Ch-7 Optical Fiber Connectors & Optical Amplification

Example 7.42 Page no 496

In [5]:
from __future__ import division
from math import sqrt, pi, log10

# Calculation of a)excess loss,b)insertion loss,c)crosstalk and d)split ratio for the device.

#Given data
P1=60*10**-6#                 # Power launched in port 1
P2=0.004*10**-6#              # Power launched in port 2
P3=26*10**-6#                # Power launched in port 3 
P4=27.5*10**-6#              # Power launched in port 4

# a)Excess loss
E=10*log10(P1/(P3+P4))# 

#b)Insertion loss
I1=10*log10(P1/P3)#
I2=10*log10(P1/P4)#

#c)Crosstalk
C=10*log10(P2/P1)#

#d)Split ratio
S=(P3/(P3+P4))*100#



print"Excess loss = %0.1f dB "%(E)#
print"Insertion loss = %0.2f dB "%(I1)#
print"Insertion loss = %0.2f dB "%(I2)#
print"Crosstalk = %0.1f dB "%(C)#
print"Split ratio = %0.1f %% "%(S)#

Excess loss = 0.5 dB 
Insertion loss = 3.63 dB 
Insertion loss = 3.39 dB 
Crosstalk = -41.8 dB 
Split ratio = 48.6 %

Example 7.43 Page no 497

In [6]:
# Calculation of a)excess loss,b)insertion loss,c)crosstalk and d)split ratio for the device.

#Given data
P1=100*10**-6#                 # Power launched in port 1
P2=0.005*10**-6#              # Power launched in port 2
P3=30*10**-6#                # Power launched in port 3 
P4=35*10**-6#              # Power launched in port 4

# a)Excess loss
E=10*log10(P1/(P3+P4))# 
# b)Insertion loss
I1=10*log10(P1/P3)#
I2=10*log10(P1/P4)#

#c)Crosstalk
C=10*log10(P2/P1)#

#d)Split ratio
S=(P3/(P3+P4))*100#

print"Excess loss = %0.2f dB "%(E)#
print"Insertion loss = %0.3f dB "%(I1)#
print"Insertion loss = %0.2f dB "%(I2)#
print"Crosstalk = %0.1f dB "%(C)#
print"Split ratio = %0.2f %% "%(S)#
# The cross talk answer computation is wrong in the book

Excess loss = 1.87 dB 
Insertion loss = 5.229 dB 
Insertion loss = 4.56 dB 
Crosstalk = -43.0 dB 
Split ratio = 46.15 %

Example 7.44 Page no 498

In [7]:
# Calculation of a)excess loss,b)insertion loss,c)crosstalk and d)split ratio for the device.

#Given data
P1=116.3*10**-6#                 # Power launched in port 1
P2=0.082*10**-6#              # Power launched in port 2
P3=47*10**-6#                # Power launched in port 3 
P4=52*10**-6#              # Power launched in port 4

# a)Excess loss
E=10*log10(P1/(P3+P4))# 
#b)Insertion loss
I1=10*log10(P1/P3)#
I2=10*log10(P1/P4)#

#c)Crosstalk
C=10*log10(P2/P1)#

#d)Split ratio
S=(P3/(P3+P4))*100#

print"Excess loss = %0.1f dB "%(E)#
print"Insertion loss = %0.3f dB "%(I1)#
print"Insertion loss = %0.2f dB "%(I2)#
print"Crosstalk = %0.2f  "%(C)#
print"Split ratio = %0.2f %% "%(S)#
# The answers vary due to round off error

Excess loss = 0.7 dB 
Insertion loss = 3.935 dB 
Insertion loss = 3.50 dB 
Crosstalk = -31.52  
Split ratio = 47.47 %