Category: Fiber Transceivers

Fiber optic services are the future of connectivity. Fiber optic cables have offered significant technology advancements in internet services for consumers. Those seeking a faster and more reliable connection are making the switch to fiber optics.

What is a Fiber Optic Cable?

When most people hear of fiber optic cables being used for their internet services, they may not know what their telecommunications company is referring to. A fiber optic cable is one that has glass fibers which are inside an insulated casing. The purpose of a fiber optic network is to reach longer distances and provide a higher performance than that of wired cables. Wired cables do not have the capability to have a large bandwidth and cannot transmit data over long distances. Fiber optic cables can support larger bandwidths and provide connectivity for much of the world’s internet and television.

How Do Fiber Optic Cables Work?

Strands of glass are inside of fiber optic cables, which are very thin. The center of these strands is where the light travels. One optical fiber has enough strength to carry three million voice calls. Fiber optic cables also have a unique feature to help them prevent loss of signal and to operate efficiently. This is known as cladding and is a layer of glass that helps to reflect light back in on itself. There are two main types of fiber optic cables functioning in a fiber optic network. These are known as single mode and multi-mode. Single-mode is known for thin glass strands, along with the use of a laser. Multi-mode is known for the use of LEDs.

What are the Advantages of Fiber Optic Cables?

While you could invest in long distance copper cabling, fiber optic cables have several advantages. A fiber optic network has a significant advantage over copper cabling due to being able to support a larger bandwidth. So, they support a higher capacity. With copper cabling, you may experience signal loss or need a signal booster. Fiber optic cables allow light to travel much further, limiting the need for boosters.

If you are looking for a boost in connectivity and more bandwidth, connecting to a fiber optic network is the solution. Fiber optic cables offer solutions that copper cabling can not compete with. Choose fiber optic cables to ensure you are operating at top speeds and maximizing connectivity.

Optical transceivers are available in various form-factors and different physical characteristics. It is important to have complete knowledge of the appropriate method of using an optical transceiver. This results in not only a long life and better durability of the optical transceiver but also ensures physical safety of the user. In this article, we will discuss the installation and removal of various types of optical transceivers. This article will cover the below optical transceivers:

SFP Transceivers

CWDM/DWDM Transceivers

SFP+ Transceivers

QSFP Transceivers

To understand the process of installing and removing an optical transceiver, one should have the basic understanding of the locking system the transceiver uses. Generally, there are four types of lock and latch systems that are commonly used in optical transceivers:

Bale Clasp

Mylar Tab

Actuator Button

Slide Tab

The above mentioned locking and latching systems are the basis of correctly installing and removing an optical transceiver without causing any physical damage to the transceiver. It must be mentioned here that the optical transceivers are hot-swappable modules, one doesn’t need to power off the device to install or remove it. Removing and inserting an SFP transceiver can shorten its useful life, so you should not remove and insert SFP transceivers any more often than is absolutely necessary.

The following steps are required to be followed to install a Bale Clasp optical transceiver:

Step 1: Attach an ESD-preventive wrist or ankle strap with any grounded equipment such as switch, rack or cabinet.

Step 2: Close the bale clasp before inserting the SFP transceiver

Step 3: Line up the SFP transceiver with the port and slide it into the port

Step 4: Verify that the SFP transceiver is completely seated and secured in its assigned port on the communication equipment by firmly pushing on it. You should hear a clicking sound as the SFP is correctly installed.

Removing an Optical Transceiver

The below mentioned steps are to be followed to correctly remove a Bale Clasp optical transceiver:

Step 1: Attach an ESD-preventive wrist or ankle strap with any grounded equipment such as switch, rack or cabinet.

Step 2: Disconnect and remove all interface cables and patch cords from the port

Step 3: Open the bale clasp on the SFP transceiver with your index finger in a downward direction

Step 4: Hold the SFP transceiver between your thumb and index finger and carefully remove it from the port

Step 5: Place the removed SFP transceiver on an antistatic mat or a static shielding bag

Other than the Bale Clasp transceivers, the Mylar Tab transceivers have a tab that you pull to remove the optical transceiver from a port. Similar steps are followed for installation and removal of a Mylar Tab transceiver apart from opening the bale clasp, the Mylar Tab is pulled to remove the transceiver.

Similarly, in the case of Actuator Button or Slide Tab transceivers, the removal is based on the correct usage of the lock and latch mechanism. It is usually recommended to have a thorough look at the accompanying product literature to understand the installation of any optical transceiver properly.

Laser Safety

Apart from the installation and removal instructions, one should also consider the safety requirements which will help to avoid any physical hazards. It should be considered as a rule to remove all the cables from the transceiver while installing or removing the optical transceiver from its port. In addition to this, the dust plug should always be in place as soon as the cables are removed from the transceiver. Similarly, while installing the optical transceiver, the dust plug should stay on until you are ready to plug in the cables.

