Abstract
The background of our research is, designing a precise phase detection sensor for high-speed coherent homodyne systems, and combining it with optical phase-locked loops (OPLLs) to achieve coherent demodulation and carrier recovery. For existing phase sensors, there are problems, such as low phase gain, long dead-time, and difficulty in distinguishing directions. Therefore, we proposed a multilevel-loop compound control phase sensor based on exclusive-OR gates. The sensing system consists of three loops. The tunable range of the temperature loop is 30 GHz. Its tuning rate value is 50 MHz/s. In addition, the inner ring consists of a piezoelectric loop and an acousto-optic frequency shifter loop. According to demand, we established a relevant model, and analyzed and calculated the parameters. The reliability and validity of this sensor are substantiated after setting up the experimental environment. The results show that the lock-in range is 30 GHz, the bandwidth is 1.5 MHz, and the real-time performance of the PLL is improved. In a communication test with a rate of 5 Gbps, the realized bit error ratio is $1.55\times 10-8$ when the optical power of the signal is −40.4 dBm. Therefore, this sensor system improves detection sensitivity. At the end of this paper, we propose some ideas to improve sensitivity, which will be the focus of our next phase.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.