How to achieve up to 80km transmission with 40G QSFP+?

For data transmission, there is always a need for faster, longer transmission. With data rates growing up from 1G, 10G to 40G, 100G and even 400G, we can say the world is becoming smaller and smaller, and things are changing faster and faster with modern technology. However, with data rates growing up, transmission distance has not been growing as satisfactory as expected. Under 1G transceiver, max transmission distance can reach as far as 160km, and 120km under 10G transceiver. However, under 40G QSFP+ transceiver, the max distance is only 30km using a QSFP+ ER transceiver, which is quite disappointing.
For customers who have a need to transmit longer distance under 40G, where to turn to for help?
The answer is simple: come to fiber-mart, they have a cost-effective solution for you.
fiber-mart developed a QSFP+ Extender to support customer with up to 80km transmission.
This extender is designed and manufactured to fully meet QSFP+ MSA standard with working temperature: 0°~70°C and Power supply 4A, 3.3V. It has 1x QSFP+ port and 4x SFP+ ports. The QSFP+ port can be connected with customer’s QSFP+ ports using a QSFP+ DAC or AOC cable or QSFP+ transceiver. The 4x SFP+ ports are designed to connect with SFP+ ER to achieve up to 40km transmission and connect with SFP+ ZR for up to 80km transmission. This extender has a embedded fun inside for cooling, so the extender won’t get too hot with long-time operation.
A 2-slot 1U chassis as below is usually used together with this QSFP+ extender. One such chassis can hold two fiber-mart QSFP+ extenders. It is recommended to use only fiber-mart’s 1U chassis with this extender, because the dimension of fiber-mart’s 1U chassis is carefully measured to fit for this extender. The extender can also be rack-mounted with the two screws to make your application more tidy and convenient.
Like DAC cables, this extender also has passive design (PN: CVT-OEO-Q/4S0C) and active design (PN: CVT-OEO-Q/4S1C).
The difference between CVT-OEO-Q/4S0C and CVT-OEO-Q/4S1C is, in CVT-OEO-Q/4S1C, we add a CDR (clock data recovery) inside to enable the extender support longer distance with better performance. Whether to choose CVT-OEO-Q/4S0C or CVT-OEO-Q/4S1C is up to the Signal Integrity performance of your connecting switches. If your switch’s SI performance is good enough, CVT-OEO-Q/4S0C is recommended, because the cost is much lower than the CVT-OEO-Q/4S1C.
Special notice when using fiber-mart QSFP+ extenders:
When using with CVT-OEO-Q/4S0C, if connect the extender with your 40G switches using a QSFP+ DAC cable, the maximum length for the QSFP+ DAC cable recommended is 0.5 meter. Longer DAC cables may affect the performance or even lead to link issues. A QSFP+ AOC cable or QSFP+ transceiver is a good choice if you’d like to link up longer. Till now, no issue is found using a AOC cable or transceiver for the 40G link with either the CVT-OEO-Q/4S0C or the CVT-OEO-Q/4S1C.
When using with either CVT-OEO-Q/4S0C or CVT-OEO-Q/4S1C, make sure your switch is configured in 4 x 10G mode instead of 1 x 40G mode. Because both extenders are designed as a breakout 4 x 10G extender.
Both CVT-OEO-Q/4S0C and CVT-OEO-Q/4S1C can be used with both standard SFP+ ZR, and SFP+ CWDM 80km optics to achieve 80km transmission. Power consumption depends on the transceivers inserted instead of the extender.

How to choose a 40G QSFP+ Transceiver?

