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4×10Gbps WDM transmission over low loss HC-PBGF at 2μm wavelengths is demonstrated using a 2mm long QCSE based InP MZM with Vπ of 6V and ER>20dB. An OSNR of 25dB is required to achieve error free transmission.
This paper reviews recent advances in transoceanic distance transmission technology including digital spectral shaping, coded modulation, variable spectral efficiency, and nonlinearity compensation to facilitate higher capacity and higher spectral efficiency.
We transmit 198×100G pre-filtered PDM-RZ-QPSK channels with 400% spectral efficiency over 6,860 km. We also show that 100G coherent nonlinear performance scales differently with distance on uncompensated dispersion maps than expected from direct-detection transmission.
A hybrid polarization division multiplexing (PDM) technique was demonstrated for 40 Gb/s RZ-DPSK signal without polarization tracking receiver (PTR). Long-term Q-factor measurements and DGD tolerance study showed performance similar to offset PDM and regular PDM with PTR.
We demonstrate a new direct-detection polarization-division-multiplexing modulation scheme without polarization tracking. This scheme reduces sensitivity to depolarization and exhibits less Q-factor fluctuations compared to conventional polarization-division-multiplexing.
We present a novel controlled adaptive equalization scheme for dual-polarization coherent receivers and demonstrate data asynchronous operation that ultimately allows for simple clock recovery implementation.
We have quantified the system margin afforded by polarization scrambling with a direct measurement of the errored events from a noise loaded FEC decoder. We have demonstrated a margin enhancement of 1.2 dB after 8,856 km transmission.
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