# Optical attenuator CBO SFA21BK6 Singlemode LC Simplex 6 dB

**URL:** https://aio.lv/en/product--blueoptics-sfa21bk6--4467308
**Data updated:** 2026-02-25 16:32 (EET)
**Category:** Fiber Optic Cables
**Manufacturer:** BlueOptics
**Manufacturer code:** SFA21BK6
**EAN:** 4063232044613
**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-sfa21bk6--4467308

## 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 SFA21BK6 for singlemode fiber with LC simplex connector and 6 dB attenuation. Designed to reduce optical signal power by 6 decibels in fiber links, it is suitable for test setups, link power balancing and protecting receivers from overload. Compact LC simplex format enables easy integration into patch panels and equipment.

## Long description

The Optical attenuator CBO SFA21BK6 Singlemode LC Simplex 6 dB is an inline passive device designed to reduce optical signal power by 6 decibels in singlemode fiber links. It features an LC simplex connector for compact, front-panel or patch-cord integration and is suitable for test setups, optical power balancing and protecting sensitive receivers from overload. The attenuator is compatible with standard singlemode transmission wavelengths and provides a consistent attenuation level without requiring power or configuration.
Advantages
This LC simplex attenuator delivers a precise 6 dB attenuation value in a compact format, enabling straightforward insertion into existing fiber runs. The passive design means no external power is needed and the device introduces minimal additional complexity to the link. Its LC connector format and durable housing support quick installation in patch panels, adapter plates or directly on transceiver ports, while maintaining stable optical performance for routine testing and link adjustment tasks.
Suitable for
Reducing optical power to prevent receiver saturation
Balancing optical levels across fiber links and channels
Laboratory and field test setups requiring fixed attenuation
Integration into patch panels or direct connection to transceivers with LC ports
Key specifications
Attenuation: fixed 6 dB
Fiber type: singlemode
Connector format: LC simplex
Operating wavelengths: compatible with standard singlemode wavelengths (e.g., 1310 nm, 1490 nm, 1550 nm)
Insertion loss tolerance and return loss: designed for low additional loss and standard return loss performance for passive inline attenuators
Package: compact inline housing suitable for patch panel and direct-port use
How to use
Insert the attenuator inline between the transmitting fiber source and the receiving device by connecting the LC simplex ferrule to the corresponding LC connector on the patch cord or port. Ensure connectors are clean before mating to avoid contamination-related signal degradation. Once connected, the device provides a fixed 6 dB reduction in optical power; no setup or power source is required. For reversible changes, simply unplug the attenuator to restore the original signal level.
Usage recommendations
Always inspect and clean fiber connectors prior to insertion and follow standard fiber handling procedures. Use the attenuator at wavelengths and power levels appropriate for singlemode links, and avoid exceeding receiver and fiber maximum power ratings. For precise link budgeting, account for the fixed 6 dB attenuation plus any additional connector or patch-cord losses.

## FAQ

### How much does the Optical attenuator CBO SFA21BK6 Singlemode LC 6 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 — 48 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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