Category: Fiber Transceivers

Optical transceivers, Active Optic Cables, data center switches, and cable management in data centers.

summary of 10G SFP + optical module

As we all know, SFP + optical module because of its small size, low cost and high density and other advantages are widely used in 10G Ethernet, is the current data center, enterprise park the most common 10G optical module. Today, Fiberland will introduce some of the 10G SFP + optical module types and the difference between them.
What are the types of 10G SFP + optical modules?
10G SFP + series optical modules include SR, LRM, LR, ER, ZR, BIDI, CWDM, DWDM and 10G electrical interface modules, all of which are LC duplex and comply with IEEE802.3ae, SFF-8472 and SFF-8431 Standard, the following are some of the specific details of the optical module.
1,10G SFP + SR optical module
10GBase-SR is one of the Ethernet specifications, the 10G SFP + SR optical module conforms to this standard specification, and the SR in this optical module model is short-range, which means that it is with multimode fiber Using a transmission distance of up to 300m. In addition, 10G SFP + SR optical module wavelength is 850nm, with low cost, low power consumption and small size, high density advantages.
2,10G SFP + LRM optical module
The 10G SFP + LRM optical module conforms to the 10GBase-LRM Ethernet specification, where LRM refers to the Long Reach Multimode. 10G SFP + LRM optical module can be used with OM1, OM2, OM3 multimode fiber, and mainly used for FDDI network and 10G data communication, its low power consumption and excellent EMI can also fully meet the MSA SFF-8431 standard. In addition, the upgraded version of the 10G SFP + LRM optical module is the SFP-10G-LRM2 optical module. The upgraded optical module has a transmission distance of up to 2km and is typically used for LAN connectivity.
3,10G SFP + LR optical module
The 10G SFP + LR optical module complies with the 10GBase-LR Ethernet specification, where LR refers to a long range, with a maximum transmission distance of 10 km on a single-mode fiber with a wavelength of 1310 nm, and a maximum of 25 km, But also has the advantages of miniaturization, low power consumption and long transmission distance.
4,10G SFP + ER optical module
The 10G SFP + ER optical module complies with the 10GBase-ER Ethernet specification, where ER is the Extended Range, its wavelength is 1550nm, and the transmission distance of up to 40km when used with single-mode fiber is a cost Very high ultra-long distance optical module, currently in the data center and enterprise park favored.
5,10G SFP + ZR optical module
The 10G SFP + ZR optical module conforms to the 10GBase-ZR Ethernet specification, but this specification is proprietary to Cisco. 10G SFP + ZR optical module model ZR refers to the longest distance (Ze best Range), which shows that this section of the optical module transmission distance is very far, and single-mode fiber with the transmission distance of up to 80km, This kind of optical module is widely used.
6,10G SFP + BIDI optical module
BIDI optical module is a single fiber bi-directional optical module, this optical module has SFP and SFP + two packages, the main difference is that the BIDI SFP + optical module rate is 10G, BIDI SFP optical module rate is 100 megahertz or gigabit. The BIDI SFP + optical module uses WDM technology and has two fiber jacks that need to be used in pairs to ensure proper operation. However, the benefits of this optical module can reduce the amount of fiber used in network deployments and greatly reduce network Deployment costs.
7,10G SFP + CWDM optical module
10G SFP + CWDM optical module is a coarse wavelength division multiplexing optical module, usually used with single-mode fiber. This optical module saves fiber resources by using CWDM technology, which significantly increases the flexibility, economy and reliability of the network, and the power consumption of this optical module is very small, which is 12.5% ​​of the 10G SFP + DWDM optical module.
8,10G SFP + DWDM optical module
10G SFP + DWDM optical module is a relatively rare high-speed, large-capacity dense wavelength division multiplexing optical module, usually used with single-mode fiber, the transmission distance of up to 80km, suitable for long-distance data transmission. This kind of optical module can meet the needs of large capacity and ultra long distance transmission for the multi-service operation and the future network expansion and expansion to provide a stable protection, but also supports a variety of networking mode, the nodes can also be between the wavelength Scheduling, with easy expansion of capacity, business access flexibility, high bandwidth utilization and high reliability and other advantages.
9,10G electrical interface module
The 10G electrical interface module is a photoelectric conversion module in the form of SFP +. The interface type is RJ45, usually used with super six or seven types of network jumper. The disadvantage of this optical module is that it does not support DOM function, and the transmission distance Is 30m, because the scope of application is not wide enough.
Two, five 10G SFP + optical module difference
In order to make it possible to distinguish between 10GBase-SR, 10GBase-LRM, 10GBase-LR, 10GBase-ER and 10GBase-ZR 10G SFP + optical modules, the following table lists the comparison tables for these optical modules.
10G SFP + optical module summary, you want to know here are!
Third, the common 10G SFP + series of optical module products
Optical Module Model Optical Module Name Fiber Type Center Wavelength Transmission Distance
SFP-10G-ER40 Huawei SFP-10G-ER40 SFP + 10G optical module SMF 1310nm 40km
0231A0A8 Huawei (Huawei) 0231A0A8 SFP + 10G light module SMF 1310nm 10km
OSXD22N0 Huawei Huawei OSXD22N00 SFP + 10G optical module MMF 1310nm 220m
LE2MXSC80FF0 Huawei (Huawei) LE2MXSC80FF0 SFP + million light module SMF 1550nm 80km
SFP-10G-USR SFP-10R-USR SFP + 10G optical module MMF 850nm 300m
OSX040N01 Huawei OSX040N01 SFP + 10G optical module SMF 1550nm 40km
SFP-10G-GE-SX SFP + Gigabit Optical Module MMF 850nm 550m
SFP-10G-LR Huawei SFP-10G-LR SFP + 10G optical module SMF 1310nm 10km
SFP-10G-ZR100 SFP-10G-ZR100 SFP-10G-ZR100 SFP-10G-ZR100 SFP
0231A0A7 Huawei (Huawei) 0231A0A7 SFP + 10G light module MMF 1310nm 220m
in conclusion
10G SFP + optical modules are widely used in next-generation mobile networks, fixed access networks, metropolitan area networks, and data centers. Fiberland fully meets the needs of customers with different transmission distances of 10G SFP + light through a strong inventory system and complete delivery services Module needs, need to buy friends welcome to contact us.

