Chapter: Optical Communication and Networking : Fiber Optic Receiver and Measurements

Quantum Limit

An ideal photodetector which has unity quantum efficiency and which produces no dark current, that is no electron holde pairs are generated in the absence of an optical pulse.

QUANTUM LIMIT

 

·           An ideal photodetector which has unity quantum efficiency and which produces no dark current, that is no electron holde pairs are generated in the absence of an optical pulse.

 

QUANTUM LIMIT

 

·           This condition, it is possible to find the minimum received optical power required for a specific nit error rate performance in a digital syatem. This minimum received power level is known as the quantum limit.

 

·           Assume an optical pulse of energy E falls on the photodeetector in a time interval t. This can only be interpreted by the receiver as a 0 pulse if no electron hole pairs are generated with the pulse with the pulse present.

 

·           The probability that n=0 electrons are emitted in a time interval t is


·           Thus for a given probability Pr(o), we can find the minimum energy E required at a specific wavelength l.

 

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Optical Communication and Networking : Fiber Optic Receiver and Measurements : Quantum Limit |


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