机架式外调制光发射机以1550nm DFB激光器为光源，采用AM-VSB残余边带调幅方式传送信号。主要用于电视图像信号，数字电视信号、电缆电话和数据信号的远距离光纤传输，是构建大中型CATV远距离光纤传输网络的重要设备。 external modulation optical transmitter uses 1550nm DFB laser as its light source, adopts AM-VSB residual sideband amplitude modulation way to convey the signal. Mainly used in the remote transmission of television signal, digital TV signal, cable telephone and data signal, it is the important equipment in building large and middle-scale CATV optical fiber network. 特点 Features --美国JDS-U公司1550nm DFB激光器和LiNbO3外调制器 --先进的RF预失真电路设计，保证良好的C/N和非线性指标 --独有的可调式SBS设计(13/16/18dBm) --微电脑自动监控电路，实时精确监控光输出功率和激光器工作状态 --19″1U标准机架,前面板VFD显示，实现本地监控 --RS-232/485接口，方便实现网管监控 --JDS-U 1550nm DFB laser module and LiNbO3 external modulator --Advanced RF pre-distortion circuit for excellent CNR and low distortion --Adjustable SBS threshold (13/16/18dBm) --Microprocessor control and monitor --Front panel VFD display --47-862MHz bandwidth --RS232/485 interface optional for remote monitoring and control 技术参数 Technical Parameter 光特性Optical Transmitter 光波长Wave Length | 1550±5 nm | 光输出口 Optical output | 2 | 光输出功率 Optical output power | ≥7 dBm | SBS门限 SBS threshold | 13/16/18 dBm Adjustable | 光连接器形式 Connector | FC/APC or SC/APC | RF特性RF Parameter | 频率范围 Bandwidth | 47-862 MHz | 平坦度 Flatness | ≤±0.75 dB | 射频输入信号电平 RF input level | 75~85 dBuV | 射频输入阻抗 RF input impedance | 75Ω | 射频输入反射损耗 RF input return Loss | ≥16dB (47-550MHz) ≥14dB (550-862MHz) | 系统指标System Parameter | 载噪比C/N | ≥53dB (note 1) | CTB | ≥65dB (note 1) | CSO | ≥65dB (note 1) | 一般特性General Parameter | 电源电压 Input Voltage | 160~265 Vac | 工作温度 Operating temperature | -10~+50℃ | 尺寸 Dimensions | 423×330×45m³ |
注1测试条件：在规定的链路损耗下， 550MHz内配置59个PAL-D模拟电视频道信号， 550MHz~750/862MHz传送数字调制信号，数字调制信号电平（8MHz带宽内）比模拟信号的载波电平低10dB，光接收机输入光功率为-1dBm。 Note 1: In the prescriptive link loss,59 PAL-D analog CHs,550MHz-750/860MHz conveys digital modulated signals, digital modulated signals level (within 8MHz) is 10dB lower than analog carrier, input power of optical receiver is -1dBm. | 
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