# Optical attenuator CBO SFA21BK25 Singlemode 25 dB

**URL:** https://aio.lv/en/product--blueoptics-sfa21bk25--4467304
**Data updated:** 2026-02-25 16:32 (EET)
**Category:** Fiber Optic Cables
**Manufacturer:** BlueOptics
**Manufacturer code:** SFA21BK25
**EAN:** 4063232044569
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 29.99 €
**Prices and availability valid until:** 2026-07-21 23:59
**Price without VAT (21%):** 24.79 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--blueoptics-sfa21bk25--4467304

## 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

Inline optical attenuator CBO SFA21BK25 for singlemode fiber with 25 dB attenuation. Designed to reduce optical power in fiber optic links, it stabilizes signal levels and protects receivers from overload. Compact and passive device suitable for testing, link balancing, and maintenance in telecom, datacom and fiber network installations.

## Long description

The Optical attenuator CBO SFA21BK25 Singlemode 25 dB is an inline passive device designed to reduce optical power levels in singlemode fiber links by 25 dB. It is intended to stabilize signal strength and prevent receiver overload in telecom, datacom and fiber network installations. The compact form factor makes it suitable for integration into patch panels, equipment racks and test setups where precise attenuation is required without introducing active components.
Advantages
This singlemode attenuator provides accurate and stable 25 dB attenuation with minimal insertion loss beyond the specified attenuation. Being a passive component, it requires no power and contributes negligible maintenance overhead. The inline design ensures simple deployment in live links or test loops, while optical-quality connectors preserve signal integrity and minimize reflections. Its compact construction supports space-efficient installation in constrained rack or enclosure environments.
Suitable for
Balancing optical link power in point-to-point singlemode networks
Protecting receiver modules from excessive optical input during equipment upgrades or testing
Temporary insertion during maintenance and commissioning of fiber links
Laboratory and field testing where a fixed 25 dB attenuation is required
Key specifications
Attenuation: 25 dB fixed value for singlemode fiber
Fiber type: singlemode
Form factor: inline attenuator suitable for patchcord integration
Passive operation: no external power required
Typical return loss: optimized to minimize back-reflection and preserve link performance
Operating environment: suitable for standard indoor telecom and datacom installations
How to use
Install the attenuator inline between two singlemode fiber connectors by inserting it into the optical path, ensuring connectors are clean and properly mated. Verify connector types and polish grades are compatible before connection. For live networks, confirm that the reduced optical power at the receiving end meets system sensitivity requirements. During testing or commissioning, use an optical power meter and light source to measure link power levels before and after insertion to validate the expected 25 dB attenuation.
Usage recommendations
Inspect and clean fiber connectors prior to installation to avoid contamination-related loss. Avoid mechanical stress or sharp bends at the attenuator interface, and store the device in a dry, dust-free environment when not in use. When used in mission-critical links, perform power measurements after installation to confirm required signal margins.

## FAQ

### How much does the Optical attenuator CBO SFA21BK25 Singlemode 25 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 — 93 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

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