An Introduction of 4 Types of 100G QSFP28 Optical Transceivers

The continual rapid development of Internet and people’s desire for more high-speed optical networks promoted the development of the whole optical communication industry. Meanwhile, they strongly promoted the independent R&D and innovation breakthrough of many core technologies including optoelectronic devices technology. 100G optical transceivers are products of the big data era. According to authorities, by 2018, there will be 38% of service providers deploying 100G networks in the whole world, which means the 100G era has arrived.

Therefore, 100G optical transceivers are quite important in the optical networks, in which 100G QSFP28 optical transceivers are regarded as one of the most popular 100G optical transceivers in the current market. In the post, we will introduce you 4 types of 100G QSFP28 optical transceivers that may be helpful for your needs.

1. 100G QSFP28 CWDM4 2KM Optical Transceiver

100G QSFP28 CWDM4 2KM optical transceiver is a 100Gb/s transceiver module which is designed for optical communication applications compliant with the QSFP MSA,CWDM4 MSA and portions of IEEE P802.3bm standard. The optical transceiver module converts 4 input channels of 25Gb/s electrical data to 4 channels of CWDM optical signals and then multiplexes them into a single channel for 100Gb/s optical transmission. On the contrary, the module de-multiplexes a 100Gb/s optical input into 4 channels of CWDM optical signals and then converts them to 4 output channels of electrical data on the receiver side. The product provides superior performance for 100G Ethernet applications up to 2km links.

2. 100G QSFP28 PSM4 2KM Optical Transceiver

100G QSFP28 PSM4 2KM optical transceiver is a four-channel, pluggable, parallel, fiber-optic QSFP28 PSM4 optical transceiver module for 100/40 Gigabit Ethernet and Infiniband DDR/EDR Applications. This optical transceiver integrates four data lanes in each direction with 104 Gbps bandwidth. Each lane can operate at 26Gbps up to 2km by using G.652 SMF. The optical transceiver module is designed to operate over single mode fiber system using a nominal wavelength of 1310nm. The electrical interface uses a 38PIN Edge type connector. The optical interface uses a single mode 12 fiber MTP (MPO) connector. The outstanding circuit and optical technology by Gigalight provide reliable long life, high performance, and consistent service.

3. 100G QSFP28 LR4 10KM Optical Transceiver

The 100G QSFP28 LR4 optical transceiver module is a 100Gb/s transceiver module designed for optical communication applications compliant to 100GBASE-LR4 of the IEEE P802.3ba standard.
The module converts 4 input channels of 25Gb/s electrical data to 4 channels of LAN WDM optical signals and then multiplexes them into a single channel for 100Gb/s optical transmission. Its 100Gb/s high sensitivity PIN receivers provide superior performance for 100Gigabit Ethernet and OUT4 applications up to 10km links and compliant to optical interface with IEEE802.3ba 88 100GBASE-LR4 requirements. The product design and form factor, light/electrical connections and digital diagnostic interfaces are all based on QSFP+MSA protocol.

4. 100G QSFP28 SR4 Optical Transceiver

The 100G QSFP28 SR4 optical transceiver is a four-channel, pluggable, parallel, fiber-optic QSFP+ SR4 optical transceiver module for 100/40 Gigabit Ethernet, Infiniband DDR/EDR and 32GFC applications. This transceiver is a high performance module for short-range multi-lane data communication and interconnects applications. It integrates 4 data lanes in each direction with 112.2 Gbps bandwidth. Each lane can operate at 8.055Gbps up to 70M using OM3 fiber or 100M using OM4 fiber. The module is designed to operate over multimode fiber system using a nominal wavelength of 850nm. The electrical interface uses a 38 contact edge type connector. The optical interface uses an 12 fiber MTP (MPO) connector.

In above, 100G QSFP28 optical transceiver modules have huge market prospect that are better suited for high-density cabling and widely favored by most data centers. And the 4 types of 100G QSFP28 optical transceiver modules are all launched by Gigalight. If you want to get more information, please visit Gigalight official website.


SFP, SFP + and XFP: What Are the Differences

In current optical communication market, there are various kinds of optical transceivers which come in various form factors at speeds from 100Mbps to 100Gbps and are fully compliant with the MSA and IEEE 802.3 standards. Some of the more popular form factors are SFP, SFP +, XFP, GBIC, QSFP, QSFP28 and QSFP-DD. In this post, we will mainly discuss SFP, SFP + and XFP optical transceivers, the main differences among them will be covered in the following parts.

