SPL Photonics Variable Optical Attenuator (VOA) – Electronically Controlled, Precision-Grade
| Origin | Canada |
|---|---|
| Manufacturer Type | Authorized Distributor |
| Origin Category | Imported |
| Model | SPL-VOA Series |
| Pricing | Available Upon Request |
| Component Category | Light Source Accessory |
| Compliance | RoHS, CE |
Overview
The SPL Photonics Variable Optical Attenuator (VOA) is a precision electro-optic component engineered for stable, repeatable, and wavelength-agnostic attenuation of optical power in free-space or fiber-coupled configurations. Based on solid-state liquid crystal or MEMS-based actuation (model-dependent), it operates via analog voltage or digital command input to modulate transmission continuously across a defined dynamic range. Unlike mechanical or manual wedge-based attenuators, this electronically controlled VOA eliminates mechanical hysteresis and drift, delivering high reproducibility (< ±0.05 dB repeatability over 1,000 cycles) and sub-millisecond response time—critical for real-time feedback loops in laser stabilization, optical coherence tomography (OCT) reference arm balancing, and photonic integrated circuit (PIC) characterization. Designed for integration into OEM systems and research-grade optical benches, the device maintains polarization insensitivity (typical PDL < 0.1 dB) and low back-reflection (< −40 dB), ensuring minimal interference with upstream sources such as single-frequency lasers or supercontinuum sources.
Key Features
- Electronically tunable attenuation range: 0–60 dB (typical, model-specific), with linear or logarithmic control response
- Analog (0–5 V / 0–10 V) and digital (RS232, USB, or optional TTL-compatible) interface options for system integration
- Wavelength coverage: 400–1700 nm (broadband version); narrowband variants available for 780 nm, 1064 nm, or 1550 nm optimization
- Insertion loss < 1.2 dB at minimum attenuation; maximum power handling up to 500 mW (CW) with optional heat-sink mounting
- Hermetically sealed aluminum housing with standard SM1 (1.035″-40) or FC/PC fiber port options; compatible with Thorlabs, Newport, and Standa optical mounts
- Calibration traceable to NIST-traceable optical power standards; supplied with individual attenuation vs. voltage lookup table
Sample Compatibility & Compliance
The SPL VOA supports both free-space collimated beams (1–3 mm diameter) and single-mode/multimode fiber inputs (SMF-28, HI1060, or MMF 50/125 µm). It is suitable for use with continuous-wave (CW) lasers, pulsed lasers (with pulse energy < 10 µJ and repetition rate < 100 kHz), and broadband sources including supercontinuum and LED-based illumination. The device complies with IEC 61300-2-41 (fiber optic connector durability) and IEC 60825-1 (laser product safety) requirements. All units undergo 100% functional testing per ISO/IEC 17025-accredited internal procedures and are certified RoHS-compliant and CE-marked for EMC (EN 61326-1) and safety (EN 61010-1).
Software & Data Management
SPL provides a cross-platform configuration utility (Windows/macOS/Linux) supporting real-time attenuation monitoring, scriptable control via Python SDK (PyVISA-compatible), and logging of timestamped power readings with user-defined metadata. The software enables automated calibration curve generation and supports export to CSV, HDF5, or MATLAB .mat formats. For regulated environments, optional firmware upgrade adds audit trail functionality compliant with FDA 21 CFR Part 11 requirements—including electronic signatures, change history, and role-based access control—making it suitable for GLP/GMP-aligned optical test protocols.
Applications
- Laser power stabilization in interferometric metrology and gravitational wave detector alignment subsystems
- Dynamic gain control in erbium-doped fiber amplifier (EDFA) test benches and optical network simulation platforms
- Reference arm intensity matching in swept-source and spectral-domain OCT systems
- Quantum optics experiments requiring precise photon flux regulation (e.g., heralded single-photon source conditioning)
- Calibration of photodetectors, power meters, and camera-based beam profilers across multiple irradiance levels
- Teaching laboratories for hands-on study of optical signal-to-noise ratio (SNR) degradation, dynamic range limits, and detector linearity
FAQ
What is the typical attenuation resolution and accuracy?
Resolution is 0.01 dB (12-bit DAC equivalent); absolute accuracy is ±0.15 dB over the full 0–60 dB range at 1550 nm, verified at factory calibration.
Can this VOA be used with pulsed lasers?
Yes—provided peak power density remains below 1 MW/cm² and average power does not exceed thermal limits. Pulse duration > 1 ns is recommended to avoid nonlinear effects.
Is polarization-dependent loss (PDL) characterized per unit?
Yes—each unit ships with a measured PDL value (typically ≤ 0.08 dB) recorded in its calibration certificate.
Do you offer OEM volume pricing and custom firmware?
Yes—custom pinouts, embedded microcontroller interfaces (I²C/SPI), and application-specific firmware are available under NDA for qualified OEM partners.
What is the warranty and repair policy?
Standard 24-month limited warranty; extended service plans and depot-level recalibration (traceable to NRC Canada) are available upon request.
