Optical Ampifier and Detector(03-03-2011)

Optical Ampifier and Detector(03-03-2011) - Optical...

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Photonic Network By Dr. M H Zaidi Optical Amplifiers and Detectors 1
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Photonic Network By Dr. M H Zaidi Optical Amplifiers Optical signal propagating in fiber suffers attenuation Optical power level of a signal must be periodically conditioned Optical amplifiers are a key component in long haul optical communication Optical Amplifier ( G ) Weak signal P in Amplified signal P out ASE ASE Pump Source 2
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Photonic Network By Dr. M H Zaidi Why the Need for Optical Amplification? Semiconductor devices can convert an optical signal into an electrical signal, amplify it and reconvert the signal back to an optical signal. However, this procedure has several disadvantages: Costly Require a large number over long distances Noise is introduced after each conversion in analog signals (which cannot be reconstructed) Restriction on bandwidth, wavelengths and type of optical signals being used, due to the electronics By amplifying signal in the optical domain many of these disadvantages would disappear! 3
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Photonic Network By Dr. M H Zaidi Optical Amplifiers An optical amplifier is characterized by: Gain – ratio of output power to input power (in dB) Gain efficiency – gain as a function of input power (dB/mW) Gain bandwidth – range of wavelengths over which the amplifier is effective Gain saturation – maximum output power, beyond which no amplification is reached Noise – undesired signal due to physical processing in amplifier 4
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Photonic Network By Dr. M H Zaidi Optical Amplifiers Types of amplifiers: Electro optic regenerators Erbium-doped optical amplifiers (EDFA) Raman Amplifiers Semiconductor optical amplifiers (SOA) 5
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Photonic Network By Dr. M H Zaidi Electro Optical Amplifiers Optical signal is: Received and transformed to an electronic signal Amplified in electronic domain Converted back into optical signal at same wavelength 6
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Photonic Network By Dr. M H Zaidi Erbium-doped Fiber Amplifier (EDFA) An erbium-doped fiber amplifier consists of: A length of silica fiber, whose core is doped with rare earth element erbium. A pump laser of 980 nm or 1480 nm.
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This note was uploaded on 06/03/2011 for the course IT ISE808 taught by Professor Mr.tayyab during the Spring '11 term at College of E&ME, NUST.

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Optical Ampifier and Detector(03-03-2011) - Optical...

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