Near-far problem in noise-based frequency-offset modulation

A multiple-access noise-based frequency offset modulation (N-FOM) system is studied in the context of near-far problem. A closed-form expression for the signal-to-noise ratio is derived and the bit error rate (BER) is evaluated. The result shows that the near-far problem compromises the performance of the multiple-access N-FOM system. Performance comparison with a standard spread-spectrum system indicates that the nearfar problem has an inherently different effect on the N-FOM communication. The error rate of a node in the N-FOM system increases at a much higher rate as the number of simultaneous communication links increases. However for small number of simultaneous links, an adaptive power control scheme can help minimize the threat of the near-far problem

Deep Learning Based Digital Backpropagation Enabling SNR Gain at Low Complexity

A computationally efficient deep learning based digital backpropagation (DL-DBP) algorithm providing a 1.9 dB SNR over a conventional linear compensation (chromatic dispersion compensation algorithm) and a 1 dB gain over a conventional back-propagation algorithm of the same complexity is presented. The algorithm has been tested in a 1200km transmission experiment. Also, if the algorithm is tested against a conventional digital backpropagation algorithm with the gain, then the new algorithm requires a factor 6 lower complexity. We discuss its training procedure and its principle. We discuss its training procedure and its principle.ISSN:0277-786

Plasmonics—high-speed photonics for co-integration with electronics

New high-speed photonic technologies and co-integration with electronics are required to keep up with the demand of future optical communication systems. In this paper, plasmonics is presented as one of the most promising next-generation photonic technologies that already fulfils these requirements in proof-of-concept demonstrations. Plasmonics features not only modulators and detectors of highest speed, but also compactness, cost- and energy-efficiency, and compatibility with CMOS electronics. Recently, co-integration with electronics was demonstrated with record performances of 222 GBd in a hybrid InP electronic-plasmonic transmitter assembly and of 120 GBd with a monolithic BiCMOS electronic-plasmonic transmitter.ISSN:0021-4922ISSN:1347-406