Definition of SFP:

When we discuss what SFP is, SFP stands for Small Form-Factor Pluggable, a compact, hot-pluggable transceiver that can be used in the ports of telecommunications and data communications equipment. SFP modules are designed to support SONET, Gigabit Ethernet, Fiber Channel and other optical communication standards. Due to its small size and improved performance in conjunction with higher speeds, the module has displaced the universally applicable GBIC transceivers and is therefore sometimes referred to as a mini-GBIC.

As an interchangeable fiber connector that can adapt to any existing network, SFP makes network maintenance a lot easier. SFP transceiver modules allow a higher port density (number of transceivers per cm along the edge of a motherboard). These modules are not standardized by a state agency, but specified by a multi-source agreement (MSA), which has been adopted by various manufacturers. Some network component manufacturers have provided protection to the SFPs, deliberately avoiding compatibility with generic "SFPs" by checking firmware or other areas of programming, whereby only the modules approved by the manufacturer can be used. However, some manufacturers have introduced SFPs with empty programmable EEPROMs that can be reprogrammed to match each supplier ID.

Modern SFP transceiver modules also come with standard Digital Diagnostic Monitoring (DDM) functions, which is also known as Digital Optical Monitoring (DOM). This gives end users the ability to monitor in real time SFP parameters such as optical output, optical input power, temperature, laser current, supply voltage, etc. This functionality can be used to monitor routers, switches, and other optical devices, which can be reprogrammed to match any supplier ID.

Definition of SFP +:

SFP + stands for Small Form-Factor Pluggable Plus. SFP + transceivers are an enhanced version of the SFP that can support data rates up to 16Gbps. The SFP + specification were first published on May 9, 2006 and the first version 4.2 was released on July 6, 2009. As one of the most popular industry standards in optical communication industry, SFP + transceivers are supported by many network component providers. SFP + offers standard 8 Gbps Fiber Channel, 10 Gigabit Ethernet and the Optical Transport Network Standard OTU2.

SFP + transceiver modules have the same dimensions as the SFP. The big difference between the SFP and SFP + modules is the coding method. These modules have more circuitry on the host board than the internal module. SFP + modules can also be used in older devices with XENPAK or X2 ports through the use of an active electronic adapter. SFP + modules come in two types linear and limited. Linear SFP + modules are best for 10GBase-LRM, otherwise limited modules are preferred. These contain a signal amplifier to redesign the degraded (received) signal, whereas linear modules do not.

Definition of XFP:

XFP stands for 10 Gigabit Small Form Factor Pluggable, a hot-swappable and protocol independent module. It enables a fast transmission of data in the computer network. XFP was devised by the XFP Multi-source Agreement Group and first emerged in the year 2002 along with XFI, one of its electrical components.

XFP transceiver modules are protocol-independent and fully compliant to various standards, including: 10G Ethernet, 10G Fibre Channel, SONET OC-192, SDH STM-64 and OTN G.709. It supports bit rate from 9.95G through 11.3G, along with its interface to other electrical components which is called XFI. The 10-Gigabit XFP transceiver module is a hot-swappable I/O device that plugs into 10-Gigabit ports.XFP transceiver modules connects the electrical circuitry of the system with the optical network.

SFP package --- hot-plug small- package module, the highest rate is up to 4G , usually LC interface connect.
SFP + package --- standard package, the working speed can be 10G, the application of 10G Ethernet.
XFP --- standardized package of serial 10G optical transceiver modules.

The Difference between SFP and SFP +:

1. The look and the size of the SFP and SFP + are the same;
2. The highest rate of SFP is up to 4G is the rate of SFP + 10G;
3. The protocol specification of the SFP: SFP: IEEE802.3, SFF-8472;
4. SFP + supports DDM .

The Difference between SFP + and XFP:

1. SFP + and XFP both are 10G optical module , and can be connected with other types of 10G modules;
2. The look and the size of the SFP + is less than XFP;
3. Because of the smaller size, SFP + moves the signal modulation function, serial / deserialization program, MAC, clock and data recovery ( CDR ) and electronic distribution compensation ( EDC ) function to the motherboard card from modules;
4. Compliance agreement of XFP: MSA XFP agreement;
5. Compliance Agreement of SFP +: IEEE 802.3ae, SFF-8431, SFF-8432;
6. SFP + is a mainstream design;
7. The Protocol Specification of SFP +: IEEE 802.3ae, SFF-8431, and SFF-8432.

