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Video SFP Optical Transceiver:Do You Know These?

SFP optical transceiver is familiar to most of people. By comparison, video SFP optical transceiver, also regarded as digital video transceiver or Serial Digital Interface(SDI for short)video transceiver, is not more familiar to us. Therefore, in this post, Gigalight(gigalight.com) will have an introduction to it in detail for you.

What Is Video SFP Optical Transceiver?

Similar to SFP optics, video SFP optical transceiver is small, hot-pluggable one, matching with fiber optic cables for application. But what is different from SFP optics is that video SFP optics is used for video transmission. It is known that the video is transmitted in a uni-directional way, which means that the video link can be simply transmitted via a signal fiber or coax signal. The factor has been the main drive force to create different pinouts for the video SFP. Therefore, video SFP optical transceiver can have either two optical transmitters/two optical receivers or one optical transmitter and one optical receiver.

Why to Use Video SFP Optical Transceiver?

With the rapid evolution of the broadcast video transmission for high-capacity HD and Ultra High-Definition (UHD) digital transmission, it is necessary to produce a kind of fiber optic transceiver that can achieve high level in video image transmission. With SDI interface, video SFP transceiver is able to support SDI video pathological signal and ensure the quality of video transmission.

Types of Video SFP Optical Transceiver

Video SFP transceiver can be divided into various types according to different factors. For example, according to operating wavelength, they can be classified into 1310nm, 1490nm, 1550nm and CWDM wavelengths video SFP transceivers; according to operating rate, they can usually be divided into 3G-SDI, 6G-SDI and 12G-SDI video SFP transceiver. The following is about the respective introduction to these three optics.

3G-SDI Video SFP optics is with a data rate up to 3Gbps, specifically designed for high performance in the presence of SDI pathological patterns for SMPTE 259M, SMPTE 344M, SMPTE 292M and SMPTE 424M serial rates. It is generally applied for television broadcasting. However, with the advancement of technology, it is also widely applied in global security applications such as high-end surveillance or unmanned systems, allowing simple designs or upgrades with full HD cameras.

The data rate of 6G-SDI video SFP optics is twice that of 3G-SDI transceivers, which means it is possible to deliver a payload of 6 Gbps. Therefore, they are not only designed for SDI pathological patterns for SMPTE 259M, SMPTE 344M, SMPTE 292M and SMPTE 424M serial rates but also for SMPTE 2081. 6G-SDI video SFP transceiver is often used in camera, video, security monitoring applications and 4K /HDTV/SDTV service interfaces.

12G-SDI video SFP transceiver is specifically designed for high performance in the presence of SDI pathological patterns for SMPTE 259M, SMPTE 344M, SMPTE 292M, SMPTE 424M, ST2081 and ST-2082 serial rates. They are mainly used for SMPTE ST-297-2006, ST2081 and ST-2082 compatible electrical-to-optical interfaces and UHDTV/HDTV/SDTV service interfaces.

On account that 3G-SDI, 6G-SDI and 12G-SDI are digital baseband signals, long-distance transmission on copper cable will definitely be limited. Thus, optic fiber cables, 3G-SDI, 6G-SDI, 12G-SDI video SFP transceivers are perfect for long-distance video transmission.

Applications of Video SFP Optical Module

Currently, video SFP optics is mainly used in these aspects:

1. Applied in HD Camera or Monitor System

There are usually multiple HD end-devices in HD camera or monitor system. Therefore, one HD video matrix can be used as one end which provides multiple video SFP ports, and multiple HD-SDI equipments can be used as the other ends.

2. Applied for Broadcast Video Transmission

Broadcast video transmission needs high-density cabling. Thus, HD-SDI equipment with high-density video SFP ports is needed.


Above all is about the introduction to the definition of video SFP optics, types of video SFP optics, applications of video SFP optics. Generally speaking, video transmission plays a key role in the daily life. To ensure the high-level video digital transmission, video SFP optical transceiver is in great favor. In addition, for the above mentioned video SFP optical transceiver module, Gigalight currently can provide or customize 3G-SDI SFP, 6G-SDI SFP+, 12G-SDI video SFP+ optical transceiver for you. More information is at Gigalight official website.
publié le jeudi 19 avril à 08:48, aucun commentaire.

Something New about 100G Optical Transceiver in These Perspectives

As the network is gradually upgraded from 25G-40G-100G, people have more demands on 100G optical transceiver to deploy data centers or Ethernet. Maybe most people are familiar with 100G optical transceiver module on account that it is widely applied in the daily life. However, if we know it from these other perspectives, something new will be found. Then there is an introduction to it in this article from Gigalight. Let's have a look at it together.


