Quantum nondemolition measurements in optical fibers

Ofer Shapiro*, Moshe Tur

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review


Quantum non-demolition (QND) measurements are of great interest in recent years as a method to increase the information capacity of communication systems. Common implementations of QND measurements in optical fiber are based on the Kerr effect: a probe beam acquires phase modulation which mimics the amplitude modulation of a signal beam. This phase is typically small and needs to be measured at high frequencies for practical fiber-optic communication systems. Here we present a self reflexive interferometer scheme adequate for this kind of measurements and describe its performance. Using this system we achieved fairly open eye-diagrams at 140 Mbit/sec.

Original languageEnglish
Pages (from-to)400-407
Number of pages8
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - 1997
Event10th Meeting on Optical Engineering in Israel - Jerusalem, Israel
Duration: 2 Mar 19972 Mar 1997


  • Kerr effect
  • Optical communication
  • QND
  • Reflexive interferometer


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