• China CATV FTTH 1550 Nm External Modulated Optical Transmitter
  • China CATV FTTH 1550 Nm External Modulated Optical Transmitter
  • China CATV FTTH 1550 Nm External Modulated Optical Transmitter

China CATV FTTH 1550 Nm External Modulated Optical Transmitter

Type: Transmitter
Function: Signal Transmission Equipment
Certification: CE, RoHS
Condition: New
Optical Wavelength: 1545-1560nm
Laser Type: Dfb Laser
Customization:
Diamond Member Since 2022

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Basic Info.

Model NO.
WT-1550-EM
Sbs
+13 - +19dBm
Transport Package
Neutral or According to Customer′s Request
Specification
1RU
Trademark
Prevail
Origin
China
HS Code
8517622990
Production Capacity
200PCS/Month

Product Description

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 external modulated optical transmitter. Please read the entire manual before beginning installation.
This manual applies to WT-1550-EM30 series external modulated optical transmitter.
• Chapter 1 gives general information about the WT-1550-EM30 series 1550nm external modulated optical transmitter.
• Chapter 2 describes the complete technical specifications of WT-1550-EM30.
• Chapter 3 describes the front/rear panel interfaces and menu system.
• Chapter 4 tells you how to install WT-1550-EM30 series external 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 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
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.
    

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.

1.3 Product Applications

• High-performance long-distance transmission
• High-power distribution network
• Redundancy loop architecture
• FTTx network
• RFOG application
• DWDM network

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
 


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
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China CATV FTTH 1550 Nm External Modulated Optical Transmitter

 

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