Baudcom BD-5800H Manuale utente

Shanghai Baudcom Communication Device Co.,LTD

Website: www.baudcom.com.cn Tel：+86-21-37709251 Email: info@baudcom.com.cn

Model:BD-5800H

1550nm

xternal

odulat

Optical Transmitter

Operating Manual

1550nm external modulated optical transmitter operating manual

Website: www.baudcom.com.cn Tel：+86-21-37709251 Email: info@baudcom.com.cn

- 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 ......................................................................... - 8 -

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.................................................. - 12 -

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

4. Installing the the Optical Transmitter ............................................................... - 13 -

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

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

4.3 Mounting the Equipment......................................................................... - 14 -

4.3.1 Mounting the Equipment 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 ....................................................... - 17 -

5.4 Remote Monitoring: SNMP .................................................................... - 20 -

1550nm external modulated optical transmitter operating manual

Website: www.baudcom.com.cn Tel：+86-21-37709251 Email: info@baudcom.com.cn

- 2 -

5.5 WEB Network Management ................................................................... - 21 -

6. Maintenance and Troubleshooting ................................................................... - 23 -

6.1 Cleaning Fiber Optic Connectors ............................................................ - 23 -

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

6.2 Troubleshooting ...................................................................................... - 24 -

6.3 Disclaimer .............................................................................................. - 25 -

Safety Instruction

1550nm external modulated optical transmitter operating manual

Website: www.baudcom.com.cn Tel：+86-21-37709251 Email: info@baudcom.com.cn

- 3 -

1. Overview

1.1 About This Manual

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

1550nm external modulated optical transmitter. Please read the entire manual before

beginning installation.

This manual applies to the external modulated optical transmitter.

• Chapter 1 gives general information about the 1550nm external modulated optical

transmitter.

• Chapter 2 describes the complete technical specifications of the equipment.

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

• Chapter 4 tells you how to install the external modulated optical transmitter.

• Chapter 5 tells you the communication setting of the equipment.

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

1.2 Product Description

This optical transmitter is a 1550nm DFB laser external 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

It 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.

1550nm external modulated optical transmitter operating manual

Website: www.baudcom.com.cn Tel：+86-21-37709251 Email: info@baudcom.com.cn

- 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, this 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

1550nm external modulated optical transmitter operating manual

Website: www.baudcom.com.cn Tel：+86-21-37709251 Email: info@baudcom.com.cn

- 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*5, 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

1550nm external modulated optical transmitter operating manual

Website: www.baudcom.com.cn Tel：+86-21-37709251 Email: info@baudcom.com.cn

- 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 Ω 75

RF input connector type F type

Rated input level dBµV 80

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

1550nm external modulated optical transmitter operating manual

Website: www.baudcom.com.cn Tel：+86-21-37709251 Email: info@baudcom.com.cn

- 7 -

3. Panel Interface and Menu System Description

3.1 Front Panel

Power indicator 2 AGC indicator 3

RF modulation degree indicator

Laser indicator 5 LCD 6

ESC key

UP key 8 DOWN key 9

Enter key

RF input port (or on the rear

panel, optional) 11

-20dB RF input test port

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

1550nm external modulated optical transmitter operating manual

Website: www.baudcom.com.cn Tel：+86-21-37709251 Email: info@baudcom.com.cn

- 8 -

3.2 Rear Panel

Ground stud 2

Power module 3

Fan

RF input port (or on the front

panel, optional) 5

RS232 interface 6

LAN interface

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

Mounting screws 2

220V power outlet 3

Fuse

Power switch

3.3.2 48V Power Module

Mounting screws 2

+ Positive terminal block

- Negative terminal block

1550nm external modulated optical transmitter operating manual

Website: www.baudcom.com.cn Tel：+86-21-37709251 Email: info@baudcom.com.cn

- 9 -

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

Indice

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