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Digital pre-compensation of flex-grid ROADM filters is demonstrated in a 100G CFP transponder operating on the 37.5GHz grid. A single, optimized preequalization filter is used to compensate filtering effects of multiple concatenated ROADMs doubling the number of ROADMs per link from three to six.
Passband filtering and in-band crosstalk penalties are investigated using WSS filter shapes fitted using a supergaussian model and an analytical model. The analytical model is determined to be more accurate than the supergaussian model for stopband fitting and crosstalk penalty assessment.
The tradeoff between filtering and crosstalk penalties is investigated for ROADM sequences configured in broadcast-and-select or route-and-select ROADM architectures transmitting PDM-8QAM and PDM-16QAM signals routed as individual channels or super-channels within the 37.5GHz grid.
A novel blind frequency domain channel estimation scheme is proposed and demonstrated. Numerical results show the scheme is efficient in narrowband filtering compensation and is very robust to channel estimation noise.
We present a novel DSP architecture that identifies multi-gigabit photonic assisted RF signals with minimum prior knowledge of the received signal. Experimental investigation demonstrates successful identification of optically generated RF carriers modulated with 8 Gbaud BPSK/QPSK/8-QAM/16-QAM, after wireless transmission over 1 m in the V-band.
A joint-DSP strategy for superchannel coherent optical systems is described and demonstrated. The proposed joint inter-channel interference cancellation algorithm is shown to be effective in the nonlinear transmission regime, yielding 5dB OSNR improvement.
A computationally efficient frequency domain implementation of a fractionally-spaced equalizer with inter-channel spectral alignment is proposed for inter-channel-crosstalk cancellation. The algorithm is an essential component of crosstalk cancellation and reduces the complexity without sacrificing performance.
A digital inter-channel-crosstalk pre-compensator for WDM “superchannel” systems is proposed and demonstrated to outperform a conventional ISI pre-compensator with 2dB crosstalk suppression at the optimum optical filter bandwidth and increase tolerance to net filter bandwidth.
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