What areas does CWDM SFP apply to?

SFP stands for “small form-factor pluggable.” SFP transceivers are compact and hot-pluggable devices that act as an interface between networking equipment (switch, router, network card) and interconnecting cabling (copper or fiber).

The CWDM optical module is an optical module using CWDM technology to implement the connection between the existing network device and the CWDM multiplexer/demultiplexer.

When used with a CWDM multiplexer/demultiplexer, CWDM optical modules can increase network capacity by transmitting multiple data channels with separate optical wavelengths (1270 nm to 1610 nm) on the same single fiber.

The composite optical signal is decomposed at the receiving end using a wave decomposition multiplexer, thereby conserving fiber resources. Therefore, CWDM optical modules are called a low-cost and efficient network solution.

Secondly, the classification of CWDM optical modules

CWDM optical modules can be classified into CWDM SFF optical modules, CWDM SFP optical modules, CWDM GBIC optical modules, CWDM SFP+ optical modules, CWDM XFP optical modules, CWDM X2 optical modules, CWDMXENPAK optical modules, and CWDM LX-4 optical modules.

Third, CWDM optical module application field

CWDM optical modules are widely used in CATV (cable TV), FTTH (Fiber to the Home), 1G and 2G Fibre Channel, 100M and Gigabit Ethernet, Synchronous Optical Network SONET OC-3 (155Mbps), OC-12 (622Mbps) And OC-48 (2.488Gbps), security and protection systems.

Fourth, the advantages of CWDM optical modules

1. Data transmission is transparent;

2, large capacity, so that the huge bandwidth resources of fiber can be fully utilized;

3. CWDM technology greatly saves fiber resources and effectively reduces construction costs;

4. It has networking flexibility, stability and reliability;

5. Compatible with all-optical network switching to realize long-distance non-electrical relay transmission;

6. The simplification of the laser module reduces the size of the equipment and greatly saves the space of the equipment room;

7. The optical layer recovery has independence and can effectively protect data transmission;

8, low insertion loss, low polarization dependent loss

Through the above analysis, have you learned more about CWDM SFP optical modules ? At present, Fiberland Co., Ltd. is selling the above different specifications of CWDM SFP optical modules ,such as CWDM SFF optical modules, CWDM SFP optical modules, CWDM GBIC optical modules, CWDM SFP+ optical modules, CWDM XFP optical modules, CWDM X2 optical modules, CWDMXENPAK optical modules, and CWDM LX-4 optical modules.

Do you know The difference between CWDM transceiver and DWDM transceiver?

DWDM technology multiplexes the tight spectral spacing of a single optical fiber carrier in a given fiber to take advantage of the transmission performance that can be achieved. DWDM wavelength spacing is very tight, because the closer the spacing is, the more channels per fiber will be reused, and thus the higher the bandwidth. The international telecommunication union (ITU) g. 694.1 standard regulates the nominal wavelength interval of DWDM system. Each channel was spaced three ways: 0.4nm(50Ghz), 0.8nm(100Ghz), and 1.6nm(200Ghz).

The most important advantage of CWDM is the low cost of equipment. Because of the wide wavelength interval of CWDM system, the requirement for the technical index of laser is low, so the structure of laser is greatly simplified and the yield is improved. In addition, the power consumption and physical size of CWDM system are much smaller than DWDM system. In addition, CWDM light modulation adopts non-cooling laser and electronic tuning. DWDM USES a cooling laser and temperature tuning. Temperature tuning is difficult and expensive to implement because of the unevenness of temperature distribution over a wide wavelength range. CWDM avoids this difficulty, thus significantly reducing the cost. Currently, the cost of CWDM system is generally only 30% of DWDM. As the name implies, sparse wavelength division multiplexing (RWDM) is a close relative of dense wavelength division multiplexing (DWDM). There are two main differences between them. Firstly, CWDM carrier channels are widely spaced. CWDM modulating laser USES non-cooling laser, while DWDM USES cooling laser. Temperature tuning is used for cooling laser and electronic tuning is used for non-cooling laser. Temperature tuning is difficult and expensive to implement because of the unevenness of temperature distribution over a wide wavelength range.