What are the categories of optical modules?

The arrival of the mobile Internet, the rise of the optical communications industry. We are inseparable from the optical communication. Fans can watch live on phone, people working outside can always talk to their parents any time, women can shop online. All of these bits and pieces of life we are all well received by the light. All of these we have benefited from optical communication.
optical module mainly use in optical communication industry. Its function is mainly photoelectric conversion, its transmitting end converts electrical signals into optical signals. And the receiving end converts the optical signal into electrical signal after the optical fiber transmission. Simply, optical module is the transfer device for transmitting and receiving electrical signals, is a bridge of the transmission of electrical signals.
we can see that the most common module are SFP and SFP+ optical transceiver. It won the good reputation with small shape and high performance. They are our best selling products.
Above are some common types of transceivers. Maybe you will be unfamiliar to the transceivers. In fact, it is closely related to our lives. The internet development provides great convenience for our quality of life, optical transceiver plays a very important role.

The Transmission Principle and Application Method of 40G QSFP + SR4 Optical Module

Now 40G network use has been very common, but many people do not know 40G optical module transmission principle and application. So today Fiberland to simple to share the cost-effective 40G QSFP + SR4 optical module transmission principle and application! 40G SR4 The QSFP + optical module is transmitted over four channels. The electrical signal is converted to an optical signal through a laser array. The photodetector array converts the parallel optical signal into a parallel electrical signal and then uses it with the MTP / MPO coupler. 40G optical connection.
1,40G to 40G transmission use In the case of
QSFP + SR4 optical module can be completed in the 40G fiber network environment for 40G to 40G transmission. The most simple and easy way to connect is to add two 40G ** machine 40G QSFP + SR4 optical module, and then use the MTP backbone multimode fiber jumper to connect the two optical modules to form a fiber link.
And in some special cases, in order to end at the same time and the same address are connected with the 40G optical module and increase the number of two fiber jumper and wiring difficulty. On the basis of the above-mentioned connection scheme, two 48-port 1U rackmount MTP chassis are added, and up to four 12-port MTP fiber optic panels can be accommodated in standard 1U rackmount chassis. This connection method is better Cable handling and higher density cabling is a great convenience.
2,40G to 10G transmission use
The 40G QSFP + SR4 optical module is a parallel optical module, and its four fiber interfaces are received together. Therefore, the 40G fiber signal can be divided into four 10G signals and then 40G to 10G transmission. On the high-density network cabling, the use of 48 MTP 1U rack chassis, connecting MTP-8LC branch fiber jumpers, you can dividend 4 10G signal transmission.
In order to better handle the cable, you can use 1U 96-port chassis, MTP box front of the four 10G LC port and HD MTP 40G port connected. Four 10G-SR SFP + connectors are plugged into the 10G ** machine / port and can be connected to the corresponding LC port for duplex network transmission between 40G and 10G.

