The simulation layout is shown in Fig. 3 consist of WDM transmitter system is connected to ideal mux then the output of the mux is fed into the EDFA and the output is measured in optical power meter and optical spectrum analyzer and the gain enhancement is displayed in dual port analyzer.
In this design table.3 the wavelength value starting from 1558.0 nm and slicing into 16channels every chip slicing is 0.8nm. so, the distributed is illustrated as the following table.3 If frequency increases, gain increases and noise decreases in the above- mentioned table Output Power at +23.5dBmWhich is shown in Fig.4.The input power is changing from +23.5 to +25.5, the gain and noise figure is measured in the table 3, Output signal and noise power variation at +23.5dBm which is shown in Fig.5. Results shows that the gain, noise and output power is measured by varying the pump power and length of the fiber with the same input power of +23.3dBm using optimized erbium doped fiber of 5m length.The parameters evaluation in terms of max gain and max power are also made considering three pump powers at 200mW, 300mW&400mW and length of the fiber is varied from 6m,7m and 8m at +23.3dBm and the power at 200mW and both length and pump power is varied at + 23.3dBm. Figure 6 shows the Output Power at + 25.5dBm and Fig. 7 represents the Output signal and noise power variation at + 25.5dBm
Table 4
Gain and power values at different Pump Power and fixed input power of + 23.3dBm and the length is 5m
Parameter
|
PumpPower
|
200mW
|
300mW
|
400mW
|
MaxGain
|
0.31
|
0.38
|
0.45
|
MaxPower
|
32.9
|
33.07
|
33.15
|
Table 5
Gain and power values of different fiber length and fixed input power of + 23.3dBm and the pump power at 200mW
Parameter
|
FiberLength
|
6m
|
7m
|
8m
|
MaxGain
|
0.36
|
0.40
|
0.48
|
MaxPower
|
32.005
|
33.018
|
34.013
|
Table 6
Gain and power values at different fiber length and pump power and fixed input power at + 23.3dBm
Parameter
|
LengthandPumpPower
|
5m and200mW
|
6m and300mW
|
7m and400mW
|
MaxGain
|
0.31
|
0.44
|
0.57
|
MaxPower
|
32.9
|
33.09
|
33.2
|
In first case, pump power is varied from 200mW to 400mW with the same input signal power at 23.3dBm and the fiber length is about 5m which is mentioned by Table
4. In another case Table .5, fiber length is varied from 6m to 8m with the same input power at + 23.3dBm and the pump power is fixed about 200mW and then both pump power and length of the fiber is varied with fixed input power at + 23.3dBm in table .6. In these all cases, gain is enhanced and the noise is decreases and the output power is also increasing.The input signal is modulated with semiconductor laser that is represented by continuous wave laser frequency 193.1 THz through Mach-Zehnder modulator. CW laser to generate optical signals supplies input signal with 193.1THz frequency and input power of 25dBm which is externally modulated at 10Gb/s, with a NRZ and RZ pseudo random binary sequence in a Mach- Zehnder modulator with 30 dB of extinction ratio. With laser as the optical source, the performance of various FSO parameters is analyzed.
Range = 10km
Transmitter aperture diameter = 15cm
Receiver aperture diameter = 20cm
Data rate = 10Gb/s
NRZ Outputs
(i) Beam divergence at 0.3mrad
Figure 8 shows that the NRZ outputs for diverse light parameters. In case (i) beam divergence is considered as one of the parameter with a value of 0.3mrad, as a result of this NRZ outputs are measured such as BER, Quality factor and Power.
-
BER = 1.82e-027
-
Q-factor = 10.75
-
Power = -16.1dBm
(ii)Beam divergence at 0.6 mrad
Figure 9 shows that the NRZ output with the modified beam divergence (Case ii) value of 0.6mrad. As a result of this, the NRZ outputs gets varied like BER, Quality factor and Power level of the FSO with respect to the beam divergence.
