In this work we experimentally demonstrate 500 km unrepeatered transmission of a single-channel 100 Gb s −1 dual polarization quadrature phase shift keyed (DP-QPSK) signal. Such long distance transmission is achieved through the use of an advanced configuration of remotely pumped optical amplifiers (ROPAs), chromatic dispersion pre-compensation and ultra-low-loss Corning R SMF-28 R ULL optical fiber. Excellent long-term bit error ratio (BER) performance is observed. To the best of our knowledge this is the longest unrepeatered 100 Gb s −1 transmission reported to date.

In this work we experimentally demonstrate 1 Tbit/s (10 x 100 Gbit/s) unrepeatered transmission over 500.5 km using dual polarization quadrature phase shift keyed (DP-QPSK) format and real-time processing. Such ultra-long distance is enabled by the use of high-performance 100G DP-QPSK transponders (the required optical signal-to-noise ratio is 12 dB), ultra-low loss Corning SMF-28 ULL fiber (the average attenuation of the spools used in this experiment <0.160 dB/km), and optimization of remotely-pumped optical amplifiers. To the best of our knowledge this is the longest unrepeatered 100G-based 1 Tb/s WDM transmission distance reported to date.

No abstract

In this work we experimentally demonstrate 200 Gb•s −1 (2 × 100 G) unrepeatered transmission over 502.1 km using a dual polarization quadrature phase-shift-keyed (DP-QPSK) format and real-time processing. Such ultra-long distance is enabled by the use of high-performance 100 G DP-QPSK transponders (the required optical signal-to-noise ratio is 12 dB), Corning ® SMF-28 ® ULL fiber (the average attenuation of the spools used in this experiment ~0.160 dB km −1 ), and optimization of remotely pumped optical amplifiers, bidirectional Raman amplifiers, and dispersion precompensation.

The kinetics of refractive index change (RIC) in the core of Yb 3+ /Er 3+ fibers at a radiation wave length lying beyond the range of resonant absorption of active ions under pulsed pumping of fiber laser has been analyzed. The measurement of RIC kinetics with a Mach-Zehnder interferometer makes it possible to separate the contributions of the electronic and thermal RIC mechanisms and determine quantitatively the temperature profile inhomogeneity in the fiber. The measured values are compared with the numerical esti mates derived from the spectral properties of the active medium in order to check the modern models of RIC in active fibers.