What is the difference between an XFP transceiver and an optical transceiver?

by http://www.fiber-mart.com

What is an XFP transceiver?
XFP transceiver (photoelectric converter) is only used for photoelectric signal conversion, and protocol converter used to convert a protocol to another XFP transceiver is a physical layer device, is the fiber optic broadband into twisted pair device , There are 10/100 / 1000M conversion. Protocol converter there are many, most of which is basically a two-tier equipment, often encountered a RAD protocol converter is 2M E1 line into V.35 data lines connected to the router equipment, of course, 2M turn Twisted pair Ethernet, with 2M communication lines can be achieved within the scope of remote access and expansion. These two kinds of equipment on its maintenance is not much, as long as not burned generally not bad.
What is the Optical transceiver?
Optical transmitters and off receivers, optical transmitters are receiving electrical signals that are converted into optical signals transmitted in fiber access, while optical receivers. Network video server is to accept the analog audio and video signals, can be a direct signal from the camera and monitor head, after digital compression coding, popular MPEG-4, the network transmission of special equipment, video servers are generally equipped with Ethernet RJ- 45 interface and fiber FC interface, but also with SCSi interface external hard drive for front-end storage, he is commonly used in remote network monitoring system, the most equipment. Digital optical function is to transfer the image, voice and data signals to be digitized, and then these digital signals are multiplexed, the multi-channel low-speed digital signal into a high-speed signal, and this signal is converted to light signal. The optical signal is reduced to the electrical signal at the receiving end, the restored high-speed signal decomposes the original multi-channel low-speed signal, and finally the data signal is reduced to the image, the voice and the data signal.
The difference between XFP transceivers and optical transceivers
XFP transceiver and optical transceiver are the same place to be photoelectric conversion; and they are different is that the XFP transceiver is mainly transmission network, only photoelectric conversion, does not change the code, not the data for other processing, the transceiver is for Ethernet For example, run 802.3 protocol, only for point-to-point connection. In addition to the photoelectric conversion work, but also on the data signal reuse and demultiplexing, a core transmission video, 485/422 / audio / light volume / network, etc., usually out of the multi-E1 line. XFP transceiver applications such as banking, education and other networking. The SDH, PDH optical transceiver is mainly used for telecom operators, to provide many pairs of point to the point of the data circuit; Video Optical is mainly used for security monitoring, distance education, video conferencing and other video transmission requirements of relatively high real- Can transmit control, switch, voice, Ethernet and other signals to meet the needs of multi-service applications, so we sometimes call it Integrated Optical.