The Development Process of 100G Optical Module

The earliest-generation 100G optical module is CFP developed in 2010. Then IEEE published other three standards of 100G optical module: 100G SR10, 100G LR4 and 100G ER4, respectively supporting 100m, 10Km and 40Km transmission. After that, the 100G SR4 project was put forward to be added to the IEEE standard, but it was not implemented on account that it was not reached a consensus in 2013. Till 2016, most of 100G optical modules used in various data centers adopted 25Gbps Serdes program. Gradually, 100G optical module adopting 50Gbps Serdes program of was developed.


Types and Advantages of 100G Optical Module

The form factors of 100G optical transceiver mainly include CFP/CFP2/CFP4, 100G QSFP28. For their comparison in advantages, the main factors to be considered are the cost and power consumption of data centers.

The following is the respective introduction to advantages of 100G optical transceivers.

1. CFP optical transceiver supports full C-band wavelengths tunable and can complete the link detection. It uses a common optical dual-binary modulation ODB, convenient for setting, power consumption less than 24W.

2. The volume of CFP2 optical transceiver is half of CFP. Its integration level is 2 times that of CFP. It can complete stable receiving sensitivity in the range of wide dynamic input based on SOA, fully supporting a CFP optical transceiver. In addition, its power consumption is lower than 9W.

3. The volume of CFP4 optical transceiver is half of CFP2. Its integration level is twice that of CFP2, the port density of front panel is also the double of CFP2. CFP4 optical transceiver is conformed to the MSA protocol, supporting the same rate as CFP/CFP2. Its transmission power increases significantly, but the power consumption drops significantly, only about half of the original. Besides, the system cost is lower than that of CFP2. Simultaneously, CFP4 optical transceiver completes 100G transmission via 4 * 25G channel, with higher transmission power and higher stability.

4. The form factor of QSFP28 optical transceiver is smaller than that of CFP4 optical transceiver. The power consumption of QSFP28 optical transceiver usually does not exceed 3.5W. The adoption of QSFP28 optical transceiver can make it achievable to upgrade network from 25G to 100G not through 40G, so that the cost is lower.


Challenges That 100G Optical Module Faces

1). Nonlinear Effects: compared with the nonlinear effects of 10G/40G optical transceiver, that of 100G optical transceiver is more chaotic.

2). PMD Tolerance: under the same conditions, the PMD (Polarization Mode Dispersion) tolerance of 100G optical transceiver module is 1/10 of 10G optical transceiver module, accounting for 4/10 of 40G optical transceiver module. Therefore, the coherent reception plus digital signal processing should be chosen for application.

3). CD Margin: under the same conditions, the dispersion tolerance of 100G optical transceiver only needs 1/100 of 10G optical transceiver, accounting for 16/100 of 40G optical transceiver. Therefore, 100G optical transceivers can use dispersion compensation technology to complete the dispersion compensation for each wavelength in the electric field or the optical domain.

4). Channel Distance: the DWDM system that supports the range with 50GHz wavelength has been popularized. 100G optical module needs to satisfy the condition that it supports the distance of the 50GHz wavelength, so the code pattern of the high-spectrum power should be used.

5). OSNR (Optical Signal to Noise Ratio): when the code type is same, the 100G optical module are required to increase 10dB higher than 10G optical module, and 4dB higher than 40G optical module. Therefore, the code type with a low OSNR tolerance and a FEC algorithm with high coding efficiency are needed.



It is believed that the answer is clear in your mind. Seen from the above viewpoints, in the development process of 100G optical transceiver module, although many 100G optics with different form factors emerge to bring effective solutions for 100G Ethernet or data centers, by virtue of their advantages in many aspects, and 100G optics actually faces various challenges. Above all is the contents that Gigalight wants to share. More details/solutions are at gigalight.com.



publié le mercredi 18 avril à 06:00, aucun commentaire.

How Much Do You Know about Metropolitan Area Network?

With the development of network tech and other communication techs, metropolitan area network(MAN) appears to solve the problems of LAN(Local Area Network)interconnection and make up for the disadvantages of WAN(Wide Area Network). Maybe there are still many people unfamiliar with MAN although it is widely used in the daily life. Then in this post, the definition of MAN, types of MAN, advantages of MAN will be introduced by Gigalight (gigalight.com).


