The Johansson 4061 is a fixed inline optical attenuator providing precisely 10 dB of signal reduction for single-mode fiber systems. It uses an SC/APC connector interface, making it directly compatible with the SC/APC ports found on optical nodes, amplifiers, and splitters in FTTH and CATV fiber distributions.

The 4061 is used to bring overdriven input levels into the optimal operating range of downstream equipment, preventing saturation and maintaining signal integrity across the fiber link.

Key Features

• Fixed 10 dB attenuation level with ±0.5 dB accuracy
• SC/APC connector on both ends for low-reflection termination
• Single-mode fiber compatibility across the full C- and L-band window
• Operating wavelength range of 1260–1650 nm covers all common FTTH and CATV wavelengths
• Return loss greater than 65 dB — minimises back-reflection into laser sources
• Polarisation dependent loss below 0.2 dB
• Maximum optical input power of 200 mW

Product Benefits

• Precise fixed attenuation prevents receiver saturation without active components
• High return loss protects upstream laser sources from reflected signal damage
• Low polarisation dependent loss ensures consistent performance regardless of fibre orientation
• Compact inline form factor installs directly between any two SC/APC connections

Technical Specifications

• Attenuation Level: 10 dB
• Connector Type: SC/APC
• Cable Type: Single Mode
• Operating Wavelength: 1260–1650 nm
• Return Loss: >65 dB
• Attenuation Accuracy: ±0.5 dB
• Polarisation Dependent Loss: <0.2 dB
• Maximum Optical Input Power: 200 mW
• Operating Temperature: -40 to +85 °C

Why You'll Love It

• No power supply needed — passive device that installs in seconds
• Wide operating temperature range suits both indoor equipment racks and outdoor enclosures
• Eliminates the need for variable attenuators in fixed-loss link budget applications
• SC/APC interface is the industry standard for low-reflection CATV and FTTH nodes