77WT1500 Series 1550nm External Modulation Optical Transmitter 1U Dual Power for CATV FTTH

• Alternative Names: 1550nm External Modulation Transmitter, LiNbO3 Modulator Transmitter, Long Distance CATV Transmitter, Single/Dual Fiber Optical Transmitter, CATV Backbone Transmitter, FTTH Optical Transmitter
• Main Applications: CATV trunk/distribution network, digital/analog TV hybrid network, CWDM/DWDM system, fiber optic sensing, security monitoring, large-scale FTTH deployment
• Core Highlights: Narrow linewidth DFB laser + LiNbO3 external modulation, 32-bit ARM control, unique "wind pendulum" phase tracking, 13-19dBm adjustable SBS threshold, digital RF predistortion, 1.54" LCD display, SNMP network management, hot-swappable dual power supply

The 77WT1500 series is a high-performance 1550nm external modulation optical transmitter independently developed by Shandong Wanshuo Optoelectronic with complete independent intellectual property rights. Adopting advanced LiNbO₃ external modulation technology, it delivers superior signal quality, longer transmission distance and higher reliability compared with traditional internal modulation transmitters, making it the core equipment for medium and long distance CATV network construction.

This series provides two configurable models: 77WT1500-D (single-fiber single-port) and 77WT1500-A (dual-fiber dual-port). It uses a narrow linewidth (≤2nm) low-noise DFB continuous wave laser and high-performance LiNbO₃ external modulator for signal modulation, ensuring excellent CSO performance while improving optical power into the fiber and extending transmission distance. Equipped with a 32-bit high-performance ARM processor and complete automatic monitoring system, it accurately monitors optical output power and laser operating conditions in real time to ensure stable long-term operation.

The device features a unique "wind pendulum" modulator phase tracking system, providing more precise control and a wider operating temperature range (-5℃~+65℃). The CPU-programmed microwave source dynamically adjusts signal frequency and amplitude with low harmonics, and the SBS threshold is continuously adjustable. The RF digital predistortion system precisely matches the predistortion amount according to signal strength, ensuring optimal CNR/CTB/CSO parameters. It supports AGC/MGC RF gain modes and OMI ±10dB adjustment.

Adopting a standard 19-inch 1U rack-mount structure, it is equipped with a 1.54-inch LCD screen on the front panel to display real-time working parameters and fault information. It supports standard SNMP network management via RJ45 interface, enabling local and remote monitoring and control. The hot-swappable dual power supply (AC 90-265V / DC 38-58V optional) with clip-on fixation ensures uninterrupted 24/7 operation.

• Medium and long distance CATV trunk and distribution network transmission
• County-level, city-level and provincial CATV backbone networks
• Digital TV and analog TV hybrid network transmission
• CWDM/DWDM dense wavelength division multiplexing systems
• Fiber optic sensing and security monitoring systems
• Large-scale FTTH full-service CATV deployment
• High-definition TV and 4K TV long-distance signal transmission
• Cross-regional CATV network interconnection

1. Advanced External Modulation Technology: LiNbO₃ modulator + narrow linewidth DFB laser, delivers superior signal quality and 3x longer transmission distance than internal modulation transmitters
2. Unique Phase Tracking System: Patented "wind pendulum" mode, wider operating temperature range and more stable modulation performance
3. Intelligent SBS Control: Continuously adjustable SBS threshold, maximizes optical power transmission while avoiding signal distortion
4. Digital RF Predistortion: Precisely matches predistortion amount, ensures optimal CNR/CTB/CSO parameters even after long-distance transmission
5. Flexible Configuration: Single-port/dual-port options, 7-10dBm output power customizable, meets different network scale needs
6. Comprehensive Monitoring & Management: 1.54" LCD real-time display + SNMP remote management, reduces O&M costs by 60%
7. Carrier-Grade Reliability: Hot-swappable dual power supply, modular structure, 99.999% system availability
8. Complete Independent Intellectual Property: Independent R&D and production, provides customized firmware and hardware services