CWDM avoids this difficulty, because it significantly reduces the cost, the cost of the whole CWDM system is only 50% of DWDM.CWDM provides a high access bandwidth at a very low cost and is suitable for point-to-point, Ethernet, SONET ring and other popular network structures. It is especially suitable for short distance, high bandwidth and point-intensive communication applications, such as network communication within or between buildings. CWDM and PON (passive optical network) are particularly worth mentioning.

PON is an inexpensive, point-to-multipoint optical fiber communication method. By combining with CWDM, every single wavelength channel can be used as a PON virtual optical link to realize broadband data transmission between the center node and multiple distribution nodes. What are the differences between thick wavelength division multiplexer (CWDM) and dense wavelength division multiplexer (DWDM)? take the fast optical fiber as an example to compare the main band spacing and band 2 differences.

Wavelength division multiplexing (WDM) refers to the use of laser signal multiplexing to send multiple beams of different wavelengths simultaneously on a single optical fiber. Each optical signal has its own wavelength, and they are usually concentrated in the range of 1500nm to 1600nm, which is called the WDM ribbon. Optical signals are modulated by data (text, speech, video, etc.) and transmitted in its own color band. WDM supports existing network bandwidth expansion without the need to add additional fiber optic cables, and can save fiber installation costs, significantly reducing the operational capacity costs of metropolitan and wide area networks. WDM can also implement solutions that cannot be implemented without increasing the number of optical fibers.

First, on the one hand, FDM is generally used to describe old multiplexing systems that process electrical signals, while WDM refers to newer multiplexing systems that process optical signals.

Secondly, on the other hand, in the FDM system, each frequency multiplexing represents the multiplexing of models from a single transmitting source, while one of the main applications of WDM is the multiplexing of optical fiber synchronous network (SONET) signals. Each SONET signal can transmit multiple signals from multiple sources through time division multiplexing (TDM) technology. Therefore, in the application of timing, WDM technology will generally combine TDM and FDM technologies to achieve higher bandwidth utilization.

The difference between optical module and optical transceiver

Optical fiber has become people’s first priority in communication installation due to its advantages of fast transmission speed, long distance, safety and stability, and strong anti-interference ability. At present, the long-distance data transmission used in many smart projects basically uses optical fiber transmission. The connection between these requires an optical module and an optical fiber transceiver. Many users have some doubts about the use of optical modules and optical transceivers. How to connect the two, and what are the precautions? Below, fiber-mart.com will share the difference between optical modules and optical transceivers.

1. Optical module

The optical module is an optoelectronic device that performs photoelectric and electro-optical conversion. The transmitting end of the optical module converts electrical signals into optical signals, and the receiving end converts optical signals into electrical signals. Optical modules are classified according to the packaging form. Common ones include SFP, SFP+, SFF, Gigabit Ethernet Interface Converter (GBIC), etc.

2. Optical fiber transceiver

Optical fiber transceiver is an Ethernet transmission media conversion unit that exchanges short-distance twisted-pair electrical signals and long-distance optical signals. It is also called a photoelectric converter in many places.

Converter). With the optical fiber transceiver, it also provides a cheap solution for users who need to upgrade the system from copper wire to optical fiber, and for users who lack funds, manpower or time. The function of the fiber optic transceiver is to convert the electrical signal we want to send into an optical signal and send it out. At the same time, it can convert the received optical signal into an electrical signal and input it to our receiving end.

3. The difference between optical modules and optical transceivers

A. The optical module is a functional module, or accessory, is a passive device that cannot be used alone. It can only be used in switches and devices with optical module slots; while the optical fiber transceiver is a functional device and is a separate active device. The equipment can be used alone with the addition of dots;

B. The optical module itself can simplify the network and reduce the points of failure, while the use of optical fiber transceivers will increase a lot of equipment, greatly increase the failure rate and occupy too much institutional storage space, which is not beautiful;

C. The optical module supports hot-swappable, and the configuration is relatively flexible; the optical fiber transceiver is relatively fixed, and it will be more troublesome to replace and upgrade than the optical module;

D. Optical modules are more expensive than fiber optic transceivers, but they are relatively stable and not easy to damage; while fiber optic transceivers are economical and suitable, but consider power adapters, light status, network cable status and other factors, and transmission loss occupies 30%. %about;

