MU Fixed Fiber Optic Attenuator | Single-Mode | 3 dB
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SKU: CT-FAT-MU-03
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MU fixed fiber optic attenuator for single-mode links. Metal-ion doped attenuating fiber delivers flat, wavelength-stable attenuation at 1310/1550 nm — unlike air-gap designs that drift with temperature and vibration. Drops receive power into the optimal window to prevent overload errors and protect receiver photodiodes.
Applications
- OLT/ONT receiver protection on short or hot links
- PON branch power balancing
- OTDR and power-meter calibration
- DWDM channel equalization and lab benches
| Connector | MU |
| Available Values | 3 dB (1–30 dB to order) |
| Tolerance | ±0.5 dB (1–9 dB); ±1 dB (10–15 dB) |
| Max Input Power | 500 mW |
| Operating Temp | -30°C to +75°C |
Why Conversions Tech
Each unit is verified against its marked value before shipment, and our team can calculate the right dB value from your link budget. Values 1–30 dB and other connector styles available to order.
Frequently Asked Questions
When do I need a fiber optic attenuator?
When receive power is too high — short links, hot transmitters, or unbalanced PON branches. Fixed attenuators drop power to the receiver's optimal range, preventing overload errors and protecting the photodiode.
How do I choose the attenuation value?
Measure received power with a meter, compare against the receiver's specified input range, and select the dB value that centers you in that window. Common values are 5 dB for short metro links and 10–15 dB for lab and PON balancing. Our team can help you calculate it from your link budget.
Why doped-fiber attenuators instead of air-gap?
Metal-ion doped attenuating fiber delivers flat, wavelength-stable attenuation at 1310/1550 nm and does not drift with temperature or vibration the way air-gap designs can.
Lead Time: Made-to-order item. Typical lead time is 3–4 weeks from order confirmation. Call (307) 206-0534 for expedited or volume requirements, custom lengths, or connector combinations not listed.
Browse the complete line in our Fiber Optic Connectivity collection or download the full CT-31 Fiber Optic Catalog.
Why Pros Buy Direct from Conversions Tech
Engineered in the USA. Our U.S.-based engineering team designs and specifies our core product lines, and every product we carry — designed in-house or built to our exact specifications by certified partner factories — is quality-verified before it ships. UL/CSA listed where required, NEC compliant.
Cross-reference savings. Direct equivalents to Burndy, Hubbell, and other OEM part numbers at up to 30% less — same specs, same certifications, without the big-brand markup.
Real technical support. Need a torque spec, die reference, or an OEM quote? You’ll speak directly with the Conversions Tech engineering desk — not a script reader — for instant answers, custom kitting, and private-label options.
Fast US fulfillment. Orders in by 2PM ET ship same day from our US warehouse, nationwide ground and expedited.
