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Chapter 8: Multiplexing Techniques for Fiber Optics System Part 1 (Types…
Chapter 8: Multiplexing Techniques for Fiber Optics System Part 1
Importance of multiplexing
A unique feature for FO sensing
Capability of multiplexing and distributed sensing
To identify signal from different sensor
More than one sensors
Types of multiplexing scheme
Wavelength-Division Multiplexing (WDM)
Basic setup
Each sensor is allocated with a certain wavelength and its own detector
Strength: Good power per sensing ratio
Weakness: May require special designed components
Coherence multiplexing (CM)
Basic setup
Each sensor is associated with a certain delay loop and its own matching detector
Strength: Use in interferometric method
Weakness:Problem in matching sensing & detecting arms
Others
Frequency-Division Multiplexing (FDM)
Code-Division Multiplexing (CDM)
Time-Division Multiplexing (TDM)
Basic setup
Each sensor allocated a certain time interval
Each sensor has its own delay line
Weakness: Require fast electronics
Spatial Multiplexing (SM)
Basic setup
Simplest multiplexing & each sensor has its own separate line
Strength: Simple implementation
Weakness: May requires abundant of bundle of fibers & detector
Sensor network topologies
Ring Topology
Basic setup
'Tapping' mechanism at each sensor
Equal amount of power is distributed to each sensor
Bus topology
Basic setup
Utilize reflective sensors
Integorrating light from source to the sensors
Star Topology
Basic setup
Explaination
Each sensor has its own optical lines
Power per sensor is balanced
