Abstract
We assess, through numerical simulation, the dependence of the variance of the inter-core crosstalk (ICXT) and the maximum allowable ICXT level on the design parameters of coherent detection MCF systems. The analysed design parameters are the order of the quadrature amplitude modulation (QAM) signals, roll-off factor, time misalignment between the signal in different cores and skew between cores. The results show that, when the roll-off factor is 0, the maximum allowable ICXT level is independent of the skew and decreases for higher QAM orders. For a roll-off factor of 1, the maximum allowable ICXT level depends on the skew and time misalignment of core signals. In this case, the maximum allowable ICXT level increases by 3.6 dB relative to the case of roll-off factor of 0 with null skew, and by 2 dB, when the skew is much higher than the symbol period.
Highlights
The multi-core fiber (MCF) has been studied as a transmission media for space division multiplexing in order to overcome the ever-increasing demand for transmission capacity in telecommunication networks [1]
For a roll-off factor of 1, the maximum allowable ICXT level depends on the skew and time misalignment of core signals
We numerically study through Monte-Carlo (MC) simulation, the variance of the coherently detect ICXT and the influence of ICXT on the OSNR penalty of the coherent detection MCF system, considering different orders of quadrature amplitude modulation (QAM) signals with raised-cosine (RC) pulse shape, roll-off factors, fiber core skews and with time misalignments between the signals transmitted in each MCF core, thereby, extending the results of [4]
Summary
The multi-core fiber (MCF) has been studied as a transmission media for space division multiplexing in order to overcome the ever-increasing demand for transmission capacity in telecommunication networks [1]. Despite the influence of the QAM order on the performance of coherent detection MCF system is studied in [4] and [5], the impact on the optical signal-to-noise (OSNR) penalty due to the roll-off factor and the time misalignment between the signals transmitted in the MCF cores is still to be assessed. We numerically study through Monte-Carlo (MC) simulation, the variance of the coherently detect ICXT and the influence of ICXT on the OSNR penalty of the coherent detection MCF system, considering different orders of quadrature amplitude modulation (QAM) signals with raised-cosine (RC) pulse shape, roll-off factors, fiber core skews and with time misalignments between the signals transmitted in each MCF core, thereby, extending the results of [4]
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