6.4-Tb/s (160/spl times/42.7 Gb/s) transmission with 0.8 bit/s/Hz spectral efficiency over 32/spl times/100 km of fiber using CSRZ-DPSK format

LambdaXtreme® transport system: R&D of a high capacity system for low cost, ultra long haul DWDM transport

“…For example, 128 ϫ 40 Gb/s or 5.12 Tb for 500 km [9], 64 ϫ 40 Gb over 4000 km [6], and 100 ϫ 10 Gb/s over 20,000 km [28] were demonstrated using LambdaXtreme 40 Gb/s and dispersion managed soliton (DMS) technology respectively. Excellent results for dispersion managed cable were also obtained using these testbeds [11,39]. Although these results were only intended as "hero" experiments, they did provide insights for potential product enhancements.…”

“…Analysis and experiments have shown that these effects are at least 3 dB weaker than comparable OOK transmission due to the lower peak power, the phase modulation, and pulse-sequence correlations [20,22,34]. In summary, numerous experiments [2,6,15,28,39] have demonstrated the value of leveraging the Raman and DPSK technologies to achieve significant capacity and reach improvements compared with non-Raman and OOK solutions. represents the required OSNR to achieve 10 Ϫ3 BER.…”

Simultaneous amplitude and phase measurement for periodic optical signals using time-resolved optical filtering

“…Later parts of this paper measure the TROF traces of NRZ-DPSK signals with and without chromatic dispersion and find the corresponding electric field of E(t). Not able to generate in our measurement, RZ-DPSK signal is the dominant signal format [1][2][3][4][5][6][7]. Figures 1(c) and (d) show the TROF traces of RZ-DPSK signal.…”

“…Recently, differential phase-shift keying (DPSK) signal has received renewed interests for longhaul lightwave transmissions [1][2][3][4][5][6][7][8]. Compared with conventional on-off keying, DPSK signal provides 3-dB improvement in receiver sensitivity.…”

Signed frequency offset measurement for direct detection DPSK system with a chromatic dispersion offset

“…Differential phase-shift keying (DPSK) signal is a promising candidate to be applied in the high speed and large capacity systems because of its superior performance compared with conventional on-off keying (OOK) signal such as an improvement of 3dB optical signal-to-noise ratio (OSNR) when balanced detectors (BD) are employed [1][2][3]. The delay interferometer (DI) is always utilized as a demodulator for direct detection DPSK system.…”