Abstract
The transmission impairments of a Raman amplified link using dual-polarization 16-quadrature amplitude modulation (DP-16QAM) are experimentally characterized. The impact of amplitude and phase nois ...
Highlights
Unrepeatered transmission systems provide a low-complexity and cost-effective solution for point-to-point connections on the order of a few hundred kilometers
A two-bit digital to analog converter (DAC) with 19 GHz analog bandwidth is employed to convert the binary sequences into four-level pulse amplitude modulation signals, where an additional 77-symbol delay is introduced between the two outputs to drive an IQ modulator with 25 GHz 3 dB bandwidth to generate an optical
The results show that a Q factor above the 8.5 dB hard-decision forward error correction (HD-FEC) limit after 200 km standard single-mode fiber (SSMF) can be achieved with a bidirectional pumping scheme, using an optimized pump power and a small fraction (5%) of the pump in the forward direction
Summary
Unrepeatered transmission systems provide a low-complexity and cost-effective solution for point-to-point connections on the order of a few hundred kilometers. High-order modulation formats and coherent detection using digital signal processing (DSP) have been introduced to increase the transport capacity. In these systems, the distributed Raman fiber amplifier (DFRA) is an attractive alternative to the conventional lumped erbium-doped fiber amplifier (EDFA). The fiber nonlinearity tolerance [1,2,3,4,5,6,7]. Using DRFA with a large effective area fiber, unrepeatered transmission of a 30 Gbaud dual-polarization quadrature phase shift keying (DP-QPSK) over 444 km [2]
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