Prevail-Catv WT-1550-EM10 Manuale utente

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WT-1550-EM10

1550nm External Modulated

Optical Transmitter

Operating Manual

WT-1550-EM10 1550nm external modulated optical transmitter operating manual

- 1 -

Table of Contents

Table of Contents......................................................................................................- 1 -

Safety Instruction......................................................................................................- 2 -

1. Overview...............................................................................................................- 3 -

1.1 About This Manual ......................................................................................- 3 -

1.2 Product Description .....................................................................................- 3 -

1.3 Product Applications....................................................................................- 4 -

2. Technique Parameters...........................................................................................- 5 -

2.1 Optical Parameters.......................................................................................- 5 -

2.2 Model Test Indicators...................................................................................- 5 -

2.3 Test Condition..............................................................................................- 6 -

2.4 Technical Data Sheet....................................................................................- 6 -

3. Panel Interface and Menu System Description.....................................................- 7 -

3.1 Front Panel...................................................................................................- 7 -

3.1.1 Indicator Description .........................................................................- 7 -

3.2 Rear Panel....................................................................................................- 8 -

3.3 Power Module..............................................................................................- 8 -

3.3.1 220V Power Module..........................................................................- 8 -

3.3.2 48V Power Module............................................................................- 9 -

3.4 Menu Operation...........................................................................................- 9 -

3.4.1 Main Menu.........................................................................................- 9 -

3.4.2 Display Menu...................................................................................- 10 -

3.4.3 Set Menu.......................................................................................... - 11 -

3.4.4 Alarm Menu .....................................................................................- 12 -

3.4.5 AGC Mode....................................................................................... - 12 -

3.4.6 MGC Mode......................................................................................- 12 -

3.4.7 SBS Suppression Adjustment ..........................................................- 12 -

4. Installing the WT-1550-EM10 Optical Transmitter............................................- 13 -

4.1 Receiving and Inspecting...........................................................................- 13 -

4.2 Precautions.................................................................................................- 13 -

4.3 Mounting WT-1550-EM10 ........................................................................- 14 -

4.3.1 Mounting the EM10 in the Rack......................................................- 14 -

4.3.2 Connecting the RF Cables ...............................................................- 14 -

4.3.3 Connecting the Optical Fiber Cables...............................................- 14 -

4.3.4 Connecting the Ethernet Cable ........................................................- 15 -

4.3.5 Connecting Power............................................................................- 15 -

5. Communication Setup.........................................................................................- 16 -

5.1 RS232 Communication Interface Description...........................................- 16 -

5.2 Set up the Hyper Terminal .........................................................................- 16 -

5.3 Operating Parameters Configuration .........................................................- 18 -

5.4 Remote Monitoring: SNMP.......................................................................- 21 -

5.5 WEB Network Management......................................................................- 22 -

WT-1550-EM10 1550nm external modulated optical transmitter operating manual

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6. Maintenance and Troubleshooting......................................................................- 24 -

6.1 Cleaning Fiber Optic Connectors...............................................................- 24 -

6.1.1 Cleaning Patch Cord or Pigtail Fiber Optical Connectors...............- 24 -

6.2 Troubleshooting .........................................................................................- 25 -

6.3 After-sales Service Description..................................................................- 26 -

6.4 Disclaimer..................................................................................................- 26 -

Safety Instruction

WT-1550-EM10 1550nm external modulated optical transmitter operating manual

- 3 -

1. Overview

1.1 About This Manual

This instruction manual is a complete guide to install and operate the (1RU)

WT-1550-EM10 series 1550nm external modulated optical transmitter. Please read

the entire manual before beginning installation.

This manual applies to WT-1550-EM10 series external modulated optical

transmitter.

• Chapter 1 gives general information about the WT-1550-EM10 series 1550nm

external modulated optical transmitter.

• Chapter 2 describes the complete technical specifications of WT-1550-EM10.

• Chapter 3 describes the front/rear panel interfaces and menu system.

• Chapter 4 tells you how to install WT-1550-EM10 series external modulated optical

transmitter.

• Chapter 5 tells you the communication setting of WT-1550-EM10.

• Chapter 6 describes maintenance and what to do in the event of problems.

1.2 Product Description

WT-1550-EM10 series optical transmitter is 1550nm external modulated single

output optical transmitter. It is specially developed for the CATV signal that satisfies

HFC network, and the medium/short distance transmission of cable phone and cable

data.

Working principle

WT-1550-EM10 series transmitter has 7 function modules: RF control, DFB laser,

optical modulator, SBS control, CSO control, communication/display control and

power supply.

Automatic gain control circuit (AGC) or manual gain control circuit (MGC)

amplifies the RF signal. AGC or MGC control makes the optical modulator maintain a

suitable input level. Use the detected RF root-meansquare(RMS)-total power to

calculate the optical modulation index(OMI).

In general we recommend using the AGC function, and special users can use the

MGC function to adjust the CNR/CSO/CTB performance indexes.

The core of transmitter is the optical modulator. The 1550nm signal input the

optical modulator, make the laser intensity changed follow the external RF signal

voltage, and then generate theAM optical signal.