The Definition of Metropolitan Area Network

A Metropolitan Area Network (short for MAN) is a large computer network in the large geographical area such as several buildings, a large university campus or even the entire city. MAN is larger than LAN but smaller than WAN. A MAN (Metropolitan Area Network) usually incorporates several LANs to form a bigger network. The purpose of MAN is to provide the link to the internet in the long run. The MAN backbone comprises of an optical fiber set-up.


The MAN’s communication links and equipments are generally owned by either a consortium of users or by a single network provider who sells the service to the users. The latter usage is also sometimes referred to as a campus network. The IUB network is an example of a MAN.  Generally speaking, MAN does not belong to any particular organization, in most cases, a group of users or a provider who takes charge of the service has its connecting elements and other equipments.


Types of Metropolitan Area Network

The most widely used technologies to develop a MAN (Metropolitan Area Network) are FDDI (fiber distribution data interface), ATM (Asynchronous Transfer Mode) and SMDS (switched multi megabit data service). ATM (Asynchronous Transfer Mode) is the most frequently used among them. ATM (Asynchronous Transfer Mode) is a digital data transfer technology. It was developed in 1980 to improve the transmission of real-time data over a single network. ATM (Asynchronous Transfer Mode) works just like cell relay system, where data is separated in the form of fixed equal sized packets and is transferred overtime. The purpose of ATM (Asynchronous Transfer Mode) is to access clear audio and video results during a video conferencing. The attributes of ATM has enabled it to become a base of wide area data networking.


Advantages of Metropolitan Area Network

1. The biggest advantage of MAN is the bandwidth (potential speed) of the connecting links. MAN is extremely efficient and provides fast communication via high-speed carriers, such as fiber optic cables. MAN can cover a wider area than a LAN, It is a large network connectedness, information can be disseminated more widely, rapidly and significantly. MAN is usually operated at airports, or a combination of several pieces at a local school.

2. MAN falls between the LAN and WAN. Therefore, it increases the efficiency of handling data at the same time that it saves the cost to establish a wide area network.

3. Due to the use of LAN technology with active switching elements, the transmission latency in the network is low.

4. MAN offers centralized management of data. It enables you to connect many fast LANs together. Telephone companies worldwide have facilitated the transmission of data with the help of an underground optical fiber network. These optic fibers increase the efficiency and speed of data transfer. The optical fibers enable you to access a speed of almost 1000mbps. If you develop a WAN of 1.45 mbps, its cost is more than what it gives you. However, when you establish metropolitan area network, it offers you the speed of 1000mbps as a whole at the lowest cost.



Above is about the introduction to the definition of MAN, types of MAN, advantages of MAN. It is believed that one will have some certain knowledge of it after reading this article. In addition, Gigalight, as the optical interconnection design innovator, provides various series of products for MAN, such as SFP, CSFP, XFP, SFP+, SFP++, SFP28, CFP/CFP2/CFP4, QSFP28 optical transceiver and other series. More details are at Gigalight official website(gigalight.com).
publié le lundi 16 avril à 10:00, aucun commentaire.

LAN vs. WAN: What Is the Difference?

Although LAN and WAN are two types of networks commonly applied in the daily life, and there are still many people are confused of the difference between LAN and WAN. To remove the doubts for those, Gigalight will make a comparison between them in this article.

The Definition of WAN
WAN, the abbreviation of Wide Area Network, is a type of computer network that covers a wide geographical area and communicated area across metropolitan, countries, national boundaries, across regional and over a long distance. It use leased telecommunication lines. WAN are often used by business and government agencies to connect to achieve strong network communication among employees, clients, supplier and buyers from various parts of the world. Due to its wide coverage, LAN is hard to manage and organize. Moreover, the maintenance cost of WAN is also high compared with PANs, LANs, CANs, and MANs. In addition, WAN uses technologies such as SONET, Frame Relay, and ATM. It also allows different LANs to connect to other LANs via technology products such as routers, hubs and modems. There are four main options for connecting WANs: leased line, circuit switching, packet switching and call relay.

The Definition of LAN
LAN, the abbreviation of Local Area Network, is a type of computer network that covers a small geographic area such as home, office, a small town, any building or institute. Due to the localized nature, the data transmission rate is very high in LAN, and it can be controlled and managed by one person or small-size organization. The maintenance cost of LAN is also very low. Besides, a LAN network includes a couple of computer systems connected with each other, with one system connected to a router, modem or an outlet for internet access. The LAN network is built using inexpensive technologies products such as Ethernet cables, network adapters and hubs. However, other wireless technologies are also available to connect the computer via a wireless access.

