Two-Photon-Absorption-Based OSNR Monitor for NRZ-PSK Transmission Systems

  title={Two-Photon-Absorption-Based OSNR Monitor for NRZ-PSK Transmission Systems},
  author={D A Reid and K. Bondarczuk and K. J. Dexter and Kai Shi and P. M. Anandarajah and L. P. Barry and Wei-hua Guo and John O'dowd and Mark Lynch and A Louise Bradley and J. D. F. Donegan},
  journal={IEEE Photonics Technology Letters},
A two-photon absorption microcavity-based technique for monitoring in-band optical signal-to-noise ratio (OSNR) in nonreturn-to-zero phase-shift-keying systems is presented. Experiments using a 10-Gb/s differential phase-shift-keying system showed that accurate measurements (±1 dB) were possible for OSNRs in excess of 20 dB. 
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