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Optical Amplifier

Optical Amplifier. Generic optical amplifier. ~10 m Erbium Doped Fiber. 980 nm Pump. Signal. Amplified Signal. Optical Amplifiers. Erbium Doped Fiber Amplifier. Semiconductor Optical Amplifier. Important Parameters: Gain Saturation Output Power Noise Figure.

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Optical Amplifier

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  1. Optical Amplifier

  2. Generic optical amplifier

  3. ~10 m Erbium Doped Fiber 980 nm Pump Signal Amplified Signal Optical Amplifiers Erbium Doped Fiber Amplifier Semiconductor Optical Amplifier • Important Parameters: • Gain • Saturation Output Power • Noise Figure

  4. Optical Amplifier Applications * B. Verbeek, JDSU

  5. Applications of optical amplifiers

  6. Gain Saturation • Output saturation power is defined as the output power when gain drops by 3db • Power amplifiers usually operate at saturation. • Saturation gain is lower than the unsaturated one.

  7. Amplifier gain versus power

  8. Gain versus Amplifier length

  9. Noise Figure • Noise Figure definition is similar as for electrical amplifiers. Essentially a degradation of signal. • However, we do not use the optical SNR, but rather the SNR that would be measured with an “ideal” square-law detector at the input and output of the amplifier. Where E=Electric Field, I=Detector Current, A=Signal amplitude, x,y=Amplifier Spontaneous Emission

  10. Gain Spectrum • Amorphous nature of silica and the codopants inside the fiber affects the spectrum considerably.

  11. Semiconductor Optical Amplifier

  12. Gain vs. Wavelength • 40-80 nm, InGaAs/InGaAsP. Spanning from 1250-1650 nm Single SOA

  13. Output Power • SOAs are linear for small input powers.

  14. THANK YOU EE233

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