LAN vs. WAN: What Is the Difference?

The main difference between LAN and WAN is that LAN is a type of computer network that covers a small geographic areas, while WAN is a type of computer network that covers a broad geographical area such as metropolitan, countries, regional, etc. Except for this, they also differ from each other in these aspects:

Coverage Ranges: the coverage ranges of LAN and WAN networks are different. LAN connects computers in a small physical area, while WAN connects larger areas situated in different geographical locations.

Network Speeds: the network speeds of LAN and WAN are varied. WAN is typically slower than LAN due to the data transmission distance. The maximum speed of LAN is 1000 Mbps while WAN can only reach 150 Mbps.

Security Level: as for the security level, LAN seems to be better than WAN. Because WAN involves more people into the interconnection, there is a greater possibility of network issues.
Costs: due to the smaller network coverage, setup and maintenance costs for LAN are usually lower than that of WAN.

By comparison, the difference between LAN and WAN are obvious. Both of them have their own advantages and disadvantages. When it is hard to make a choice between them, the answer may be clear considered from the perspective of distance. Although LAN has more benefits than WAN, you still need to choose WAN when it comes to large areas networking.

About Gigalight:
Gigalight is a design innovator in global optical interconnect field. A series of optical interconnect products include: optical transceivers, passive optical components, active optical cables, GIGAC MTP/MPO cabling, cloud programmers & checkers, etc. Three applications are mainly covered: Data Center & Cloud Computing, MAN & Broadcast Video, and Mobile Network & 5G Optical Transmission. Gigalight takes advantage of its exclusive design to provide clients with one-stop optical network devices and cost-effective products.
publié le vendredi 13 avril à 09:46, aucun commentaire.

What Is the Advantage of COB (Chip On Board) Tech?

It is known that COB (Chip On Board) is not a fresh technology dating back to the source. Although it has not been the mainstream tech in optical communication industry as before, and it still can not be ignored for the packaging of high-rate multimode 40G/100G optical transceiver module on account that it is helpful to achieve smaller form factor and higher density. In today’s post, Gigalight will talk about the advantage of COB tech.

The Definition of COB (Chip On Board) Tech?

Chip On Board, or COB, is actually the chip technology mounted directly on a circuit board as opposed to being socketed. The core processes of COB model consist of DICE BOUND and WIRE BOUND. This kind of circuit board is also known as a “glop-top” for the blob of protective epoxy that protects and insulates the chip and its connections. All of the chip’s connections are hard-wired.

What Is the Advantage of COB (Chip On Board) Tech?

1. Low in Cost:

COB tech is aimed to reduce costs and saving investments. Due to that uncovered IC chip is directly attached on the printed circuit board, wihout separate packaging for IC chip, so that the cost is reduced. And making the circuit interconnection line directly on the IC chip saves more costs than advanced packaging. Therefore, COB tech tends to be developed toward more improved IC chip.

2. Small in Size:

On account that IC chip is smaller than components with leading spacing, COB has outstanding advantages in space saving. dual-in-line package (DIP). The size of wire bonding chip without IC packaging is smaller than that of the dual-in-line packaging(DIP), covering about 1/4, saving more space than Leadless Chip Carrier(LCC)packaging, shrinking the size. COB tech can also be used in the application fields that other packagings have no way to achieve it.

3. With Good Sealing:

With the coefficient of thermal expansion between sealing materials and printed circuit board more and more matched, the reliability will be further improved. In the past, on account of the mismatching of coefficient of thermal expansion between sealant and printed circuit board, excessive strain are generated in the welding spot between the chip and printed circiut board. With the development of sealing materials, this issue is not very obvious. Therefore, COB tech is more attractive in more fields.

4. With Mature Semiconductor Tech:

In the aspect of semiconductor tech, it is also developd toward COB tech. CMOS component with low power dissipcation is more suitable for COB tech with limited power. Simultaneously, with the IC chip developed toward the trend of consumption and semi-consumption, COB tech is more important.

5. Feasible to Realize the Automation:

Many processes included in the COB tech can realize automatic production. After that, many manufacturers will be more interested in COB tech.


Generally speaking, the advantage of COB tech is attractive to many indutstries. Thereinto, in optical communication industry, COB brings some coneveniences for manufacturers of optical components, such as in form factor, density, etc. However, there are two sides for everything, and COB tech is also without the exception. It also causes problems, such as increasing the complexity of MPD monitoring of optics, etc. Whether the problems/challenges brought by COB tech will be overcome with the future advancement of tech, it remains to be seen.

