A 10 GB/s system has shot noise of 50nW, thermal (Johnson) noise of 50nW, and relative intensity noise of 10nW when received by a photoreceiver after ~100km of travel. The launch power is 1mW and the received power is 1uW. (a) Find the total noise power and signal-to-noise ratio. (b) Suppose , instead of being received, the signal goes through an amplifier with a noise figure of 4dB which brings the signal power back to 1mW, is transmitted through another 100km, and then received. Find the total noise power and signal to-noise ratio. (Recall some of these noise sources are associated with the receiver and so will not be affected by the strictly-optical amplifier. So the signal to noise ratio before the amplifier only includes the RIN noise)

A 10 GB/s system has shot noise of 50nW, thermal (Johnson) noise of 50nW, and relative intensity noise of 10nW when received by a photoreceiver after ~100km of travel. The launch power is 1mW and the received power is 1uW. (a) Find the total noise power and signal-to-noise ratio. (b) Suppose , instead of being received, the signal goes through an amplifier with a noise figure of 4dB which brings the signal power back to 1mW, is transmitted through another 100km, and then received. Find the total noise power and signal to-noise ratio. (Recall some of these noise sources are associated with the receiver and so will not be affected by the strictly-optical amplifier. So the signal to noise ratio before the amplifier only includes the RIN noise)

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

A 10 GB/s system has shot noise of 50nW, thermal
(Johnson) noise of 50nW,
and relative intensity noise of 10nW when
received by a photoreceiver after ~100km of
travel. The launch power is 1mW and the received
power is 1uW.
(a) Find the total noise power and signal-to-noise
ratio.
(b) Suppose , instead of being received, the signal
goes through an amplifier with a
noise figure of 4dB which brings the signal power
back to 1mW, is transmitted
through another 100km, and then received. Find
the total noise power and signal to-noise ratio.
(Recall some of these noise sources are associated
with the receiver and so will not be affected by the
strictly-optical amplifier. So the signal
to noise ratio before the amplifier only includes
the RIN noise)

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