Single-mode fiber optic attenuator models and specifications

Single-mode fiber optic attenuators are available in fixed and variable types, with attenuation ranges from 1 dB to 60 dB, supporting various connectors and operating wavelengths.

Fixed Attenuators

Thorlabs offers single-mode fixed fiber optic attenuators with FC/PC or FC/APC connectors. These attenuators are polarization-insensitive and operate over a wavelength range of 1240–1620 nm. They feature a 2.2 mm wide key female input and a 2.0 mm narrow key male output, compatible with both narrow and wide key connectors, and include connector caps for protection (Thorlabs) . Newport provides single-mode fixed attenuators with low return loss and high mode stability. Available attenuation values include 3, 5, 10, 15, and 20 dB. Newport's F-ADAT series is optimized for 1310 nm or 1550 nm operation with ±40 nm bandwidth. Attenuation accuracy is <±1 dB for values under 10 dB and <±10% for higher values. Connector options include FC/PC and FC/APC, with male-to-female configurations for easy insertion into optical paths (Newport) . Datatronix offers single-mode attenuators in LC, SC, FC UPC/APC, and MU UPC connectors, with attenuation from 1 dB to 30 dB in 1 dB increments. These attenuators provide accurate attenuation and low return loss across a wide wavelength range, suitable for patch cord or adaptor insertion (Datatronix) .

Variable Attenuators

FS supplies both fixed and variable fiber optic attenuators with attenuation ranges from 0 to 60 dB, suitable for WDM transmission. Variable attenuators allow fine-tuning of optical power levels to match system requirements (FS) . Fibertronics provides adjustable in-line attenuators using an air gap mechanism, available with ST or FC connectors. Their variable attenuators allow precise control of attenuation and can be customized for specific fiber lengths and connector types. They also offer male-to-female pad-style attenuators for single-mode 9/125 µm fibers (Fibertronics) .

Key Considerations

• Connector Type: FC, FC/APC, SC, SC/APC, LC, LC/APC, ST, MU
• Attenuation Range: 1–60 dB depending on model and type
• Wavelength Compatibility: Commonly 1240–1620 nm, with specific models optimized for 1310 nm or 1550 nm
• Form Factor: In-line, adaptor-type, or pad-style
• Performance Metrics: Low return loss, polarization-insensitive, and high mode stability These models cover a wide range of applications in optical communication, testing, and WDM systems, allowing users to select attenuators based on required attenuation, connector compatibility, and wavelength range.