Category: Fiber Transceivers

Generally, if you want to buy high-quality MTP/MPO fiber optic patch cords, you need to consider many factors, such as fiber core brand, connector, insertion loss, etc. The following is a list of five characteristics that high-quality MTP/MPO wires should have.

1. Branded Fiber Optic Core

MTP/MPO fiber optic patch cords are usually deployed in relatively small spaces, such as telecommunications distribution boxes, data center cabinets, etc. In these cases, the fiber core needs to have a curved arc. Inferior fiber core bending usually results in loss of signal, resulting in interruption of transmission. But brand optical fiber is different. For example, Corning optical fiber can greatly improve bending performance, minimize signal loss, and achieve faster and more efficient optical fiber wiring and installation. Therefore, brand fiber cores are very important for MTP/MPO fiber jumpers.

2. MTP/MPO connector that meets industry standards

MTP/MPO fiber optic connectors can encapsulate 12, 24 or 72 fibers into one fiber to increase fiber density, so it is very popular in data centers with limited space. Industry-approved MTP/MPO connectors (such as US Conec or Senko connectors) can ensure the polarity of MTP/MPO cables and reduce insertion loss and return loss. The MTP/MPO connector conforming to industry standards is sturdy and durable, and can be recycled hundreds of times. The interface between the connector and the fiber jumper is round, so the fiber jumper can be carried out from any direction of the MTP/MPO connector port Wiring simplifies the wiring structure. Therefore, it is also very important to buy high-quality MTP/MPO fiber optic patch cords and industry-approved MTP/MPO connectors.

3. Insertion loss

Insert Loss (Insert Loss) refers to the loss of the effective optical power of the link caused by the insertion of a connector or plug. It is one of the key factors affecting the performance of the optical fiber network. The smaller the insertion loss, the better the network performance. In general, the insertion loss of MTP/MPO multi-mode fiber patch cords should not exceed 0.6 dB, and the insertion loss of single-mode MTP/MPO fiber patch cords should not exceed 0.75 dB. For single-mode and multi-mode MTP/MPO fiber jumpers with low insertion loss (high quality), the insertion loss is usually required to not exceed 0.35 dB. When choosing MTP/MPO fiber optic patch cords, you can choose the supplier that provides the insertion loss test report.

4. Flame retardant grade

The shell of MTP/MPO fiber jumper can be made of different materials, these materials have different fire resistance, can be divided into polyethylene (Polyethylene), polyvinyl chloride (PVC), low-smoke halogen-free (LSZH), etc., Most of them have good flame retardant properties. If there are higher requirements for the installation environment, such as suspended ceilings and raised floors, it is best to choose MTP/MPO fiber jumpers with a higher flame retardant rating, so that it is not easy to burn or smoke in the event of a fire.

When purchasing MTP/MPO fiber optic patch cords, you can check the flame retardant rating directly on the protective jacket, and then choose the appropriate MTP/MPO fiber patch cord according to the actual applicable environment of the protective jacket and flame retardant rating of the fiber optic patch cord. For more information about the protective sleeve and flame retardant grade of optical fiber jumper, please refer to the following: Optical fiber jumper protective sleeve and flame retardant grade

5. Fiber patch cord test

MTP/MPO fiber optic patch cord connector end face inspection: In order to ensure that the fiber optic connector has qualified or higher performance, the International Electrotechnical Commission (IEC) has developed the IEC 61300-3-35 standard to define whether the connector end face is qualified. The end face of the MTP/MPO jumper connector is divided into four areas: core area, cladding area, glue edge area and ferrule surface. It has requirements for scratches and blemishes in each area of ​​the connection. Scratches represent permanent linear surface features. Defects include all detectable non-linear features on the fiber, including particles, other debris, pits, debris, edge chipping, etc. The cleaner the end face, the better the cable quality. Therefore, if you want to buy the best MTP/MPO cable, you should choose fiber optic patch cords that pass end-face inspection, such as fast (FS) MTP/MPO fiber optic patch cords.

If the connector size of the MTP/MPO cable cannot meet the requirements, problems such as system connection failure will occur. Therefore, it is very important to choose MTP/MPO fiber patch cords that have passed the 3D interferometer test.

In summary, before buying MTP/MPO fiber optic patch cords, we need to consider many factors. Nowadays, many suppliers can provide MTP/MPO fiber optic patch cords, but not all patch cords are quality guaranteed. In order to choose high-quality MTP/MPO fiber optic patch cords, please choose a MTP/MPO fiber optic patch cord that can meet all the above standards.

