Why Choose SFP28 25G SR Fiber Optic Module?

1.What is SFP28 25G SR?

YXF-S28-M85L-01D SFP28 transceivers are designed for use in 25Gb/s data rate over multimode fiber. They are compliant to IEEE802.3by, SFF-8472 Rev 12.2b and SFF-8402g, and compatible with SFF-8432a and applicable portions of SFF-8431 Rev. 4.1c. The optical transceiver is compliant per the RoHS Directive 2011/65/EUd .

Product Features:

Up to 25.78 Gb/s bi-directionaldata links

Hot-pluggable SFP+ footprint

Built-in digital diagnostic functions

850nm Oxide VCSEL laser transmitter

Duplex LC connector

RoHS compliant

100m over M5F MMF (50/125 um OM4)

70m over M5E MMF (50/125um OM3)

20m on MMF (50/125μm OM2)

Metal enclosure, for lower EMI

1.2W maximum power consumption

Single 3.3V power supply

Operating temperature range:0°C to 70°C

Applications:

25Gbps Ethernet

Data center and Fiber channel

2. What is the difference between SFP28 25G SR and LR?

2.1 SFP28 25G SR Definition

The SFP-25G-SR is a small form-factor pluggable optical transceiver that provides a fiber-optic transmission solution for 25 Gigabit Ethernet and InfiniBand Enhanced Data Rate applications.

It is designed for use with multimode fiber (MMF) and uses 850nm VCSELs for short-haul optical transmission. This transceiver provides enhanced performance for environments requiring high bandwidth and low latency, making it ideal for data centers, telecommunications networks, and high-performance computing environments.

2.2 SFP28 25G LR Definition

The SFP-25G-LR is an optical module designed for long-haul data transmission. It supports a data rate of 25 Gbps and transmits signals over single-mode fiber (SMF) at a wavelength of 1310nm, with a maximum transmission distance of up to 10 kilometers. SFP-25G-LR optical modules typically utilize distributed feedback lasers (DFBs) and PIN photodetectors, offering low power consumption and high transmission performance. They are widely used in data centers, enterprise networks, and communications/interconnect applications requiring long-distance transmission.

2.3 Transmission Distance and Fiber Type

SFP28 25G SR

Transmission Distance: Supports up to 70 meters using OM3 multimode fiber and up to 100 meters using OM4 multimode fiber.

Fiber Type: Utilizes multimode fiber (MMF) with a core diameter of 50/125µm, suitable for short-distance, high-bandwidth transmission.

Key Advantage: Multimode fiber is cost-effective and ideal for intra-rack connections.

SFP28 25G LR

Transmission Distance: Utilizes OS2 single-mode fiber, supporting up to 10 kilometers.

Fiber Type: Utilizes single-mode fiber (SMF) with a small core diameter (9/125µm), offering low attenuation and dispersion, making it ideal for long-distance transmission. Core Advantage: Single-mode fiber provides higher signal stability over long distances.

2.4 Laser and Photodetector Technology

SFP28 25G SR: Utilizes a vertical-cavity surface-emitting laser (VCSEL) operating at an 850nm wavelength, paired with a PIN photodetector. VCSEL technology offers low cost and power consumption (<1W), making it suitable for short-distance transmission.

SFP28 25G LR: Utilizes a distributed feedback (DFB) laser operating at a 1310nm wavelength, paired with a PIN detector and a built-in clock-data recovery (CDR) circuit. While its power consumption is slightly higher (<1.5W), it ensures stable long-distance signal transmission.

2.5 Cost Analysis

SFP28 25G SR: Multimode fiber offers low cost, and module manufacturing costs are also low, making it suitable for projects with limited budgets. SFP28 25G LR: Single-mode fiber and DFB laser technology increase costs, but long-distance transmission does not require additional repeater equipment, thereby reducing the total cost of ownership (TCO).

3. How to choose an SFP28 25G fiber optic transceiver？

When selecting a 25G optical transceiver, please consider the following factors:

Compatibility and vendor support

Ensure compatibility with the products of your switch or server vendors, such as Cisco, Juniper, and Arista.

Check the "Plug and Play" compatibility list or firmware verification.

Distance requirements

Based on your link length requirements, choose SR, LR, ER, or ZR.

Fiber optic infrastructure

Confirm the existing fiber types (OM3/OM4 multimode fiber and OS2 single-mode fiber).

Electricity and cooling budget

Count the total number of port power supply optics for each rack; low-power modules imply reduced cooling requirements and lower operational costs.

Monitoring and diagnosis

DOM functionality supports active maintenance, which is crucial for B2B service level agreements (SLAs).

Cost and performance

Weigh the initial module cost against its expected service life and replacement cycle.

In terms of budget flexibility, consider the comparison between aftermarket or third-party options and original equipment manufacturers (OEMs).