Ando AQ4303B 400-1800nm White Light Source

The Ando AQ4303B is a broadband halogen lamp source spanning 400–1800 nm, engineered for precise optical loss and spectral characterization of fibers and components. It delivers ±0.05 dB output stability over one hour and operates in continuous wave or 270 Hz square wave modulated modes. A selectable built-in optical filter removes higher-order components to maintain signal purity.

GPIB control enables automated integration into test systems.

Technical Specifications

• Wavelength Range: 400–1800 nm


• Light Source: Halogen lamp


• Output Stability: ±0.05 dB (20 °C, 1 hour)


• Output Waveforms: Continuous wave or 270 Hz chopped (square wave)


• Output Level: −45 dB or greater (50/125 µm GI fiber, 850 nm and 1300 nm, 10 nm bandwidth, CW)


• Modulation Frequency: 270 Hz


• Optical Filter: Built-in, selectable by switch


• Optical Connector: FC type


• Input Voltage: AC 100 V, 50/60 Hz


• Power Consumption: Approximately 130 VA

Key Features

• High-power halogen lamp for stable broadband output across the visible and near-infrared spectrum


• Selectable 270 Hz chopper for low-level signal detection and noise rejection


• Built-in optical filter for suppression of higher-order components


• Standard GPIB interface for remote operation and system automation


• Dual output capability supports both steady-state and modulated measurements

Typical Applications

• Loss-wavelength characterization of optical fibers and devices


• Optical spectrum testing and component evaluation


• Filter and coupler performance assessment


• Fiber optic system calibration and alignment


• Research and laboratory spectroscopy

Compatibility & Integration Frequently paired with Ando/Yokogawa optical spectrum analyzers, including the AQ-6315A/B, for complete optical characterization systems. GPIB connectivity enables integration with automated test and measurement platforms.