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TOPIC 5 (5.7 Power Link and Rise Time Budget (a. Power Link Budget (PB :…

- - - - Types Of Transmission
        Loss
        
        Absorption
        Losses
        
        Intrinsic
        
        Extrinsic
        
        Rayleigh Scattering
        Losses
        
        graph of attenuation vs wavelength
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        light scattered during transmission
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        rayleigh scattering in an optical fiber
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        Dispersion
        
        a. Modal Dispersion
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        C. Polarization Mode Dispersion
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        b. Chromatic Dispersion
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- - - - common causes:
        i. misalignment of ferrules
        during connection
        ii. air gap between two
        mating ferrules
        iii. absorption loss
      - result of losses:
        • signal will loss
        • integrity data will
        damaged
        • stability become
        lower
      - Return Loss → loss power in signal
        returned/reflected by
        discontinuity
        RL(dB)=10log^10 Pi/Pr
        
        Insertion Loss(IL)
        
        CONNECTOR LOSS
        
        SPLICING LOSSES
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        COUPLING LOSSES
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- - - - How to convert dBW to dBm
        P(dBm) = P(dBW) + 30
        
        How to convert dBm to dBW
        P(dBW) = P(dBm) – 30
- - - - The decibel watt or dBW is a unit for the measurement of the
        strength of a signal expressed in decibels relative to one watt.
        
        FORMULAR dBW
        Power in dBW = 10 log10 (Power / 1 W)
        
        dBm (sometimes dBmW or decibel-milliwatts) is an abbreviation
        for the power ratio in decibels (dB) of the measured power
        referenced to one milliwatt (mW).
        
        FORMULAR dBm
        PdBm = 10 log P
        /1 mW
- - - - Information Capabilities
        NRZ and RZ coding
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        Transfer Mode / Source type
        LED- multimode
        LASER- Single Mode
        
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        Detector type
        PIN photodiode or APD photodiode
        
        System architecture
        
        Link (point-to-point)
        
        Network
        
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        Operational Wavelength
        MM- 850nm, 1300nm and SM typically
        
        Receiver Sensitivity
        minimum average received optical power Pmin required to achieved a fixed BER.
        BER- probability of an incorrent identification of a bit by th dicision circuit of a receiver
        Perfomance- measured as a low bit error rate (BER)
        
        1 more item...
        
        mesh
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        RING
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        point to multipoint
- - - - PRX = PTX – Total Losses + Total Gain - PMARGIN
        PRx = PTx - PL +
        
        Total Loss, L = LIL + Lfiber + Lconn. + Lnon-line
        
        Gain, G = Gainamp + Gnon-line
  - - - Tfiber = D x
        
        Total Rise time, Tsys : tsys
        = 1.1 X TTx
        2+TRx
        2+ Tfiber