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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-toquantization 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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Digital signal processing
Quantization
Transmitters
Modulation
Optical communications
Transceivers
Quadrature amplitude modulation
