Category: Fiber Transceivers

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

The Solution to SFP Transceiver Module Connections

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

Recently I met a trouble that when I want interconnect WS c2960 24 TC L + 2 SFP with 1000base LH GLC LH SMD or GLC LH SM to WS C3750G 12S + 12 SFP ports, and I do not know which model of GLC LH SMD or GLC LH SM want to select, and I am going to use single mode fiber optic cable 1310m 9/125. If I need single mode SMD (2 fiber counts) or single fiber. I just want to find out WS C3750G12S + 12 SFP ports that 12 SFP ports are SM or SMD use LC connector. The solution to SFP transceiver module connections will be provided in this article.
In fact, I received several answers, someone says, the price between the 2 usually the same but GLC LH SMD SFP transceiver module supports additional option of DOM (digital optical monitoring). So he uses GLC LH SMD, as for which fiber cable, just use the single fiber cable, but I think so I use SMD how can I use single fiber cable, this is one way direction and i think i should use single mode duplex (2 fiber count). And can connect single mode duplex (2 fiber count) fiber cable to WS C3750G 12S.
Then someone from fiber-mart.com answered me that both the GLC LH SM and GLC LH SMD SFP transceiver module supports the IEEE 802.3 1000Base LX/LH standard and be good for compatible with each other. The difference between the two is the case that the GLC-LH-SMD transceiver has additional support for Digital Optical Monitoring capability. As for the second question, 1000base fx sfp, 1000base sx sfp, 1000base lx lh sfp, 1000base zx sfp, 1000base bx10 sfp, DWDM and CWDM SFP transceiver module: LC fiber connectors (single-mode or multimode fiber); 10GBASE-SR, LR, LRM, CX1 (v02 or higher) SFP+ Transceivers: LC fiber connectors (single-mode or multimode fiber).
Then if you have such similar problems, hope it can help you, and there I have a small tips for us, if you want to know where to get sfp transceiver and reach these effects, fiber-mart.com is a good place to get them, I found it do a professional site, and the price also reasonable, It is worth mentioning that fiber-mart.com is doing a big sales.

What is Defined by the SFP MSA or SFP+ MSA?

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

The main elements defined in the SFP/SFP+ MSA is listed as follows:
Mechanical Interface
Mechanical dimensions of the device (H: 8.5mm, W: 13.4mm, D: 56.5mm)
Transceiver edge connector to host PCB-mounted electrical connector mating
Host board mechanical layout (location/size of solder pads, etc.)
Insertion, Extraction and Retention forces
Labeling
Bezel design considerations for host systems
Electrical connector mechanical aspects
Cage assembly dimensions (hollow cage mounted in host system)
Electrical Interface
Pin definitions
Timing requirements and Status I/O
Module definition interface and data field description
Besides, the Digital Diagnostics Monitoring (DDM) feature common in many modern SFP/SFP+ transceivers as defined in SFF-8472 MSA specification. “D” in GLC-LH-SMD represents the DDM function according to the industry standard MSA SFF-8472. The SFF-8472 added DDM interface and outlined that DDM interface is an extension of the serial ID interface defined in GBIC specification, as well as the SFP MSA.
The Importance of SFP/SFP+ MSA
MSAs, like most standards efforts, are important primarily because they can give customers a choice in suppliers from which they purchase products. Freedom of choice is the foundation of the efficient operation of markets. Customers in the marketplace should have the benefit of multiple independent suppliers, each competing to gain a share of the market. This behavior forces suppliers to be as efficient and creative as possible, driving down costs and offering customers the widest array of options.
It is true that some system vendors have attempted to subvert the standardizing value of the SFP MSA or SFP+ MSA. The most common scheme is to write a unique code into some of the undefined memory in the EEPROM of each SFP/SFP+. When the transceiver is inserted into the host switch, its EEPROM is read, and, if the code is “incorrect” the module is rejected as “incompatible”. But Fiberstore can do it. At present, fiber-mart.COM offers a comprehensive brand’s compatible solution of the transceivers which can meet the demands for Cisco, HP, Juniper, NETGEAR, Brocade etc.

