Bidirectional 10 Gbit/s long-reach WDM-PON using digital coherent receivers

Bidirectional transmission at 10 Gbit/s using 3.125 GBaud PDM-QPSK over 100 km of SMF is investigated. We observe no penalty for transmission of 10 GHz spaced channels. Preamplification improves the receiver sensitivity from 45.9 dBm to 53.0 dBm. © 2011 Optical Society of America

Impact of interchannel nonlinearities on a split-step intrachannel nonlinear equalizer

We experimentally investigate the use of split-step intrachannel nonlinear equalizer, for a wavelength-division- multiplexed (WDM) 112-Gb/s nonreturn-to-zero polarization- division-multiplexed quadri-phase-shift keying system using a digital coherent receiver. Our investigations demonstrate that the nonlinear compensation algorithm can increase the reach by 23% in a 100-GHz spacing WDM link compared to 46% for the single-channel case. When the channel spacing is reduced to 50 GHz, the reach improvement is minimal due to the uncompensated interchannel nonlinearities; nevertheless, the system robustness is improved as the system operating power dynamic range is widened by 2 dB. © 2006 IEEE

Impact of Interchannel Nonlinearities on a Split-Step Intrachannel Nonlinear Equalizer

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A long-reach ultra-dense 10 Gbit/s WDM-PON using a digital coherent receiver

We investigate the impact of channel spacing and nonlinear transmission over 120 km of standard single mode fiber for a 10 Gbit/s long-reach wavelength division multiplexed passive optical network (WDM-PON). We employed polarization division multiplexed quadrature phase shift keying (PDM-QPSK), which allowed data transmission at 3.125 GBaud, including a 25% overhead for forward error correction. To receive this spectrally efficient modulation format, a digital coherent receiver was employed, allowing for both frequency selectivity and an increased sensitivity of -45 dBm (25 photons/bit).We investigated a channel spacing as low as 5 GHz, for which the loss budget was 48.6 dB, increasing to 54.0 dB for a 50 GHz grid. © 2010 Optical Society of America