Receiver calibration
Variable Attenuator: Known, repeatable attenuation creates controlled optical levels for linearity, sensitivity and dynamic-range measurements.
| Model | VA-C |
|---|---|
| Material | BK7grade A optical glass, Fused silica |
| Optical Density Range | OD0-OD3 |
| Outside Diameter | Φ54mm±0.25 |
| Dimension | 54*42*67mm |
| Linearity of Density | ±5%@632.8nm |
| Coating | S1:Ni-Cr-Fe; S2:Boardband AR coating; incidence angle:0°-15° |
| Clear aperture | >80% diameter |
| Damage threshold | 30W/cm 2 CW |
| Active wavelength | 400-1100 nm |
| Applicable power | <1000 mW |
| Model | VA-S |
|---|---|
| Material | BK7grade A optical glass, Fused silica |
| Optical Density Range | OD0-OD2 |
| Dimension | 76.2*25.4*2.0mm |
| Linearity of Density | OD±5% |
| Coating | S1:Ni-Cr-Fe; S2:Boardband AR coating; incidence angle:0°-15° |
| Clear aperture | >80% diameter |
| Damage threshold | 30W/cm 2 CW |
| Active wavelength | 400-1100 nm |
Specifications:
| Model | VA-P |
|---|---|
| Dimensions | Φ33 mm ×65 (L) mm |
| Wavelength | 400-1100 nm (Other wavelengths can be customized) |
| Model | ATT-45 | ATT-20 |
|---|---|---|
| Attenuation wavelength | 1.064 μm | |
| Limiting aperture | ≤ 5mm | |
| Polarization state | Suitable for P polarization | |
| Dynamic adjustment range | 0~ 4 5 dB (customizable) | 0~20 dB (customizable) |
| Step width | ≤ 1 dB | |
| Control precision | better than 0.5dB | better than 1dB |
| Damage threshold | ≥2J/cm 2 | ≥2J/cm 2 @20ns |
| Fastest adjustment speed | ≥ 3 dB/s | ≥ 1 dB/s |
| I nsertion loss | 10% | |
| Communication interface | RS 232/ 422 /485 | RS 232 |
| Power supply | DC 24V |
Application context
Why this design is used
Application fit depends on the ordered configuration; catalog values are separated from fields that still require confirmation.
Laser power stabilization
Variable Attenuator: Response time and control range determine whether the component can suppress source fluctuations without saturating the actuator.
Engineering reference
Specify Variable Attenuator from the interfaces inward
Variable Attenuator is a configurable optical attenuation or power-control component in the Laser components and accessories family. The final part number should be released only after the optical, mechanical, electrical and environmental fields below are matched to the intended instrument.
An optical attenuator or regulator controls transmitted power without changing the rest of the link. The useful configuration is set by wavelength, attenuation range, residual insertion loss, response time and whether control is manual, electrical or closed-loop.
Selection guidance describes the engineering fields that must be checked. It does not assign an option-dependent value that is absent from the catalog record.
Configuration fields to confirm
- Wavelength and fiber
- Specify the operating band, fiber mode and polarization requirement.
- Attenuation range
- State minimum insertion loss, maximum attenuation and required dynamic range.
- Accuracy and repeatability
- Define setting resolution, repeatability, linearity and acceptable drift.
- Response behavior
- Provide required switching or settling time and whether the command is step, analog or feedback controlled.
- Power handling
- Check average and peak power at minimum attenuation and during fault conditions.
- Control interface
- Confirm connector, command voltage or digital protocol, power supply and fail-safe optical state.
Qualification sequence
- 1Define the measurement objective and the performance limit that Variable Attenuator must satisfy.
- 2Freeze wavelength, mechanical, fiber and electrical interfaces before selecting option codes.
- 3Check loss, noise, heat, motion or vibration contributions in the complete system budget.
- 4Confirm the final drawing, pinout, environmental suffix and acceptance test with the quotation.
Technical FAQ
Configuration questions for Variable Attenuator
What must be specified before ordering Variable Attenuator?
Confirm wavelength and fiber, attenuation range, accuracy and repeatability, response behavior, power handling, and control interface. These fields are coupled, so the final part number should be checked against the complete instrument rather than selected from the model name alone.
How should Variable Attenuator be integrated into the system?
An optical attenuator or regulator controls transmitted power without changing the rest of the link. The useful configuration is set by wavelength, attenuation range, residual insertion loss, response time and whether control is manual, electrical or closed-loop. Freeze the optical, mechanical and electrical interfaces before releasing the surrounding assembly.
Which documentation should be approved for Variable Attenuator?
Approve the configuration-specific specification, mechanical drawing, connector or pinout definition, environmental suffix and acceptance-test limits supplied with the quotation. Any field absent from the local record remains a confirmation item, not an assumed capability.