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7/30/2019 Power Calculation 10g
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Prithvi Information Solution Ltd.
OptiX BWS 1600G
Optical power
Calculation
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Objectives
Upon completion of this course, you will be
able to :--
Grasp the Optical Power Calculation.
Grasp the common indices on Optical Power Calculation.
Grasp the relation of each Reference Point on the
Equipments.
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Chapter 1 Common Terms Used
Chapter 2 Power Calculation of OSC
Chapter 3 Power Calculation Traffic Channel
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Common Terms Insertion Loss
Gain
Receiver Sensitivity Overload power
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Insertion loss
Insertion loss is the decrease in transmitted signal power resulting from
the insertion of a device in a transmission line or optical fiber. It is
usually expressed relative to the signal power delivered to that same
part before insertion. Insertion loss is usually expressed in decibels
(dB).
Insertion loss=Pin /Pout
In an optical fiber system, insertion loss is introduced by things such as
connectors, splices, and coupler
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Receiver Sensitivity
Sensitivity in a receiver is normally taken as
the minimum input signal (Smin) required to
produce a specified output signal.
For example
A receive sensitivity of -78 dBm is better than a receive sensitivity of
-75 dBm by 3 dB, or a factor of two. In other words, at a specified data
rate, a receiver with a -78 dBm sensitivity can hear signals that are half
as weak as a receiver with a -75 dBm receive sensitivity.
http://en.wikipedia.org/wiki/DBmhttp://en.wikipedia.org/wiki/DBm7/30/2019 Power Calculation 10g
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Overload Power
Overload power of a receiver module may be
defined as Maximum power with which a card
can be withstand and work with its full
functionality.
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Specification of Optical Amplifier
Types of OA
Total Input Power
(dBm)
Single Channel Input
Power (dBm) Gain(dB)
OPU
-32 ~ -8 -24
23
OAU -32 ~ -4 -20 20 ~ 31
OBU03 -24~ -3 -19 21 ~ 25
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Specification of OTU
OTU Types Receiver
Sensitivity
(dBm)
Overload power
(dBm)
Mean launch
Power
(dBm)
LWF DWDM Side -18 -9 +1 ~ -5Client Side -14 -1 +2 ~ -1
TMX DWDM Side -18 -9 +1 ~ -5
Client Side -28 -9 +3 ~ -2
LWF(WAN) DWDM Side -18 -9 +1 ~ -5
Client Side -12.6 0.5 +0.5 ~ -8.2
LOG DWDM Side -18 -9 +1 ~ -5
Client Side -19 -3 -3 ~ -11
LWC1 DWDM Side -18 -9 +1 ~ -5
Client Side < -28 -9 -2 ~+3
FDGS DWDM Side -18 -9 +1 ~ -5
Client Side < -21 -3 +5 ~ -2
Insertion loss of M40 in dB is 2 to7
Insertion loss of D40 dB is 2 to 7Insertion loss of FIU in dB is 1
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OPTICAL TERMINAL MULTIPLEXER CONNECTION
DIAGRAM (10G)
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POWER CALCULATION STEPS AT OTM
1. Figure in previous slide shows the fiber connection on OTM.
2. Check if the fiber connection between boards is correct based on the
fiber connection diagram and if the fiber on each board is well inserted.
If not, correct the error immediately.
3. Make the client sides of all OTUs access signals in either of the
following two ways:4. The OTU optical power commissioning requirements that the input
optical power of the client-side RX should be within the Dynamic range
If the measured input optical power of the RX is not within Dynamic
range than attenuation by fixed attenuators can be added to meet the
specified optical power .
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POWER CALCULATION STEPS AT OTM
6. Test the output optical power of the OUT interface on the OTU. The value
should be within the range from +1 dBm to 5 dBm and is 2 dBm
normally.
7. Test the receiving optical power of the Mn interface of the M40 and
record the value.
8. Standard per-channel input power = Maximum input optical power
10lgN, where N is the maximum number of wavelengths.9. Now we have to set the input power for through manual VOA provided at
the input of OBU as -3dBm ( For 40ch.).
