All-optical in-band OSNR monitoring at 40 Gb/s using a nonlinear optical loop mirror

@article{Adams2006AllopticalIO,
  title={All-optical in-band OSNR monitoring at 40 Gb/s using a nonlinear optical loop mirror},
  author={Ryan Christopher Adams and Martin Rochette and T T Ng and B. J. Eggleton},
  journal={IEEE Photonics Technology Letters},
  year={2006},
  volume={18},
  pages={469-471}
}
We present an all-optical in-band optical signal-to-noise ratio (OSNR) monitor using a nonlinear optical loop mirror. Monitoring is enabled from the nonlinear power transfer function of the loop mirror. Experimental results are provided at 40 Gb/s for three modulation formats: nonreturn-to-zero, carrier-suppressed return-to-zero, and return-to-zero. The monitor discriminates the various OSNR levels over a dynamic range of more than 25 dB with every modulation format