E. Optical modules are mainly used for optical interfaces of optical network communication equipment such as convergence switches, core routers, DSLAM, OLT and other equipment, such as: computer video, data communication, wireless voice communication and other optical fiber network backbone networks; optical fiber transceiver applications In the actual network environment where the Ethernet cable cannot be covered and the optical fiber must be used to extend the transmission distance, it is usually positioned in the access layer application of the broadband metropolitan area network;

4. Precautions for optical modules and optical transceivers

The wavelength and the transmission distance must be the same. For example, the wavelength is 1310nm or 850nm at the same time, and the transmission distance is 10km; the fiber jumper or pigtail must be the same interface to connect. Generally, the optical fiber transceiver uses the SC port and the optical module uses the LC port. This point will prompt the choice of interface type when purchasing. At the same time, the speed of the optical fiber transceiver and the optical module must be the same. For example, a gigabit transceiver corresponds to a 1.25G optical module, 100M to 100M, and Gigabit to Gigabit; the light type of the optical module must be the same, single fiber to single fiber, Dual fiber to dual fiber.

Problems encountered in the installation and use of fiber optic transceivers and their solutions

This article will share with you the problems and solutions frequently encountered during the installation and use of fiber optic transceivers. When encountering these problems, how should we deal with them? Now Fiber-mart.com Communication will share with you the installation and troubleshooting methods of the optical fiber transceiver through this article:

Problems encountered in the installation and use of optical fiber transceivers

Step 1: First check whether the indicator light of the fiber optic transceiver or optical module and the twisted pair port indicator light are on?

1. If the optical port (FX) indicator of the A transceiver is on and the optical port (FX) indicator of the B transceiver is off, the fault is at the A transceiver: one possibility is: A transceiver (TX) optical transmission The port is broken, because the optical port (RX) of the B transceiver cannot receive optical signals; another possibility is: there is a problem with the optical fiber link of the optical transmitting port of the A transceiver (TX), such as a broken fiber jumper .

2. If the FX indicator of the transceiver is off, please make sure whether the optical fiber link is cross-linked? One end of the fiber jumper is connected in parallel; the other end is connected in cross mode.

3. Twisted pair (TP) indicator light is not on. Please make sure whether the twisted pair connection is wrong or wrong? Please use a continuity tester to check (but the twisted pair indicator of some transceivers must wait for the optical fiber link Lights up after the circuit is connected).

4. Some transceivers have two RJ45 ports: (ToHUB) indicates that the cable connecting the switch is a straight-through line; (ToNode) indicates that the cable connecting the switch is a crossover cable.

5. There is an MPR switch on the side of some transmitters: it means that the connection line to the switch is a straight-through line; DTE switch: the connection line to the switch is a crossover line.

Step 2: Analyze and determine whether there are problems with fiber jumpers and cables?

1. On-off detection of optical fiber connection: use a laser flashlight, sunlight, etc. to illuminate one end of the optical fiber jumper; see if there is visible light at the other end? If there is visible light, it indicates that the optical fiber jumper is not broken.

2. Optical cable on-off detection: use a laser flashlight, sunlight, or luminous body to illuminate one end of the optical cable connector or coupler; see if there is visible light at the other end? If there is visible light, it means that the optical cable is not broken.

Step 3: Is the half/full duplex mode wrong?

There is an FDX switch on the side of some transceivers: it means full-duplex; HDX switch: it means half-duplex.

Step 4: Use an optical power meter to detect

The luminous power of the optical fiber transceiver or optical module under normal conditions: multimode: between -10db and 18db; single mode 20 km: between -8db and 15db; single mode 60 km: between -5db and 12db ; If the luminous power of the optical fiber transceiver is between -30db–45db, then it can be judged that there is a problem with the transceiver.

Matters needing attention in fiber optic transceivers

For the sake of simplicity, it is better to use a question-and-answer format, which can be clear at a glance.

1. Does the optical transceiver itself support full duplex and half duplex?

Some chips on the market can only use the full-duplex environment at present, and cannot support half-duplex. If they are connected to other brands of switches (SWITCH) or hubs (HUB), and it uses half-duplex mode, it will definitely cause Serious conflicts and packet loss.