PON Splitters—An Important Role in FTTH Networks

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

Created by the Full Service Access Network (fiber-mart.com) working group, the Passive Optical Network (PON) is a group of technologies that put Fiber to the Home (FTTH) into reality. It consists of a central office node optical line terminal (OLT) at the service provider’s office and a number of optical network units (ONUs) near the end users. A single PON network interface can be shared among many subscribers through the use of PON splitter which contains no electronics and use no power.
For the FTTH network designer, one of the key parameters is the achievable span between the central office and the subscribers (the maximum optical budget allowed in the system). As a part of the optical budget, the PON splitter is the most demanding component in terms of losses. Thus every FTTH system vendor is advised to use a PON splitter with the lowest level of insertion loss and maximum uniformity.
PON Splitter in FTTH Networks
Sharing one expensive laser with up to 32 homes, a PON splitter takes one input and splits it to broadcast to many users, cutting the cost of the links substantially. Furthermore, since PON splitters are bi-directional devices, signals can be sent downstream from the central office, broadcast to all users, and signals from the users can also be sent upstream and combined into one fiber to communicate with the central office.
The PON splitter can be one unit in a single location or several splitters cascaded. To reduce the amount of fiber in a network, cascaded splitters can be used by placing splitters nearer the user. This is usually done when houses being served are clustered in smaller groups.
Most PON splitters are 1×32 or 2×32 or some smaller number of splits in a binary sequence (2, 4, 8, 16, 32, etc.). Adding considerable loss to an FTTH link, Splitters limit the distance of an FTTH link compared to typical point-to-point telco link. To solve this problem, every house needs to be connected to the local central office with single mode fiber through a fiber splitter.
Two Kinds of PON Splitters
The fused biconical tapered (FBT) coupler and the planar lightwave circuit (PLC) splitter are two main kinds of technical approaches to solving the signal splitting issues in an FTTH system. FBT couplers, also known as FBT WDM splitters, are traditional fused splitters which feature competitive price. PLC splitters are based on the PLC technology, which has compact sizes and suits for density applications.
PON splitter in the PON system allows a signal transmitted over a single optical fiber from the telephone exchange office to be shared with multiple users, hence reducing the cost of every subscriber. Nowadays, the PON system has expanded extensively as an optical network in the construction of FTTH. Different manufacturers produce a large amount of PON splitters which have different functions. fiber-mart.com, which is one of the optical network products suppliers, provides both PLC splitters and FBT couplers for Ethernet passive optical network (EPON)/Gigabit passive optical network (GPON) system.

