1. Overview
1.1 About This Manual
This instruction manual is a complete guide to install and operate the (1RU) WT-1550-DM optical transmitter. Please read the entire manual before beginning installation.
This manual applies to WT-1550-DM optical transmitter.
• Chapter 1 gives general information about the WT-1550-DM optical transmitter.
• Chapter 2 describes the complete technical specifications of WT-1550-DM.
• Chapter 3 describes the front/rear panel interfaces and menu system.
• Chapter 4 tells you how to install WT-1550-DM optical transmitter.
• Chapter 5 tells you the communication setting of WT-1550-DM.
• Chapter 6 describes maintenance and what to do in the event of problems.
1.2 Product Description
WT-1550-DM intelligent directly modulated optical transmitter is mainly used in 1550nm optical fiber transmission system. Adopt advanced electronic dispersion compensation technology, accurately compensate according to the actual transmission distance by 1km stepping. The maximum compensated distance up to 50km.
WT-1550-DM intelligent directly modulated optical transmitter is the most important equipment to construct the CATV network. It mainly used for the value-added services of TV image signal, digital television signal, telephone voice signal and data (or compressed data) signal. By built-in WDM, multiplex the inter-cut optical signal and the main optical signal then output. After setting required optical difference, the perfect adjustable optical attenuation function can automatic control the inserted optical signal according to the main optical signal, realize inter-cut system full automatic adjustment. Provide high quality low cost solution for all-optical relay 1550 optical fiber CATV system, and local value-added services inter-cut.
Characteristics:
- Patent pre-distortion circuit.
- The optical fiber distance is adjustable according to the actual use condition by 1km stepping.
- WT-1550-DMII: Built-in WDM, multiplex the inserted optical signal and the main optical signal then output.
- WT-1550-DM III: Built-in WDM and adjustable attenuator.
Model Selection:
WT-1550-DM-I: standard 1550nm directly modulated optical transmitter, the default optical output power is 10mW, and the optical output wavelength can choose ITU standard wavelength.
WT-1550-DM-II: on the base of WT-1550-DM-I, add inter-cut function and built-in WDM. The WDM specification please specify when ordering.
WT-1550-DM-III: on the base of WT-1550-DM-II, add VOA Variable Optical Attenuator, can adjust the signal optical power intensity by the menu options on the front panel.
1.3 Product Applications
• 1550nm Optical fiber transmission system
• Construct the CATV network
• Local value-added services inter-cut
2. Technique Parameters
| Item |
Unit |
Technique Parameters |
| Output optical power |
mW |
10* |
| Optical wavelength |
nm |
1550±10 (have to be ITU wavelength when with inter-cut function) |
| Dispersion compensation distance |
Km |
≤50 |
| Laser type |
|
DFB laser |
| Optical modulation mode |
|
Direct optical intensity modulation |
| Optical connector type |
|
FC/APC or SC/APC |
| Frequency range |
MHz |
47-862/1003 |
| RF input level |
dBμV |
75-85 |
| Flatness in band |
dB |
±0.75 |
| RF input impedance |
Ω |
75 |
| Input return loss |
dB |
≥ 16 |
| AGC control range |
dB |
±5 |
| MGC control range |
dB |
0-20 |
| Supply voltage |
V |
AC 110V-250V (50Hz) |
| Consumption |
W |
30 |
| Operating temperature |
ºC |
0 -- 45 |
| Storage temperature |
ºC |
-20 -- +65 |
| Relative humidity |
% |
Max 95% no condensation |
| Dimension |
mm |
483(L)×380(W)×44(H) |
Special instructions: The performance parameters of this manual according to the measuring method of GY/T 143-2000 <Specifications and methods of measurement on AM optical transmitter and receiver used in CATV systems>, and tested under the specified test conditions.
* The output optical power doesn't involve optical ATT and WDM insertion loss. Optical ATT+WDM insertion loss≤ 1.5dB,optical ATT or WDM insertion loss ≤ 1dB.
Test Indicators
| Test Model |
C42 |
D59 |
D84 |
| Channel |
CENELEC42 |
PAL D59 |
PAL D84 |
| C/N |
50 |
49 |
47.5 |
| CSO |
60 |
60 |
58 |
| CTB |
65 |
65 |
65 |
| 25km optical fiber, -1dBm receiving optical power, 80dBμV input |
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