# Optical Attenuator CBO SFA21BK5 Singlemode LC Simplex 5 dB

**URL:** https://aio.lv/en/product--blueoptics-sfa21bk5--4467307
**Data updated:** 2026-02-24 11:00 (EET)
**Category:** Fiber Optic Cables
**Manufacturer:** BlueOptics
**Manufacturer code:** SFA21BK5
**EAN:** 4063232044606
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 29.99 €
**Prices and availability valid until:** 2026-07-25 23:59
**Price without VAT (21%):** 24.79 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--blueoptics-sfa21bk5--4467307

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 23.07.2026 | free |
| Pickup points | 28.07.2026 | 1.89 EUR |
| Courier delivery to door | 28.07.2026 | 4.99 EUR |

## Summary description

CBO SFA21BK5 is a singlemode optical attenuator with LC simplex connector and 5 dB attenuation. Designed to reduce optical signal power in fiber networks, it ensures controlled loss for testing, equipment protection, and link optimization. Compact plug-in design for inline or adapter use in telecom, datacom and laboratory setups.

## Long description

The Optical Attenuator CBO SFA21BK5 Singlemode LC Simplex 5 dB is a compact inline device designed to reduce optical signal power in singlemode fiber links. It uses an LC simplex connector for straightforward insertion into patch panels, transceivers or test setups and delivers a fixed attenuation of 5 dB to control receiver input levels, protect sensitive equipment and replicate realistic link loss during measurements.
Advantages
The attenuator provides stable, predictable loss with low back reflection and consistent optical performance across singlemode wavelengths. Its plug-in form factor allows quick deployment without special tools, and the LC simplex interface ensures broad compatibility with common singlemode transceivers and patch cords. The device is compact and durable for use in rack, field and laboratory environments.
Suitable for
Adjusting receiver input power in telecom and datacom links
Protecting optical receivers and test equipment from excessive power
Performing link loss simulation and acceptance testing in laboratories
Inline attenuation in patch panels and chassis-based installations
Key specifications
Fiber type: singlemode
Connector type: LC simplex
Attenuation: fixed 5 dB
Form factor: compact plug-in attenuator for inline or adapter use
Typical return loss: designed for low back reflection in singlemode systems
How to use
Install the attenuator by inserting the LC simplex connector into the matching LC receptacle on a transceiver, adapter or patch panel, then connect the opposing fiber connector to complete the optical path. Ensure connectors are clean before mating to avoid contamination and excess loss. For testing, place the attenuator in-line between the source and measurement device to reduce optical power by the specified 5 dB. To remove, gently unplug the attenuator from the connector and protect exposed ferrules with dust caps.
Usage recommendations
Before deployment, clean both connector end-faces with appropriate fiber cleaning tools and visually inspect for contamination. Use the attenuator at the specified singlemode wavelengths and within the power handling limits of connected equipment. Store protected when not in use to maintain connector integrity.

## FAQ

### How much does the CBO SFA21BK5 Optical Attenuator Singlemode LC 5 dB cost, and is it available for purchase?

The price is 29.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 89 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

### If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on 23.07.2026 at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer. All transactions are 100% secure and encrypted.

### Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

### What is the warranty period?

All BlueOptics products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized BlueOptics service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

### Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. More information about warranty service: https://aio.lv/en/warranty

## Image

https://aio.lv/img/cache/product/4467307/59852008_large.webp