ece228 lecture 17 [Compatibility Mode]

ece228 lecture 17 [Compatibility Mode] - Bowers ECE 228A...

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Bowers ECE 228A Optical Amplification and Switching Lecture #17 John Bowers CE 228A ECE 228A Read Chapter 6 roject cancelled Can’t assign project for dead week Project cancelled. Can t assign project for dead week Final: Monday, June 7 12-3 pm 2 sided 8.5 x 11” crib sheet roblems: Problems: 1) Laser design 2) Photodetector design 3) Amplifier design ) ink design including issues of dispersion loss fibers laser design 4) Link design including issues of dispersion, loss, fibers, laser design 5) General knowledge
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Bowers ECE 228A Optical Amplifiers
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Bowers ECE 228A Critical Issues for Optical Amplifier Design Gain (10 to 40 dB) in out P P G dP p( z P z g dz ) ( ) ) ( exp( ) ( L g G  ) exp( ) ( gz P z P in Saturation power (0 to 20 dBm) Gain Bandwidth s P P T g g / ) ( 1 ) ( 2 2 2 0 0 –P s is the saturation power 2 1 2 T g g – T 2 is the dipole relaxation time (<1 ps) Polarization dependence (small for fiber amps, large for semiconductor amps) Coupling loss (large for semiconductor amps, solvable for EDFAs) •N o i s e
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Bowers ECE 228A Noise Noise figure in NR SNR Fn 2 ) 1 ( 2 n G G n Fn sp sp out SNR The minimum noise figure is 3 dB 1 2 2 N N N n sp Practically, the noise figure exceeds 3 dB by at least the coupling loss and is usually 6-8dB
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Bowers ECE 228A Amplifier Technologies Doped fiber – Silica glass •EDFA •E t a l . – Chalcoginide fibers • Praseodymium t a l . emiconductor Semiconductor – InGaAsP – InGaAlAs – InGaAsN Raman Brillouin
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Bowers ECE 228A Erbium Energy Levels
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Bowers ECE 228A •Higher pump power makes N 2 >>N 1 , hence n sp approaches 1
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Bowers ECE 228A 0.98 micron pump for preamplifier pp p p 1.48 micron pump for power amplifier
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Bowers ECE 228A Filter Needed Before Photodetector ) 2 ( 2 1 2 1 I I Q Q erfc BER ] ) / 2 ( [ 2 1 5 . 2 1 1 B Q Q F N n p
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Bowers ECE 228A Amp technologies EDFA High performance EDWA Inexpensive
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ece228 lecture 17 [Compatibility Mode] - Bowers ECE 228A...

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