4. OptiX OSN 380068008800 Optical Power Calculation ISSUE 1.11

7/18/2019 4. OptiX OSN 380068008800 Optical Power Calculation ISSUE 1.11

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Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

OptiX OSN3800/6800/8800 Optical

Power Calculation


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Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved. Page1

Objectives

Upon completion of this course, you will be able to:

Illustrate the relation of each reference point.

List the common indices on optical power calculation.

Calculate the optical power.


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Contents

1. Basics

2. Power Calculation


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Contents

1. Basics

1.1 Basic Concepts


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P (dBm) =10lg

-10dBm = mW

0dBm = mW

10dBm= mW

20dBm = mW

20dBm-10 =10dBm

Units

mW

the unit of optical power

dBm

the unit of optical power

dB

the unit of gain or attenuationof optical power

P(mW)

1(mW)

Calculation

Basic Concept


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Formula

The situation of N wavelengths

Ptotal (dBm)Psingle (dBm) +10lgN(dB)

P1Ptotal

P2

P1=P2=Psingle

Ptotal (mW) P1 (mW) + P2 (mW)

Ptotal (dBm)Psingle (dBm) +10lg2(dB)


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Insertion Loss

The loss of output optical power after the optical signals of

each channel pass through the corresponding channels.

PassivecomponentPoutPin

Insertion Loss (IL) = PinPout

Unit:dB


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Common Indices

Name Insertion Loss Name Insertion Loss

FIU

1 dB (IN-TC, RC-OUT)

MR2

1.5 dB (Add/Drop)

1.5 dB (IN-TM, RM-OUT) 1.0 dB(IN-MRO,MRI-OUT)

MR8

4 dB (Add/Drop)

CMR4

4 dB (Add/Drop)

3.5 dB (IN-MRO,MRI-OUT) 3.5 dB (IN-MRO,MRI-OUT)

MR4

2.2 dB (Add/Drop)

CMR2

1.5 dB (Add/Drop)

1.5 dB (IN-MRO,MRI-OUT) 1.0 dB (IN-MRO,MRI-OUT)


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Common Indices (Cont.)

Note: a. This value can be reached when the VOA is set to minimum.

Name Insertion Loss Name Insertion Loss

RMU9

8.5 dB (EXPI-OUT)

ROAM

9 dB (Mx-OUT)

12.5 dB (AMx-TOA) 7 dB (IN-DM)

1.5 dB (ROA-OUT) 14 dB (EXPI-OUT)

WSD9 8 dB (IN-DMx, IN-EXPO) 3 dB (IN-EXPO)

ITL


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Characteristics of OA

Nominal Input Power

Nominal Output Power

Maximum output power of a single wavelength

Gain

OA

PoutPin

Pout

Gain = Pout (dBm) Pin (dBm)


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Name Nominal inputPower Range

Nominal outputPower

Maximum output power ofa single wavelength Gain range

OBU101 -32-4 dBm 16 dBm 0 dBm 20dB

OBU103 -32 ~ -3 dBm 20 dBm 4 dBm 23dB

OBU104 -32 ~ -1 dBm 16 dBm 0 dBm 17dB

OBU205 -24 ~ 0 dBm 23 dBm 7 dBm 23dB

HBA -19 ~ -3 dBm 26 dBm 10 dBm 29dB

OAU101 -32 ~ 0 dBm 20 dBm 4 dBm 2031dB

OAU102 -32 ~ -3 dBm 17 dBm 1 dBm 2031dB

OAU103 -32 ~ -4 dBm 20 dBm 4 dBm 2436dB

OAU105 -32 ~ 0 dBm 23 dBm 7 dBm 2334dB

CPRCGain 10dB (on G.652 fiber)

Gain 12dB (on G.655 LEAF fiber)

Common Indices (40 Channels)


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Common Indices (80 Channels)

Name Nominal inputPower Range

Nominal outputPower

Maximum output power ofa single wavelength Gain range

OBU101 -32-4 dBm 16 dBm -3 dBm 20dB

OBU103 -32 ~ -3 dBm 20 dBm 1 dBm 23dB

OBU104 -32 ~ -1 dBm 16 dBm -3 dBm 17dB

OBU205 -24 ~ 0 dBm 23 dBm 4 dBm 23dB

OAU101 -32 ~ 0 dBm 20 dBm 1 dBm 2031dB

OAU102 -32 ~ -3 dBm 17 dBm -2 dBm 2031dB

OAU103 -32 ~ -4 dBm 20 dBm 1 dBm 2436dB

OAU105 -32 ~ 0 dBm 23 dBm 4 dBm 2334dB


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Characteristics of OTU

Mean Launch Power

Receiver sensitivity: A

Receiver overload: B

Recommended Receiving Power Range: A+3(dBm) ~ B-

5(dBm)


