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/DBm


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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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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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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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SITE(10G)


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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



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



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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Power Calculation 10g

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