LC/SC/FC/ST/LSH Single Mode Fixed Fiber Optic Attenuator, Female to Female, 3-15dB

For procurement and engineering teams, the specification provides a practical basis for checking compatibility before production is requested. LC/SC/FC/ST/LSH Single Mode Fixed Fiber Optic Attenuator inserts a precisely calibrated fixed loss into a fiber connection. The attenuating element is ion-doped fiber - the loss is spectrally flat and reflection-free, unlike air-gap or offset designs - so the connection sees exactly the rated attenuation at each operating wavelength. The female-to-female body works inline between two standard patch patch cords, adding attenuation without disturbing the optical interface plan of the plant.

Product Highlights

• Available in a Variety of Connector Types
• Standard Fixed Attenuation Values of 3/5/7/10/15dB
• Applied for CWDM, DWDM, Test Equipment, CATV Systems, Point to Point Systems, etc.
• Attenuating Material-ion Doped Fiber
• 1260 to 1620nm Wavelength Singlemode Attenuators

This female-to-female attenuator is stocked in the standard inline values: 3dB, 5dB, 7dB, 10dB, 15dB. Each value is individually calibrated and marked on the housing.

3dB   5dB   7dB   10dB   15dB

Optical links are engineered with a power budget: the transmitter launches, the fiber and connectors consume, and the receiver expects what remains inside a defined window. Short routes, dense wavelength plans and high-power transmitters can all deliver too much light, and an overloaded receiver distorts exactly like an overloaded amplifier - errors appear on a connection that tests perfectly on loss alone. A fixed attenuator brings the received power back inside the window, and the connection behaves as designed.

The cleanest way to attenuate light is to absorb it inside the fiber itself. Ion-doped fiber attenuators do exactly that: a short section of doped glass absorbs a calibrated fraction of the optical power and converts it to negligible heat. Because the attenuation happens inside the core, the light that emerges keeps its mode profile and the device adds virtually no reflectance. The alternatives - air gaps, offsets and misaligned ferrules - all trade loss against reflections and modal noise, which is why precision attenuators abandoned them. Include this point in the technical enquiry and final installation checklist.

The right figure is the difference between what the connection delivers and what the receiver wants, plus a small margin. Measure or calculate the expected receive power first; then pick the nearest standard figure - 1, 2, 3, 5, 7, 10, 15, 20 or 25 dB - that lands the receiver inside its window. Too little attenuation leaves the receiver overloaded; too much eats the margin that aging and repairs will need later. When the specification sits between standard specifications, the custom-built platform covers the precise figure.

Fixed attenuators win on stability, size and price: once the project-specific loss is known, a fixed device holds it permanently with no moving parts. Variable attenuators win when the loss itself is the question - receiver sensitivity testing, margin surveys, multi-wavelength leveling - where sweeping the figure is the whole point. Most plants need the two: fixed units current in the links, and a variable instrument in the test kit.

The female-to-female body sits between two standard patch patch cords like a coupler with a calibrated loss. That format suits test setups and temporary installations where the attenuator moves between links, and plants where the optical interface plan is fixed and the attenuation must be added inline. Either way, the attenuation figure, not the gender, is what the connection sees.

An attenuator sits in the middle of the connection, and therefore its reflectance counts twice - once toward the transmitter and once toward the receiver. UPC versions hold return loss at 50 dB or better, and APC versions at 60 dB or better, which keeps reflected power far below anything a modern transmitter notices. The polish grade must be aligned with the plant: an APC attenuator mated to a UPC connector through an adapter damages the two end faces and destroys the very return loss it was specified to protect.

An attenuator is a connector with optics inside, and connector rules apply: keep the caps on until the moment of mating, clean each end face before insertion, and never mate a contaminated ferrule into the device - the dirt transfers to the attenuator end face and the next connector that touches it. Store spare units capped and bagged, and record which connection every current unit serves so replacement orders match the original figure.

Four decisions define the order: the attenuation figure must be aligned with the connection calculation, the optical interface series must be aligned with the port or the patch cords, the polish grade must be aligned with the plant, and the body style - plug or inline - must suit the installation. Fixed specifications cover permanent installations; the variable instruments cover testing; the test cable covers transceiver qualification. Getting all four right at order time is what turns a small component into a dependable part of the connection.

Each attenuator is optically verified before packing: the attenuation figure is measured at the operating wavelengths and checked against its rated tolerance, return loss is verified to its polish grade, and the optical interface end faces are inspected for scratches and contamination. Units ship capped and bagged.

Refer to this attenuator by attenuation figure, connector series, polish grade and body style when specifying a quotation. For specifications or configurations outside the listed options - non-standard dB figures, mixed connector pairings or project packing - send the specification with the request and the factory will make certain of the manufacturable specification. A clear port or maintenance schedule helps us confirm the correct factory-built configuration before supply.