Differences Between FBT Splitter and PLC Splitter

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

Nowadays, with the further popularization of the optical fiber communication, fiber optic splitter plays an increasing significant role in many of today’s optical network topologies. Although there are variations of splitter types, the two most commonly deployed splitters are FBT (Fused Biconical Taper) splitter and PLC (Planar Lightwave Circuit) splitter. So, when you deploy your network, what kind of splitter you should choose may be a problem for you. And in order to solve this problem, this paper will give you a detailed introduction of differences between FBT splitter and PLC splitter.
Definition of FBT Splitter and PLC Splitter
Before you get to know the features of them, first you should know what them are. Next, each splitter will be introduced.
FBT Splitter – FBT is a traditional technology that two fibers are typically twisted and fused together while the assembly is being elongated and tapered. The fused fibers are protected by a glass substrate and then protected by a stainless steel tube, typically 3mm diameter by 54mm long. FBT splitters are widely accepted and used in passive optical networks, especially for instances where the split configuration is not more than 1×4. The slight drawback of this technology is when larger split configurations such as 1×16, 1×32 and 1×64 are needed.
PLC splitter – A PLC splitter is a micro-optical component based on planar lightwave circuit technology and provides a low cost light distribution solution with small form factor and high reliability. It is manufactured using silica glass waveguide circuits that are aligned with a V-groove fiber array chip that uses ribbon fiber. Once everything is aligned and bonded, it is then packaged inside a miniature housing. PLC Splitter has high quality performance, such as low insertion loss, low PDL (Polarization Dependent Loss), high return loss and excellent uniformity over a wide wavelength range from 1260 nm to 1620 nm and have an operating temperature -40°C to +85°C.
Feature Comparison of FBT Splitter and PLC Splitter
In the past few years, splitter technology has made a huge step forward, especially the PLC splitter technology. This situation resulted in that PLC splitter has become a higher reliable type of device compared to the traditional FBT splitter. Although being similar in size and appearance, the internally technologies behind these types vary, thus giving service providers a possibility to choose a more appropriate solution.
Operating Wavelength – As is mentioned above, PLC splitter can provide a range of operating wavelength from 1260 nm to 1620 nm. But FBT splitters only support three wavelengths (850/1310/1550 nm) which makes these devices unable to operate on other wavelengths.
Operating Temperature – Commonly, FTB splitter is to a high extent temperature sensitive, providing a stable working range of -5 °C to 75 °C. While PLC splitter operates at wider temperature range (-40 °C to 85 °C), allowing its deploying in the areas of extreme climate.
Split Ratio – The split ratio of FBT splitter is 1:8 and it can be higher with higher failure rate. The split ratio of PLC splitter can go up to 64, which is equal to all branches, thus providing a high reliability.
Cost – FBT splitter is made out of materials that are easily available, for example steel, fiber, hot dorm and others. All of these materials are low-price, which determines the low cost of the device itself. PLC splitter manufacturing technology is more complex. It uses semiconductor technology (lithography, etching, developer technology) production, hence it is more difficult to manufacture. Therefore, the price of this device is higher.
Conclusion
In a word, Compared with FBT splitter, the capacity of PLC splitter is better, but costlier than the FBT splitter in the smaller ratios. You can choose it according to your requirements. fiber-mart.com offers both FBT splitter and PLC splitter with good quality and low price. Whether in FTTx systems or in traditional optic network, fiber-mart.com splitter can help you to maximize the functionality of optical network circuits.

How to Choose Between PLC & FBT Fiber Optic Splitters?

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

In FTTx and PON architectures, fiber optic splitter is an important component to share the optic network with multiple users. The basic principle of fiber optic splitter is to split one optic light beam into several parts at a certain ratio. According to different manufacture technologies, fiber optic splitters can be divided into PLC splitter and FBT splitter. You may wonder the differences of the two splitter types when making a choice between them. This article aims at helping you to understand their distinctions and make better decisions.
Basics of PLC & FBT Splitters
PLC refers to planar lightwave circuit. As a micro-optical device, PLC splitter uses an optical chip to split the input signal into various outputs. At the edge of the chip, there is a light circuit in ribbon form mounted on a carrier and fibers. PLC splitter typically adopts silica glass as the material of lightwave circuit and accepts different types of polished finishes. The substrate, waveguide and lid are three basic layers of the PLC splitter. For different applications, PLC splitters can be further categorized into different types including bare PLC splitters, blockless PLC splitters, ABS PLC splitters, LGX box PLC splitters, mini plug-in type PLC splitters, tray type PLC splitters and 1U rack mount PLC splitters.
What Is FBT Splitter?
FBT, or fused biconic taper uses the traditional technology to fuse several fibers together closely. Fibers are aligned by heating for a specific location and length. Fusion process will not stop until the parameters of the fibers reach the required standards. Since fused fibers are very fragile, they are protected by a glass tube made of epoxy and silica powder. Then a stainless steel tube covers the inner glass tube and is sealed by silicon. FBT splitter with ABS box is also widely used for different applications.
Differences Between PLC & FBT Splitters
PLC and FBT splitters may look similar to each other, yet they still have many differences when it comes to actual applications. Here will compare them from several aspects.
Splitting Ratio
Splitting ratio is decided by the inputs and outputs of a splitter. A PLC splitter is available with the splitting ratio of 1:64, which means one light beam can be separated into 64 splits at a time. However, FBT splitter is typically used for networks requiring the splitter configuration of less than 4 splits. When its splitting ratio is larger than 1:8, more errors will occur and cause higher failure rate. Thus, FBT splitter is more restricted to the number of splits in one coupling.
Wavelength Range
PLC splitter has a wider operating wavelength ranging from 1260 nm to 1620 nm, thus it can be applied to most of the applications in FTTx and PON networks. On the contrary, FBT splitter has a limitation only to be used for 850nm, 1310nm and 1550nm wavelengths. This leads to the unavailability of FBT splitter on other wavelengths.
Temperature Dependent Loss
Temperature dependent loss (TDL) of the splitter is affected by the manufacturing process and the sensitivity of device. Once the working temperature of splitter is out of range, insertion loss will increase and influence the performance of splitter. PLC splitter is able to work at the temperature of -40 to 85 Celsius degrees while FBT splitter can only work at -5 to 75 Celsius degrees.
Price
Owing to the complicated manufacturing technology of PLC splitter, its cost is generally higher than the FBT type. If your application is simple and short of funds, FBT splitter is definitely a cost-effective solution.
Conclusion
In this article, some differences between PLC and FBT splitters are introduced to help you choose the most suitable one for your network. Overall, PLC splitter has better performance and less limitations, but FBT splitter is less expensive to save more for the budgets. If you are still uncertain which one to choose, please consult a professional for help.

