# Optical attenuator CBO SFA21BK9 Singlemode LC Simplex 9 dB

**URL:** https://aio.lv/en/product--blueoptics-sfa21bk9--4467311
**Data updated:** 2026-02-25 16:32 (EET)
**Category:** Fiber Optic Cables
**Manufacturer:** BlueOptics
**Manufacturer code:** SFA21BK9
**EAN:** 4063232044644
**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-sfa21bk9--4467311

## 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 SFA21BK9 provides a fixed 9 dB signal attenuation for singlemode fiber links. With an LC simplex connector it fits standard LC ports and is intended for use in fiber optic networks, testing, or power-level adjustment between transmitters and receivers. Compact, passive device requiring no power, it helps prevent receiver overload and ensures correct signal levels for reliable data transmission.

## Long description

Optical attenuator CBO SFA21BK9 Singlemode LC Simplex 9 dB is a compact, passive inline device that provides a fixed 9 dB reduction of optical power for singlemode fiber links. Designed with an LC simplex connector, it fits standard LC ports and is intended to balance power levels between transmitters and receivers, protect sensitive receiver inputs from overload, and support testing and commissioning tasks in fiber optic networks.
Advantages
The attenuator offers stable, repeatable attenuation without requiring power or configuration and maintains low insertion loss and back reflection suitable for singlemode systems. Its LC simplex interface ensures simple plug-and-play installation in existing patch panels and transceiver ports. The compact housing and passive design reduce points of failure and simplify inventory for installation and test engineers.
Suitable for
 Balancing optical power between singlemode transmitters and receivers
 Preventing receiver saturation in high-power links
 Field testing and laboratory calibration of fiber links and transceivers
 Temporary insertion during network commissioning or maintenance
Key specifications
 Attenuation: fixed 9 dB
 Fiber type: singlemode
 Connector type: LC simplex
 Design: inline, passive (no external power required)
 Typical return loss: compatible with singlemode communication requirements
 Form factor: compact inline adapter for patch cords and transceivers
How to use
Insert the LC simplex connector of the attenuator between the transmitting or receiving device and the fiber patch cord or transceiver port. Ensure connectors are clean before mating to avoid contamination-related loss. The device is polarity-preserving and does not require configuration; once inserted it will reduce the optical power by the specified 9 dB continuously. Remove and store the attenuator in protective caps when not in use to protect connectors.
Usage recommendations
Use the attenuator when measured received power exceeds the receiver’s maximum input level or during test procedures to simulate longer fiber runs. For laboratory or production environments, verify optical power levels with a calibrated power meter after insertion. Avoid using the same attenuator in multimode links; select singlemode attenuators for singlemode systems to ensure correct optical performance.

## FAQ

### How much does the Optical attenuator CBO SFA21BK9 LC Simplex 9 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 — 55 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/4467311/66005433_large.webp