NET-K WT-1550-EM30 Manuel utilisateur

WT-1550-EM30

1550nm Externally Modulated Optical

Transmitter Operating Manual

WT- 1550- EM30 1550nm externally 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 Frequency Adjust ITU in DWDM ................................................... - 13 -

3.4.8 SBS Suppression Adjustment .......................................................... - 13 -

4. Installing the WT-1550-EM30 Optical Transmitter............................................ - 14 -

4.1 Receiving and Inspecting........................................................................... - 14 -

4.2 Precautions................................................................................................. - 14 -

4.3 Mounting WT-1550-EM30 ........................................................................ - 15 -

4.3.1 Mounting the EM30 in the Rack...................................................... - 15 -

4.3.2 Connecting the RF Cables ............................................................... - 15 -

4.3.3 Connecting the Optical Fiber Cables ............................................... - 15 -

4.3.4 Connecting the Ethernet Cable ........................................................ - 16 -

4.3.5 Connecting Power............................................................................ - 16 -

5. Communication Setup

......................................................................................... - 17 -

5.1 RS232 Communication Interface Description........................................... - 17 -

5.2 Set up the Hyper Terminal ......................................................................... - 17 -

5.3 Operating Parameters Configuration ......................................................... - 19 -

5.4 Remote Monitoring: SNMP....................................................................... - 22 -

WT- 1550- EM30 1550nm externally modulated optical transmitter operating manual

- 2 -

5.5 WEB Network Management...................................................................... - 23 -

6. Maintenance and Troubleshooting...................................................................... - 25 -

6.1 Cleaning Fiber Optic Connectors............................................................... - 25 -

6.1.1 Cleaning Patch Cord or Pigtail Fiber Optical Connectors............... - 25 -

6.2 Troubleshooting ......................................................................................... - 26 -

6.3 After-sales Service Description.................................................................. - 27 -

6.4 Disclaimer.................................................................................................. - 27 -

WT- 1550- EM30 1550nm externally 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-EM30 series 1550nm externally modulated optical transmitter. Please read

the entire manual before beginning installation.

This manual applies to WT-1550-EM30 series externally modulated optical

transmitter.

•Chapter 1 gives general information about the WT-1550-EM30 series 1550nm

externally modulated optical transmitter.

• Chapter 2 describes thecomplete technical specifications of WT-1550-EM30.

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

•Chapter 4 tells you how to install WT-1550-EM30 series externally modulated

optical transmitter.

• Chapter 5 tells you the communication setting of WT-1550-EM30.

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

1.2 Product Description

WT-1550-EM30 series optical transmitter is a 1550nm DFB laser externally

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

HFC network, and the long-distance transmission of cable phone and cable data.

Working principle

WT-1550-EM30 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 the AM optical signal.

WT- 1550- EM30 1550nm externally modulated optical transmitter operating manual

- 4 -

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). To improve

the SBS threshold, WT-1550-EM30 series optical transmitter adopts SBS control

technology which is independent researched and developed by ourselves. The

threshold value can be set up to 19dBm.

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-performance long-distance transmission

• High-power distribution network

• Redundancy loop architecture

• FTTx network

• RFOG application

• DWDM network

WT- 1550- EM30 1550nm externally modulated optical transmitter operating manual

- 5 -

2. Technique Parameters

2.1 Optical Parameters

Item Unit Value

Optical Wavelength nm 1545〜1560 (or specified by the user)

Side-mode Suppression ratio dB >30

Relative Intensity Noise dB/Hz <-160

Wavelength Adjustment

Range GHz +/-50GHz

Optical Power dBm 2*7, 2*8, 2*9, 2*10

SBS Threshold Value dBm +13〜+19 (Continuously adjustable)

