16.711 Lecture 8 Optical Fiber Amplifier

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16.711 Lecture 8 Optical Fiber Amplifier noise
and BER
Last lecture

• Introduction to Fiber Optical Amplifier types
  and applications
• Erbium-doped fiber amplifier (EDFA)
• External pumping and amplifier gain
• Power-conversion efficiency and gain profile

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16.711 Lecture 8 Optical Fiber Amplifier noise
and BER
Today

• Amplifier Noise
• OSNR and BER
• System Applications

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16.711 Lecture 8 Optical Fiber Amplifier noise
and BER
Einsteins A and B coefficients
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16.711 Lecture 8 Optical Fiber Amplifier noise
and BER
Noise Power
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16.711 Lecture 8 Optical Fiber Amplifier noise
and BER
Amplified spontaneous noise
Noise Power spectral density
Total ASE power
Total power
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16.711 Lecture 8 Optical Fiber Amplifier noise
and BER
Receiver noise
Total photo-detector current
R is the resistance of the detector load
resistor.
Total ASE power
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16.711 Lecture 8 Optical Fiber Amplifier noise
and BER
Receiver noise
Total photo-detector current
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16.711 Lecture 8 Optical Fiber Amplifier noise
and BER
Gain and Noise Figure
Total photo-detector current
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16.711 Lecture 8 Optical Fiber Amplifier noise
and BER
Amplifier System Noise figure (NF)
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16.711 Lecture 8 Optical Fiber Amplifier noise
and BER
BER calculation
Quantum limit detection, Poissons equation
Gaussian Noise Statistics
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16.711 Lecture 8 Optical Fiber Amplifier noise
and BER
BER calculation

• OSNR 10dB for 2.5GBit/s

• OSNR 15dB for 10GBit/s

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16.711 Lecture 8 Optical Fiber Amplifier noise
and BER
PreAmp
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16.711 Lecture 8 Optical Fiber Amplifier noise
and BER
In-line Amp
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16.711 Lecture 8 Optical Fiber Amplifier noise
and BER
Amplifier Chain
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16.711 Lecture 8 Optical Fiber Amplifier noise
and BER
Amplifier Chain
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16.711 Lecture 8 Optical Fiber Amplifier noise
and BER
Amplifier Chain
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16.711 Lecture 8 Optical Fiber Amplifier noise
and BER
Amplifier Chain
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16.711 Lecture 8 Optical Fiber Amplifier noise
and BER
Amplifier Chain