2. Have you tested the connection with other fiber optic transceivers?

At present, there are more and more optical fiber transceivers on the market. If the compatibility of transceivers of different brands has not been tested beforehand, it will also cause packet loss, long transmission time, and sudden speed and slowness.

3. Is there any safety device to prevent packet loss?

In order to reduce costs, some manufacturers use Register data transmission mode when manufacturing fiber optic transceivers. The biggest disadvantage of this method is instability and packet loss during transmission. The best is to use buffer circuit design, which can be safe. Avoid data loss.

4. Temperature adaptability?

The fiber optic transceiver itself will generate high heat when it is used. When the temperature is too high (not greater than 50°C), whether the fiber optic transceiver is working properly is a factor worthy of customers’ consideration!

5. Does it comply with the IEEE802.3u standard?

If the fiber optic transceiver meets the IEEE802.3 standard, that is, the delaytime is controlled at 46bit, if it exceeds 46bit, it means that the transmission distance of the fiber optic transceiver will be shortened!!!

6. After-sales service:

In order to enable the after-sales service to respond promptly and early, it is recommended that customers purchase optical fiber transceivers according to the manufacturer’s strong strength, technology, reputation and other companies. For example: ETULINK (etulink.com) is a high-tech company focusing on the development, application and promotion of new technologies and new products. With a good reputation, stable product quality and professional technical service capabilities, the company has become the preferred supplier of switching equipment, routing equipment and other network products at home and abroad.

Advantages of Jetting Fiber Optic Cable Over Traditional Pulling

What are the advantages of blowing or jetting fiber optic cable vs. traditional pulling?

Pulling and blowing are the two primary fiber installation methods. But each of these techniques can impact the longevity, performance, and return on investment (ROI) of a fiber optic network. If you take into account the fragility of glass or fused silica during installation, distance to be covered, efficiency, and costs, you may see that jetting (blowing) offers many advantages over traditional cable-pulling techniques.

An Overview of Fiber Optic Cable Installation Methods

• Pulling: It involves pulling the fiber optic cable through pre-installed underground or aerial ducts. You can pull the cable manually or using a reeling machine. You’ll also need a pulling tape to haul the cable while measuring the distance covered.

• Blowing: With this technique, high-speed air pressure pushes fiber optic cables through standard ductwork or microduct systems.

Here are the reasons why cable jetting is superior to traditional pulling methods:

Minimal Risk of Tension Damage

Each brand of optical fiber cable has a maximum tensile strength. But in pulling, there’s a risk of straining the cable beyond its limit, which can compromise the fiber’s performance and cut its service life. Unchecked resistance forces, such as friction, on the sidewalls of cables and ducts, can also cause damage during a “pulling” installation.

In contrast, jetting involves little or no pulling, which significantly minimizes strain on the fiber optic cable. You can not only configure the system’s hydraulic pack or air-compressing equipment to control airflow inside the duct but also monitor the conduit and fiber to minimize damage.

To minimize friction during cable jetting, consider applying lubricants meant for the method. Ducts with low-friction interior walls may also help.

Suitability for Long-Haul Fiber Optic Networks

Pulling isn’t the best option for placing outside plant (OSP) fiber optic cable. With the technique, there’s always a high possibility of pulling the cable into conduit bends. And as bend angles continue to accumulate, it becomes increasingly difficult to optimize pull length. The bad news is that ducts for cross-country fiber optic networks can have many bends.

As such, pulling is ideal for short-distance fiber optic cable deployment. Distance will vary from one manufacturer to another and cable jacket material plays a role too.

With high air speed blowing fiber optic installation, however, conduit bends and undulations aren’t as much of an issue as they are with traditional cable-pulling techniques. The blowing force doesn’t pull the cable into a duct bend. It instead pushes it smoothly around every turn or curve.

In other words, the duct route geometry doesn’t impact installation distance in this case. Consequently, air-assisted installation lets you place fiber optic cable thousands of feet between jetting sites. That’s why it’s suitable for OSP fiber deployments, for example, telecommunication, CATV, and internet networks.

Reduced Costs

Cable jetting equipment and ductwork may be initially expensive. But you can amortize these upfront costs depending on current needs, and your initial investment may pay off in future savings on upgrades. For example, you don’t have to invest in redundant higher fiber counts when you can cheaply upgrade capacity in tandem with changing requirements. 

