SFP 850nm vs 1310nm：What's the difference?

The difference between SFP modules operating at 850 nm and 1310 nm primarily lies in their wavelength, which affects their range, fiber type compatibility, and typical applications. Here’s a detailed comparison:

1. Wavelength:

   • 850 nm SFP: Operates at a wavelength of 850 nanometers. This wavelength is in the visible light spectrum, often producing a visible red light at the fiber end.

   • 1310 nm SFP: Operates at a wavelength of 1310 nanometers. This is in the infrared spectrum and not visible to the naked eye.

2. Fiber Type Compatibility:

   • 850 nm SFP: Typically used with multimode fiber (MMF). Multimode fiber has a larger core diameter, which allows multiple modes (or rays) of light to propagate.

   • 1310 nm SFP: Generally used with single-mode fiber (SMF). Single-mode fiber has a smaller core diameter, allowing only one mode of light to propagate, which reduces modal dispersion and allows for longer transmission distances.

3. Transmission Distance:

   • 850 nm SFP: Suited for shorter distances, usually up to 550 meters. Ideal for intra-building or intra-campus networking, like within data centers or enterprise LANs.

   • 1310 nm SFP: Can cover longer distances, typically up to 10 kilometers or more. This makes it suitable for longer-range applications such as metropolitan area networks (MANs) or longer intra-campus deployments.

4. Applications:

   • 850 nm SFP: Commonly used in local area networks (LANs), data centers, and high-speed computer link applications where the transmission distances are relatively short.

   • 1310 nm SFP: Often employed in wide area networks (WANs) and metropolitan area networks (MANs) where longer transmission distances are needed.

5. Cost:

   • 850 nm SFP: Tends to be less expensive due to the lower cost of multimode fiber and the technology used.

   • 1310 nm SFP: Can be more expensive, considering the higher costs associated with single-mode fiber technology and the components required for longer-distance transmission.

6. Bandwidth:

   • 850 nm SFP: Typically offers higher bandwidth over short distances, suitable for applications requiring high data throughput over short ranges.

   • 1310 nm SFP: While bandwidth might be lower compared to 850 nm over short distances, it maintains better performance over longer distances.

In summary, when choosing between 850 nm and 1310 nm SFP modules, consider the distance of your network links, the type of fiber cabling available, and the specific bandwidth requirements of your application.

 

What do SFP 850nm and SFP 1310 nm represent respectively?

Some customers want to know about the difference between multimode and single mode SFP , so we summarize some information about multimode and single-mode.The following is some concepts and the differences between multimode and single-mode SFP.

According to the wavelength,there are 850nm / 1310nm / 1550nm / 1490nm / 1530nm / 1610nm.850nm wavelength is fit for multimode SFP, transmission distance is below 2KM; 1310/1550nm wavelength is fit for single-mode SFP, transmission distance is over 2KM. Generally, the price of these three wavelengths is lower than the other three.
The raw modules are easily confused if there is no identity, the manufacturers will be distinguished in the color of the ring generally. For example: The black ring is multimode and the wavelength is 850nm; The blue, yellow and purple ring is single-mode, the wavelengths are 1310nm, 1550nm, 1490nm.

 

What is sfp 850nm?

An SFP (Small Form-factor Pluggable) module operating at 850nm wavelength is a type of optical transceiver used primarily for short-range data communication and telecommunications. This module is designed to work with multimode optical fiber and is commonly used in local area networks (LANs), data centers, and within buildings or campuses where high-speed data transfer is required over relatively short distances. Here are some key features and typical uses of an 850nm SFP module:

1. Wavelength: The 850nm refers to the operating wavelength of the module, which is in the visible light spectrum, often producing a visible red light at the fiber end.

2. Fiber Type Compatibility: 850nm SFP modules are typically used with multimode fiber (MMF), which has a larger core diameter and can carry multiple light modes. This characteristic makes MMF suitable for shorter transmission distances.

3. Transmission Distance: These modules are ideal for short-range applications, usually supporting distances up to 550 meters, though specific range capabilities can vary based on the module and fiber quality.

4. Data Rate: 850nm SFP modules support various data rates, including 1 Gbps, 10 Gbps (SFP+), and more, depending on the specific module type.

5. Applications: They are widely used in Gigabit Ethernet and Fibre Channel applications, Ethernet switches, routers, firewalls, network interface cards (NICs), and storage networking equipment within data centers and enterprise networks.

6. Connector Type: These modules typically use LC (Lucent Connector) duplex connectors.

7. Cost-Effectiveness: Due to their shorter range and compatibility with multimode fibers, 850nm SFP modules are generally more cost-effective compared to their long-range counterparts.

8. High Bandwidth Over Short Distances: They are well-suited for applications that require high data throughput over short distances.

The 850nm SFP modules are an essential component in modern networking, particularly in environments where high-speed, high-bandwidth data transfer is required over short distances, like within a data center or a corporate campus network.

 

What is the advantage of sfp 850nm?