In the 40GbE and IB-FDR(56Gb) interconnect solutions, 40Gb QSFP+ transceivers account for a large percentage of the market share. QSFP+ SR4, QSFP+ eSR4, QSFP+ IR4 and QSFP+ LR4 are the most popular optical modules.
QSFP+ SR4 module(QSFP-40G-SR4) offers 4 independent transmit and receive channels, each capable of 10Gbps operation for an aggregate data rate of 40Gbps over 100 meters on OM3 multi-mode fiber(MMF) or over 150 meters on OM4 MMF.
QSFP+ eSR4 module(QSFP-40G-CSR4) that works in the same principle as SR4, can be considered an enhanced QSFP+ SR4. 40GBASE-eSR4 QSFP+ Modules extend the reach of the IEEE 40GBASE-SR4 interface to 300 meters and 400 meters on laser-optimized OM3 and OM4 MMF respectively.
QSFP+ IR4 module(WSP-Q40G–LR4L) works with signals over four wavelengths, which were multiplexed and demultiplexed within the device. QSFP+ IR4 supports link lengths of up to 2 kilometers on a standard pair of single-mode fiber(SMF) with duplex LC connectors.
QSFP+ LR4 transceiver(QSFP-40G-LR4): fiber components adopt CWDM technology to integrate signals: multiplexing and demutiplexing. QSFP+ LR4 only connects with one pair of LC duplex: Tx and Rx, supporting link length up to 10km.
There is a parallel single-mode type of QSFP+ LR4 optic we call it PSM(QSFP-LR4PSM), which transmits 4 transmitted signals and 4 received signals directly. An 12-core MPO/MTP fiber patch cord cable will be used to connect with it, links 1.4 to 10km.
QSFP+ LR4 can be connected with QSFP+ LR4 by LC duplex patch cords, as solution showed below. The central wavelengths of the 4 CWDM channels are different: 1271, 1291, 1311 and 1331 nm.
QSFP+ LR4 PSM can be linked with QSFP+ LR4 PSM on MPO SMF cable. If you would like it to be split in 4 pairs signals, that is easy. Use an MPO to 8LC SMF patch cord cable to connect with 4 SFP+ LR modules(SFP-10G-LR). See connect solution here:
Theoretically, the central wavelength of QSFP+ LR4 PSM is 1310 nm for all 4 channels. However, by the strong R&D ability, 10Gtek is available to customize 4 different CWDM wavelengths on customers’ requirements. For more information, please visit or contact us by e-mail.

Overview of 100G QSFP28 Transceiver

As the unprecedented network growth of data center, high-performance computing networks, enterprise core and distribution layers, and service provider application etc., a cost effected, high-density and low-power 100G Ethernet connectivity solution is in need urgently. Based on this, the 100G QSFP28(Quad Small Form-Factor Pluggable) transceiver is exactly what you need as a preferred network solution. The major features below are the most of advantages by utilizing 100G QSFP28 transceiver:
1.Techniques supported by all network devices manufacturers
2.Hot-pluggable to 100G Ethernet QSFP28 port
3.Compliant with 100G EthernetIEEE 802.3bm
4.Compliantto SFF-8665(QSFP28 Solution) Revision 1.8
5.Supports 100G data rate links of up to 30km
6.Low power consumption of max 4.5w
7.Smallest size
This full-duplex module offers 4 independent transmit and receive channels, reach to 70 meters by OM3 MMF(multi mode fiber) and 100 meters by OM4 MMF. The four channels of signal come thru the paralleled module via the MPO/MTP connector to complete the progress of transmission. QSFP28 transceiver as a entry level for 100G Ethernet solution, it’s a priority for short reach links such as data interchange centre or service centre.
100G QSFP28 LR4 Transceiver
The 100G QSFP28 Transceiver is the module designed for transmission span of up to 10km operated over SMF(single mode fiber) via LC connector. When start to run the module to connect with the data links, it will be converting each individual channel of electrical signal to LAN WDM optical signal and then multiplex all 4 channels of 25G signal into a output of 100G single channel, this is undergoing on the transmit side. While on the receive side that’s a reverse procedure via the demultiplex’s reaction i.e. 100G input of optical signal be demultiplexed to LAN WDM signal and then converted to 4 channels of 25G electrical signal.
LC and MPO/MTP Connector
LC Connector is very common for optical module application particularly for QSFP28 transceiver, which is a SFF(small form factor) connector developed by Lucent. The 1.25mm ferrule is precisely designed for high density cabling. In according to the diverse attributes it has been sorted into SMF(single mode fiber) LC & MMF LC connector and duplex and simplex LC connector.
MPO/MTP Connector involves 12 to 24 combined fibers within the single rectangular ferrule, it’s ubiquitously used for 100G Optical parallel module of MMF. This connector is much more complicated than others and categorised by key-up & key-down, and male & female MPO/MTP connector.
100G QSFP28 IR4 PSM Transceiver
Look into the definition of 100G PSM4 MSA(multi source agreement), 100G QSFP28 PSM4 transceiver is operating over 4 paralleled lanes(4 transmit and 4 receive) on each direction. At this point it’s same as 100G QSFP28 SR4 transceiver. But differently, it requires eight single mode fibers to coordinate the PSM4’s deployment in transmission links. The reach of up to 2km stay at a medium level between SR and LR modules, which makes it complemental to the 100G QSFP28 transceiver family, diversity of choice and much more economic.
100G QSFP28 CWDM4 Transceiver
By applying CWDM technology the 100G QSFP28 CWDM4 successfully integrates and multiplexes four differed wavelength(1270nm, 1290nm, 1310nm and 1330nm) into one SMF for signal transmission, similar to the process of 100G QSFP28 LR4 on the receive side. The incoming signal is demultiplexed to separated four channels over another SMF, therefore you can see the total usage of SMF is two rather than eight compare to 100G QSFP28 IR4 PSM transceiver. The reach of 100G QSFP28 CWDM4 Transceiver is up to 2km.
CWDM(Coarse Wavelength Division Multiplex) Vs DWDM(Dense Wavelength Division Multiplex)
Both CWDM and DWDM technology are in purpose for broadening bandwidth, maximizing usage of fiber and ultimately optimize the network. They can send various data flow simultaneously over a single mode fiber. CWDM is a flexible deployment for fiber networks especially for point to point topology of enterprise networks while DWDM is considered to connect the metropolitan network, interconnecting data center and financial service network. Following is a table display to summarise the main differences between CWDM and DWDM.
100G QSFP28 ER4 Lite Transceiver
What if customers have demand to build a ultra-long link 100G network beyond 10km 100G QSFP28 LR4 transceiver? The answer is absolute! The 100G QSFP28 ER4 Lite transceiver is exactly born to meet your demand of this specialty. It adopts EML laser in transmit side and multiplexes/demultiplexes four lanes signal come from four wavelength(1295.56nm, 1300.05nm, 1304.58nm and 1309.14nm) which is operating over one single mode but dual fibers. Particularly there is TEC(thermo electric cooler) inside the construction to steady inner temperature and prevent wavelength from flowing. The enhanced reach of 100G QSFP28 ER4 Lite is 30km or above.

