The Keysight (Agilent) 81657A is a dual-wavelength Fabry-Perot (FP) laser source module designed for use with the Keysight 8163A/B, 8164A/B, and 8166A/B mainframe systems. Operating at 1550 nm and 1625 nm, it provides a stable and reliable optical signal for testing single-mode optical fibers and passive components. Its compact, single-slot design and interchangeable connector interface make it a versatile tool for telecom and optical fiber research and manufacturing environments.
Specifications
General
| Parameter | Value |
|---|---|
| Interfaces | System integrated via mainframe backplane (GPIB, LAN, USB depending on mainframe) |
| Display | None (monitored via mainframe display interface) |
Physical
| Parameter | Value |
|---|---|
| Power Supply | Powered by host mainframe |
| Operating Temperature | 0 °C to 45 °C |
| Dimensions (W×H×D) | 32 mm × 75 mm × 236 mm |
| Weight | 0.5 |
Wavelength Characteristics
| Parameter | Value |
|---|---|
| First Center Wavelength | 1550 nm ± 20 nm |
| Second Center Wavelength | 1625 nm ± 15 nm |
| Spectral Bandwidth (FWHM) | < 15 nm (typical) |
Optical Power Characteristics
| Parameter | Value |
|---|---|
| Short-term Power Stability | ±0.02 dB (15 min at constant temperature) |
| Long-term Power Stability | ±0.05 dB (24 h at constant temperature) |
Polarization & Fiber Specifications
| Parameter | Value |
|---|---|
| Output Fiber Type | 9/125 µm Single-Mode Fiber (SMF) |
| Optical Connector Interface | Keysight 81000xI series (user-exchangeable: FC, SC, ST, etc.) |
Modulation Capabilities
| Parameter | Value |
|---|---|
| Internal Modulation Frequencies | 270 Hz, 350 Hz, 1 kHz, 2 kHz |
| Internal Modulation Duty Cycle | 50% (nominal) |
System Integration & Software
| Parameter | Value |
|---|---|
| Mainframe Compatibility | Agilent / Keysight 8163A/B, 8164A/B, 8166A/B |
| Required Slots | 1 mainframe slot |
| SCPI Command Support | Yes, via mainframe host |
Physical & Power Specifications
| Parameter | Value |
|---|---|
| Warm-up Time | 1 hour |
Environmental & Safety Compliance
| Parameter | Value |
|---|---|
| Laser Safety Class | Class 1M |
| Storage Temperature Range | -40 °C to +70 °C |
| Operating Humidity Range | Non-condensing |
Optical Specifications
| Parameter | Value |
|---|---|
| Laser Type | Fabry-Perot (FP) |
| Number of Optical Outputs | 1 (shared port) |
Technology
Fabry-Perot (FP) Laser
Applications
Optical fiber testing, telecom component verification, insertion loss measurement
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