10G optical module underwent the development of 300Pin, XENPAK, X2, XFP, which finally realize that the transmission of 10G signal with the same size as SFP, this is SFP +. SFP + met the requirements of the high-density optical module, gradually replacing XFP and become the mainstream of the 10G market. People around the world learn the difference between SFP, SFP + and XFP, and avoid unnecessary hassles to the customer, so we provide some information for them.


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Gigalight 100G Single Optical Transceiver Has Been Admitted By Domestic DPI Manufacturers

Nowadays, DPI industry is developed rapidly. In the development waves, the demand of Network security is constantly raised, and the personalized recognition for the users’ service is also gradually strengthened. Therefore, how to meet the market demands of data center, manufacturers and Internet enterprises,has recently become the crucial topic of Gigalight.
However, at the process of the implement from the gradual upgrading of 10G POS/WAN-40G/100G to the enrichment of product line, the improvement of delivery capability, the making of long-term goals, Gigalight has made breakthrough achievements in these aspects, seen from the truth that Gigalight continuously has won the bids  of the leading DPI device manufacturers in this field and has gained their supports. Now, the below is the detailed introduction about these measures:

Measure 1: Providing Rich Product Lines
For an enterprise, products are the core. Rich product lines is able to meet the needs of manufacturers in many aspects and to reduce the combination costs. Therefore, Gigalight spares no effort to build one rich product line, 100G QSFP28 LR4/CFP LR4/CFP2 LR4 series single optical module product line, satisfying the needs of clients about the high bandwidth. Meanwhile, by the tech innovation , the adoption of self-developed ROSA components lead to the low-cost products, bringing DPI manufacturers practical benefits. In addition, the 100G CFP4 LR4 also can be customized and achieve the multiple options of products.

Measure 2: Improving the Delivery Capability
For the professional optical transceiver manufacturers, they are not only with the ability to offer clients high-quality and high-performance optical transceiver solutions, but also with the delivery capability to share the delivery pressure of manufacturers.

Recently, Gigalight DPI series 100G single optical transceiver continuously won the bids of leading device manufacturers. Faced with the short delivery time, Gigalight gave the manufacturers a satisfying result by virtue of their strong delivery ability and high quality products, by which they are highly admitted by domestic DPI manufacturers and DPI market is also injected a new fresh air. 

Measure 3: Making The Long-Term Goals
For a company, a long-term  goal is the motivation of producing and the soul of offering higher-quality service for clients. Gigalight combines the market needs and its own tech strengths to achieve the goal, in the later two years’ DPI market, making the 100G product’s cost at $100 via scale and new tech to get the DPI devices applied widely, to continuously provide manufacturers with high-quality and low-cost optical module products and to offer more low-cost products to DPI manufacturers for options.

Above all is the Gigalight news about 100G single optical transceiver. If you want to know more, welcome to contact us at any time.

Note: Gigalight is the head office of Infiberone.


Consideration on the Applications of 100GE QSFP28 in the Large-Scare Data Center

1.The Changes On the Structure of Data Supercomputing Center Lead to the 100GE ports’ rapid increasing in Number, Showing the importance of Structure 
With the rapid increasing of IP flux , the accelerated infiltration of cloud computing and virtualization, and the fast burstout of IDC inner flux, large-scale data center is developed toward new and flat leaf- spine network structure continuously. Traditional three-layers network structure of data center will be replaced by new and flat leaf- spine network structure. 

Meanwhile, With the rapid increasing in quantity of interconnection ports between leaf converters and spine converters, the demands on high-end 40GE/100GE optical transceiver also rise rapidly with it. It’s predicted by the Third-Part Institution that 40GE/100GE high-speed optical modules’ quantity ,needed by leaf- spine network structure, is 15-30 times the quantity of Traditional three-layers network structure for the large-scale data center. In addition, high-speed optical modules will be upgraded from10G/40G optical module to 100G/200G, especially is 100G optical module, demands for it will be raised in a large scale. 

