otc103202 optix bws 1600g v100r002 optical power calculation issue1.23

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OptiX BWS 1600G Optical Power Calculation


Foreword

Do you remember the Signal Flow of OptiX BWS 1600G equipments?


Objectives

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

Grasp the relation of each reference point on the

equipments.

Grasp the common indices on optical power

calculation.

Grasp the optical power calculation.


Contents

1. Basics

2. Power calculation


Contents

1. Basics

1.1 Basic concepts

1.2 Common Indices


P (dBm) =10lg

0.1mW = ______dBm 1mW = _____dBm 10mW = _____dBm 100mW = _____dBm 20dBm-10 ___ =10dBm

Basic concepts

Units

mW

the unit of optical power dBm

the unit of optical power dB the unit of gain or attenuation of optical power

P(mW)1(mW)

Calculation


Formula

The situation of N wavelengths

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

P1

Ptotal

P2

Suppose P1= P2.

Ptotal (mW) ＝ P1 (mW) + P2 (mW)

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


Common Indices

Classificatio

nName Insertion loss

Passive

Components

M40/ D40 < 8 dB

V40 <10 dB

MR2 < 2.5 dB (add/drop) / < 3.0 dB (pass-

through)

MB2

< 3.0 dB (add/drop) / < 2.0 dB ( IN-

MRO,MRI-OUT)

< 1.0 dB (pass-through)

FIU < 1.5 dB (main channel) / < 2.0 dB (OSC ）

ITL < 3dB

DCM(S)/

DCM(A~F)

2.5 / 4 / 5 / 7 / 8 / 9 / 10 ( dB ) （ G.652 fibre ）


Name Nominal individual

channel input/output Power

Maximum total output

power Gain range

E3OAUC01 -16/+4(dBm) 20dBm 20 ~ 33dB

E3OAUC02 -19/+1(dBm) 17dBm 20 ~ 33dB

E3OAUC03A/B/C/D

-22/+4(dBm) 20dBm 26 ~ 32dB

E3OAUC03E -20/+4(dBm) 20dBm 24 ~ 36dB

E3OAUC05 -16/+7(dBm) 23dBm 23 ~ 36dB

E2OAU03 -19/+4(dBm) 20dBm 23 ~ 33dB

E2OAU05 -16/+7(dBm) 23dBm 23 ~ 33dB

Consider OptiX BWS 1600G-III and IV system: E2OAU - adjust the attenuation of the VOA in the OA. E3OAU - adjust the gain directly.

Common Indices


Name

Nominal individual

channel input/output Power

Maximum total

output power Typical

gain

E3OBUC03 -19/+4(dBm) 20dBm 23dB

E3OBUC05 -16/+7(dBm) 23dBm 23dB

E2OBU01 -16/+4(dBm) 20dBm 20dB



E3OPUC03/

E2OPUC01-24/-1(dBm) 15dBm 23dB

Common Indices


Classification Data

rate

Mean launch power （ dBm ）

receive power rage

APD （ dBm ）

PIN （ dBm ）

WDM Side Of

OTU

2.5Gbit/s 0 ~ -10 -9 ~ -25 0 ~ -18

10Gbit/s 0 ~ -5 0 ~ -14

Common Indices


Contents

1. Basics



Contents


2.1 Power calculation of OSC

2.2 Power calculation of Traffic Channel


Typical Launch Power of SC2/SC1/TC1/TC2: 0 ~ -7dBm.

receive Power ＝ Launch Power - Loss of Fiber - 2•IL of FIU. Nominal receive optical power of SC2/SC1/TC1/TC2: -30dBm.

Power calculation of OSC

TM RM

SC1/2

SC1 SC1/2

SC1

F

I

U

F

I

URM TM


Station A Station B

60km （ 18dB ）

Power calculation of traffic channel - OTM

The distance between station A and station B: 60km,line attenuation: 18dB.

The board configuration of station A and station B is the same:

transmit end: E3OBUC03.

receive end: E3OPUC03.

OTM OTM

Network topology


To station B

② ③ ④

OTU

M40

M40

E3OBUC03

F

I

U

① ⑤ ① Typical Launch Power of OTU: -2dBm.② IL of M40: 6dB, V40: 9dB.③ Min. insertion loss of VOA : 2dB.④ E3OBUC03 nominal individual channel input/output Power-19/+4dBm, t

ypical gain: 23 dB.⑤ IL of FIU:1dB.

VOA

Power calculation of traffic channel - OTM Signal flow and related indices at the transmit side of

station A

IL: Insertion loss


② ③ ④

OTU

M40

M40

F

I

U

① ⑤

E3OBUC03

To station B

Typical optical power of the reference points at the transmit side

of station A – Single Channel

-2dBm

-8dBm

-19dBm

+4dBm

+3dBm



② ③ ④

M40

M40

F

I

U

①

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

OTU

OTU

E3OBUC03

⑤

-2dBm

-8+10lgN

-19+10lgN

+4+10lgN

+3+10lgN

To station B

Typical optical power of the reference points at the transmit side

of station A – Multiplex Channels



Station A Station B

The optical power of station A to Station B: 3+10lgN(dBm). Attenuation of the line fibre: 18dB. The receive optical power of station B: -15+10lgN(dBm).

