WE START OUT BY DERIVING an expression for the statistics of the photocurrent in the *pin* receiver, along the lines of [BL90, RH90]. It is useful to think of the photodetection process in the following way. Each time a photon hits the receiver, the receiver generates a small current pulse. Let *t _{k}* denote the arrival times of photons at the receiver. Then the photocurrent generated can be expressed as

(I.1)

where *e* is the electronic charge and *eh(t* – *t _{k}*) denotes the current impulse due to a photon arriving at time

The arrival ...

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