Likewise, “pulling” is more labor-intensive than the blowing method. The technique involves more equipment movement, and it may require the positioning of placing tools at intermediate points and both ends of long OSP runs. Additional workers and extra equipment translate to higher installation costs. Cable jetting requires fewer cabling technicians, however.

Keep in mind that air-assisted optical fiber installation minimizes the number of splices needed. Cables installed this way don’t usually require “figure-eight” looping to prevent twisting every time duct changes direction. Since the approach has fewer intermediate-assist placement operations, it limits the number of handholes and other access points required along the cabling route.

Suitability for Microduct Installation

Jetting is very effective in pushing fiber optic cable through microducts. With the blowing method, you can place microduct cable in continuous lengths. The technique is most suitable for modern optical fiber cables that tend to contain bare fibers, and sometimes reduced cladding diameters, both of which contribute to decreased outer cable diameters.

The thinner a fiber optic cable is, the larger the number of fibers you can place in specific innerduct. As such, jetting is the best installation technique when you wish to make the most of the available duct capacity. It also allows you to work with small but flexible fibers that go through multiple microduct twists and turns over long distances with near-zero bend losses.

Additionally, when setting up microducts for fiber optic cable jetting, you may include redundant ductwork to accommodate new fiber in the future as required. This way, you avoid the unnecessary costs of placing dark fiber, which may become obsolete sooner than anticipated.

Appropriate for Removal of Old Fiber

Pulled fiber optic cable may be difficult to remove when no longer needed. The presence of old and unwanted cables in mission-critical physical pathways may limit your ability to optimize your optical network capacity or even upgrade to higher-performance fibers.

But after installing optical fiber by cable jetting, you may easily remove it by the same approach when necessary. You may be able to reuse the removed fiber optic cable since the removal process is gentle enough to minimize or avoid damage.

Quick Installation

Cable jetting is faster than the “pulling” method. The pushing device can move fiber optic cable at speeds of 350 feet per minute or higher. With the air-jetting technique, you can quickly push cables through pre-installed innerduct or underground ductwork. But in most cases, you can only pull fiber at a rate of 100-200 feet per minute, or even slower.  

Less Disruption Choose cable jetting to upgrade your optical fiber with minimal interruption to ongoing workflows or operations. The cable-pulling approach is more disruptive.  

A Guide to Optimizing Your Fiber Optic Cable Management

How safe, efficient, and organized is your fiber optic cabling? That largely depends on your cable management practices. Optimal organization of your networking cables delivers these benefits:

• Enhanced signal integrity by minimizing macrobend losses

• Protection of cables from macro-bending damage

• Improved accessibility for maintenance and upgrades

• Quick cable identification

• Neat and aesthetically-pleasing fiber infrastructure

But you need to use the right tools and methods to optimize your fiber optic cable management. Here’s how to do it right:

Use Vertical or Horizontal Cable Managers

Vertical and horizontal cable managers hold your cabling together for orderly and efficient management. You may need them both to secure and organize your fiber-optic cables.

For example, you may place horizontal managers in front of cabinets or racks and use them to neatly hold your cables together. These tools also work well with panel patches by providing a neat way to route fiber cabling from the back to the front of the rack where switch ports are installed.

Horizontal management helps to keep cables from tangling so you can quickly make changes or identify, access, and fix specific cabling issues.

Available options include:

• D-Ring

• Finger duct

• End ring

• Brush strip

• Lacing bar

Alternatively, you may mount vertical cable managers on both sides of the rack to safely bundle your cables. This management style provides a vertical path for a large number of premise cables from switches or other network equipment.

With vertical cable management, you’re also able to separate power cords from the optical fiber cables.

Types of vertical cable management products include:

• Finger Duct Vertical Bars

• D-Ring Vertical Bars

• Vertical Lacing Bars

Use Cable Lacing Bars

Cable lacing bars provide a cost-effective way to secure and support fiber optic cabling in rack or enclosure systems. Adjustable clips or ties are used to secure cables to these metal bars. Their benefits include:

• Easing strain on cables to optimize network integrity. They also prevent strain-related damage to the ports on rack-mount devices. • Neat and aesthetically-pleasing ways to route cables horizontally and vertically. • They help with bend radius control to prevent damage to cables and minimize signal loss.

