Product Name: High Quality CATV FTTH 1550 Nm External Modulated Optical Transmitter Model NO.: WT-1550-EM Condition: New Certification: CE, RoHS Function: Signal Transmission Equipment Type: Transmitter Optical Wavelength: 1545-1560nm Laser Type: Dfb Laser Sbs: +13 - +19dBm Trademark: Prevail Transport Package: Neutral or According to Customer's Request Specification: 1RU Origin: China HS Code: 8517622990 Product Description 1. Overview1.1 about This ManualThis instruction manual is a complete guide to install and operate the (1RU) WT-1550-EM30 series 1550nm external modulatedoptical transmitter. Please read the entire manual before beginning installation.This manual applies to WT-1550-EM30 series external modulatedoptical transmitter.• Chapter 1 gives general information about the WT-1550-EM30 series 1550nm external modulatedoptical transmitter.• Chapter 2 describes thecomplete technical specificationsof 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 modulatedoptical 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 modulatedtransmitter. It is specially developed for the CATV signal that satisfiesHFC network, and the long-distance transmission of cable phone and cabledata.Working principleWT-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. Usethe detected RFroot-meansquare(RMS)-total powerto calculatethe 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 signalinput 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 deterioratesthe 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 network2. Technique Parameters2.1Optical ParametersItemUnit ValueOptical Wavelengthnm1545~1560 (or specified by the user)Side-mode Suppression ratiodB>30Relative Intensity NoisedB/Hz<-160Wavelength Adjustment RangeGHz+/-50GHzOptical PowerdBm2*7, 2*8, 2*9, 2*10SBS Threshold ValuedBm+13~+19 (Continuously adjustable)Laser LinewidthMHz0.32.2Model Test IndicatorsTest ModelC42D59D84D84Channel PlanCENELEC42PAL D59PAL D84PAL DChannel Number TV/FM/QAM6442/0/059/0/084/0/030/0/48Bandwidth Noise5555CNR Tx/Rx55.554.052.554.5CNR link 155.053.552.054.0CNR link 253.052.550.552.5CNR link 350.550.549.051.0CSO Tx/Rx and link 164656570CSO link 263656570CSO link 362646365CTB656565682.3Test ConditionFirst stage EDFAFirst paragraph fiber lengthSecond stage EDFASecond paragraph fiber lengthRXSBS(dBm)Tx/RxNoNoNono0dBm13.5link 1No35kmnono0dBm13.5link 216dBm65kmnono0dBm16link 313dBm50km13dBm50km0dBm13.5Rx with 8 pA/ÖHz input noise current density; EDFA with 5dB noise figure; RF input level at 80 dBμV / TV channel;2.4Technical Data SheetItemUnitTechnical ParametersRF rangeMHz47~1003RF flatnessdB+/-0.75RF return lossdB>16RF input impedanceΩ75RF input connector type F typeRated input leveldBµV80Input level rangedBµV78~96(AGC mode, modulating signal)AGC control rangedB+3~-3MGC adjustable rangedB0~15Optical connectorSC/APC, FC/APCOperating temperature°C-5~45Storage temperature°C-30~+70Power Source SpecificationV90~265VAC36~72VDCConsumptionW≤60Dimensionmm483(L)× 455(W)×44(H)Total Weightkg5.5ProcessCompany ProfileContact us