SFP (Small Form-factor Pluggable) modules operating at an 850nm wavelength offer several advantages, particularly in certain network environments and applications. Here are the key advantages:

1. Ideal for Short-Distance Transmission: 850nm SFP modules are optimized for short-range data communication, making them perfect for intra-building connections, such as within data centers, offices, or campuses. They are typically used for distances up to 550 meters, depending on the fiber type and data rate.

2. High Data Rates: Despite their shorter range, 850nm SFP modules can support high data rates, making them suitable for applications that require fast data transfer over short distances. They are commonly used for 1Gbps, 10Gbps (SFP+), and even higher rates.

3. Cost-Effective: These modules are generally less expensive than those designed for longer wavelengths. The lower cost makes them a budget-friendly option for building high-speed local area networks (LANs) and storage area networks (SANs).

4. Multimode Fiber Compatibility: 850nm SFP modules are designed to work with multimode fiber (MMF), which is more cost-effective than single-mode fiber (SMF). MMF's larger core size is compatible with the light characteristics of 850nm modules, facilitating efficient data transmission over short distances.

5. Widespread Use in Data Centers: Their ability to support high data rates and their cost-effectiveness make 850nm SFP modules a popular choice in data center environments, where high-speed connections over short distances are common.

6. Easy Integration: 850nm SFP modules are widely compatible with existing network equipment and are easy to integrate into existing infrastructures, supporting a wide range of applications and protocols.

7. VCSEL (Vertical-Cavity Surface-Emitting Laser) Technology: Most 850nm SFP modules use VCSEL lasers, which are known for their low cost, low power consumption, and excellent performance in short-distance applications.

In summary, 850nm SFP modules are an excellent choice for short-range, high-speed, and cost-effective optical communication, particularly in data center and enterprise networking environments.

 

What is sfp 1310nm?

An SFP (Small Form-factor Pluggable) module operating at 1310nm wavelength is a type of optical transceiver used for data communication and telecommunication applications, typically over medium distances. Here are some key characteristics and typical applications of a 1310nm SFP module:

1. Wavelength: The 1310nm wavelength falls in the infrared spectrum and is commonly used in fiber optic communications. This wavelength is well-suited for longer distances compared to the 850nm SFP modules, which are designed for shorter ranges.

2. Fiber Type Compatibility: 1310nm SFP modules are typically used with both single-mode fiber (SMF) and multimode fiber (MMF), though they are more efficient and can cover longer distances when used with SMF.

3. Transmission Distance: These modules are suitable for medium-range applications, usually supporting distances from 2 km to up to 40 km, depending on the module's design and the quality of the fiber.

4. Data Rate: 1310nm SFP modules can support various data rates, including 1 Gbps, 10 Gbps (SFP+), and more, depending on the specific module type.

5. Applications: They are widely used in Gigabit Ethernet, Fibre Channel, and other telecommunications and data communications applications, particularly where longer cable runs are needed compared to those feasible with 850nm SFP modules.

6. Connector Type: Like the 850nm modules, 1310nm SFPs typically use LC duplex connectors.

7. Cost and Performance: While 1310nm modules can be more expensive than their 850nm counterparts, they offer better performance over longer distances, making them a more cost-effective choice for medium-range communications.

8. Versatility: Their compatibility with both single-mode and multimode fibers makes them a versatile choice for various network setups.

1310nm SFP modules are crucial for networking applications that require transmission over medium distances, such as in metropolitan area networks (MANs) or within large campuses. They provide a balance between the short-range capacity of 850nm modules and the long-range capabilities of modules designed for even longer wavelengths, like 1550nm.

 

What is the advantage of sfp 1310nm?

SFP modules operating at a 1310nm wavelength offer several advantages, particularly suitable for certain network applications. Here are the key benefits:

1. Longer Distance Transmission: 1310nm SFP modules are designed for longer transmission distances than their 850nm counterparts. They are typically used for distances up to 10 kilometers (km) or more, making them ideal for metro access networks, branch office connections, and other intermediate-range applications.

2. Single-Mode Fiber Compatibility: 1310nm SFP modules are typically used with single-mode fiber (SMF), which has a much smaller core size compared to multimode fiber. SMF allows for less signal attenuation and higher transmission distances, which is a key advantage of 1310nm modules.

3. Lower Dispersion and Attenuation: The 1310nm wavelength experiences less dispersion and attenuation in the fiber compared to shorter wavelengths, resulting in clearer signal quality over longer distances. This makes them more suitable for applications where signal integrity is crucial over moderate distances.

4. Versatility: 1310nm SFP modules can be used in a variety of applications, from enterprise networking to metropolitan area networks (MANs) and long-haul transmissions, offering a good balance between performance and cost.

5. Widely Used in Telecom Networks: This wavelength is commonly used in telecommunications networks for both point-to-point and passive optical network (PON) applications, offering a reliable solution for various telecom scenarios.

6. Compatibility with Existing Infrastructure: Many existing network infrastructures, particularly in telecommunication networks, are designed for 1310nm transmission, making these modules an easy fit for upgrades or expansions without the need for major overhauls.

