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MULTIPLEXING TECHNIQUE FOR FOS (Types of multiplexing schemes (Time…
MULTIPLEXING TECHNIQUE FOR FOS
Importance of multiplexing
More than one sensors
identify the signals from different sensors
A unique feature of FO sensing
Capability of multiplexing & distributed sensing
Types of multiplexing schemes
Time division multiplexing (TDM)
Each sensor allocated a certain time interval
Has its own delay line
Frequency-division multiplexing (FDM)
Wavelength-division multiplexing (WDM)
Each sensor allocated a certain wavelength range
Each sensor has its own detector
Coherence multiplexing (CM)
Each sensor is associated with a certain delay loop
Has its own matching detector loop
Spatial multiplexing (SM)
Simplest multiplexing method
Each sensor has its own separate fiber line
Code-division multiplexing (CDM)
Design of a sensor network
For identification of signals from different sensors which will determine the system topology
Detection of the identified signals whcih requires power budgeting data of the system / relevant noise of the system
Sensor Network Topologies
Bus Topology
Utilize the reflective sensors, there is a common line for the interrogating light from the source to the sensors
Transmissive sensors are used tor the incoming and the return lines are common to all sensors
Ring Topology
Tapping mehanism at each sensor
Equal amount of power maybe distributed to each sensors
Star Topology
Each sensor has its own optical lines
A uniform coupling ratio, the power per sensor balanced
Network Power Budgetting
Available components on the market
Standard procedure in telecomm
Bandwidth-link length product classification
BL Classification :
Basic Sensor Requirement
A wind speed ad direction sensor
Seven sensors for detecting four level of dust concentration
Seven sensors for detect carbon monoxide
UMMI SHOBIRAH BINTI ALI
