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We present a 2.3-Tbit/s network switching element by exploiting double-pass LCoS technology and bidirectional nonlinear effects inside a single HNLF. We demonstrate 2.3-Tbit/s grooming switch with simultaneous functions of add/drop, data exchange, and power equalization, for 23-channel 100-Gbit/s RZ-DQPSK signals.
We report phase-transparent DQPSK data exchange using parametric depletion in a highly nonlinear fiber. 100-Gbit/s DQPSK data exchange is demonstrated with a power penalty less than 5dB. Pump misalignment tolerance (+/-2ps) and input signal power dynamic range (~20dB) are investigated.
Effects of CD and first order PMD on the shape of the constellation diagrams of DQPSK systems are presented, and by quantifying variations in the constellation diagrams, a figure of merit is obtained which can be used for computing the amount of dispersion.
We propose a technique using artificial neural networks (ANNs) to simultaneously identify I/Q data misalignment and data/carver misalignment in both parallel-type and serial-type RZ-DQPSK transmitters. A correlation coefficient of 0.99 is obtained by using a 3-input ANN for the parallel case and a 2-input ANN for the serial case.
We experimentally demonstrate a monitoring method for determining misalignment between the I/Q data streams and between the data and pulse-carving in an 80-Gbit/s serial RZ- DQPSK transmitter. We show a dynamic-range of 8 dB for I/Q data misalignment and 6 dB for data to carver misalignment.
We demonstrate a non-coherent receiver design requiring only a single delay-line interferometer. Demodulation of 43-Gb/s RZ-DQPSK is experimentally demonstrated with no penalty when compared to a traditional DQPSK receiver using two interferometers. Receiver alignment tolerances are quantified via simulation.
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