2.Exploration On the Background of Rapid Increasing for 100G Optical Module, Showing the Importance of Wiring 
It’s predicted by the Third-Part Institution, Ovum, that the deployed quantity of 100G single-mode optical module will be close to or exceed the one of 100G multimode optical module, With the rapid increasing in quantity of interconnection ports between leaf converters and spine converters, and the distance among converters extended . Shown as the above pic, in the data center with 500,000 ft2, the quantity of TOR/Leaf/Spine converters and 100G single-mode/multimode optical modules has been listed clearly. We need to make some theoretical exploration:  

A. Difficulties in wiring space due to the density of scales and devices. For these difficulties, data center may prefer to choose the 100G CWDM4 optical module in the long-distance interconnection, because it saves the fiber wiring space and the reduces fiber wiring difficulties superficially at least. But such kind of savings lead to self-limitation on account that wiring structure has no good designs from the beginning. Therefore, deep consideration is necessary before deploying it.

B. Based on the comprehension for scale and different techs, PSM4 and CWDM4 optical module will be deployed. They should be used on the basis of comprehensive assessment for their stability, power dissipation and working life. Technically evaluating, CWDM4 optical module is more complicated than PSM4 optical module. 

But whether the complex standards constituted by industry association are reasonable is worth reflecting. The performance of CWDM4 optical module is becoming higher and higher, and the large-scale usage for it will exist no dangers under the guarantee of 65 or double-85 test’s reliability. But we haven’t seen the improvements on techs from PSM4 to CWDM4, and it seems that everything is like factitious tech barriers and trends. Our viewpoints on CWDM4 are that it’s just an extension for PSM4 optical module, not another application tech superior to the former. The large-scale applications for the PSM4 and CWDM4 may be a miracle in the data center.

C. The wiring structure of data center has a great influence in the cost of large-scale data center. What we should focus on is wiring, not devices, which we consider as the deviation of industry’s focus. When we are keen on studying converters and servers with high speed and high performance, we must have wiring techs suitable for them, which is just like that inspection for subgrade , the assurance for the structure and plot ratio of the building, should be done before building a house. If everything about it weren’t confirmed, the built house may be with hidden safety dangers or not good in Fengshui theory. 

Similarly, if we don’t confirm the basic wiring, the PCB layout of electrical products, in advance, the performance of them will be at a mess. If a data center is built hastily, no differences with previously-built computer room, and it will truly enter into the deserted stage. 

D. We must have a long-term consideration on data center, in which long term must be a relative concept. How long it should be must integrate the present progress and demands on dealing with the datas in the data center. If the sources of rapid increasing needs aren’t confirmed, frankly speaking, the distribution for a new data center will be finally proved to be impractical and wasteful when it adopts immatural or the most advanced products. 

In addition, the future level about interconnection tech of data center still isn’t confirmed, even though certain paths made by industry association aren’t necessarily correct in the direction. Now, industry association is used to making many decisions hastily, which usually leads to efforts in the incorrect direction. 

3.Advantages of 100G PSM4/100G CWDM4/100G LR4 Optical Module And The Importance of Choices.
A comparison about the integrated parameters of 100G optical module in wavelength, optical connector, fiber types, working distance, the interior of optical module with/without MUX/DEMUX, system terminal with/without needs of FEC function, the power dissipation of optical module and so on, in this table, used for customers’ reference:    

100GBASE-SR4(100 m) and 100GBASE-LR4(10 km) are defined by IEEE. Due to the needs from data center customers, 100G CWDM4 and 100G PSM4 are also defined by MSA, making up for the gap in needs between 100meters and 10KM. Compared with 100GBASE-LR4, 100G CWDM4 and 100G PSM4 have the lower cost advantages and their application distances cover 2 KM. And 100G PSM4 adopts parallel single-mode tech and MPO APC 8°connector with eight fibers, with the lowest cost in the 100G single-mode transmission tech. 

Besides, in the market, there is 100G PSM4 made on the basis of silicon photonics tech or traditional 4x mini TOSA packaging tech. Similarly, they have the advantages on the low cost. Sometimes two-fibers CWDM4 are considered to be more economical and practical than multi-fibers PSM4. However, the results is contrary:
1. PSM4 increases the complexity of wiring density, and CWDM4 results in the complexity of devices’ performance. 

