850nm EVOA
1.DESCRIPTIONZg introduces a new miniature variable attenuator for application in either the C or L band. The attenuator offers excellent wavelength dependence and ripple, low polarization dependent loss (PDL), and improved thermal stability. The attenuator provides an economical solution to managing optical power. Reflective optics permit same-side jumper exit and enable easy panel mounting. The attenuator uses an advanced graded neutral density filter as its attenuating element. Adjustment is through a stepper motor with feedback control terminal. The driver for the stepper motor moves the motor up or down in uniform step sizes, offering fine resolution. Latching operation is a standard feature; upon removal of the drive voltage, the most recent attenuation setting is retained. An optional resistance readout for filter location purposes is available. The schematic figure of the attenuator is shown in figure 1.
Figure 1 Functional Scheme
2 . OPTIC AND/OR ELECTRIC SPECIFICATION
2.1 Optical Specifications
序列 NO. 参数 PARAMETER 规格 SPECIFICATION 单位UNITS 备注 NOTE MIN. TYP. MAX. 2.1.1 波长范围 Wavelength range 800~1100 nm 2.1.2 衰减范围 Attenuation range 30 dB 2.1.3 响应速度@3dB调整衰减分辨率 Response speed @3dB Adjust Attenuation resolution 100 ms 电压驱动方式 Driven in voltage mode 2.1.4 衰减分辨率 Attenuation resolution 0.2 dB 整步 Full Step 2.1.5 锁定稳定性 Latching stability 0.3 dB 根据电机电源开关 Based on motor power ON to OFF 2.1.6 插入损耗 Insertion loss 1.0 dB 带连接头，在波长范围内 With connector, over wavelength rang. 2.1.7 衰减线线性 Attenuation line linearity 5 % 30db@±0.5db 2.1.8 重复性 Repeatability 0.1 dB 从同一方向接近的随机位置返回到特定衰减时的衰减差异。 注：特定电压/阶跃下的衰减值可能随时间而变化，并且会随单位而变化 Difference in attenuation on return to a particular position from a random location. Note: Attenuation value at a specific voltage/step may vary with age and will vary among units 2.1.9 反冲 Backlash 0.2 dB 2.1.10 回波损耗@输入/输出 Return loss @Input/output -25 dB 带连接头 With connector 2.1.11 偏振相关损耗@输入/输出 PDL @In/Out 0.5 dB 在整个调整的波长范围内从输入端口到输出端口测量 Measured from IN to OUT ports over wavelength range @ whole adjust attenuation range 2.1.12 温度相关损耗 TDL @In/Out 0.5 dB 测量从输入到输出端口@整体调整衰减范围 Measured from IN to OUT ports @ whole adjust attenuation range 2.1.13 偏振模色散@输入/输出 PMD@In/Out 0.15 ps 2.1.14 承载光功率 Power Handling 300 mW CW
2.2 Test method
2.3 Electrical Specifications of Step Motor
序号NO. 参数 PARAMETER 规格 SPECIFICATION 单位 UNITS 备注 NOTE MIN. TYP. MAX. 2.2.1 电机类型 Motor Type 步进电机，2相位电机 Step Motor，2 Phase 2.2.2 电机电流 Motor Current 150 200 mA 2相开启 2 phase on 2.2.3 推荐直流控制电压 Recommended DC Control Voltage 3.0 3.3 3.6 V 全步进和两个线圈都是通电的 Full stepping and both coils are energized 2.2.4 每步脉冲宽度 Pulse width per step 1.25 2.0 ms 2.2.5 电机电阻 Motor Resistance 20 2.2.6 电机功耗 Motor Power Dissipation 2 W 在-5～70℃温度范围 Over -5～70℃ temperature range
3. ABSOLUTE MAXIMUM RATINGS
序号 NO 参数 PARAMETER 规格 SPECIFICATION 单位 UNITS 3.1 操作温度 Operation Temperature -5 ~ +70 °C 3.2 操作湿度 Operation Humidity 5 ~ 95 %RH 3.3 储存温度 Storage Temperature -40 ~ 85 °C
4. ELECTRIC PORTS DEFINITION
序号 NO 引脚 PIN 定义 DEFINITION 描述 DESCRIPTION 备注 NOTE 4.1 1 电机线圈A- Motor Coil A- 4.2 2 电机线圈 B Motor Coil B 4.3 3 电机线圈 B- Motor Coil B- 4.4 4 电机线圈 A Motor Coil A 4.5 5 监测信号 Monitor Signal POT电刷，可移动触点:电压传感器。 POT WIPER, Moveable POT contact: voltage pick-off. 4.6 6 监测供应+ Monitor Supply+ POT+，连接到稳定的(参考)正电源 POT+, Connect to stabilized (reference) positive supply 4.7 7 监测供应- Monitor Supply - POT-，接地 POT-, Connect to ground 4.8 8 接地 Case ground 4.9 9 无 NA 4.10 10 无 NA 4.11 11 无 NA 4.12 12 无 NA
5. MECHANICAL DRAWINGS
6. PIGTAIL AND CONNECTOR
序号 NO | 参数 PARAMETER | 规格 SPECIFICATION | 单位 UNIT | 备注 NOTE |
6.1
| 尾纤类型（所有端口） Pigtail Type(All ports) | 62.5/125um or 50/125um Multimode fiber |
| 根据客户要求 As customer’s requires |
6.2 | 尾纤长度（所有端口） Pigtail Length(All ports) | L+/- 0.1 | m | L 指 PN 中的光纤长度要求 L refers to the fiber length requirement in PN |
6.3
| 连接头类型（所有端口）Connector Type(All ports) | 根据客户要求 As customer’s requires |
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