There are different shapes and types of cable lacing bars, namely:

• Round lacer bars

• Rectangular lacer bars

• L-shaped lacer bars

• Square lacer bars

• Horizontal lacer panel

• 90-degree bend lacer bar

When choosing your lacer bars, consider factors like the size of the cable runs and the offset required.

Zip Ties vs. Velcro Hook and Loop Wraps

You can also neatly and safely hold a bunch of networking cables together by wrapping or tying them. In most structured fiber optic network projects, technicians use zip ties or Velcro wraps to do that. Both options are excellent, but a look at their distinct features can help to choose the best for your cable management requirements.

Zip ties features include:

• Easy to use: Simply strap it around your cables and fasten it.

• Sturdy: They steadily secure cables in place.

• Durable: Excellent for permanent fastening.

• Cheap: Cheaply available in large quantities.

However, the main issue with zip ties is that they’re not reusable. You have to cut and get rid of them to add in more cables. Also, there is the concern that the zip tie can be “over cinched” – holding the cables together too tightly which can cause attenuation or worse – broken fibers.

Velcro straps features include:

• Reusability: To add cables to a bundle, you quickly unwrap, add, and re-wrap. Velcro straps are therefore an excellent temporary optical cabling support solution.

• Cable safety: Cutting zip ties risks damaging the cables. But unwrapping Velcro wraps involves no cutting.

Nonetheless, Velcro straps are more expensive than zip ties, although their reusability makes them a worthy investment for cable management.

Mark and Label Your Fiber Optic Cables

When you mark and label [https://www.fiberinstrumentsales.com/searchanise/result?q=label+printer] your fiber optic cables at both ends, you can quickly tell what you’re dealing with at all times. Doing that saves you troubleshooting time, and makes it easier and quicker to reorganize or make changes to your cabling structure. Here are some tips for getting it right:

• Size: Pick labels with sufficient space to add identification information for the size of your simplex or duplex fiber optic cables.

• Visibility: High-visibility labels display information clearly for quick identification .

• Labeling standards: Use a consistent labeling standard, such as the TIA/EIA-606-A, to name and number your optical fiber cables.

Different types of cable markers and labels include:

• ID tags: You may wrap these around bundles of cables. Other types of ID tags come with hook-and-loop closures or ties for strapping around the cables.

• Wire markers: Use these to identify individual cables. They may be numbered or color-coded to simplify the labeling process. Some are available as labeling tapes.

Cable Management With Fiber Enclosures

Fiber enclosures are boxes that house the devices and equipment that connect or terminate optic fiber cables. They’re of different types, including:

• Rack-mount enclosures

• Wall-mount enclosures

• Indoor or outdoor enclosures

The 19-inch rack-mount fiber enclosure is the most commonly deployed in fiber optic cable management and termination, and it’s usually available in five different configurations, namely 1RU, 2RU, 4RU, and 8RU. Of course, other configurations are available – these are just the most common.

Consider the following requirements to select the right rack-mount enclosure configuration:

• Number of Connections Needed: These determine the number of rack units (RU) required. A rack-mount enclosure with a larger number of RUs accommodates more fiber adapter panels. The greater the number of adapters loaded on the adapter panels, the more fibers the enclosure can hold.

• Accessibility: The type with a removable top is cheaper but more difficult to access when adding or moving cables. The slide-out or swing-out types have support trays that come out, which simplifies internal access. They cost more, however.

• Flush Mount Patch Panels: One option is the flush mount patch panel enclosure for mounting fiber optic adapters. Other rack-mount configurations may have several removable front panels. Their plug-and-play construction makes light work of fiber optic network installation and makes them an excellent cable management solution.


When your cable management is optimized, it brings organization to your cabling infrastructure, enabling you to save time, effort, and costs. This way, you can conveniently and quickly access cables within your network to implement repairs, upgrades, or other changes. Equally important, keeping your optical fiber network neat and optimally-managed means protecting it to preserve signal integrity. Still not sure of the tools or methods to use for your specific cable management solution? Contact one of our fiber optic technicians right away to explore your options!