Design Parameters For Feasibility Results
Link Power Budget [10]
Link power budget is calculated as the requirement that the link we exceed its design limit threshold of the power needed. To calculate the power link budget can be calculated by the formula:
Form of equations for the calculation of the power margin is:
Description:
Pt = optical output power source (dBm)
Pr = maximum power detector sensitivity (dBm)
SM = Safety margin, ranging from 6-8 dB
α tot = total system attenuation (dB)
L = length of optical fiber (Km)
α c = damping connector (dB / fruit)
α s = Damping connection (dB / connection)
α = attenuation fiber optic fiber (dB / km)
Ns = Number of connections
Nc = Number of connectors
Sp = Damping Splitter (dB)
Required power margin must have a value greater than 0 (zero), the power margin is the remaining power of the transmit power of the net loss during the transmission process, the reduction of the value of the safety margin and a reduction in the value of receiver sensitivity.
Rise Time Budget [1]
Rise time budget is a method to determine the limits of the dispersion of a fiber optic link. This method is very useful for analyzing digital transmission systems. The purpose of this method is to analyze whether the overall network performance has been achieved and is able to meet the desired channel capacity. Generally, the total degradation time of transition from digital link does not exceed 70 percent of the bit period NRZ (non-retum-to-zero) or 35 percent of the period for data bits RZ (return-to-zero). One bit period is defined as the reciprocal of the data rate. To calculate the Rise Time budget can be calculated by the formula:
Description:
transmitter ttx = Rise time (ns)
TRX receiver = Rise time (ns)
tintermodal = zero (for a single mode optical fiber)
tintramodal = tmaterial + twaveguide
tmaterial = Δσ x L x Dm
twaveguide = tw = L [n2 + n2Δ (vb)]
C dv
Δσ = Spectral width (nm)
L = length of optical fiber (Km)
Dm = Material Dispersion (ps / nm.Km)
N2 = refractive index sheath
c = velocity of light 3x108
v = 2π x A x n1 x (2 x Δs) 1/2
λ
a = radius of the nucleus
n1 = refractive index of the core
n2 = refractive index sheath
Link Power Budget [10]
Link power budget is calculated as the requirement that the link we exceed its design limit threshold of the power needed. To calculate the power link budget can be calculated by the formula:
Form of equations for the calculation of the power margin is:
Description:
Pt = optical output power source (dBm)
Pr = maximum power detector sensitivity (dBm)
SM = Safety margin, ranging from 6-8 dB
α tot = total system attenuation (dB)
L = length of optical fiber (Km)
α c = damping connector (dB / fruit)
α s = Damping connection (dB / connection)
α = attenuation fiber optic fiber (dB / km)
Ns = Number of connections
Nc = Number of connectors
Sp = Damping Splitter (dB)
Required power margin must have a value greater than 0 (zero), the power margin is the remaining power of the transmit power of the net loss during the transmission process, the reduction of the value of the safety margin and a reduction in the value of receiver sensitivity.
Rise Time Budget [1]
Rise time budget is a method to determine the limits of the dispersion of a fiber optic link. This method is very useful for analyzing digital transmission systems. The purpose of this method is to analyze whether the overall network performance has been achieved and is able to meet the desired channel capacity. Generally, the total degradation time of transition from digital link does not exceed 70 percent of the bit period NRZ (non-retum-to-zero) or 35 percent of the period for data bits RZ (return-to-zero). One bit period is defined as the reciprocal of the data rate. To calculate the Rise Time budget can be calculated by the formula:
transmitter ttx = Rise time (ns)
TRX receiver = Rise time (ns)
tintermodal = zero (for a single mode optical fiber)
tintramodal = tmaterial + twaveguide
tmaterial = Δσ x L x Dm
twaveguide = tw = L [n2 + n2Δ (vb)]
C dv
Δσ = Spectral width (nm)
L = length of optical fiber (Km)
Dm = Material Dispersion (ps / nm.Km)
N2 = refractive index sheath
c = velocity of light 3x108
v = 2π x A x n1 x (2 x Δs) 1/2
λ
a = radius of the nucleus
n1 = refractive index of the core
n2 = refractive index sheath
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