Cleaning

Cleaning the terminals of the patch cords is a necessary practice as dust obstructs the light path and this results in a downgraded performance and higher error rates. Furthermore, the dust particles can cause permanent damage to the transceiver causing significant monetary loss and network downtime.

Electro-Static Discharge

Safety from electro-static discharge is also necessary while installing and removing any transceiver. The metallic body of the transceivers accumulate static charges over time which can sometimes cause physical injury to the person performing the task or the communication equipment itself as it is sensitive to excessive currents. Wrist or ankle straps are available at a very economical price and are absolutely necessary to avoid this hazard.

Patch Cords and Connectors

Using the appropriate patch cord and connector is also of great importance in achieving the connectivity through a fiber optic network. Some of the transceivers are meant to be used with multi-mode fiber and some are designed for single-mode fiber optic cable. Similarly, some transceivers use the SC type connector and some support the LC type connector. Usually, the type of patch cord and the type of connector is mentioned in the product description. It is highly recommended to correctly identify the patch cord that will be appropriate for the network keeping in mind the distance between the end points to be connected.

The need of quick provision of ports in data center environments is fulfilled by the use of multiport cables assemblies. This is very well achieved by a optical fiber cable strand, typically with 12 individual fibers and one MPO/MTP connector at the other end providing 6 parallel communication paths  and twice for 24 strand MPO cables. The quick provision is necessary in data centers between rack to rack  links. Using the connectors is a ‘plug and play’ solution with already tested patch optical budget properties.

MPO (Multi-fiber Push On) connectors are representing a standard for connecting technologies. In many cases, multi-fiber connector products are referred to as MTP connectors. The MPO connector is a multi-fiber connector that is defined by IEC-61754-7, “Fibre optic interconnecting devices and passive components – Fibre optic connector interfaces – Part 7: Type MPO connector family”; and TIA-604-5-D, ”Fiber Optic Connector Intermateability Standard, Type MPO”.

The term MTP (Multifiber Termination Push on ) is a registered trademark of US Conec. This is the term used by US Conec to describe their connector. The US Conec MTP product is fully compliant with the MPO standards. As such, the MTP connector is an MPO connector. The MTP connector is described by US Conec as, “a high performance MPO connector with multiple engineered product enhancements to improve optical and mechanical performance when compared to generic MPO connectors.”

Differences between MPO and MTP:

head shapes of the fibres differs: the MPO’s fibers are rectangular finish at head. The MTP fibres are round head terminated. For long use in terms of numbers of push in and pull up,  the MTP round head fibres maintain the lossless good coupling with female connectors.

You can not mate and have connectivity between the 12 strand MPO connector and 24 strand MPO connector.

12 Strand Applications

The new and improved next-generation MPO connector now delivers the optical, mechanical and environmental performance that service providers need to expedite the addition of fiber capacity and to support higher data-rate services. Among the numerous operational, financial and competitive benefits of using MPO connectors in the data center environment, are:

• optical insertion loss and return loss performance similar to single-fiber connectors

• maximum space savings for high-density fiber environments;

• reduced labor costs via fast, easy installation – because one 12/24 -fiber MPO connector replaces 12/ 24 single fiber connectors; and

• compliance with standards, i.e., IEC 61754-7; IEC 61755-3-31, IEC 61753-1

With so many service providers around the world now relying on the MPO connector to speed installation and deployment costs throughout their networks, it’s clear that the improved, next-generation MPO connector is ready for tomorrow’s high speed networks.

To achieve better optical performance, greater durability in the field and improved assembly quality, the design changes specifically include:

material changes to ensure reliable performance across a wide temperature range as specified in IEC 61755-3-31

extensively researching and refining the polishing process to achieve consistent low loss across all 12 fibers and replacing the flat ribbon cable assembly (for example, 0.178 inches x 0.08 inches) and its standard fiber with a round 3-mm cable utilizing single reduced bend radius fibers.

Practical implementations:

MPO/MTP styles cassettes have on MPO/MTP connector at one end, the fiber wires insides the cassettes rolled out and the individual  pair of fibre pairs at the other end.

End to end connectivity between cassettes is achieved with the use of trunk cables between cassettes.

The last connectivity pair is between cassettes individual pair of fibres terminations and switch or routers through a patch pair minding the Tx/Rx polarity.

The fight over 100G component market has been upgraded with the emerging of 100G QSFP28. This is an optical transceiver which can support 100G with the transmission mode of 4*25G. Usually, the move before was considered to be 10G→40G→100G. However, the new roadmap of 100G with QSFP28 is 10G→25G→100G or 10G→25G→50G→100G. One has a lot of questions for 100G migration. Why does 100G QSFP28 appear? Can 100GQSFP28 change our data center? The below article has answers to all your questions regarding QSFP28.