OTM OTM60km （ 18dB ）

+3+10lgN

-15+10l

gN

Power calculation of traffic channel - OTM Network topology and the line optical

power


① IL of FIU:1dB.② Min. IL of VOA : 2dB.③ E3OPUC03 nominal individual channel input/output Power -24/-1dBm, typic

al gain: 23 dB.④ IL of D40: 6dB.⑤ Typical receive optical power of OTU: -17dBm (APD), -9dBm (PIN).

① ②

M40 D40E3OPUC03

F

I

U

③ ④ ⑤

M40

D40

OTU

OTU

Fixed attenuator

-15+10l

gN

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


From station A


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

④Psingle ＝ Ptotal - 10lgN - IL of D40.

① ②

From station A

M40 D40OPU03

F

I

U

③ ④ ⑤

M40

D40

OTU

OTU

Typical optical power of the reference points at the receive side

of station B – Multiplex Channels

E3OPUC03

-15+10l

gN

-24+10l

gN

-1+10l

gN

-7dBm



Power calculation of traffic channel - OLA

Station A Station C

OLAOTM OTM

Station B

50km （ 15dB ）

E3OBUC03 is used at the transmit side of station A.

E3OAUC03/E2OAU03 is used in station B.

E3OBUC03 is used at the transmit side of station C.

D

B

D

BDCM-B

DCM-D

Network topology (N channels)

80km （ 24dB ）

+3+10lgN

-12+10l

gN

+3+10lgN

-21+10l

gN


E2OAU03

PA BAFrom station A

F

I

U

F

I

U

① ②④

③ ⑤ ⑥DCM(B

)

Typical optical power of the reference points - Single Channel, E2OAU

③ ⑤ E2OAU03 nominal individual channel input/output power: -19/+4dBm, gain range: 23~33dB.④ IL of DCM(B): 5dB.

20dB 19dB

-12dB

m

-19dBm +4dBm

+3dBm


To station C


E3OAUC03E

PA BA

F

I

U

F

I

U

① ②④

③ ⑤ ⑥DCM(B

)③ ⑤ E3OAUC03E nominal individual channel input/output power: -20/+4dBm gain range: 24~36dB.④ IL of DCM(B): 5dB.

-12dB

m

-20dBm +4dBm +3dBm

Typical optical power of the reference points - Single Channel, E3OAU

From station A

To station C



OAU

PA BA

F

I

U

F

I

U

① ②④③ ⑤ ⑥

DCM(B)

Comparison between E2OAU and E3OAU

NamePA

input

PA

output

VOA

attenuation

BA

input

BA

outputGain

E2OAU03

E3OAUC03

E

—— —— ——

-12dBm

From station A

To station C



③ ⑤ E3OAUC03E nominal single channel input/output Power: -20/+4dBm, gain range:24~36dB. the input optical power is lower than the nominal power, what to do ？④ IL of DCM(D): 8dB.③ ④ ⑤ the actual gain of the OAU should be:

Remove the VOA

F

I

U

F

I

U

①②③⑤⑥

E3OAUC03E

BA

④

DCM(D)

PA

-21dB

m

-22dB

m

+4dBm

+3dBm

26dB.

Power calculation of traffic channel - OLA Typical optical power of the reference points from station C

to station A

From station C

To station A


How about the power calculation of OLA ,multiplex channels?

F

I

U

F

I

U

①②③

⑤

E3OAUC03E

BA

④DCM(D

)

PA

Attention: just consider the individual channel optical power of the OA .

-21+10l

gN

Questions

From station C

To station A


Station A Station C

OADMOTM OTM

Station B

50km （ 15dB ）

E3OBUC03 is used at the transmit side of station A .

Two MR2 is used in station B.

B

BDCM-B

Network topology (N channels)

80km （ 24dB ）

+3+10lgN

-12+10l

gN

Power calculation of traffic channel - OADM


③ ⑤ E3OAUC03E nominal individual channel input/output Power -20/+4dBm, gain range:24~36dB.④ IL of DCM(B): 5dB.⑥⑧ IL of MR2: 2dB.⑨E3OBUC03 nominal individual channel input/output Power -19/+4dBm.

① ② ③④

⑤ ⑥ ⑦ ⑧ ⑨ ⑩

E3OAUC03E

PA BA

F

I

U

F

I

U

DCM(B)

MR2MR2

OTU

E3OBUC03

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

OTU

OTU

OTU

-12+10l

gN

Power calculation of traffic channel - OADM

From station A

To station C


①

②

③④

⑤ ⑥ ⑦ ⑧ ⑨ ⑩

E3OAUC03E

PA BA

F

I

U

F

I

U

DCM(B)

MR2MR2

OTU

VOA

E3OBUC03

OTU

OTU

OTU

-12+10l

gN

-20+10l

gN

+4+10lgN

-19+10l

gN

+4+10lgN

+3+10lgN

Power calculation of traffic channel - OADM Typical optical power of the reference points from station C

to station A

From station A

To station C


What are the units related to optical power?

The conversion between mW and dBm?

What’s the difference of power calculation between OADM and OL

A?

Questions


Basics

Power calculation

Power calculation of OSC

Power calculation of Traffic Channel (OTM, OLA, OADM).

Summary

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otc103202 optix bws 1600g v100r002 optical power calculation issue1.23

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