機架式外調製光發射機以1550nm DFB激光器為光源,採用AM-VSB殘餘邊帶調幅方式傳送信號。主要用於電視圖像信號,數字電視信號、電纜電話和數據信號的遠距離光纖傳輸,是構建大中型CATV遠距離光纖傳輸網絡的重要設備。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.特點 Features--美國JDS-U公司1550nm DFB激光器和LiNbO3外調製器--先進的RF預失真電路設計,保證良好的C/N和非線性指標--獨有的可調式SBS設計(13/16/18dBm)--微電腦自動監控電路,實時精確監控光輸出功率和激光器工作狀態--19″1U標準機架,前面板VFD顯示,實現本地監控--RS-232/485接口,方便實現網管監控--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技術參數 Technical Parameter光特性Optical Transmitter光波長Wave Length | 1550±5 nm | 光輸出口 Optical output | 2 | 光輸出功率 Optical output power | ≥7 dBm | SBS門限 SBS threshold | 13/16/18 dBm Adjustable | 光連接器形式 Connector | FC/APC or SC/APC | RF特性RF Parameter | 頻率範圍 Bandwidth | 47-862 MHz | 平坦度 Flatness | ≤±0.75 dB | 射頻輸入信號電平 RF input level | 75~85 dBuV | 射頻輸入阻抗 RF input impedance | 75Ω | 射頻輸入反射損耗 RF input return Loss | ≥16dB (47-550MHz)≥14dB (550-862MHz) | 系統指標System Parameter | 載噪比C/N | ≥53dB (note 1) | CTB | ≥65dB (note 1) | CSO | ≥65dB (note 1) | 一般特性General Parameter | 電源電壓 Input Voltage | 160~265 Vac | 工作溫度 Operating temperature | -10~+50℃ | 尺寸 Dimensions | 423×330×45m³ | 注1測試條件:在規定的鏈路損耗下, 550MHz內配置59個PAL-D模擬電視頻道信號, 550MHz~750/862MHz傳送數字調製信號,數字調製信號電平(8MHz帶寬內)比模擬信號的載波電平低10dB,光接收機輸入光功率為-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. |
|