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1. Overview
1.1 About This Manual
This instruction manual is guide to install and operate the (1RU) WT1550-EM20 series 1550nm external modulated optical transmitter. Please read the entire manual before beginning installation.
This manual applies to WT1550-EM20 series external modulated optical transmitter.
1.2 Product Description
WT1550-EM20 series optical transmitter adopt top-international brand external modulated laser and external modulator, Prevail patent pre-distortion circuit and SBS control circuit. Overall indexes reach to well-known brand types level, and price is inexpensive.We have sold thousands of products over the years.The products save plenty of costs for operator's network construction and get many users' good reputation.
1.3 Features
This 1550nm optical transmitter can be used in long-distance transmission.
Double microwave source SBS control, +13~+19dBm adjustable, 0.5dB step.
Adopt the DFB laser and LiNbO3 external modulator.
support Ethernet transponder
support WEB and SNMP network management.
Hot backup dual power modules
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 |
| Channel Plan | CENELEC42 | PAL D59 | PAL D84 |
| Channel Number TV/FM/QAM64 | 42/0/0 | 59/0/0 | 84/0/0 |
| Bandwidth Noise | 5 | 5 | 5 |
| CNR Tx/Rx | 55.0 | 54.0 | 52.5 |
| CNR Link 1 | 54.0 | 53.5 | 52.0 |
| CNR Link 2 | 53.0 | 52.5 | 50.5 |
| CNR Link 3 | 50.5 | 50.5 | 49.0 |
| CSO Tx/Rx and Link 1 | 64 | 64 | 64 |
| CSO Link 2 | 63 | 64 | 64 |
| CSO Link 3 | 62 | 62 | 62 |
| CTB | 62 | 62 | 62 |
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 |
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 | |
| Input level range | dBµV | 80±5 |
| 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 |
