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Receiver electronics dominate power consumption in coherent optical transmission systems. To break this bottleneck, we propose a receiver based on analog domain signal processing and Costas loop. System simulations show that laser linewidths as high as 3 MHz can be tolerated, making it ideal for low cost short range applications such as data centers.
Semiconductor lasers with unstable emission frequencies and large linewidths pose a big challenge for high degree of integration in coherent optical systems. Carrier phase & frequency offsets due to finite laser linewidths and the dispersion introduced by fiber non-idealities would be the major limiting factors in achieving higher data rates in future fiber optic links. Fortuitously, CMOS based...
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