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Common Indices

NameMean Launch

Power (dBm)

Receiving power RangeRemark

PIN (dBm) APD (dBm)

LSXL / NS3 -5 ~ 0 -16 ~ 0

DWDM

side

LSX / TMX / LOG /

NS2

-3 ~ 2 -16 ~ 0 -26 ~ -9

ND2 / NQ2 -3 ~ 2 -16 ~ 0

L4G -3 ~ 2-2 ~ 2 -25 ~ -9

LDGD / LQMD -8 ~ -4-5 ~ 0 -18 ~ 0 -28 ~ -9

LDGS / LQMS -5 ~ -1, -2 ~ 3 -18 ~ 0 -28 ~ -9


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Questions

What are the units related to optical power?

The conversion between mW and dBm?

If the input power of each channel is -4dBm, whats the value of

input power for 40 wavelengths?


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Contents

1. Basics

2. Power Calculation


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Contents

2. Power calculation

2.1 Power calculation of OSC

2.2 Power calculation of Main Path


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Typical launch power of SC1/SC2: 0 ~ -4dBm

Sensitivity of SC1/SC2: -48dBm

Receiving PowerLaunch Power - Loss of Fiber 2xIL of FIU.

Power Calculation of OSC

TM RM

SC1/2SC1SC1/2SC1

F

I

U

F

I

URM TM

-2dBm

40km(12dB)

IL:1.5dB

-3.5dBm -15.5dBm -17dBm

IL:1.5dB


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Station A Station B

40km(12dB)

The distance between station A and station B: 40km, line attenuation: 12dB.

The same board configuration of station A and station B :

Transmitting end: OBU101.

Receiving end: OAU101.

OTM OTM

Network topology

Power Calculation of Main Path - OTM


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To station B

OTU

M

4

0

M

40 OBU101

F

I

U

Suppose typical launch power of OTU: -2dBm.

Min. insertion loss of VOA : 2dB. IL of M40: 6.5dB.

OBU101 nominal individual channel input/output Power-20/0dBm, typical gain: 20 dB.

IL of FIU:1dB.

VOA

Signal flow and related indices at the transmitting side of stationA



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OTU

M

4

0

M

40

F

I

U

To station B

Typical optical power of the reference points at the transmitting sideof station A Single Channel

-2dBm -20dBm 0dBm -1dBm


OBU101


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M

4

0

M

40

F

I

U

Ptotal (dBm)Psigle (dBm) + 10lgN (dB)

OTU

OTU

-2dBm -20+10lgN 0+10lgN -1+10lgN

To station B

Typical optical power of the reference points at the transmitting sideof station A Multiplex Channels


OBU101


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Station A Station B

The launched optical power of station A : -1+10lgN(dBm).

Attenuation of the line fiber: 12dB.

The receiving optical power of station B: -13+10lgN(dBm).

OTM OTM40km(12dB)

-1+10lgN -13+10lgN


Network topology and the line optical power


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IL of FIU:1dB.

Min. IL of VOA : 2dB.

OAU101 nominal individual channel input/output Power -16/4dBm, typical gain: 20 dB.

IL of D40: 6.5dB.

Typical receiving optical power of OTU: -16dBm (APD), -9dBm (PIN).

M40

D40

F

I

U

M

4

0

D

40

OTU

OTU

Fixed attenuator

-13+10lgN

Signal flow and related indices at the receiving side of station B


From

station A

OAU101


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If the input optical power of OAU is lower than the nominal power, VOA should be removed.

PsinglePtotal - 10lgN - IL of D40.

From

station A

M40

D40OPU03

F

I

U

M

4

0

D

40

OTU

OTU

Typical optical power of the reference points at the receivingside

of station B

-13+10lgN -16+10lgN 4+10lgN -2.5dBm


OAU101


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Power Calculation of Main Path - OLA

Station A Station C

OLAOTM OTM

Station B

40km(12dB)

OBU101 boards are used at the transmitting side of station A & C.

OAU101 boards are used in station B.

C

B

B DCM-B

Network topology

60km(18dB)

-1+10lgN -13+10lgN

-1+10lgN-19+10lgN

C DCM-C


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OAU101

PA BAFrom

station A

F

I

U

F

I

U

DCM(B)

Typical optical power of the reference points from station

A to station C

OAU101 nominal individual channel input/output power: -16/+4dBm, gain range: 20~31dB.

IL of DCM(B): 5dB. IL of FIU: 1 dB.Actual gain of OAU101 is 20dB.