The appearance of the QSFP28 optical transceiver is the same as that of the 40G QSFP + optical transceiver. The difference is that QSFP28 optical transceiver can transmit optical signals up to 100G. Therefore, QSFP28 optical transceiver has become the mainstream 100G optical transceiver and the preferred solution for network upgrade of 100G. This article describes the differences between the QSFP28 PSM4 optical transceiver, the QSFP28 SR4 optical transceiver, and the QSFP28 LR4 optical transceiver.

The Definition of Different Types of QSFP28 Optical Transceiver:

QSFP28 PSM4 optical transceiver is a high-speed, low-power product with a hot-swappable QSFP form factor with built-in digital diagnostics and eight optical fibers, each with a data rate of 25Gbps.

QSFP28 SR4 optical transceiver is a parallel 100G optical transceiver with the advantages of high port density and low cost. If you need a short distance transmission of optical transceivers for 100G network upgrade, you can choose QSFP28 SR4 optical transceiver.

QSFP28 LR4 optical transceiver, an optical transceiver with transmission distances up to 2km, provide an ideal solution for the ever-increasing transmission distance requirements of very large data centers and will lead the use of single-mode optical fibers in the data center.

QSFP28 Optical transceiver Differences:

1. Transmission Methods

As we all know, QSFP28 optical transceiver usually has four transmission channels, and each channel data rate is 25Gbp. This transmission is very similar with 40G QSFP + optical transceiver transmission. 100G QSFP28 SR4 and 100G QSFP28 PSM4 optical transceivers are 12-way MTP interface, while the realization of the 8-way fiber 100G transmission is bidirectional. But the 100G QSFP28 LR4 optical transceivers cannot do this, QSFP28 LR4 optical transceiver is transmitted at the same time in two uses of LC duplex fiber in one direction for 100G transmission.

2. Transmission Media and Transmission Distance

QSFP28 PSM4 optical transceiver, QSFP28 SR4 optical transceiver and QSFP28 LR4 optical transceiver transmission distance are also different. QSFP28 SR4 optical transceiver operates at 850nm and is used with OM3 or OM4 multimode fibers for transmission distances of up to 70m with OM3 fibers and up to 100m with OM4 fibers. QSFP28 LR4 optical transceiver is usually used with single-mode fiber, which operates at 1310 nm and has a maximum transmission distance of up to 2km. QSFP28 PSM4 optical transceiver, is generally used with a 12-way MTP interface and single-mode optical fiber with a transmission distance of up to 500m.

3. The Wiring Structure Is Different

Optical transceiver transmission in the optical fiber routing has a very important role. Because the QSFP28 SR4 optical transceiver and the QSFP28 LR4 optical transceiver are used for short-distance transmission and long-distance transmission respectively, their wiring structures are different. The former requires multi-fiber cabling based on a 12-way MMF MTP interface, while the latter requires only a traditional two-fiber SMF cabling. In this case, the conversion between multimode fiber and single-mode fiber is very complicated because they use a completely different wiring structure.

Although QSFP28 PSM4 optical transceiver operates in single-mode fiber, its wiring structure is the same as that of the QSFP28 SR4 optical transceiver. Using the QSFP28 PSM4 optical transceiver saves conversion costs between multimode and single-mode without changing existing cabling structures.

4. Different Working Principle

(1) How QSFP28 PSM4 optical transceiver works:

The working principle of the QSFP28 PSM4 optical transceiver is almost the same as that of the QSFP28 SR4 optical transceiver. The difference is that the QSFP28 PSM4 optical transceiver operates on single-mode fiber while the QSFP28 SR4 optical transceiver operates on OM4 multimode fiber.

(2) How QSFP28 SR4 optical transceiver works:

QSFP28 SR4 optical transceiver transmits signals at the transmitting end; the electrical signals are converted into optical signals by the laser array and then transmitted in parallel on the ribbon multimode fiber. Upon reaching the receiving termination, the photo detector array converts the parallel optical signals into parallel electrical signals.

(3)How QSFP28 LR4 optical transceiver works:

QSFP28 LR4 optical transceivers are typically used with LC single-mode fiber optic cables to convert 4×25Gbps electrical signals into 4 LAN WDM optical signals and then multiplexed into a single channel for 100G optical transmission. At the receiving end, the module demultiplexes the 100G optical inputs into 4 LAN WDM optical signals, and then converts them into 4 channels of electrical signal output.

Summary:

QSFP28 SR4 optical transceiver is suitable for use in 12-way MTP fiber cabling systems and also for short-distance transmission of OM3, OM4 multimode fiber. QSFP28 PSM4 optical transceiver is also suitable for transmission with 12 MTP interfaces, but it is suitable for use with single-mode fibers and can transmit distances up to 500m. QSFP28 LR4 optical transceiver is for data transmission up to 2km.

