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Fiber Amplifiers

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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  1. Fiber Amplifiers • Compensating loss • Avoiding electrical domain • Raman 1300nm • EDFA 1550nm

  2. Raman Amplifier • Stimulated Raman Scattering (SRS) • Stokes Shift - phonon energy - frequency shift • Distributed amplification - in signal fiber • Broad bandwidth • Needs powerful pumplasers • Raman Matures

  3. Stimulated Raman Scattering

  4. Raman Gain

  5. 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

  6. EDFA • High efficency, 11dB/mW • Pump wavelength well separeted from signal wavelength.

  7. Baskjb

  8. Today • Old Telecommunications fibers at 1300nm • Upgrading problems • New communications fibers at 1550nm • EDFA in today’s WDM - systems

  9. 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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