontaneous emission, fiber nonlinearity, and crosstalk with the transmission distance. The crosstalk-induced SNR penalty on C and L band WDM long distance links is experimentally evaluated, showing significant degradation of signals located towards the long edge of the L-band. Up to 3.8 dB penalty was observed on a 3866 km link, in agreement with theoretical predictions. We perform a theoretical analysis of the wavelength allocation of densely packed channels for long distance WDM systems with and without the presence of crosstalk. It is shown that these systems favor the use of relatively short transmission wavelength ranges to minimize the crosstalk impact at long wavelengths. This contrasts with systems without crosstalk, which favor the low loss wavelength region of the transmission fiber.
Highlights
S PATIAL-DIVISION multiplexing (SDM) has recently been considered as a promising response to the exponential increase in capacity demand for optical fiber communications networks [1], [2]
This work presented an evaluation of the crosstalk-induced degradation of the signal-to-noise ratio in long-distance C and L band wavelength-division-multiplexing systems using homogeneous multicore fibers
The design of wavelength-division-multiplexing systems using homogeneous multicore fibers must take into account the wavelength dependence of crosstalk
Summary
S PATIAL-DIVISION multiplexing (SDM) has recently been considered as a promising response to the exponential increase in capacity demand for optical fiber communications networks [1], [2]. The main limitation of MCFs for long-distance transmission is perhaps inter-core XT resulting from residual coupling between cores [9] This phenomenon and its impact on the performance of optical transmission systems has been extensively described in works such as [9]–[12] and was shown to have a strong influence on the spectral efficiency limits [13]–[17]. It is experimentally shown that the crosstalk tilt between the short edge of the C band and the long edge L band may reach 10 dB, severely degrading signals located at longer wavelengths We evaluate this degradation experimentally, showing higher than 3 dB penalty on a 3866 km link through a 7-core MCF.
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