Please enable JavaScript.
Coggle requires JavaScript to display documents.
TOPIC 5 FIBER OPTIC SYSTEM DESIGN (FIBER OPTIC SYSTEM DESIGN (b) TYPES…
TOPIC 5
FIBER OPTIC
SYSTEM DESIGN
TRANSMISSION LOSSES IN THE
FIBER OPTIC CABLES
TYPE OF TRANSMISSON
LOSSES
1) ABSORPTION LOSSES
Intrinsic
for instrinsic absorption
use ultra-pure glass and dopant chemicals to minimize impurities
having a clean fiber during connection can also minimize absorption loss.
Extrinsic
For extrinsic absorption
By glass refining techniques such as vapor-phase oxidation during the process of fiber manufacturing which largely eliminates the effects of these metallic impurities
2) RAYLEIGH SCATTERING
LOSSES
Scattering loss are caused by the interaction of light with density fluctuations within a fiber
Light travelling through the fiber interacts with the density areas, then partially scattered in all directions as it travels down the fiber.
3) DISPERSION
2) CHROMATIC DISPERSION
Is a pulse spreading due to the fact that fibers transmit light of different wavelength through different materials at different speeds.
1) MODAL DISPERSION
Modal dispersion is defined as pulse spreading caused by the time delay between lower-order modes (modes or rayspropagating straight through the fiber close to the optical axis)and higher-order modes (modes propagating at steeper angles).
3) POLARIZATION MODE DISPERSION
Different polarization light travel at different speeds, if the fiber is not perfectly symmetric at the automic level.
INSERTION AND RETURN LOSS
IN FIBER OPTIC COMMUNICATION
SYSTEM
INSERTION LOSS is the most important performance indicator of a fiber optic interconnection
CONNECTOR LOSSES
SPLICING LOSSES
COUPLING LOSSES
DIAMETER CORE MISMATCH
LONGITUDINAL MISALIGNMENT
LATERAL MISALIGNMENT
ANGULAR MISALIGNMENT
FIBER END ROUGH / IRREGULAR
RETURN LOSS is the loss of power in the signal returned/reflected by a discontinuty in a transmission line or optical fiber
DECIBEL, dBW AND dBM IN
POWER MEASUREMENT
DECIBEL IS A LOGARITHMIC UNIT USED TO EXPRESS THE RATIO OF TWO VALUES OF A PHYSICAL QUANTITY, OFTEN POWER OR INTENSITY
dBW IS A UNIT FOR THE MEASUREMENT OF THE STRENGTH OF A SIGNAL EXPRESSED IN DECIBELS RELATIVE TO ONE WATT ![dBm W mW dBW Tables]
e.g., 10 dBm (10 mW) is equal to −20 dBW (0.01 W). ![13057]
dBM IS AN ABBREVIATION FOR THE POWER RATIO IN DECIBELS (dB) OF THE MEASURED POWER REFERENCED TO ONE MILLIWATT (mW) ![decibel-chart-dBm]
FIBER OPTIC
SYSTEM DESIGN
a) Transmission Distances
b) TYPES OF FIBER OPTICS
SMF/MMF
Fiber type–SMF28
cable loss
Spool length
c)INFORMATION CAPABILITIES
d) TRANSFER MODE
Multimode LEDs
Single mode LaserDiodes
e) SYSTEM ARCHITECTURE
NETWORK MESH
NETWORK RING
f) OperationalWavelength
h)Number of Connectors and Splices i)Connection: No. of splice, Splice loss No. of connectors, Connector Loss
ii)In Line Devices: Splitter, Filter, Attenuator, Amplifier, Insertion loss,Gain
g) RECEIVER SENSITIVITY
OPTICAL LINK BUDGET
THE LINK POWER BUDGET DETERMINES THE AMOUNT OF TOTAL LOSS DUE TO ATTENUATION AND OTHER FACTORS THAT CAN BE INTRODUCED BETWEEN THE TRANSMITTER AND THE RECEIVER AND IS USUALLY SPECIFIED OR EXPRESSED IN DECIBELS (dB)
THE LINK POWER BUDGET IS CALCULATED BY TAKING THE DIFFERENCE BETWEEN THE MINIMUM TRANSMITTER POWER LAUNCHED INTO THE FIBER, AND THE MINIMUM RECEIVER SENSITIVITY FOR A GIVEN BER
POWER LINK BUDGET
ATTENUATION AND BANDWIDTH ARE THE
KEY PARAMETERS FOR BUDGETS LOSS
ANALYSIS, BUT SINCE WE CANNOT TEST ATTENUATION, WE GENERALLY USE LIMITS FOR LOSS
SET BY THE STANDARDS FOR THE SYSTEMS OR
NETWORKS WE ARE GOING TO USE ON THE LINKi
RISE TIME OR BANDWIDTH
BUDGET
THE PURPOSE OF RISE-TIME BUDGET IS TO ENSURE THAT THE SYSTEM IS ABLE TO OPERATE PROPERLY AT THE INTENDED BIT RATE
Absorption loss is defined as portion of attenuation resulting from the conversion of optical power into another energy form such as heat
Is caused by the basic fiber material properties due to material and electron absorption
Is caused by unwanted particles or impurities such as iron, nikel, chromium optical fibers
CLASS: DEP4B
NAMA PENSYARAH:
EN. ARIFFUDDIN BIN IBRAHIM
NAMA AHLI KUMPULAN:
1) PUTERI FARHANA NABILA BT TUAN MOHD PUA'AD
14DEP17F1035
2) SHAHRIZZATUL AMIRA BINTI MOHD AZMAN
14DEP17F1031
3)NUR BALQIS BINTI SHAHRIPUDDIN
14DEP17F1025
4)MAHENDRAN A/L MURUGAN
14DEP17F1029
5)MUHD SYAZWAN SAIFUDDIN BIN SALLEHUDDIN
14DEP17F1027
INTERAKTIF
INTERAKTIF
