Design of a variable optical attenuator with wavelength selectivity

Tsair Liang Tsai*, Jieh Chian Wu

*Corresponding author for this work

Research output: Contribution to journalJournal Article peer-review

1 Scopus citations


We propose a theoretical design of a high-speed wavelength-selective variable optical attenuator (VOA) constructed by a waveguide-type Raman amplifier and two directional couplers. The VOA can attenuate each incident WDM wavelength individually and simultaneously in a few tens of picoseconds by applying the corresponding pumping wavelength to the Raman amplifier. We define two operation modes, which may allow the attenuation ratio to decrease or increase by increasing the amplification rate of the Raman amplifier. The profile of the attenuation curves of the two operation modes can be flexibly determined by properly selecting the phase angles of the directional couplers. The guidelines to determine these phase angles of the two directional couplers are provided after the operational analyses.

Original languageEnglish
Pages (from-to)331-336
Number of pages6
JournalPhotonic Network Communications
Issue number3
StatePublished - 06 2010
Externally publishedYes


  • Raman amplifier
  • Variable optical attenuator(VOA)
  • WDM
  • Wavelength-selective


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