# Optical attenuator CBO SFA21BK20 Singlemode LC Simplex 20 dB

**URL:** https://aio.lv/en/product--blueoptics-sfa21bk20--4467303
**Data updated:** 2026-02-25 16:32 (EET)
**Category:** Fiber Optic Cables
**Manufacturer:** BlueOptics
**Manufacturer code:** SFA21BK20
**EAN:** 4063232044552
**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-sfa21bk20--4467303

## 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 SFA21BK20 is a fixed optical attenuator for singlemode fiber with LC simplex connector and 20 dB attenuation. Designed to reduce signal power in fiber-optic links, it helps prevent receiver saturation and test setups requiring precise loss. Compact LC simplex housing enables easy inline insertion in telecommunication, datacom and testing environments.

## Long description

The BlueOptics Optical attenuator CBO SFA21BK20 Singlemode LC Simplex 20 dB is a fixed in-line device for reducing optical signal power in singlemode fiber links. It features an LC simplex connector and provides a nominal 20 dB attenuation to protect receivers from overload, to match power levels in transmitter–receiver pairs, or to create defined loss conditions in test and measurement setups. The compact LC simplex housing allows easy insertion into patch panels, fiber cords, or test leads without additional adapters.
Advantages
This fixed attenuator delivers a stable 20 dB attenuation with repeatable performance and low back reflection suitable for singlemode systems. The LC simplex form factor keeps installation space minimal and enables direct in-line use with standard LC-terminated fibers. Its robust housing provides reliable mechanical protection for the attenuating element while maintaining consistent optical characteristics across typical telecommunication and datacom environments.
Suitable for
Reducing optical power to prevent receiver saturation in singlemode networks
Balancing transmitter and receiver power levels during link commissioning
Creating defined loss for optical test, measurement, and calibration
Temporary insertion in patch panels, distribution frames, or test leads
Key specifications
Fiber type: singlemode
Connector type: LC simplex
Nominal attenuation: 20 dB
Form factor: in-line fixed attenuator
Typical application: telecommunication, datacom, laboratory testing
How to use
Insert the attenuator directly between two LC-terminated fiber connectors, ensuring clean connector endfaces before mating. Align and gently push the LC connector into the mating adapter or connector until it latches; avoid excessive force. For test measurements, install the attenuator in the measurement path and allow the system to stabilize before recording power values. When not in use, protect the connector ends with dust caps to prevent contamination.
Usage recommendations
Inspect and clean LC connectors prior to use, verify the required 20 dB attenuation for your link budget, and avoid repeated rough handling to maintain stable optical performance.

## FAQ

### How much does the Optical attenuator CBO SFA21BK20 20 dB LC 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 — 96 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/4467303/59849418_large.webp