100G QSFP28 Transceivers, Which Is Needed for Your Networking Infrastructure?

The 100G QSFP28 modules are the most popular 100G transceivers on the market today. Among many factors, this is primarily due to their low production cost, efficient size, and high output. This article is going to go over the specs, versions and details that make the QSFP28 market giant that it is today. currently manufactures mainly 4 modules of the 100GB QSFP28: SR4, LR4, CWDM4, and IR4 PSM. Let’s look at what each one provides.
The runt of the 100GB transceivers is the the SR4. While SR stands for “short range” the transceiver still outputs the same 100GB/s speeds as the other drives. QSFP28 SR4 transceiver uses an MTP/MPO interface, using a multi-mode cable for short distances. Both the IR4 PSM and the SR4 use a 12-fiber MTP/MPO patch cable. The advantage of the SR4 is its economical price point. While it doesn’t have the longest distance, it does provide the same top quality speed, only for a fraction of the cost of the higher-end modules. And like all modules, it is fully tested on Cisco & Accton devices for application. has SR4s in-stock and ready for delivery.
The top end of the QSFP28 product line is the LR4. The LR4 is a full duplex LC module that provides everything you could want in a transceiver. The duplex function allows the LR4 to work as both a transmit and receive path in one module. On the transmit side, 4 lanes of high-end optical signals push out over a staggering 25GBps per lane. On the receive side, the 4 lanes can de-multiplex data streams with a fully integrated de-multiplexer, transforming that data into CAUI-4 electric output. The module has a maximum link length of 10km and operates on 1 single-mode fiber cable with duplex LC connector. All LR4 modules have been fully tested on Cisco & Accton devices to make sure they work on your system. This is the best of the line in 100GB transceivers from We always have them in-stock and provide lightning fast delivery.
Along with the LR4, the CWDM4 is another full duplex LC module. Along with the LR4, it pushes out over 100GB from its 4 lanes of high-end optical transmitters and de-multiplexes with the same fully integrated de-multiplexer. The advantage of both the LR4 and CWDM4 modules is the easy of which upgrading can be done. Both modules run on common single-mode duplex LC patch cable requiring no need to replace all of those fiber patch cables. That saves money, headaches and downtime with trying to replace all of that cable. You can also save space with removable “push-pull” tabs. Like all modules, it is fully tested on Cisco & Accton devices. The main difference between the CWDM4 to the LR4 is the maximum link length with the CWDM4 having a max length of 2km, suitable for most common demands.
Moving from our duplex LC modules, we get the IR4 Parallel Single Mode Transceiver. The IR4 is an MTP/MPO interface transceiver with 4 independent full-duplex lanes. Along with its LC brothers, it puts out at over 25GB/s per transmit lane and converts input signals with its parallel optical receiver lanes. The transceiver accepts input signals compatible with Common Mode Logic (CML) levels. You also don’t need to sacrifice distance with a 2km range. The IR4 PSM uses single-mode cable meaning it can work over long distances. Like all modules, it is fully tested on Cisco & Accton devices. The IR4 PSM is a great choice for customers that don’t want to upgrade to the more expensive LC modules but still high quality speed and distance.

