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Our modeling experts will provide a number of technical presentations on various design and analysis topics. Please find a short list below:
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S. Dris, A. Richter (VPIphotonics)
Session 6: Optical Components for Datacenter Networks (Paper 10946-19) – Wed 6 Feb 2019, 9:10am - 9:40am
Abstract: A significant amount of R&D effort has been expended recently in finding Shannon capacity-approaching modulation schemes for optical communications. Probabilistic shaping (PS) of QAM constellations has emerged as a particularly attractive solution, allowing fine-grain adjustment of bit-loading, which can be traded off for transmission reach; this approach is ideal for realizing flexible, bandwidth-variable transceivers. PS-QAM, as well as other techniques such as digital subcarrier multiplexing (DSCM), pose significant challenges for the design of transceivers. In particular, the resolution of the digital-to-analog and analog-to-digital converters (DACs/ADCs) becomes critical, if the full benefits of advanced formats are to be obtained.
We present results of our investigation on applying intentionally nonuniform quantization in optical transceivers, as a means of relaxing DAC resolution requirements. By matching the quantizer's transfer function to the distribution of the signal amplitudes, quantization noise can be minimized. This novel approach can lower component cost and power consumption, potentially bringing advanced modulation formats to short-haul/metro links. Moreover, transceivers in the less cost-sensitive long-haul market segment can also profit from increased performance, due to higher signal-to-quantization noise ratio (SQNR). We show how to derive the nonuniform levels for any given modulation format, and quantify by means of extensive simulations the performance gain of the overall coherent system.
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