10. Attenuation of the variable attenuator = Input optical power of the IN
interface on the OBU Output optical power of the OUT interface on the
M40.
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POWER CALCULATION STEPS AT OTM
13. On the other end the input for OPU is adjusted through EMS/LCT with
electronic VOA provided at the input of OPU as -8(For 40CH)
14. RC-OUT insertion loss on the FIU = Input optical power of the RC on the
FIU Optical power of the OUT on the FIU
15. Test the optical power of the OUT interface on the FIU when RM isdisconnected. For the insertion loss requirement, refer to the OptiX BWS
1600G Backbone DWDM Optical Transmission System Technical
Description.
16. Test the optical power of the TM interface on the SC1 and the RM
interface on the FIU, and calculate the RM-OUT insertion loss.17. RM-OUT insertion loss on the FIU = Optical power of the RM on the FIU
Optical power of the OUT on the FIU (disconnect RC interface)
POWER CALCULATION STEPS AT OADM
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POWER CALCULATION STEPS AT OADM
SITE(10G)
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POWER CALCULATION STEPS AT OADM
SITE(10G)
1. Figure on previous slide shows the fiber connection on OADM
site.
2. Check if the fiber connection between boards is correct based
on the fiber connection diagram and if the fiber on each board
is well inserted. If not, correct the error immediately.
3. Perform the commissioning on the west OPU by setting theattenuation with help of electronic VOA provided at the input
of OPU through LCT/EMS for specified power levels ( -8 dBm
for 40ch.dBm)
4. Test the receiving optical power of the IN interfaces of all west
OTUs respectively and record all the values.
5. Connect the optical power meter to the IN interface of the OTU
with the largest optical power.
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POWER CALCULATION STEPS AT
OADM SITE(10G)
6. After the commissioning of the west receiving optical amplifier is
complete, adjust the manual variable attenuator(A-11) between the
west OPU and the MR2. Make the input optical power of the IN
interface on the west OTU that has the highest receiving optical
power reach 6 dBm, to ensure that the input optical power of the IN
interfaces on all the west OTUs is within the range from 6 dBm to 8
dBm.
7. Test the optical power of the IN interface on the first west D40and
calculate the insertion loss of the attenuator.
8. Insertion loss of the attenuator = Output optical power of the
receiving optical amplifier OPU Input optical power of the IN
interface on the D40.
9. Repeat Steps 3 to 6 to complete the commissioning on the second
west D40 .
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10.Use a Power meter to test the input optical power of the east OBU.Adjust the variable attenuator between the west MR2 and the east
MR2(A-9), to make the average input optical power of the OBU as
- 3 (FOR 40 CH.)
10.Use a Power meter to test the input optical power of the adding
wavelengths of east M40.Adjust the variable attenuator of each
wavelength conversion board and make the input optical power of the
wavelength on the east M40 reach the standard value (-18dBm).
11.Repeat the same procedure to adjust the power levels of other
direction.
POWER CALCULATION STEPS AT
OADM SITE(10G)
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OPTICAL POWER LEVELS IN OADM
FOR 16 LAMBDA SYSTEM
MEASUREMENT POINT POWER LEVEL(dBm)
IN POINT AT OBU - 7
IN POINT AT OPU - 12
A01,A02 OF MR2 -18
IN ITERFACE OF EACH OTU - 6 TO 8
OUT POINT AT OBU 16
OUT POINT AT OPU 11
FOR 32 LAMBDA SYSTEM
MEASUREMENT POINT POWER LEVEL(dBm)
IN POINT AT OBU - 4
IN POINT AT OPU - 9
A01,A02 OF MR2 -18
IN ITERFACE OF EACH OTU - 6 TO
8
OUT POINT AT OBU 19
OUT POINT AT OPU 14
FOR 40 LAMBDA SYSTEM
MEASUREMENT POINT POWER LEVEL(dBm)
IN POINT AT OBU - 3
IN POINT AT OAU - 4
A01,A02 OF MR2 -18
IN ITERFACE OF EACH OTU - 6 TO 8
OUT POINT AT OBU 20
OUT POINT AT OAU 17
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