Media Converter vs Network Switch

Media converter and network switch are both widely used in today’s high speed network applications. In some scenes, one can used to replace another one. Then, which one should I choose for my network? What is the difference between media converter and network switch? This post will cover the knowledge of media converter and network switch, and explain the difference between them.
1.What is Media Converter?
Media converter is a very simple networking device that used to convert electrical signal utilized in copper cable to light signal for fiber optic cabling and vice versa. It is essential to have the fiber optic connectivity if the distance between two network devices is greater than the copper cabling’s transmission distance. They were introduced to the industry in the 1990s, and played an important part of fiber types of cabling system in connection with existing copper-based wiring system. They are also used in metropolitan area network (MAN) access and data transport services to enterprise customers.
2.What is Network Switch?
A network switch is a computer networking device that connects devices together on a computer network by using packet switching to receive, process, and forward data to the destination device. Usually, a switch serves as a controller, enabling networked devices to talk to each other efficiently. Through information sharing and resource allocation, switches save businesses money and increase employee productivity. And the network switch operates at the data link layer (Layer 2) of the Open Systems Interconnection (OSI) model called layer 2 switch, which operates at the network layer (layer 3) of the OSI model called layer 3 switch.
3.DifferencesBetween Media Converter and Network Switch
In fact, both a media converter and a network switch today can act and perform the same functions. And Both of them operate within the OSI model which is hierarchical and structured in the form of layers such as layer 1, layer 2, layer 3 and so on. A clear understanding of what OSI layers do, and what the differences between devices operating at different layers are, will help you learn about the difference between media converter and network switch.
 Layer 1: Media Converter
Layer 1 refers to the Physical Layer, which is the first layer of OSI model. It defines electrical and physical specifications for devices, and the relationship between a device and a transmission medium, such as a copper or optical cable. If a device only operates at Layer 1 of the OSI model, that is usually a media converter. Working at this layer, media converter is used to convert electrical signals and physical media, but don’t do anything for data changes. These media converters usually have only two ports to convert the incoming electrical signal from one cable type and then transmit it over another cable type, such as UTP to fiber and so on.
Layer 2: Media Converter and Network Switch
Layer 2 refers to the Data Link layer of the OSI model. The Data Link layer is concerned with moving data across the physical links in the network. Both media converter and network switch can operate at layer 2. The difference between a layer 2 media converter and a layer 2 network switch is the number of ports. Usually, a device with two or three ports is called a media converter. Compared with layer 1 media converter, a layer 2 media converter can be thought as an advanced converter. A device with four or more ports is called a network switch, and compared with layer 3 switch, a layer 2 switch is usually a basic switch.
Layer 3: Network Switch
Layer 3 refers to the Network layer of the OSI. The Network layer is concerned with knowing the address of the neighboring nodes in the network, selecting routes and quality of service, and recognizing and forwarding to the Transport layer incoming messages for local host domains. Only network switch can operate at Layer 3. Switches operating at Layer 3 are smarter than Layer 2 devices and incorporate routing functions to actively calculate the best way to send a packet to its destination.
Media converters can be used anywhere in the network to integrate newer technology with existing equipment to support new applications, technologies and future growth. Layer 2 and layer 3 network switches are also widely deployed in enterprise and data center for higher speed and more capacity. provides both media converters and managed network switches for your option. You can choose the most suitable one according to your specific needs.

What You Should Know About 40G QSFP+ BIDI Transceiver?

