The Agilent 81624B is a high-performance InGaAs optical power head designed for precise fiber optic power measurements. Featuring a large 5 mm active area sensor, it provides excellent optical characteristics including exceptionally low polarization dependence (PDL) and high return loss. The head is designed for operation with Agilent/Keysight 8163, 8164, and 8166 series mainframes via compatible interface modules.
Specifications
General
| Parameter | Value |
|---|---|
| Interfaces | Proprietary connector to 81618A/81619A interface modules |
| Display | None (uses mainframe display) |
Physical
| Parameter | Value |
|---|---|
| Power Supply | Powered via interface module from mainframe |
| Operating Temperature | 0 °C to +40 °C |
| Dimensions (W×H×D) | 80 mm × 55 mm × 50 mm |
| Weight | 0.25 kg |
Optical & Performance Specifications
| Parameter | Value |
|---|---|
| Sensor Material | InGaAs (Indium Gallium Arsenide) |
| Active Area Diameter | 5 mm |
| Wavelength Range | 800 nm to 1700 nm |
| Power Measurement Range | -90 dBm to +10 dBm |
| Maximum Safe Input Power | +16 dBm |
| Calibration Wavelength Range | 800 nm to 1700 nm |
| Polarization Dependence (PDL) | < ±0.005 dB (typically < ±0.002 dB) within 1250 nm to 1600 nm |
| Spectral Ripple (due to interference) | < ±0.005 dB (typical) |
| Maximum Numerical Aperture (NA) | 0.3 |
| Fiber Type Compatibility | Single-mode (SM) and Multi-mode (MM) up to 100 µm core diameter |
Measurement Accuracy & Linearity
| Parameter | Value |
|---|---|
| Absolute Power Uncertainty (Reference Conditions) | ±2.2% at 1310 nm and 1550 nm |
| Absolute Power Uncertainty (1000 to 1630 nm) | ±3.0% at reference conditions |
| Absolute Power Uncertainty (800 to 1000 nm / 1630 to 1700 nm) | ±5.0% at reference conditions |
| Total Operating Power Uncertainty (1000 to 1630 nm) | ±4.0% (-70 dBm to +10 dBm) |
| Power Linearity (1200 to 1630 nm) | < ±0.015 dB (-70 dBm to +10 dBm) |
| Zeroing Offset | < 2.5 pW |
| Temperature Dependence of Calibration Factor | ±0.04% / K (typical, at 1310 nm / 1550 nm) |
| Reference Conditions | 23 °C ± 5 K, power level -20 dBm, SM fiber 9/125 µm, NA ≤ 0.1 |
Speed, Sampling & Signal Processing
| Parameter | Value |
|---|---|
| Minimum Averaging Time | 100 µs |
Optical Interface & Connectivity
| Parameter | Value |
|---|---|
| Input Aperture Diameter | 5 mm |
| Interface Cable Length | 2 m |
| Connector Type to Interface Module | D-Sub connector |
| Compatible Thread Type for Adapters | Agilent 8162x adapter thread |
Environmental & Regulatory Compliance
| Parameter | Value |
|---|---|
| Storage Temperature Range | -40 °C to +70 °C |
| Operating Humidity Range | 15% to 95% R.H., non-condensing |
| Recommended Calibration Interval | 2 years |
System Integration & Compatibility
| Parameter | Value |
|---|---|
| Compatible Mainframes | Agilent / Keysight 8163A, 8163B, 8164A, 8164B, 8166A, 8166B |
| Compatible Interface Modules | Agilent / Keysight 81618A (Single Channel), 81619A (Dual Channel) |
Performance
| Parameter | Value |
|---|---|
| Noise Peak-to-Peak (1200 to 1600 nm) | < 20 pW (constant temperature, 1 s averaging time, 3σ) |
| Noise Peak-to-Peak (800 to 1700 nm) | < 50 pW (constant temperature, 1 s averaging time, 3σ) |
Operating Conditions
| Parameter | Value |
|---|---|
| Warm-up Time | 40 min |
Calibration
| Parameter | Value |
|---|---|
| Individual Calibration Wavelengths | 850 nm, 1300 nm, 1310 nm, 1490 nm, 1550 nm, 1625 nm |
Technology
InGaAs (Indium Gallium Arsenide)
Applications
Optical power measurement and fiber optic testing