SC/APC Single Mode Fixed Fiber Optic Attenuator, Male to Female, 1-25dB

Selection starts with the actual optical interface and ends with verification of the delivered configuration. SC/APC Single Mode Fixed Fiber Optic Attenuator inserts a precisely calibrated fixed loss into a fiber channel. The attenuating element is ion-doped fiber - the loss is spectrally flat and reflection-free, unlike air-gap or offset designs - so the channel sees exactly the rated attenuation at every operating wavelength. The male-to-female plug body attaches directly to the relevant panel adapter or transceiver port, adding attenuation without an extra patch cord in the channel.

Product Highlights

• Standard Fixed Attenuation Values of 1dB up to 25dB
• Applied for CWDM, DWDM, Test Equipment, CATV Systems, Point to Point Systems, etc.
• Attenuating Material-ion Doped Fiber
• 1260 to 1620nm Wavelength Singlemode Attenuators
• Precision Polishing for Reduced Back Reflection

The SC/APC fixed attenuator is available across the full standard range: 1dB, 2dB, 3dB, 4dB, 5dB, 6dB, 7dB, 8dB, 9dB, 10dB, 11dB, 12dB, 13dB, 14dB, 15dB, 16dB, 17dB, 18dB, 19dB, 20dB, 21dB, 22dB, 23dB, 24dB, 25dB. Every value is individually calibrated at 1310 nm and 1550 nm and the rated figure is marked on each housing, so the ordered value is exactly the installed value. State the required figure - for example SC/APC 10dB - with the enquiry.

1dB   2dB   3dB   4dB   5dB   6dB   7dB   8dB   9dB   10dB   11dB   12dB   13dB   14dB   15dB   16dB   17dB   18dB   19dB   20dB   21dB   22dB   23dB   24dB   25dB

Beyond live links, attenuators are the reference instruments of the fiber lab. Receiver sensitivity is measured by adding loss until errors appear; power meters are calibrated against known attenuation figures; a new transceiver type is qualified across its receive range before rollout. Fixed attenuators provide the stable reference points, and variable attenuators sweep the range between them. Both must hold their rated rating over wavelength and temperature, which is what separates a calibrated device from a decorative one.

An attenuator that reads 10 dB at 1310 nm but 12 dB at 1550 nm is a measurement error waiting to happen. The ion-doped element in these attenuators is engineered for spectral flatness across the full 1260 to 1620 nm window, covering every common operating wavelength from legacy 1310 nm links through DWDM C-band and L-band systems. One device therefore serves the whole plant instead of one wavelength plan. Include this check in the site record used for commissioning and maintenance.

Fixed attenuators win on stability, size and price: once the intended 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 rating is the whole point. Most plants need both: fixed units existing in the links, and a variable instrument in the test kit.

The right rating is the difference between what the channel delivers and what the receiver wants, plus a small margin. Measure or calculate the expected receive power first; then establish the nearest standard rating - 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 need sits between standard figures, the custom-built platform covers the specific figure.

The plug-style body turns the attenuator into a connector accessory rather than a cable product: the male end seats directly in the relevant panel adapter or the transceiver port, and the installed patch cord mates to the female end. No extra jumper, no extra mating pair, no extra loss beyond the rated rating. In dense frames this matters twice - once in the loss calculation, and once in the relevant cable management behind the relevant panel.

An attenuator sits in the middle of the channel; as a result, 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 compatible with the plant: an APC attenuator mated to a UPC connector through an adapter damages both end faces and destroys the very return loss it was selected to protect.

An attenuator is a connector with optics inside, and connector rules apply: keep the caps on until the moment of mating, clean every 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 channel each existing unit serves so replacement orders match the original rating.

Four decisions define the order: the attenuation rating must be compatible with the channel calculation, the relevant connector range must be compatible with the port or the leads, the polish grade must be compatible with the plant, and the body style - plug or inline - must suit the installation. Fixed figures 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 channel.

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

Refer to this attenuator by attenuation rating, connector range, polish grade and body style when requisitioning a quotation. For figures or configurations outside the listed options - non-standard dB figures, mixed connector pairings or project packaging - send the need with the inquiry and the factory will cross-check the manufacturable specification. Huihong Technologies can review the selection and customization details before confirming supply.