2. PSM4 is still available to extend in space, and CWDM4 has gotten into the endless loop.

3. PSM4 is with higher stability and reliability in the wavelength, and in the present whole chain, CWDM4 still exists problems in reliability and have no way to pass the double-85 test. 

4. PSM4 is with lower power dissipation, and CWDM4 needs interior temperature or control from the external environment to reach the ideal power dissipation on account that the narrow space of module causes the heat dissipation problem.

5. PSM4 is easier to manage because of its clear link path, and CWDM4’s link path is not clear. 

Whatever optic product manufacturers of data center want, the producers of optical module can provide it for them. And it’s proved that there exists direction problems in the previous comparison of advancement and superiority between optical module/ devices and data center. All techs about optical module will tend to be same in the performance and be more stable one year later. We should concentrate on the improvement of wiring techs and more economical and practical items. 

With the progress in the optical interconnection tech, data center will tends to be at the state of instant evolution and flourish, which means continuous devotion and evolution and is with no ultimate products. The combination process from 1G to 100G and then from 400G to 1T, will be the final and vital formation of data center, based on the combination of different applications.  

4.Introduction about 100GE QSFP28 Data Center Application Cases
1. In June, 2016, Azure data center started to adopt Intel 100G QSFP28 PSM4 silicon photonics optical module volumely. Azure cloud service have been used in the 140 countries, and over 90% of Fortune 500 enterprises have applied Microsoft Azure, which will be immediately expanded to 34 areas on the basis of existing 28 areas in the world where more than 100 data centers were invested to build. The number will exceed the sum of AWS, Google and AliCloud. 

2. In February, 2017, Facebook specially released OCP CWDM4 standards to deploy 100G QSFP28 CWDM4 scalely. For the volume production and low cost, Facebook has loosened part of standards, such as working temperature, optical emission power, receiving sensitivity and optical link path index. At present, Facebook has purchased 100G QSFP28 CWDM4 optical module.

5.Recommendation on the Infiberone 100GE QSFP28 Products 
By their own strength, Infiberone developed 100G QSFP28 CWDM4 optical module with cost benefit by themself. This optical module adopts self-packaged optical engine, and some micro components are assembled inside, such as DFB laser(1271nm,1291nm,1311nm and 1331nm)of 4-channels 25Gbps uncooled CWDM, 4-channels optical detector, CDRs, micro AWG chip and so on. Under the total air temperature(0~70℃), its typical power consumption is lower than 2.6W, and its optic eye diagram margin is higher than 20%. 

In addition, its sensitivity is(pre-FEC 1E-5BER OMA)<-10.5dBm. Its error rate guarantees BER is higher than 1x10-12 under the application of post FEC. Meanwhile, it uses Duplex LC optical interface and meets the needs of 2km transmission distance. Infiberone will get about to producing it volumely in the forth quarter of 2017.
Infiberone QSFP28 PSM4 optical module shows a good performance under the  -5°C/25°C /55°C. The uniformity and consistency of four channels are accorded with design requirements and its optical eye diagram margin is higher than 15% under the -5°C/25°C /55°C . and sensitivity is higher than-9.5dbm(1E-5) constrained by agreements, meeting the needs of data center applications in the fiber transmission distance, no less than 2km. the success on the development of Infiberone 100G PSM4 optical module, means that it officially has its own essential tech and skill in the single-mode optical engine. In addition, it will start to produce this product volumely in the third quarter of 2017.

Infiberone set about to developing data center single-mode product line and its packaging techs in 2015 and officially sold 100G QSFP28 LR4 (DML)products in the end of 2016. 100G QSFP28 LR4 optical module’s power consumption is lower than 3.5W, and uses self-packaged optical engine, ROSA. In addition, its transmission distance can reach 10km when it’s connected with single-mode fiber. It conforms to IEEE802.3ba 100GBASE-LR4 and QSFP+ MSA standards. Its typical power consumption is lower than 2.6w under the total air temperature (0~70℃) and its optical eye diagram margin is higher than 20%. In the first quarter of 2017, Infiberone gets down to producing this product volumely.

For Infiberone second-generation 100G QSFP28 SR4 with lower power consumption, under the CDR working condition, its typical power consumption under the indoor temperature and 70℃ respectively is 2W and 2.2W, reaching the power consumption level ,MAX POWER 2.5W in the SFF-8436 V4.8 MSA Power level 3. 

