The Agilent 81521B (previously HP 81521B) is a high-performance optical power head designed for precise optical power measurements in the 850 nm to 1700 nm wavelength range. Featuring a cooled Germanium PIN diode detector and built-in non-volatile memory for calibration data, it delivers excellent sensitivity down to -80 dBm and is ideally suited for both parallel-beam and connectorized fiber optic applications.
Specifications
General
| Parameter | Value |
|---|---|
| Interfaces | Proprietary optical head interface cable to mainframe/interface module |
| Display | None (uses mainframe display) |
Physical
| Parameter | Value |
|---|---|
| Power Supply | Powered by compatible mainframe or interface module |
| Operating Temperature | 0 to 40 °C |
| Dimensions (W×H×D) | 75 mm × 28 mm × 115 mm |
| Weight | 0.5 kg |
| Cable Length | 2 m |
Optical & Sensor Specifications
| Parameter | Value |
|---|---|
| Detector Element Material | Cooled Germanium (Ge) PIN diode |
| Sensor Active Area Diameter | 5 mm |
| Wavelength Range | 900 to 1700 nm |
| Optical Power Measurement Range | +3 to -80 dBm |
| Maximum Power Density | 10 mW/mm² |
| Applicable Fiber Type | Parallel beam, 9/125 µm to 100/140 µm, NA ≤ 0.3 |
| Calibration Data Storage | On-board non-volatile memory |
Measurement Accuracy & Calibration
| Parameter | Value |
|---|---|
| Reference Calibration Uncertainty | ±2.2% (1000 to 1600 nm, at reference conditions) |
| Noise Level | <50 pW (1200 to 1600 nm) |
Compatibility & System Accessories
| Parameter | Value |
|---|---|
| Compatible Mainframe Models | HP 8153A, HP 8152A |
| Compatible Interface Modules | HP 81533B (for HP 8153A) |
Environmental & Compliance
| Parameter | Value |
|---|---|
| Storage Temperature | -40 to +70 °C |
Performance
| Parameter | Value |
|---|---|
| Maximum Safe Input Power | +10 dBm |
| Linearity | ±0.04 dB (+3 to -60 dBm at 23 °C ± 5 °C) |
| Polarization Dependence | < ±0.01 dB (typical at 1310 nm / 1550 nm) |
Environmental
| Parameter | Value |
|---|---|
| Operating Humidity | 0% to 95% R.H. (non-condensing) |
Technology
Cooled Germanium PIN Diode
Applications
Fiber optic power measurement and calibration