The VENUS Series C+L-band ASE (Amplified Spontaneous Emission) broadband light sources, models VASS-CL-B (single-mode) and VASP-CL-B (polarization-maintaining), are precision-engineered instruments designed for demanding fiber-optic test, measurement, and sensing applications. Based on an optimized erbium-doped fiber architecture, these sources deliver a wide optical spectrum spanning the full C and L bands (approximately 1528–1602 nm) with high output power levels up to 200 mW, making them suitable for both research laboratories and production environments that require stable, broadband illumination.

Unlike conventional narrowband laser sources, the VENUS C+L-band ASE design provides an inherently broadband, low-coherence output ideal for minimizing interference effects and standing waves in sensitive optical setups. The source exhibits excellent spectral flatness, with variation typically kept below 3.5–4 dB across the C+L bandwidth, and low spectral ripple. This uniform power distribution over the entire operating wavelength range helps ensure accurate, repeatable measurements for applications such as DWDM component characterization, spectral analysis, and broadband insertion loss testing.

The benchtop configuration incorporates a highly integrated electronic and optical platform with a user-friendly high-definition LCD interface. Users can monitor operating current, voltage, and output power in real time, while the continuously tunable output power function allows fine adjustment to match specific experimental or production requirements. Coarse and fine power tuning modes support both quick setup and precise optimization. Designed for long-term operation, the VENUS series maintains high power stability over short (15-minute) and extended (8-hour) time scales after warm-up, even under varying ambient conditions, supporting rigorous, continuous testing cycles.

Both the VASS-CL-B and VASP-CL-B are available with a range of factory-configurable output powers, typically including 10 mW, 20 mW, 50 mW, 100 mW, and 200 mW. The standard single-mode version (VASS-CL-B) employs SMF 9/125 µm fiber, while the polarization-maintaining version (VASP-CL-B) uses PM1550 fiber with a typical polarization extinction ratio greater than 17 dB. This makes the PM model particularly well-suited for polarization-sensitive systems such as fiber gyroscopes, coherent detection setups, and certain types of interferometric sensing where stable polarization is critical.

The VENUS series is engineered for integration and flexibility. For stand-alone use, the benchtop unit offers a compact footprint of approximately 340 mm × 240 mm × 100 mm with standard FC/APC fiber connectors (other connector types can be specified). For OEMs and system builders, a compact module version is available, enabling straightforward incorporation into larger test racks, measurement systems, or field-deployable platforms. With a broad operating temperature range and low maximum power consumption, these sources are well suited for both laboratory environments and industrial test stations.

Typical application areas for the VASS-CL-B and VASP-CL-B include FBG (fiber Bragg grating) interrogation and sensing systems, where a broadband and spectrally flat source is needed to illuminate multiple gratings over long distances. They are also widely used in optical fiber gyroscope development, component and subsystem testing in C+L-band fiber communications, spectral analysis in research labs, and qualification of passive components such as multiplexers, filters, and couplers. The combination of high output power, excellent spectral flatness, and robust long-term stability makes the VENUS series a reliable backbone light source for advanced photonic testing scenarios.