For System_2, the link budget is also used for calculation and verification of the operating characteristics of an optic

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For System_2, the link budget is also used for calculation andverification of the operating characteristics of an optical fibertransmission link with focus on the Transmit Power, Coupling Loss,Fiber Loss, Component Losses, Receiver Sensitivity and Margins. Thepower budget equation states that the power budget in atransmission link must equal the sum of all power losses plus thepower margin. The power budget is the difference between thetransmitter output power and the receiver sensitivity in dBm. Theequation is thus:
The Receiver Sensitivity of an Optical receiver depends on thebit rate, bit error rate and signal-to-noise characteristics of thereceiver. The fiber attenuation coefficient depends on theoperating wavelength.
PTx – [ ΣLoss +ΣMargins ] ≥ PSR ----- (1)
With the various components counted in the calculation, theequation can be re-written as
PTx – [ ΣLCoupling + ALTF + ΣLConnector + ΣLSplice + ΣLK+ M ] ≥ PSR ----- (2)
where PTx =Transmitter Output Power (dBm)
PSR = ReceiverSensitivity (dBm)
A = Fiber AttenuationCoefficient (dB/km)
LTF = FiberTransmission Length (km)
LC = Coupling Loss(dB)
LConnector =Connector Loss (dB)
LSplice = Splice Loss(dB)
LK = Additional knownlosses (dB)
M = Power Margin(System Margin + Operating Margin) (dB)
Parameter
Symbol
Value
Link Data Rate
R
10 Gbps / 2.5Gbps (NRZ code)
Operating Wavelength
λo
1550nm
Fiber Transmission Length
LTF
To be determined
Transmitter Output Power (Laser output)
PTx
3.291dBm (Max Output=5dBm)
Modulator Loss
LMOD
3dB
Fiber Attenuation Coefficient
A
0.28dB/km
No. of Connector Pair
NConn
2
Connector Loss (per pair) [with pigtailcable]
LConn
0.5dB
No. of Fusion Splices
NS
3
Splice Loss (per splice)
LS
0.25dB (max.)
Coupling Loss (Tx -> Fiber and Fiber -> Receiver)
LC
0.5dB for each end
Margins (System + Operating)
M
4dB
Additional Known Loss
LK
0dB
Receiver Sensitivity [@BER = 1 x 10-9 or Q = 6]
SR
-30dBm
Thermal Noise (@Receiver)
NTH
8.97e-24W/Hz
Please help me to calculate the following information withsteps:
Data Rate
10 Gbps
Fiber Transmission
Length (km)
_____ km
[Pre-simulation calculated
transmission length]
_____ km
[Maximum transmission length by Trial-and-Error method]
_____ km
[80% of the maximum transmission length)
_____ km
[120% of the maximum transmission length]