XFP transceiver perform better than standard

by http://www.fiber-mart.com

Fiber optic cable manufacturers through the attenuation and bandwidth of the two parameters to illustrate the characteristics of the product. Although these parameters are the basis of good performance, but they still can not fully reflect the performance of cable.
Because these cables are mainly used for local area networks, it is necessary to examine these cables in a LAN environment. For this purpose, the Nexans Data Communications Certification Center is testing multimode fiber from a system perspective.
In the evaluation of the use of different manufacturers (due to confidentiality agreement to fade the manufacturer’s name) to determine whether they are different in the optical transmission distance. The results presented in this paper are measured in G bits and 10 Gbit Ethernet. When the test is completed, the evaluation will also include the frame rate and the transmission distance on the multimode fiber when connecting the 1G, 2G, 4G and 10G Fiber Channel transceivers, respectively.
Test the configuration of the system
In order to accurately simulate the enterprise network, the use of commercial switches in the test. Figure 1 is a schematic diagram of a test setup using several different network configurations and the following devices: Spirent or IXIA bitstream generator, IXIA switch with 10GXENPAK interface, and switches from Cisco, Extreme, SMC and Asante.
IXIA or Spirent devices generate Ethernet frames and record the number of frames received. This can calculate the frame error rate (FER). In order to get a frame error rate of less than 10-13, at least 1012 packets should be transmitted. Each test takes a long time (about eight days for a 1G data stream and approximately one day for a 10G data stream).
The test system is configured with long and short wavelength GBIC transceivers and SFP transceivers operating at 1G. There are 10G optical modules for XENPAK and XFP. The trial used six different vendors’ commercial transceivers. In addition, the use of Berk-TekGIGAlite various grades of fiber. The schedule details the type and parameters of the fiber.
Test results and discussion
Test data show that the use of different fiber, different manufacturers of transceiver performance is very different. While all products meet or exceed the optical transmission distance specified by the industry standard, some products still have relatively good performance. For example, when using standard 700MHz · km multimode fiber (LB) and GBIC transceivers, vendors B and C transceivers can transmit 1000m, while vendor D can pass 2400m. Also, the 2000MHz · km fiber (EB) greatly improves the transmission distance of all measured transceivers.
Test results show that some transceivers and transponders performance is much higher than the provisions of the standardization organization. It also shows that even if the worst-case transceiver is used, the transmission distance on the existing fiber also exceeds the maximum value of the standard. Extending the transmission length of multimode fiber will reduce the total cost of gigabit and 10 Gigabit LAN cabling. Short wavelength (SX) transceivers can be used for longer distances of communication, the cost of these devices is almost one-third of long wavelength devices. Such a large cost advantage leads to the current use of multichode fiber (about 85%) and short wavelength devices. According to the results of Nexans, multimode fiber in the LAN can transmit 600 meters at 10G, and so far, theoretically, the maximum transmission distance of multimode fiber is 300 meters.
Why the theoretical value and the actual value of such a big difference. The reason is as follows: IE EE standard recommended transmission distance is calculated in the worst environment, and the actual fiber bandwidth may be better than the standard minimum. In the cable being tested, the bandwidth is greater than the minimum allowed. At the same time, the use of different light sources, fiber bandwidth will be greatly changed. In general, multimode fibers are initially designed to match light-emitting diodes, thus defining full injection bandwidth (OFL). The full injection bandwidth corresponds to the way in which the light-emitting diodes stimulate multiple modes in multimode fibers. For modern light sources, such as vertical cavity surface emitting lasers (VCSEL), with OFL is not accurate. Over the past decade, two technological advances have extended the transmission distance of multimode fiber:
● Since there is a serious chromatic dispersion and can not be modulated, the light emitting diode can not work at a rate of 622Mbit / s and above, and therefore must use the laser. For traditional networks, it is important to understand the transmission characteristics of multimode fibers connected to light-emitting diodes. It is also important to understand the transmission characteristics of multimode fibers connected to lasers for the current G-bit and even 10G-bit networks. The light-emitting diode excites all modes in the fiber, while the VCSEL only provokes a limited mode. So use a different bandwidth measurement method.
● Developed new methods for measuring the fiber bandwidth connected to the laser: finite mode injection (RML) and differential mode delay (DMD). Finite-mode injection refers to the fact that it is only a part of the end face of the core by limiting the optical signal, which is similar to the connection of VCSEL and multimode fiber. However, this measurement is not accurate because the intensity distribution of each VCSEL output is inconsistent and the different modes are excited in the fiber, which makes it difficult to measure the actual bandwidth of the fiber. In order to solve this problem, a differential mode delay measurement method is proposed. It requires the evaluation of all the patterns excited in the fiber and the calculation of the effective mode bandwidth (EMB), keeping the differential mode delay at a minimum to achieve greater fiber bandwidth, so the effective mode bandwidth is a more accurate way to measure the bandwidth.
As with fiber, XFP transceivers rarely work in the worst possible environment. Many manufacturers try to provide the remaining transmitters and receivers. The test results show that all manufacturers of XFP transceiver transmission distance exceeds the minimum standard.
Although most of the current Ethernet transmission rate is 10M or 100M per second, but the change is rapid. A large number of computers with 10M / 100M / 1000M network cards are being connected to the network, even if there is little need for such applications, G-bit Ethernet to the desktop will also become a business reality from the technology. Once the terminal connection rate reaches G bits per second, it is probably only a matter of time to upgrade to 10G bits per second to avoid the backbone becoming a bottleneck. In the choice of fiber optic cable and transceiver for the error rate and transmission distance left a larger margin, you can reduce the initial cost of the initial installation and use fees, but also make full use of bandwidth and coverage of the target users.

Is the XFP transceiver not a modem?

by http://www.fiber-mart.com

XFP transceivers and light cats are all photoelectric conversion products, many people are more easily confused. In fact, both from the working principle to the appearance of the existence of a big difference, it is easy to identify, the following Xiaobian for everyone to introduce the difference between the two.
The modem has the effect of modulation and demodulation. Light cat, also known as single-port optical transceiver, is designed for a particular user environment, it uses a pair of optical fiber for single E1 or single V.35 or single 10BaseT point to point type optical transmission terminal equipment. The equipment serves as a relay transmission device for the local network, a fiber terminal transmission equipment for the base station, and a leased line device. For the multi-port optical transceiver will generally be called “Guangduan Ji”, single-port optical transceiver is generally used in the client, similar to the commonly used wide area network (circuit) network with the baseband MODEM, and have called “light MODEM”, ” Light cat “,” light modulator “. Some people often mistakenly XFP transceiver or photoelectric converter as a light cat, in fact, this is a wrong name.
XFP transceiver, is a short distance twisted pair electrical signal and long distance optical signal interchangeable Ethernet transmission media conversion unit, in many places also known as the photoelectric converter. The product is generally used in the actual network environment where the Ethernet cable can not be covered and must be used to extend the transmission distance, and is usually located in the access layer application of the broadband metro network; while helping to connect the last mile of the fiber to the metro Network and more outside the network also played a huge role.