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The in-band OSNR of SP and DP QPSK signals were measured over a range of 10 to 21dB ±1dB using a pair of polarisation independent Michelson fibre interferometers without the requirement for prior knowledge of the signal's coherence properties.
We demonstrate long-haul transmission of 50-Gb/s RZ and NRZ-DQPSK signals generated using an electroabsorption-based optical vector modulator. Transmission over 1650 km is achieved with less than 1.2 dB OSNR penalty relative to back-to-back performance.
We experimentally demonstrate simultaneous demodulation of wavelength division multiplexed (WDM) DQPSK signals with a single arrayed waveguide grating (AWG). We then compare this receiver to the conventional one in presence of nonlinear phase noise.
We find a large range of interferogram delay for which OSNR estimation is correct to within 1.5 dB for 46 Gbps PolMux QPSK. This permits accurate OSNR measurement without a priori knowledge of the filter shape.
In a new transmission format the output of a 10 Gb/s convolutional FEC encoder is directly mapped on an optical 10 Gbaud DQPSK signal. Versus 10 Gb/s DPSK, 4.5 dB OSNR gain is predicted without any increase of bandwidth.
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