About Gigalight:

Gigalight is a design innovator in global optical interconnect field. A series of optical interconnect products include: optical transceivers, passive optical components, active optical cables, GIGAC MTP/MPO cabling, cloud programmers & checkers, etc. Three applications are mainly covered: Data Center & Cloud Computing, MAN & Broadcast Video, and Mobile Network & 5G Optical Transmission. Gigalight takes advantage of its exclusive design to provide clients with one-stop optical network devices and cost-effective products.

publié le jeudi 12 avril à 05:53, aucun commentaire.

An Overview of Long-Distance Optical Transceiver: Definition, Types and Application Cautions

With the development of network tech, long-distance optical transceiver module is in great favour of users who need long-reach data transmission in the optical communication industry. Maybe many people are using the optical module, but having little knowledge of it, such as its definition, its types and its application cautions, etc. Today, Gigalight will have an introduction to it in this article.


The Definition of Long-Distance Optical Transceiver

Transmission distance is regarded as one of key factor of optical module. Optical transceiver is divided into short distance optics, middle distance optics and long distance optics. The transmission distance of long-distance optical transceiver is over 30kms, but it cannot reach the maximum distance in the many situations at the process of its actual application. It is due to that the dispersion appears when optical signal transmitting in the optic fiber. To solve this problem, long-distance optical transceiver takes DFB laser only with one main wavelength as the light source. After that, the dispersion can be avoided.


Types of Long-Distance Optical Transceiver

Among these optical transceivers such as SFP optics, SFP+ optics, XFP optics, 40G QSFP+ optics and 100G QSFP28 optical transceiver, there exist some long-distance optical transceiver modules. Thereinto, long-distance SFP+ optical transceiver adopts EML laser components and optical photodetector components, which reduces the power consumption and raises the accuracy via improvements in many aspects. 40G long-distance optical module adopts driver and modulation unit in the transmitting link, the transmission distance is far more than that of existing standard 40G pluggable optical module.

Applications of Long-Distance Optical Transceiver
1. For the interface of switcher
2. For the interface of server
3. For the interface of network card
4. In the security monitoring filed
5. In the telecom field, including data control center and computer room, etc.
6. Ethernet, Fiber Channel(FC), Synchronous Digital Hierachy(SDH), etc.

Cautions for the Utilization of Long Distance Optics

Long-distance optical transceiver has higher requirements for the range of receiving optical power. If the optical power exceeds the range of receiving sensitivity, the failure of optical transceiver module will happen. The use tips and cautions are as follows:

1. After the installation of long-distance optical module into the device, patch cord can not be connected at once. Using the instruction” display transceiver diagnosis interface” to read the transmitting and receiving optical power of optical transceiver module, checking whether the optical power is in the normal range.

2. If the condition is allowable, optical power meter can be used to test the optics. After the transmitting and receiving optical power is at the normal range, the optic fiber can be connected into long distance optical transceiver.

3. In any case, the optic fiber module can not be used to test the long-distance optical module. If it is necessary, it must be connected with the optical attenuator to make the receiving optical power within the normal receiving range.After that, the loopback test can be operated.

4. Using the long-distance optical module, the receiving optical power must keep some margins. Besides,the actual receiving optical power is reserved at over 3dB compared with the receiving sensitivity. If it can not be achieved, the attenuator needs to be used.

5. Long distance optical module can be used completey without attenuationin in 10km transmission application. Generally speaking, optical module over 40km will need to be added attunation. It can not be directly connected, or the ROSA is easily burnt.


Above is the introduction to the defintion of long-distance optical module, types of long-distance optical module, and application cautions of long-distance optical module. Generally speaking, long-distance optical module satisfy most users' requirements for transmission distance to a large degree.It is beleived that long-distance optical module can further meet market demands on performance, power consumption, cost and so on, with the network techs constantly improved. More details are at Gigalight.

About Gigalight:

Gigalight is a design innovator in global optical interconnect field. A series of optical interconnect products include: optical transceivers, passive optical components, active optical cables, GIGAC MTP/MPO cabling, cloud programmers & checkers, etc. Three applications are mainly covered: Data Center & Cloud Computing, MAN & Broadcast Video, and Mobile Network & 5G Optical Transmission. Gigalight takes advantage of its exclusive design to provide clients with one-stop optical network devices and cost-effective products.

publié le mardi 10 avril à 10:01, aucun commentaire.

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