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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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slide1

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
slide2

16.711 Lecture 8 Optical Fiber Amplifier – noise and BER

Today

  • Amplifier Noise
  • OSNR and BER
  • System Applications
slide3

is the distribution function.

is number of optical modes at v.

16.711 Lecture 8 Optical Fiber Amplifier – noise and BER

Einstein’s A and B coefficients

slide4

is the spontaneous factor.

16.711 Lecture 8 Optical Fiber Amplifier – noise and BER

Noise Power

slide5

16.711 Lecture 8 Optical Fiber Amplifier – noise and BER

Amplified spontaneous noise

Noise Power spectral density:

Total ASE power:

Total power:

slide6

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:

slide7

16.711 Lecture 8 Optical Fiber Amplifier – noise and BER

Receiver noise

Total photo-detector current:

slide8

16.711 Lecture 8 Optical Fiber Amplifier – noise and BER

Gain and Noise Figure

Total photo-detector current:

slide9

External control

Electronics

Detector

980 pump

EDF

Output

Input

5%Tap

WDM

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, Poisson’s 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