A "black-box" phase sensitive amplifier is presented achieving simultaneous suppression of deterministic phase distortion on two independent 42.66 Gbit/s DPSK modulated signal wavelengths.
Future optical networks will require the implementation of very high capacity (and therefore spectral efficient) technologies. Multi-carrier systems, such as Orthogonal Frequency Division Multiplexing (OFDM) and Coherent WDM (CoWDM) are promising candidates. In this paper we present analytical, numerical and experimental investigations of the impact of the relative phases between optical subcarriers of CoWDM systems, and the effect that the number of independently modulated subcarriers can have to the performance. We numerically demonstrate a 5-subcarrier and 3-subcarrier 10Gbaud CoWDM system with direct detected ASK and differentially/coherently detected (D)PSK. The simulation results are compared to experimental measurements of a 32Gbit/s DPSK CoWDM system in two configurations. The first configuration was a practical 3-modulator array where all 3 subcarriers were independently modulated, the second configuration being a traditional 2-modulator odd/even configuration, were only odd and even subcarriers were independently modulated. Simulation and experimental results both indicate that the independent modulation implementation has a greater dependency on the relative phases between subcarriers, with a stronger penalty for the center subcarrier, than the odd/even modulation scheme.
In this paper we report field transmission of a 2 Tbit/s multi-banded Coherent WDM signal over BT Ireland's installed SMF, using EDFA amplification only, with mixed Ethernet (with FEC) and PRBS payloads. To the best of our knowledge, the results obtained represent the highest total capacity transmitted over installed SMF with orthogonal subcarriers. BERs below 10(-5) and no frame-loss were recorded for all 49 subcarriers. Extended BER measurements over several hours showed fluctuations that can be attributed to PMD and to dynamic effects associated with clock instabilities.
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