What QSFP28 offers?

Cost and power are considered the most important factors in data centers. A look back to the evolution of 100G modules in the past years has shown that things keep changing, from CFP to CFP2 and CFP4. All these changes are closely related to factors like cost and power.

High Port Density: The first generation of 100G transceiver was CFP and the drawback was large size. Then CFP2 and CFP4 were the next generations of 100G modules with a decreased size (quarter width of CFP) as compared to former.  QSFP28 with the same footprint and faceplate density as QSFP+ is even smaller than CFP4. Up to 36 QSFP28 can be installed on 1RU switch on the front panel, higher port density being a big advantage.

Low Power Consumption: QSFP28 needs the lowest power consumption for transmission as compared with other 100G transceivers. It is less than 3.5 W whereas other transceivers consume around 6 W to 24 W.

Lower Cost: As seen above with higher port density and lower power consumption, the 100G QSFP28 be cost-efficient. Implemented with 4 lanes, this can increase the transmission capacity of every lane from 10G to 25G, which can effectively decrease the cost for each bit.

How could QSFP28 be a game changer for Data Center?

The 100G can be reached directly from 25G escaping 40G with QSFP28. We read how 100G uplink is converged by only four 25G links. In addition, the 25G network has the same cabling structure as a 10G network, but here capacity is much larger. The following table lists the related components and the suggested applications for QSFP28.

QSFP28 Series

Cabling

Applications

100G SR4 QSFP28

MMF,MTP/MPO

100G to 100G up to 100 m

100G LR4 QSFP28

SMF, LC Duplex

100G to 100G up to 10 km

100G QSFP28 to QSFP28 DAC

100G to 100G up to 5 m

100G QSFP28 to 4x25G SFP28 DAC

100G to 25G up to 5 m

100G QSFP28 AOC

100G to 100G up to 10 m

The challenge for long distance connectivity

QSFP28 is the smallest 100G transceiver. It’s a fraction of the size of the CFP. It is best for short distances. However, for longer distances, there have been some recent breakthroughs in transceivers with DWDM capabilities. PAM4 being the most significant of all still requires amplification for every short distance. For distances over 5 to 6 km, needs dispersion compensation. With this, it can handle traffic up to 80 km.

While the need for connecting 100G traffic is growing, no single small transceiver can solve the problem of connecting switches between data centers and other longer distance sites. That’s why organizations consider full-blown, DWDM platforms to handle their 100G data center connectivity. Here the output of the QSFP28 transceiver is taken to run through a complex web of transponders, amplifiers, signal conditioning, multiplexers, and network management.

Conclusion

There are many ways to transmit to the 100G network. QSFP28 modules are the suggested methods till today but no one can tell what the future will like. Both IEEE and MSA have published standards for 100G QSFP28. Customers can select the range according to their applications. QSFP28 full family is now available at CBO.

Fiber optic transceiver is popular nowadays. SFP and SFP+ transceivers are most widely among other transceivers. These are used for both telecommunication and data communication applications. The availability in various small sizes with various types. Allows users to select the appropriate one to provide the required optical coverage over single-mode fiber or multimode fiber. Keeping this in mind, manufacturers have designed various types of SFP and SFP+ modules to satisfy different demands. People are adept to use the compatible SFP/SFP+ transceivers instead of the original ones. In this passage, we will discuss this subject and will give you a basic understanding of compatible SFP and SFP+ modules.

SFP – Small Form Factor Pluggable Module

SFP transceiver is a hot-pluggable module used for both telecommunication and data communications applications serving high-speed demands. This can also be considered as an upgraded version of the GBIC module. SFP is most often used for Fast Ethernet or Gigabit Ethernet applications supporting speeds up to 4.25 Gbps.

SFP + – Small Form-Factor Pluggable Module

SFP+, as the name says, is an enhanced version of the SFP that supports data rates up to 16 Gbps. SFP+ supports 8 Gigabit/s Fibre Channel, 10 Gigabit/s Ethernet, and Optical Transport Network standard OTU2. This is a popular industry format supported by many network component vendors.

Why should we use compatible SFP or SFP+?

When one purchase a network component, one takes many aspects into considerations, such as price, functions, capability, etc. In the following section will list two main reasons why one choose compatible SFP and SFP+

Cost

As discussed in the above sections, there is no doubt that SFP and SFP+ are indispensable components in network communication. But when it comes to cost one has to take a wise decision as a cost for these transceiver modules are keeping rising for users. If we move towards brands like Cisco, Finisar, Dell or any other brand for transceivers, etc. we will find that these are too expensive for those who are deficient in capital. However, in the market, we have compatible SFP and SFP+ that are available at least half price of the original one. For example, a Cisco SFP-10G-SR compatible transceiver is available for only 16 dollars in the market today.