-
BER = 8.67e-027
-
Q-factor = 10.61
-
Power = -22.1dBm
(iii)Beam divergence at 0.9mrad
Figure 10 shows that the NRZ output with the modified beam divergence (Case iii) value of 0.9mrad. As a result of this, the NRZ outputs gets varied like BER, Quality factor and Power level of the FSO with respect to the beam divergence.
-
BER = 1.65e-023
-
Q-factor = 9.88
-
Power= -25.5dBm
(iv)Beam divergence at 1.2mrad
Figure 11 shows that the NRZ output with the modified beam divergence (Case iv) value of 1.2mrad. As a result of this, the NRZ outputs gets varied like BER, Quality factor and Power level of the FSO with respect to the beam divergence.
-
BER = 3.95e-020
-
Q-factor = 9.07
-
Power = -28.0dBm
(v)Beam Divergence at 2mrad
Figure 12 shows that the NRZ output with the modified beam divergence (Case v) value of 2mrad. As a result of this, the NRZ outputs gets varied like BER, Quality factor and Power level of the FSO with respect to the beam divergence.
-
BER = 1.67e-012
-
Q-factor = 6.92
-
Power= -32.4dBm
(vi)Beam Divergence at 3mrad
Figure 13 shows that the NRZ output with the modified beam divergence (Case vi) value of 2mrad. As a result of this, the NRZ outputs gets varied like BER, Quality factor and Power level of the FSO with respect to the beam divergence.
-
BER = 4.54e-007
-
Q-factor = 4.87
-
Power= -36.0dBm
RZ Outputs
(i)Beam Divergence at 0.3mrad
Figure 14 shows that the RZ output with the modified beam divergence (Case i) value of 0.3mrad. As a result of this, the RZ outputs gets varied like BER, Quality factor and Power level of the FSO with respect to the beam divergence.
-
BER = 1.09e-17
-
Q-factor = 27.80
-
Power= -22.9dBm
(ii)Beam Divergence at 0.6mrad
Figure 15 shows that the RZ output with the modified beam divergence (Case ii) value of 0.6mrad. As a result of this, the RZ outputs gets varied like BER, Quality factor and Power level of the FSO with respect to the beam divergence.
-
BER = 2.20e-060
-
Q-factor = 16.32
-
Power= -28.9dBm
(iii) Beam divergence at 0.9mrad
Figure 16 shows that the RZ output with the modified beam divergence (Case iii) value of 0.9mrad. As a result of this, the RZ outputs gets varied like BER, Quality factor and Power level of the FSO with respect to the beam divergence.
-
BER = 5.19e-028
-
Q-factor = 10.88
-
Power= -32.4dBm
(iv) Beam divergence at 1.2 mrad
Figure 17 shows that the RZ output with the modified beam divergence (Case iv) value of 1.2mrad. As a result of this, the RZ outputs gets varied like BER, Quality factor and Power level of the FSO with respect to the beam divergence.
-
BER = 9.13e-016
-
Q-factor = 7.92
-
Power= -34.8dBm
(v)Beam divergence at 2mrad
Figure 18 shows that the RZ output with the modified beam divergence (Case v) value of 2mrad. As a result of this, the RZ outputs gets varied like BER, Quality factor and Power level of the FSO with respect to the beam divergence.
-
BER = 1.67e-005
-
Q-factor = 4.11
-
Power= -39.3dBm
(vi)Beam divergence at 3mrad
Figure 19 shows that the RZ output with the modified beam divergence (Case vi) value of 2mrad. As a result of this, the RZ outputs gets varied like BER, Quality factor and Power level of the FSO with respect to the beam divergence.
-
BER = 0.0143
-
Q-factor = 2.16
-
Power= -42.8dBm
With increase in beam divergence the beam directivity is reduced so that bit error rate increases and decrease in Quality factor and received power. From the above simulation results, concluded that when beam divergence is increases from 0.3 to 3mrad, the Quality factor decreases and the bit error rate increases and the received power is also decreases. If the bit error rate increases, there is a closure of eye diagram. With increase in beam divergence the beam directivity is reduced, so that the Bit Error rate increases and there is decrease in the Quality factor and the received power.