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.

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.

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.

If you have ever spliced optical fiber then you know what a fiber optic cleaver is. If you are new to fiber, then the mention of a cleaver may be a new concept. In simple terms, a cleaver is used to cut your fiber so you have two ends that will line up and can be welded together using a fusion splicer or they can be brought together in a mechanical splice. Fiber optic cleavers are essential tools when splicing and putting connectors on in the field. There are different brands of cleavers and they all have different looks but they all perform the same job. If you are used to a certain manufacturer and you like them, then you should stay with them. When you buy a splicer kit it usually will include a precision Fiber Optic cleaver.  When we talk about cleavers, there are several features and different types for you to consider. We will discuss these in the article below.

Different Types of Cleavers

The two main types of cleavers are field cleavers and precision cleavers. Field cleavers are also known as beaver cleavers. These cleavers are used primarily for Multimode fiber applications and they are sometimes used with quick term connectors. When using this kind of cleaver you will press the blade down on the fiber to score the glass and then bend the “tail” to break the glass fiber.

On the other hand, there are precision cleavers. These cleavers are used for fusion splicing and when terminating single mode fiber with quick term connectors. A precision cleaver makes a perfect flat cut, leaving a 90 degree cleave angle on the end of the fiber. It prepares the fiber so that it is ready to splice two pieces together. There are several different manufacturers and with that also some different features and slightly different looks. In the end, they all have the same goal of getting a fiber ready to splice or put a quick term connector on.

Steps to Follow When Cleaving

When you are using either style cleaver, field or precision, there are common steps that will need to be performed before you cleave. The first step is to remove the outer most jacket of the cable you are working on. To do this you will use a tool called strippers. Once you have removed the jacket(s) from the fiber, then you have to get the acrylate coating off of the fiber. This is a coating layer that is put on the glass which allows the fiber to be handled and put on a spool without breaking. As the acrylate coating peels off, you will see it almost curl like when scooping ice cream. This step is critical. Make sure all of this acrylate fiber coating is removed. If any of this coating is left on the fiber, when you go to cleave it, it will make it seem like the cleaver is not working properly. I have had a number of tech calls that start out with “My cleaver is not working properly; I need a new one.” The first question I ask is “Did you go back over your fiber with the 250um slot in your strippers?” Normally you hear silence at the end of the line, then they say thank you and they will call if something else is wrong. You usually do not hear back from that person. So make sure that you remove all of the acrylate coating. Once this is done then you use your alcohol or other fiber optic cleaning solution and wipes to clean off the fiber. If it is cleaned properly, you will hear it squeak while you run the wipe with alcohol over the bare fiber. Always clean the fiber before you cleave. Never clean the fiber after you cleave it because it is very likely that you will damage the end of the fiber.

Types of Precision Cleavers

Precision cleavers work in a variety of ways. There are three step cleavers that require technicians to go through three steps in order to cleave the fiber. These steps usually include closing the lid, pushing the cleaver blade to cut your fiber, and then opening the lid to remove the cleaved fiber. There are one step cleavers where all you do is push the lid down and the cleaver will do everything else, including sliding the cleaver blade and moving the piece of glass into your scrap bin. These kinds of cleavers have helped to speed up the process, and make it easier to prep your fiber for splicing.

When using a cleaver there are a couple of things that you need to pay attention to in order to maintain the cleaver. One of these maintenance tasks is the rotating of the cleaver blade. A cleaver blade has up to 16 different positions that are used and each position has a limit on how many cleaves it can perform well. Each position is good for roughly one thousand cleaves. So every thousand cleaves the blade should be rotated to a new position.

Auto Rotating Blades

Most recently there have been upgrades to cleaver technology that assist to extend the life of a blade, as well as making it easier on a tech to maintain. One of these features is an auto rotating blade. This assists in making sure that the blade is used evenly and it will help to extend the life of the blade. How it works is that every time you make a cleave on a piece of fiber the blade automatically rotates to the next position on the blade. This will help extend the life of a blade.

There are times when you will cleave on a set position and it will get worn quickly or produce bad cleaves and force you to rotate the blade before you get the thousand cleaves in the one position. By auto rotating it helps to eliminate one position getting worn down too quickly.

Another feature that has been added to some of the newer cleavers is the Wi-Fi/Bluetooth feature which allows the cleaver to “talk” to the splicer. The splicer keeps track of the cleave count. This will tell you when a blade should be changed. If a particular position is throwing bad cleaves, it keeps track to not use a certain position on the blade itself.

In conclusion, cleavers are a very important tool when working with fiber. Make sure to maintain them, and to prep your fiber correctly, and you will have a very successful job and you will save money and time.