Reducing residual amplitude modulation in electro-optic phase modulators by erasing photorefractive scatter

Juna Sathian, Esa Jaatinen

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

Residual amplitude modulation (RAM) is an unwanted noise source in electro-optic phase modulators. The analysis presented shows that while the magnitude of the RAM produced by a MgO:LiNbO3 modulator increases with intensity, its associated phase becomes less well defined. This combination results in temporal fluctuations in RAM that increase with intensity. This behavior is explained by the presented phenomenological model based on gradually evolving photorefractive scattering centers randomly distributed throughout the optically thick medium. This understanding is exploited to show that RAM can be reduced to below the 105 level by introducing an intense optical beam to erase the photorefractive scatter.

Original languageEnglish
Pages (from-to)12309-12317
Number of pages9
JournalOptics Express
Volume21
Issue number10
Early online date13 May 2013
DOIs
Publication statusPublished - 20 May 2013
Externally publishedYes

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