The Keysight 81576A is a high-power Variable Optical Attenuator (VOA) module featuring an integrated power sensor, designed for single-mode fiber-optic applications in the 1200 nm to 1700 nm wavelength range. Built for compatibility with Keysight 8163A/B, 8164A/B, and 8166A/B Lightwave mainframes, it delivers precision attenuation control, low polarization dependence, high return loss, and real-time power monitoring for high-power optical component testing.
Specifications
General
| Parameter | Value |
|---|---|
| Interfaces | Controlled through host mainframe (GPIB, LAN, USB depending on mainframe configuration) |
| Display | None (uses host mainframe display) |
Physical
| Parameter | Value |
|---|---|
| Power Supply | Powered internally by the host mainframe |
| Operating Temperature | 0 °C to 40 °C |
| Dimensions (W×H×D) | 32 mm × 75 mm × 335 mm |
| Weight | 0.6 kg |
Optical Performance
| Parameter | Value |
|---|---|
| Wavelength Range | 1200 nm to 1700 nm |
| Attenuation Range | 0 dB to 60 dB |
| Attenuation Resolution | 0.001 dB |
| Minimum Insertion Loss | ≤ 1.4 dB (excluding connectors) |
| Maximum Input Power | +27 dBm |
| Polarization Dependence Loss | ≤ 0.05 dB (at 1550 nm) |
Power Sensor Performance
| Parameter | Value |
|---|---|
| Power Sensor Wavelength Range | 1200 nm to 1700 nm |
| Power Sensor Measurement Range | -50 dBm to +27 dBm |
| Power Sensor Uncertainty | ±0.11 dB (at calibration conditions) |
Physical & Mechanical
| Parameter | Value |
|---|---|
| Fiber Type | Single-mode 9/125 µm |
| Required Mainframe Slots | 1 slot |
System Compatibility
| Parameter | Value |
|---|---|
| Compatible Mainframes | Keysight 8163A/B, 8164A/B, 8166A/B |
Performance
| Parameter | Value |
|---|---|
| Calibration Wavelengths | 1310 nm, 1550 nm |
| Attenuation Accuracy | ±0.05 dB (0 to 45 dB at calibration wavelengths), ±0.15 dB (45 to 60 dB at calibration wavelengths) |
| Spectral Ripple | < ±0.01 dB (typical, 1520 nm to 1620 nm) |
| Shutter Isolation | > 80 dB |
Power Monitor
| Parameter | Value |
|---|---|
| Power Sensor Linearity | ±0.05 dB (+23 dBm to -45 dBm) |
Environmental
| Parameter | Value |
|---|---|
| Storage Temperature Range | -40 °C to +70 °C |
| Operating Humidity Range | 15% to 95% R.H. (non-condensing) |
Optical Interface
| Parameter | Value |
|---|---|
| Connector Interface | Keysight 81000xI series (requires 2) |
Technology
Fiber-optic
Applications
Optical transceiver testing, receiver sensitivity analysis, high-power optical component characterization