7. Cost-Effective for Intermediate Distances: While not as inexpensive as 850nm modules for short distances, 1310nm SFP modules are more cost-effective than longer wavelength options (like 1550nm) for medium-range transmissions.

In summary, 1310nm SFP modules are a versatile and efficient choice for medium to long-range optical communication, providing a good balance of distance, performance, and cost for a wide range of networking and telecommunication applications.

 

Precautions for purchasing sfp 850nm and sfp 1310nm:

When purchasing SFP modules operating at 850nm and 1310nm wavelengths, there are several important factors to consider to ensure compatibility and optimal performance for your specific networking needs. Here are some key precautions:

1. Understand Your Distance Requirements:

   • 850nm SFP modules are typically used for short-range applications, usually up to 550 meters, and are compatible with multimode fiber.

   • 1310nm SFP modules can cover longer distances, up to 10 kilometers or more, and are generally used with single-mode fiber.

2. Check Compatibility with Network Equipment:

   • Ensure the SFP modules are compatible with your switches, routers, or other network equipment. Compatibility issues can lead to non-detection or performance problems.

   • Some manufacturers' devices may require branded or specifically coded SFP modules.

3. Fiber Type Compatibility:

   • 850nm modules are designed for multimode fibers, which have a larger core and are used for shorter distances.

   • 1310nm modules are typically used with single-mode fibers, suitable for longer distances with lower signal attenuation.

4. Assess Network Speed Requirements:

   • Both 850nm and 1310nm SFP modules come in various speed ratings like 1Gbps, 10Gbps, etc. Ensure the chosen SFP's speed matches your network's requirements.

5. Quality and Vendor Reputation:

   • Purchase from reputable vendors to ensure you get quality, reliable modules.

   • Consider the warranty and support options available for the SFP modules.

6. Budget and Cost Considerations:

   • 850nm SFPs are usually less expensive and are a cost-effective solution for short distances.

   • 1310nm SFPs might be more expensive but are necessary for longer-distance requirements.

7. Regulatory Compliance:

   • Ensure the SFP modules comply with relevant industry standards and regulatory requirements, such as IEEE standards, RoHS compliance, etc.

8. Check for Digital Diagnostic Monitoring (DDM):

   • DDM or Digital Optical Monitoring (DOM) capabilities allow you to monitor parameters like temperature, supply voltages, laser bias current, transmit optical power, receive optical power, etc.

9. Plan for Future Scalability:

   • Consider future network expansions or upgrades. It might be beneficial to invest in modules that can cater to future bandwidth or distance requirements.

10. Return Policy and After-Sales Support:

    • Check the return policy in case the modules are not compatible or do not meet performance expectations.

    • Ensure the vendor provides good after-sales support for any technical issues.

By carefully considering these factors, you can make an informed decision that meets both your current and future networking needs.
 

Is It Really Possible to Use 1550nm or 1310nm SFP Over MMF or 850nm SFP Over SMF?

Almost everyone used multimode fiber operated at an optical wavelength of around 800 to 880nm and used single-mode fiber which was almost always operated at 1310nm over distances of up to 100km and at 1550nm for longer distances. But in reality, it is quite possible to use 1550nm or 1310nm SFP over MMF, and some of the transceivers can satisfy this application. Moreover, it is also possible to use 850nm SFP over SMF in theory. As shown in the sketch below, modern single-mode fiber has very low attenuation at 850nm. In general, a multimode fiber will have around 2.5dB/km and a single-mode fiber will have about 1.8dB/km when operating at 850nm wavelength.

Why Don’t We Normally Do That?

Actually, multimode fiber operating at 1310nm is very commonly done in the practical application. The following table showed some types of optical transceivers that can transmit 1310nm over MMF.

Note: Every transceiver is individually tested on corresponding equipment such as Cisco, Arista, Juniper, Dell, Brocade and other brands, passed the monitoring of Fiberstore’s intelligent quality control system.

However, for single-mode fiber, though it has lower fiber attenuation than multimode fiber, we don’t normally operate single-mode fibers at 850nm. Why? There may be two reasons:

1. Typical light sources such as LEDs or VCSELs generally can’t couple a lot of power into the fiber so the use of 850nm would be restricted to quite low-speed links because such links generally employ sensitive optical receivers.

2. When operating much below 1250nm standard, single-mode fibers start operating like multimode fibers so there are several modes capable of propagating through the fiber. Since most single-mode fibers have a step index refractive index profile, it means that the bandwidth is very poor, typically 5-10MHz.km that is not much good for high-speed data.

1550nm, 1310nm are for single mode fibers, whereas 1310nm, 850nm are for mulimode fibers. The choice of wavelengths to be used can be derived from two of the most important factors, loss, and dispersion. Both of these should be very low for fiber to propagate large amount of information.

For SMFs

1550 nm provides lowest loss region, whereas 1310 nm provides lowest dispersion.

Accordingly light sources at these three wavelengths have been commercialized.