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An optimum solution for a low power and low cost coherent optical receiver design can be obtained by a self homodyne (SH) system that uses analog domain processing. An SH system eliminates the need of a local oscillator (LO) and a carrier phase recovery (CPR) module at the receiver. Due to the inherent line-width tolerance of SH systems, an expensive laser is not required at the transmitter. In digital...
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...
Several terabytes of data get generated and transferred through the Internet everyday. With bandwidth-intensive on-line applications such as video, music, and voice the demand for higher data rate increases. The ever-increasing data rate demand will be supported by multilevel signaling over fiber-optic links in the backplane. Traditional coherent optical links use the power hungry ADC+DSP approach...
Coherent techniques are expected to be used to meet the demand for higher data rates in short-reach optical links in the near future. Digital coherent receivers used for long haul applications are not suitable for short-reach links because of excessive power dissipation, size, and cost. The power consumption, size, and cost of the receiver can be drastically reduced by processing signals in the analog...
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...
By employing a novel scheme we have generated 112.8-Gb/s polarization-multiplexed (PM)-RZ-64QAM optical signal. Transmission of 112.8-Gb/s PM-RZ-64QAM optical signal over 2??40km of SSMF has been demonstrated in an 8-channel WDM environment on a 12.5GHz grid.
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