WT-1550-EM10 1550nm external modulated optical transmitter operating manual

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Stimulated Brillouin Scattering (SBS) occurs, when the optical input power is

greater than a certain threshold value. SBS generate the lower frequency

backscattered light which will attenuate the transmission light and return to the laser

while destroying its performance. Causing optical power fluctuation, generates large

noise, and seriously deteriorates the system carrier to noise ratio (CNR). EM10 series

optical transmitter adopts SBS control technology which is independent researched

and developed by ourselves to improve the system CNR.

The optical modulator has a two-way optical signal output. Parts of that signal

are routed to an InGaAs photodiode. This detection of the optical signal has two

functions:

1) Detect whether the laser is normal working. Once the output optical power is

2dB lower than standard power, alarm will be set off.

2) Detect CSO distortion to optimize the bias point of the optical modulator. For

working normal the detector circuit needs at least two carrier signal inputs with an

interval of 24MHz. There is a CSO initialization program in the boot process. If the

CSO install failed, the RF indicator will flash red, see details in 6.2 Troubleshooting.

Block Diagram

1.3 Product Applications

• High-power distribution network

• Redundancy loop architecture

• FTTx network

• RFOG application

• DWDM network

WT-1550-EM10 1550nm external modulated optical transmitter operating manual

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2. Technique Parameters

2.1 Optical Parameters

Item

Unit

Value

Optical Wavelength

1545～1560 (or specified by the user)

Side-mode Suppression ratio

>30

Relative Intensity Noise

dB/Hz

<-155

Optical Power

dBm

1*3, 1*5,1*6

SBS Threshold Value

dBm

+13～+16.5 (Continuously adjustable)

Laser Linewidth

MHz

0.65

2.2 Model Test Indicators

Test Model

D59

D84

Channel Plan

PAL D59

PAL D84

Channel Number

TV/FM/QAM64

59/0/0

84/0/0

Bandwidth Noise

CNR Tx/Rx

52.5

51.0

CNR Link 1

50.5

CNR Link 2

49..5

CSO Tx/Rx and Link 1

CSO Link 2

CTB

WT-1550-EM10 1550nm external modulated optical transmitter operating manual

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2.3 Test Condition

First stage

EDFA

First

paragraph

fiber length

Second

stage

EDFA

Second

paragraph

fiber length

SBS

(dBm)

Tx/Rx

0dBm

13.5

Link 1

35km

0dBm

13.5

Link 2

16dBm

65km

0dBm

Link 3

13dBm

50km

13dBm

50km

0dBm

13.5

Rx with 8 pA/ÖHz input noise current density; EDFA with 5dB noise figure; RF input level at 80

dBμV / TV channel;

2.4 Technical Data Sheet

Item

Unit

Technical Parameters

RF range

MHz

47～1003

RF flatness

+/-0.75

RF return loss

>16

RF input impedance

RF input connector type

F type

Rated input level

dBµV

Input level range

dBµV

78~96 (AGC mode, modulating signal)

AGC control range

+3～-3

MGC adjustable range

0~15

Optical connector

SC/APC, FC/APC

Operating temperature

°C

-5～50

Storage temperature

°C

-30～+70

Power Source

Specification

90～265VAC

36～72VDC

Consumption

≤60

Dimension

483(L) ×455(W) ×44(H)

Total Weight

5.5

WT-1550-EM10 1550nm external modulated optical transmitter operating manual

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3. Panel Interface and Menu System Description

3.1 Front Panel

Power indicator

AGC indicator

RF modulation degree

indicator

Laser indicator

LCD

ESC key

UP key

DOWN key

Enter key

-20dB RF input test port

RF input port (or on the

rear panel, optional)

Optical output interfaceA (or

on the rear panel, optional)

Optical output interface B (or

on the rear panel, optional)

3.1.1 Indicator Description

Power indicator

One power supply

LED yellow

Two power supplies

LED green

AGC indicator

AGC mode

LED green

MGC mode

LED off

RF modulation degree

indicator

Normal

LED green

Abnormal

LED flash red

Laser indicator

Bias current, cooling current and

output power are all normal

LED green

At least one of bias current,

cooling current and output power

is abnormal

LED flash red

WT-1550-EM10 1550nm external modulated optical transmitter operating manual

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3.2 Rear Panel

Ground stud

Power module

Fan

RF input port (or on the front

panel, optional)

RS232 interface

LAN interface

Optical output interface (or on

the front panel, optional)

3.3 Power Module

3.3.1 220V Power Module

Mounting screws

220V power outlet

Fuse

Power switch

WT-1550-EM10 1550nm external modulated optical transmitter operating manual

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3.3.2 48V Power Module

Mounting screws

+ Positive terminal block

- Negative terminal block

3.4 Menu Operation

3.4.1 Main Menu

Displayed parameters

Comments

Boot display

1.Disp Parameters

Menu one: Display parameters

2.Set Parameters

Menu two: Set parameters

3.Alarm Status

Menu three:Alarm status

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