Fiber Connector And Adapter Panel For Optical Links Together

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

Fiber optic connector is used for the connection of optical fibers or fiber optic cables. The Fiber Optic Connector provide a mechanical connection for the two fiber cables and align both cores precisely.
There have been over 100 connectors developed over the years, but a select few have stood the test of time and beat out their competition. Fiber Optic Connectors according to the different transmission media can be divided into common silicon-based optical fiber single-mode and multimode connectors, as well as other issues such as plastic and as the transmission medium of optical fiber connector; connector structure can be divided into: FC SC, ST, LC, D4, DIN, MU, the MT and so on in various forms, but SC and LC connectors are the most common types of connectors on the market. ST connector is the most popular connector for multimode networks. Different connectors are required for multimode and single-mode fibers.
In addition to connectors that tie two fiber-optic lines together, there are also Adaptor Panels (or fiber adapter plates) that can be used to connect multiple fiber-optic lineself. It enables you to make quick and easy fiber patch panel connections as they can snap into the enclosures easily. In a device such as this, connections can be made between any of the lines plugged into the panel. Though a single adapter panel can usually only hold a dozen or so cables, the panels can also be spliced together, allowing hundreds or thousands of connections to be made.
Specify optical fiber adapter plates for ST-, FC-, SC-, MT-RJ- or LC-type connections. Adapter plates are compatible with all wall and rack mount optical fiber enclosures and available in 6 simplex and duplex, 8 simplex and duplex and 6 quad configurations with fiber counts of up to 24 per adapter plate. They mount easily by means of plunger locks (“pushpins”). ST, FC, SC and LC connec-tor plates can be equipped with 62.5-μm and 50-μm adapters suitable for multimode applications or a sisingle modenly version is available with adapters outfitted with zirconia ceramic sleeves. Our SC and LC 10G multimode laser optimized adapter uses zirconia ceramic sleeves.
Available in 6-, 8-, and 12-port fiber configurations,
Panel options available include ST, SC, LC and others,
High density applications can be reached through Dual and Quad LC applications,
Composite, Metal, or Ceramic sleeve options available,
Blank panels are available for use as dust covers,
Plates are available for mounting Bezel style jacks creating a mixed media environment.
In order to customize wall mount or rack mount fiber optic enclosures, fiber-mart.com offers a wide selection of panels with various Optical Adapter including ST, SC, MTRJ and LC. All modular adapter panels are assembled with industry standard adapters. fiber-mart.com fiber adapter panels/plates can come with various fiber adapters, such as LC/SC/ST/FC/MT-RJ, E-2000 fiber optic adapters, compatible with simplex or duplex and meet TIA/EIA-568-B.3 requirements. Our adapter plates include phosphor bronze or zirconia ceramic split sleeves to fit specific network requirements. LC and SC adapter housing colors follow the TIA/EIA-568-C.3 suggested color identification scheme. Multimedia modular panels allow customization of installation for applications requiring integration of fiber optic and copper cables. Blank fiber adapter panels reserve fiber adapter panel space for future use.