Fiber amplifiers
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Fiber Amplifiers. Compensating loss Avoiding electrical domain Raman 1300nm EDFA 1550nm. Raman Amplifier. Stimulated Raman Scattering (SRS) Stokes Shift - phonon energy - frequency shift Distributed amplification - in signal fiber Broad bandwidth Needs powerful pumplasers

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Fiber Amplifiers

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Fiber amplifiers

Fiber Amplifiers

  • Compensating loss

  • Avoiding electrical domain

  • Raman 1300nm

  • EDFA 1550nm


Raman amplifier

Raman Amplifier

  • Stimulated Raman Scattering (SRS)

  • Stokes Shift - phonon energy - frequency shift

  • Distributed amplification - in signal fiber

  • Broad bandwidth

  • Needs powerful pumplasers

  • Raman Matures


Stimulated raman scattering

Stimulated Raman Scattering


Raman gain

Raman Gain


Fiber amplifiers

EDFA

  • Most sucessful Rare Earth amplifier

  • Allows amplification of wavelengths with minimal absorbtion in todays fibers

  • Is in exited state for a long time (10ms), this gives low noise level and good performance


Fiber amplifiers

EDFA

  • High efficency, 11dB/mW

  • Pump wavelength well separeted from signal wavelength.


Baskjb

Baskjb


Today

Today

  • Old Telecommunications fibers at 1300nm

  • Upgrading problems

  • New communications fibers at 1550nm

  • EDFA in today’s WDM - systems


Future resarch

Future & Resarch

  • Pumplasers

  • Bandwidth and Length

    • Today EDFA amplifies uses the C- and L band

    • Praseodynium-doped selinid opens the L+ band

    • Raman amplifiers opens the S band


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