Meanwhile, it meets the standards, such as IEEE 802.3bm 100GBASE SR4, InfiniBand EDR, 32GFC and so on, downward compatible with 10GE, completely suitable for transmission applications on transmission, such as OM3 75meters fiber transmission and OM4 100meters fiber transmission. Under the true test conditions, OM4 fiber with 100meters transmission distance has no any error code according to the stricter error rate test standards. 100G QSFP28 SR4 adopts the lens tech and optical engine tech self-developed by Infiberone, supporting the digital diagnostic function and integrating data channel of 25Gbps with 4 channels and receiving-and-sending function. 

In addition, 100G QSFP28 SR4 optical module is with higher performance in optical eye diagram, sensitivity for receiving and electric eye chattering. At present, this product has been produced volumely. The VCSEL optical module tech and production tech platform are self-developed by Infiberone, and their related cost is close to critical value by optimization whether it’s in coaxial packaging or COB tech. Advantages on the scale of delivering has been strongly supported by suppliers. 

Infiberone is the advocator of 100G QSFP28 optical module products and tech marketing in date center ,and maintains a keen insight into technology and cost . In 2016, Infiberone started to arrange the layout about all series of 100G QSFP28 optical module and solutions. In March,2017, 100G PSM4 optical module was officially pushed out. And in July,2017, the sample of 100G QSFP28 CWDM4 optical module was developed, which used AAWG chip and unique COB tech platform, with good stability in temperature, suitable for the capacity expansion of data center with parallel structure or optical interconnection structure of wavelength division multiplexing style data center. 

The successful development of 100G QSFP28 CWDM4 and 100G QSFP28 PSM4 optical module has built a new competitive strength for Infiberone data center market strategy, and will also be one of the most powerful suppliers of 100G optical module in the domestic data center.

Note: Infiberone is a sub-brand of Gigalight, we focus on high-end optical network devices, mainly supplying industrial-grade optical transceivers and professional optical interconnection components for data centers. With more than 10 years' experience in optics industry, we now have professional R&D team(more than 100 engineers) and stable supply ability. 


Infiberone Pushed Out Low-Cost OTU4 100G Optical Transceiver to Remarch Toward DPI Market

News on August 31st,2017. It’s reported that Infiberone has pushed out new-style OTU4 100G optical transceiver, including 100G CFP2 LR4 10KM and 100G OTU4 QSFP28 LR4, before the coming of CIOE, which will be a very attractive choice for DPI clients.
     100G CFP2 LR4 10KM

      100G OTU4 QSFP28 LR4

Infiberone new-style OTU4 100G optical transceiver is available for four-channels full duplex communication, in which the transmission speed rate of each channel is 28Gbps, uses self-developed 100G ROSA, is accorded to CFP2 /QSFP28 MSA hardware standards, IEEE 802.3ba 100GBASE LR4 and OTU4 4I1-9D1F, and is with MDIO digital diagnostics and control functions. In addition, DML optical master with assembled LD chip and DML PIN acceptor with high flexibility are adopted, in which the power consumption of CFP2-LR4 is lower than 6W and the one of QSFP28 LR4 is lower than 3.5W, both of which have advantages of low power consumption, and available to transmit data of 100GbE and OTU4 in 10km single-mode optic fiber.

                             Transmitting Optic Eye Diagram

Compared with EML 100G optical module adopting EML optical master,DML optical receiver is mainly responsible to deal with problems about the low cost and low power consumption in the DPI market. The requirements for DML optical master are raised due to the rising of speed rate. Therefore, the transmission of OTU4 will be a very big challenge. However, Infiberone succeeds in breaking through the hard tech problems and solving the usage problems of DML at the speed of 28Gbps by combining the market trend and its own developed strength and via innovative tech development.
With the rapid development of Internet, cloud computing, data center and so on. Infiberone will push out more products with high-quality and new tech to meet the clients’ multiple needs. Let’s expect it.

Note: Infiberone is a sub-brand of Gigalight, we focus on high-end optical network devices, mainly supplying industrial-grade optical transceivers and professional optical interconnection components for data centers. With more than 10 years' experience in optics industry, we now have professional R&D team(more than 100 engineers) and stable supply ability. 


A Big Sale for Optic Transceiver

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