Two-photon absorption for optical clock recovery in OTDM networks

Reza Salem, Amir Ali Ahmadi, Gaston E. Tudury, Gary M. Carter, Thomas E. Murphy

Research output: Contribution to journalArticlepeer-review

14 Scopus citations


The authors describe the design and performance of an ultrafast optical clock recovery system that is based on two-photon absorption (TPA) in a silicon avalanche photodiode. Unlike many other optical clock recovery techniques, the system is shown to be polarization insensitive, broadband, low jitter, and scalable to high data rates. Moreover, the system is simple, economical, and suitable for integration with silicon electronics. Successful operation of the system is reported for speeds up to 80 Gb/s and transmission distances up to 840 km using a recirculating loop. The authors introduce a new dithering detection scheme that dramatically improves the dynamic range and decreases polarization and wavelength dependence, without introducing an additional timing jitter. The system achieves a dynamic range of 10 dB and optical bandwidth exceeding 35 nm.

Original languageEnglish (US)
Pages (from-to)3353-3361
Number of pages9
JournalJournal of Lightwave Technology
Issue number9
StatePublished - Sep 2006
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics


  • Nonlinear optics
  • Optical communication
  • Optical-signal processing
  • Phase-locked loops (PLLs)
  • Photodiodes
  • Polarization
  • Synchronization
  • Timing jitter


Dive into the research topics of 'Two-photon absorption for optical clock recovery in OTDM networks'. Together they form a unique fingerprint.

Cite this