The Keysight 81634A is a high-performance InGaAs optical power sensor module designed for use with the 8163A/B, 8164A/B, and 8166A/B optical mainframes. It features a large 5 mm detector diameter and offers exceptional power range, high linearity, and low noise, making it suitable for precise optical power measurements in both single-mode and multimode fiber applications.
Specifications
General
| Parameter | Value |
|---|---|
| Interfaces | None (uses mainframe interfaces: GPIB, LAN, USB) |
| Display | None (uses mainframe display) |
| Warm-up Time | 40 min |
| Recommended Calibration Interval | 2 years |
Physical
| Parameter | Value |
|---|---|
| Power Supply | Powered by mainframe backplane slot |
| Operating Temperature | 0 °C to +40 °C |
| Dimensions (W×H×D) | 75 mm × 32 mm × 125 mm |
Optical Characteristics
| Parameter | Value |
|---|---|
| Sensor Element | Indium Gallium Arsenide (InGaAs) |
| Detector Diameter | 5 mm |
| Wavelength Range | 800 nm to 1700 nm |
| Power Measurement Range | -90 dBm to +10 dBm |
| Maximum Continuous Input Power | +16 dBm (40 mW) |
| Fiber Type Compatibility | Single-mode (9/125 µm) and Multimode (up to 100/140 µm, NA ≤ 0.3) |
| Optical Return Loss | > 55 dB |
Accuracy & Calibration
| Parameter | Value |
|---|---|
| Calibration Uncertainty at Reference Conditions | ±2.5% (at 1310 nm and 1550 nm, 23 °C ±5 °C) |
| Spectral Uncertainty (1000 nm to 1600 nm) | ±3.0% |
| Spectral Uncertainty (800 nm to 1700 nm) | ±5.0% |
| Power Linearity (+10 dBm to -70 dBm) | ±0.015 dB |
| Power Linearity (-70 dBm to -80 dBm) | ±0.030 dB |
| Noise Peak-to-Peak | < 50 fW (1200 nm to 1600 nm, 1 s averaging time) |
| Zero Set | ±50 fW |
| Zero Drift | ±50 fW (over 1 hour at constant temperature) |
Measurement & Acquisition
| Parameter | Value |
|---|---|
| Averaging Time Range | 100 µs to 10 s |
| Data Logging Memory Capacity | 20,000 points |
Physical & Mechanical
| Parameter | Value |
|---|---|
| Optical Connector Adapter Type | Keysight 81000xI series (FC, SC, ST, LC, MU, bare fiber) |
| Module Slot Width | Single-slot module |
System Integration
| Parameter | Value |
|---|---|
| Compatible Mainframes | Keysight / Agilent 8163A/B, 8164A/B, 8166A/B |
Environmental
| Parameter | Value |
|---|---|
| Storage Temperature Range | -40 °C to +70 °C |
| Operating Humidity Range | 15% to 95% R.H. (non-condensing) |
Optical Performance
| Parameter | Value |
|---|---|
| Polarization Dependence | < ±0.01 dB (1250 nm to 1580 nm) |
Performance
| Parameter | Value |
|---|---|
| Spectral Ripple due to Interference | < ±0.005 dB (typically, 1460 nm to 1620 nm) |
Compliance & Standards
| Parameter | Value |
|---|---|
| EMC Compliance | EN 61326-1 |
| Safety Compliance | IEC 61010-1 / EN 61010-1 |
Technology
InGaAs Optical Power Sensor
Applications
Fiber Optic Power Measurement