Range = 10km
Transmitter aperture diameter = 15cm
Receiver aperture diameter = 20cm
Data rate = 10Gb/s.
Weather condition outputs (NRZ)
(i) Ideal (0)
Figure 20 shows that the NRZ output with the (Case i) beam divergence at perfect atmospheric conditions. As a result of this, the NRZ outputs gets varied like BER, Quality factor and Power level of the FSO with respect to the beam divergence.
-
BER = 6.54e-032
-
Q-factor = 11.66
-
Power = 15.65dBm
(ii) Clear air (0.6)
Figure 21 shows that the NRZ output for the (Case ii) beam divergence at clear air with a value of 0.6. As a result of this, the NRZ outputs gets varied like BER, Quality factor and Power level of the FSO with respect to the beam divergence.
-
BER = 7.30e-032
-
Q-factor = 11.65
-
Power = 9.65dBm
(iii) Very light mist (3.1)
Figure 22 shows that the NRZ output for the (Case iii) beam divergence at very light mist with a value of 3.1. As a result of this, the NRZ outputs gets varied like BER, Quality factor and Power level of the FSO with respect to the beam divergence.
-
BER = 6.85e-030
-
Q-factor = 11.26
-
Power= -15.34dBm
(iv)Light mist (4.6)
Figure 23 shows that the NRZ output for the (Case iv) beam divergence at light mist with a value of 4.6. As a result of this, the NRZ outputs gets varied like BER, Quality factor and Power level of the FSO with respect to the beam divergence.
-
BER = 2.43e-016
-
Q-factor = 8.07
-
Power= -30.34dBm
Weather condition outputs (RZ)
(i)Ideal (0)
Figure 24 shows that the RZ output with the (Case i) beam divergence at perfect atmospheric conditions. As a result of this, the RZ outputs gets varied like BER, Quality factor and Power level of the FSO with respect to the beam divergence.
-
BER = 0
-
Q-factor = 43.73
-
Power = 10.24dBm
(ii)Clear air (0.6)
Figure 25 shows that the RZ output for the (Case ii) beam divergence at clear air with a value of 0.6. As a result of this, the RZ outputs gets varied like BER, Quality factor and Power level of the FSO with respect to the beam divergence.
-
BER = 0
-
Q-factor = 43.55
-
Power = 4.24dBm
(iii)Very light mist (1.2)
Figure 26 shows that the RZ output for the (Case iii) beam divergence at very light mist with a value of 3.1. As a result of this, the RZ outputs gets varied like BER, Quality factor and Power level of the FSO with respect to the beam divergence.
-
BER = 1.670
-
Q-factor = 31.80
-
Power= − 20.75dBm
(iv) Light mist (4.6)
Figure 27 shows that the RZ output for the (Case iv) beam divergence at light mist with a value of 4.6. As a result of this, the RZ outputs gets varied like BER, Quality factor and Power level of the FSO with respect to the beam divergence.
-
BER = 7.83e-013
-
Q-factor = 7.03
-
Power = − 35.75dBm
Due to the effect of climatic weather condition from ideal to light mist there is an increment took part in bit error rate and decrement in Quality factor, received power as well. The obtained simulation results represent weather Conditions outputs for NRZ and RZ which shows that the analysis of Various parameters such as BER, Q-Factor and power. For strong turbulence, NRZ format has a strong component compared with RZ. This is the cause that NRZ format is preferred over RZ format for strong turbulence. For air and very light mist turbulence, RZ format is preferred over NRZ format. Because RZ format shows minimum BER and then Quality factor is increased and the power is also increasing. so, for air and very light mist RZ format is suitable when compared to NRZ format. For light mist weather condition NRZ format gives the minimum BER when compared to RZ format. Because it gives good Quality factor and minimum BER.