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Optimization of high speed coherent optical receivers in terms of power consumption and complexity can be achieved by processing received signals in the analog domain without converting them into the digital domain. At a particular data rate an equalizer based on analog delay cells alone will be limited by the link distance. It is due to the reduction of the overall bandwidth of cascaded delay cells...
Compensating for frequency offset between transmitter and receiver lasers is a major challenge in coherent optical receivers. This necessitates the use of a carrier phase recovery and compensation circuitry at the receiver end which is capable of tracking large frequency offsets and laser linewidths. We propose a frequency detector which is capable of detecting frequency offsets from −100MHz to +100...
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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