-13+10lgN -16+10lgN +4+10lgN +3+10lgN

Power Calculation of Main Path - OLA

To

station C


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Please calculate the optical power of each reference pointfrom station C to station A.

F

I

U

F

I

U

OAU101

BA

DCM(C)

PA

Is it necessary to put VOA before OAU101?

What is the actual gain of OAU101?

-19+10lgN

Questions

From

station C

To

station A


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Station A Station C

FOADMOTM OTM

Station B

40km(12dB)


OAU101 and OBU101 are used at the station B.

Two MR2 boards are used in station B.

B

B DCM-B

Network topology

80km(24dB)

-1+10lgN -13+10lgN

Power Calculation of Main Path - FOADM


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OAU101 nominal individual channel input/output Power -16/+4dBm,gain range: 20~31dB.

IL of DCM(B): 5dB. IL of FIU: 1dB. IL of MR2: 1dB.

OBU101 nominal individual channel input/output Power -20/0dBm.

OAU101

PA BA

F

I

U

F

I

U

DCM(B)

MR2MR2

O

T

U

OBU101

Typical optical power of the reference points from station A to station C

O

T

U

O

T

U

O

T

U

-13+10lgN


From

station ATo

station

C


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OAU101

PA BA

F

I

U

F

I

U

DCM(B)

MR2MR2

O

T

U

VOA

OBU101

O

T

U

O

T

U

O

T

U

-13+10lgN

-16+10lgN +4+10lgN -20+10lgN 0+10lgN

-1+10lgN


Typical optical power of the reference points from station A to station

C

From

station A

To

station

C


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Station A Station C

ROADMOTM OTM

Station B

40km(12dB)


OAU101 and OBU101 are used at the station B.

Two ROAM boards are used in station B.

B

B DCM-B

Network topology

80km(24dB)

-1+10lgN -13+10lgN

Power Calculation of Main Path - ROADM


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OAU101 nominal individual channel input/output Power -16/+4dBm, gain range:20~31dB.

IL of DCM(B): 5dB. IL of FIU: 1dB. IL of D40: 6.5dB.

IL of ROAM: Mx-OUT: 9dB, IN-DM:7dB, EXPI-OUT:14dB, IN-EXPO: 3dB.


OAU101

PA BA

F

I

U

F

I

U

DCM(B)

ROAM

O

T

U

OBU101


O

T

U

O

T

U

O

T

U

-13+10lgN

Power Calculation of Main Path ROADM 1

From

station ATo

station

C

ROAM

D40


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OAU101

PA

F

I

U

F

I

U

DCM(B)

OBU101

-13+10lgN

-16+10lgN +4+10lgN

-3+10lgN

0+10lgN

-1+10lgN


C

From

station A

To

station C

ROAM

O

T

U

O

T

U

O

T

U

O

T

U

ROAM

D40

BA

+1+10lgN

-20+10lgN



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OAU101 nominal individual channel input/output Power -16/+4dBm, gain range:20~31dB.

IL of DCM(B): 5dB. IL of FIU: 1dB. IL of D40: 6dB, IL of M40V: 8dB.

IL of WSD9: 8dB(IN-DMx,IN-EXPO).

IL of RMU9: 8.5dB(EXPI-OUT), 12.5dB (AMx-TOA), 1.5 dB (ROA-OUT)


OAU101

PA BA

F

I

U

F

I

U

DCM(B)

WSD9

O

T

U

OBU101


O

T

U-13+10lgN


From

station A

To

station

C

RMU9

D40

M40V

OBU

101

OTUOTU


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OAU101

PA

F

I

U

F

I

U

DCM(B)

OBU101

-13+10lgN


C

From

station A

To

station

C

BA


WSD9

O

T

U

O

T

U

RMU9

D40

-16+10lgN +4+10lgN -20+10lgN

0+10lgN

-1+10lgNM40V

OBU

101

OTUOTU


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Please calculate the optical power of each reference point (40channels)

Questions

F

I

U

F

I

U

OBU101

-13+10lgN

From

station A

To

station

C

WSMD4

O

T

U

O

T

U

O

T

U

O

T

U

D40

M40

OAU101 WSMD4

-2

Optical power of adding wavelength.

Optical power of passing through.


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Summary

OSC Power Calculation

OTM Power Calculation

OLA Power Calculation

FOADM Power Calculation

ROADM(ROAM) Power Calculation

ROADM(WSD9+RMU9) Power Calculation

ROADM(WSMD4+WSMD4) Power Calculation


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Documents

4. OptiX OSN 380068008800 Optical Power Calculation ISSUE 1.11