# SFP BiDi Transceiver Lightwin 1.25 Gbit 1550nmTX/1310nmRX 40km DDM LC-Simplex Singlemode DFB

**URL:** https://aio.lv/en/product--lightwin-lwo-sfp-5531-40--12368276
**Data updated:** 2026-04-21 17:33 (EEST)
**Category:** Network Media Converters
**Manufacturer:** Lightwin
**Manufacturer code:** LWO-SFP-5531-40
**EAN:** 9120117656882
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 47.49 €
**Prices and availability valid until:** 2026-07-23 23:59
**Price without VAT (21%):** 39.25 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--lightwin-lwo-sfp-5531-40--12368276

## 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

Lightwin 1.25 Gbit SFP BiDi fiber optic transceiver with 1550 nm TX and 1310 nm RX wavelengths, designed for singlemode links up to 40 km. Features LC-simplex connector, DFB laser, DDM support and 3.3 V input. Suited for point-to-point telecom and network applications requiring BiDi SFP modules and long-reach singlemode connectivity.

## Long description

Lightwin 1.25 Gbit SFP BiDi transceiver providing 1550 nm transmit and 1310 nm receive wavelengths in a compact SFP package with an LC-simplex connector. Designed for singlemode fiber links up to 40 km, this module uses a DFB laser and supports Digital Diagnostic Monitoring (DDM) with a +3.3 V single power supply. It is intended for point-to-point telecom and network applications that require bidirectional SFP connectivity and long-reach singlemode performance.
Advantages
The module integrates a DFB transmitter and PIN photodetector pair for stable long-distance singlemode transmission and supports LVPECL-compatible data I/O for reliable signal interfacing. Low electromagnetic interference (EMI), built-in ESD protection and compliance with laser safety standard IEC-60825 make it suitable for deployed network environments. The compact SFP form factor with LC simplex connector simplifies installation in standard SFP ports.
Suitable for
Point-to-point metro and access links over singlemode fiber
Network equipment requiring BiDi SFP modules for fiber count reduction
Long-reach connections up to 40 km in telecom and campus networks
When it may not be suitable
This transceiver is designed for singlemode fiber and will not work on multimode fiber without appropriate media conversion. It supports up to 1.25 Gbit/s; it is not suitable for networks requiring higher data rates such as 10 Gbit/s or above.
Key specifications
Data rate: up to 1250 Mbit/s
Transmit wavelength: 1550 nm (DFB laser)
Receive wavelength: 1310 nm (PIN photodetector)
Maximum reach: 40,000 m (40 km) over singlemode fiber
Connector: LC simplex
Power supply: +3.3 V single supply
Data interface: LVPECL compatible
Standards: IEC-60825 laser safety compliant; RoHS compatible; SFF-8472 compatible
How to use
Install the SFP BiDi transceiver into an SFP slot of a compatible switch, router or media converter, making sure the module is fully seated and latched. Connect a singlemode LC-simplex fiber patch cable with the correct polarity for bidirectional operation (1550 nm TX to corresponding RX side). Power the host device with a stable +3.3 V supply and verify link status and DDM diagnostics through the host management interface as needed.
What to consider before purchase
Ensure your equipment supports SFP modules and the LVPECL-compatible interface
Confirm the link distance is within 40 km over singlemode fiber
Verify you require 1550 nm TX / 1310 nm RX bidirectional operation rather than parallel fiber transceivers
Usage recommendations
For reliable long-reach BiDi links, use quality singlemode LC-simplex patch cords, avoid tight bends in the fiber run, and verify DDM readings after installation to confirm optical power and module temperatures are within acceptable ranges.

## Specifications

| Feature | Value |
|---|---|
| Interface type | BiDi SFP |
| SFP transceiver type | Fiber optic |
| Single-mode fiber (SMF) supported | Yes |

### Network

| Feature | Value |
|---|---|
| Maximum data transfer rate | 1250 Mbit/s |

### Ports & interfaces

| Feature | Value |
|---|---|
| Fiber optic connector | LC |

### Technical details

| Feature | Value |
|---|---|
| Warranty period | 3 year(s) |

### Performance

| Feature | Value |
|---|---|
| Maximum transfer distance | 40000 m |
| Link budget | -22 dB |
| Rx wavelength (max) | 1560 nm |
| Rx wavelength (min) | 1540 nm |
| Tx wavelength (min) | 1540 nm |
| Tx wavelength (max) | 1560 nm |

### Power

| Feature | Value |
|---|---|
| Input voltage | 3.3 |

### Certificates

| Feature | Value |
|---|---|
| Compliance certificates | RoHS |

### Operational conditions

| Feature | Value |
|---|---|
| Operating relative humidity (H-H) | 5 - 95 |
| Operating temperature (T-T) | 0 - 70 |

### Features

| Feature | Value |
|---|---|
| Digital Diagnostics Monitoring (DDM) | Yes |

## FAQ

### How much does the Lightwin SFP BiDi 1.25 Gbit 1550/1310 40km cost, and is it available for purchase?

The price is 47.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 16 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 Lightwin 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 Lightwin 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

### How can I tell if this product suits my needs?

When making a choice, we recommend paying attention to the key features: maximum data transfer rate, maximum transfer distance, fiber optic connector, compatibility with your devices or usage conditions, material quality, functionality, and warranty terms. These characteristics will help you determine how well the model meets your needs.

### Where can I download the instructions for Lightwin SFP BiDi 1.25 Gbit 1550/1310 40km?

You can download the instructions in PDF format from the “Instructions” section on the product description page. The file contains complete information about installation, setup, and usage.

## Image

https://aio.lv/img/cache/product/12368276/68487965_large.webp