Whether in Ethernet network, data center or in IT infrastructure, the demand for higher transmit data rate, larger capacity, wider bandwidth and superior performance will never slow down. As nowadays more and more devices and data are accessed to Ethernet such as cloud computing, super computer, IDC, enterprise server room and your handy mobile phone, which may explain why so many device and service providers consider migrating from 10G to 40G is such a advisable movement. By following the trend, this article will have brief introduction for 40G QSFP+ BIDI transceiver, which enables an optimized network solution to implement 40Gbp/s data rate.
Introduction of 40G QSFP+ BIDI Transceiver
BIDI transceiver known as bidirectional transceiver, which is operating over two different wavelengths to transmit in both directions over just one fiber. To distinguish, BIDI transceiver has one connecting port only while there are two ports in ordinary optical transceiver. Why the signal of different center wavelength can be transmitted and received in both directions within BIDI transceiver? That is important to know WDM technology i.e. wavelength division multiplexing, the wavelengths like 1310nm/1550nm, 1310nm/1490nm, 1510nm/1590nm are mostly popular adopted in BIDI optical module.
40G QSFP+ BIDI transceiver, by it’s two 20G signal channels, each channel can transmit and receive two wavelengths synchronously over one strand MMF(Multi Mode Fiber) with a transmitted distance of up to 100m by OM3 and 150m by OM4. Moreover, it can deploy and re-assemble the current 10G cabling system to adapted to 40G network connection. That is to say, by making use of 10G cable plant you can obtain a 40G speeds of date rate without employ any other devices.
Operational Principle
Different from ordinary 40G optical transceiver, 40G QSFP+ BIDI transceiver has critical electron component of WDM couplers, which is functional to combine and separate data over one fiber based on the wavelengths of the light. The processing of two directions on one fiber is happened at the both ends of MMF with duplex LC connector which is showing as below :
Features of 40G QSFP+ BIDI Transceiver
40G QSFP+ transceiver plus BIDI technology is a very high-performance transceiver, which is quite in need to servers and end users that require the connectivity of 40G Ethernet.
Much more Cost-effective by less fiber cables and patch panels compared to counterpart transceivers with a limited transmit length of up to150m, meanwhile save space in data centers.
Compliantwith the QSFP+ MSA specification, enabling customers to use it on all QSFP+ 40-Gbps platforms to achieve high-density 40 Gigabit Ethernet networks.
Offers customers a compelling solution that enables reuse of their existing 10 gigabit duplex MMF infrastructure for migration to 40 Gigabit Ethernet connectivity.
40G QSFP+ BIDI vs. 40G QSFP+ SR4 Transceiver
40G QSFP+ SR4 transceiver delivers signal over four independent full-duplex channels by utilizing MPO/MTP Connector and MMF. Same length with 40G QSFP+ BIDI, available reach of up to 100m over OM3 optical fiber jumper and 150m over OM4 jumper.
Even with the same distance, 40G QSFP+ BIDI transceiver removes 40G cabling cost barriers in data center networks. It provides immense savings and simplicity compared to 40G QSFP+ SR4. The main differences between the two kinds of transceiver are connections and structured cabling, see below figures for further comparison:
40G QSFP+ BIDI transceiver is a perfect solution in scenario like data centers where require short-reach, limited fibers and saved operation space of 40G connectivity. And the deployment of 40G BIDI transceiver can increasingly expand the existing bandwidth capacity and help to promote economical and superior performance of optical network.

How to Locate Fiber Problem in One Second?

Fiber Visual Fault Locator is a kind of device which is able to locate visual faults including tight bends, breaks and bad connectors immediately. You can diagnose and repair simple fiber optic link problems with the help of Fiber Optic Visual Fault Locator. This laser-powered VFL enables you to locate fibers, verify continuity and polarity, and helps you find the location of breaks in fiber optic cables, connectors and splices.
The Visual Fault Locator, model BWJ650-10, can be operated in continuous or flashing modes for easier identification. This fiber optic VFL is compatible with 2.5mm and 1.25mm fiber optic connectors(with optional adapter, watch video below), providing you with easy connectivity. You will find that this ruggedly constructed fiber optic Visual Fault Locator stands up to the demands of field-testing. This fiber optic testing device is housed in an ergonomic case that survives drops, impacts and vibrations The fiber optic Visual Fault Locator also features long battery life for hours of use. BWJ650-10 can locate fault up to 10km in fiber cable(BWJ650-20, up to 20km), with compact in size, light in weight, red laser output.
Product: Fiber Visual Fault Locator BWJ650-10
Wavelength: 650 ± 10nm
Output Frequency: 10mWDetect
Operating Temperature: 0~60°C
Accelerates end-to-end fiber continuity checks;
Speeds fiber tracing and identification;
Aids in location of fiber faults, tight bends, breaks and bad connectors;
Connects to 2.5mm standard connectors;
Connects to 1.25mm LC connectors (with optional adapter).