Laser Linewidth MHz 0.3

2.2 Model Test Indicators

Test Model C42 D59 D84 D84

Channel Plan CENELEC42 PAL D59 PAL D84 PAL D

Channel Number

TV/FM/QAM64 42/0/0 59/0/0 84/0/0 30/0/48

Bandwidth Noise 5 5 5 5

CNR Tx/Rx 55.5 54.0 52.5 54.5

CNR Link 1 55.0 53.5 52.0 54.0

CNR Link 2 53.0 52.5 50.5 52.5

CNR Link 3 50.5 50.5 49.0 51.0

CSO Tx/Rx and Link 1 64 65 65 70

CSO Link 2 63 65 65 70

CSO Link 3 62 64 63 65

CTB 65 65 65 68

WT- 1550- EM30 1550nm externally modulated optical transmitter operating manual

- 6 -

2.3 Test Condition

First stage

EDFA

First

paragraph

fiber length

Second

stage

EDFA

Second

paragraph

fiber length

RX SBS

(dBm)

Tx/Rx No No No no 0dBm 13.5

Link 1 No 35km no no 0dBm 13.5

Link 2 16dBm 65km no no 0dBm 16

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 dB +/-0.75

RF return loss dB >16

RF input impedance Ω75

RF input connector type F type

Rated input level

dBµV

Input level range dBµV 78~96 (AGC mode, modulating signal)

AGC control range dB +3〜-3

MGC adjustable range dB 0~15

Optical connector SC/APC, FC/APC

Operating temperature °C -5〜45

Storage temperature °C -30〜+70

Power Source

Specification V 90〜265VAC

36〜72VDC

Consumption W ≤60

Dimension mm 483(L) × 455(W) × 44(H)

Total Weight kg 5.5

WT- 1550- EM30 1550nm externally modulated optical transmitter operating manual

- 7 -

3. Panel Interface and Menu System Description

3.1 Front Panel

1 Power indicator 2 AGC indicator 3 RF modulation degree

indicator

4 Laser indicator 5 LCD 6 ESC key

7 UP key 8 DOWN key 9 Enter key

10 -20dB RF input test port 11 RF input port (or on the

rear panel, optional) 12 Optical output interface A (or

on the rear panel, optional)

13 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- EM30 1550nm externally modulated optical transmitter operating manual

- 8 -

3.2 Rear Panel

1 Ground stud 2 Power module 3 Fan

4 RF input port (or on the front

panel, optional) 5 RS232 interface 6 LAN interface

7 Optical output interface A (or

on the front panel, optional) 8 Optical output interface B (or

on the front panel, optional)

3.3 Power Module

3.3.1 220V Power Module

1 Mounting screws 2 220V power outlet 3 Fuse

4 Power switch

WT- 1550- EM30 1550nm externally modulated optical transmitter operating manual

- 9 -

3.3.2 48V Power Module

1 Mounting screws 2 + Positive terminal block 3 - 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

Table des matières

Manuels Émetteur populaires d'autres marques

NIVELCO

NIVELCO EasyTREK SCA-300 Series Manuel du propriétaire

Honeywell

Honeywell 5816WMBR Manuel utilisateur

Kamstrup

Kamstrup READy MTU Mode d'emploi

Omega

Omega ZW Series Manuel utilisateur

ABB

ABB Field 264H Mode d’emploi

Alinco

Alinco DJ-V17T Manuel utilisateur

Dejero

Dejero EnGo 3x Manuel utilisateur

Rosemount

Rosemount 4600 Manuel utilisateur

Speaka Professional

Speaka Professional 2342740 Manuel utilisateur

trubomat

trubomat GAB 1000 Manuel utilisateur

Teledyne Analytical Instruments

Teledyne Analytical Instruments LXT-380 Manuel utilisateur

Rondish

Rondish UT-11 Manuel utilisateur

MG 10JRE Manuel utilisateur

Burkert

Burkert 8177 Manuel utilisateur

Firetide

Firetide HotPort 3203 Manuel

Tele Radio

Tele Radio T9-02 Manuel utilisateur

Rotronic

Rotronic HygroFlex HF3 Series Manuel utilisateur

Jamara

Jamara FCX6 Pro Tel Manuel utilisateur