Compatibility

Now the other part of the story is many manufacturers restrict their devices to accept only original SFP modules as identified by their vendor ID. Each of them is unique and holds its own information in EEPROM. Third-party SFP manufacturers have introduced SFPs with “blank” programmable EEPROMs so that It can be reprogrammed to match any vendor ID.  For example a Finisar FTLF1318P2BTL is compatible with the original Finisar SFP transceiver, having all the same features as the original one does.

Conclusion

With the increase in demand for transceivers, compatible SFP and SFP+ with lower cost and high compatibility are becoming a perfect choice for most users. But one should keep in mind to have a firmware check for compatibility before installing, or the modules can’t work in good condition. At CBO we always strive to provide optical products and has earned a good reputation among our customers. You can find all kinds of transceivers here, such as 10G SFP+, 100Base SFP, XFP, and so on. We offer a variety of SFP and SFP+ transceivers which are fully compatible with major brands at a very lower price. We promise every product here is individually tested, walks through the testing challenges and 100% compatibility.

Fiber link performance has become a significant thing as data centers have started migrating to 40, 100, 200 and even 400G. A dead fiber link or a problematic module can bring a devastating impact in the form of system downtime – something not acceptable at any cost. Through this blog, we will discuss the basics around fiber link models and budget considerations.

Fiber Link Models

According to the IEE 802.3 standard fiber link model should be referred to as the “fiber link cabling model.” In this model specifications and characteristics of the various optical networking, elements are defined. In short, the EEE 802.3 standard deals with the characteristics of; connector performance, maximum reach, fiber cable performance, maximum acceptable connection loss, etc.

One or multiple numbers of optical fibers are utilized in the fiber optic cabling channels to support an optical link. Optical links provide an interconnection between transmitters at the MDI. When the components used in the construction of an optical link comply with specifications defined in the standard as mentioned earlier, then we can anticipate stable and optimized link performance at the physical Ethernet layer. Thus, our networks and data centers will work faster and better and with no or very less downtime.

The standard for fiber link performance covers these aspects:

Mechanical specifications of the optical interface aka MDI

Physical transmission media including Singlemode (OS1/OS2) and Multimode fiber (OM1, OM2, OM3, OM4, and OM5).

Physical transmission media including Singlemode (OS1/OS2) and Multimode fiber (OM1, OM2, OM3, OM4, and OM5).

Power budget (the maximum allowable spread between transmitter power and receiver power in OMA)

Power losses incurred by transmission over the fiber and through the transmitter

channel insertion losses (specified in dB and generally caused by fiber attenuation)

Maximum reaches in term of distance for various fiber types

Cable performance (cable skew)

Fiber connector performance (maximum insertion loss and total connector loss)

The relationship between Power Budgets and Fiber Link Models

As we know, channel insertion loss can be defined as a tolerable fiber link loss. Here, it is essential to understand that the power budget and channel insertion loss are two different things. Following is a general equation that can be used in the calculation of the power budget.

Power Budget = allocation for penalties + channel insertion loss + additional allowable insertion loss.

What is the Significance of the Power Budget?

Well, when we operate with having multiple points of connection in any fiber cabling system the knowledge of power budget and link model becomes critical. As we have discussed above, link performance becomes a critical parameter as data center undergoes upgradation and migrates to superior technology. Overloaded, broken or open fiber links are a no-no in today’s cutthroat environment.

How can this Information be linked to Data Center Performance?

Futureproof Your Network

Many data center engineers find themselves confused on whether they should buy and deploy new fiber cables or recycle installed cable. In such scenarios, making the right choice becomes very important as next-generation speed and performance impact enterprises. To futureproof your networking infrastructure, you have to take the right decisions in a timely fashion.

Minimize the Cost of Ownership

You have to understand that the cost of ownership includes a lot more than the costs of cabling and transceivers. The maintenance cost is also considered as an integral element of the ownership cost. You can have saved much money on the maintenance front by utilizing high-performance cable. These cables offer superior link performance and much flexible cabling provisions for cross-connects. Thus, acquiring quality cable alone can help you in cutting down on regular maintenance expenditures.

Optimize Your Existing Networking Architecture

Understanding and analyzing your fiber link budget can assist you in optimizing your existing fiber link design. The fiber link budget enables you to access the channel insertion loss as well. As an example, consider shorter cable runs that can help you in creating more connection points. Whereas, you can achieve longer-distances by using low-loss fiber cable and low-loss connectors.