Fujikura ADC-11 AC Adapter for FMM-50S/50R Fusion Splicer i place the order two days ago, now i had received the...
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NEMA L5-30 (Male) to IEC60320 C19 (Female) 12/3 AWG 125V/20A SJT Power Cord i find many stores, but finally buy this power cord...
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Rubber Dust Cap Covers ST Connector Housing and ST Adapters,Yellow Color,100pcs/pack very fast delivery, the quality is good, i like to buy more...
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3M(9.8ft) 40GBASE QSFP+ to LC/SC/ST/FC Connector(8) Breakout Active Optical Cable the cable works good with our switch, will but it again...
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3M(9.8ft) 40GBASE QSFP+ to LC/SC/ST/FC Connector(8) Breakout Active Optical Cable is it possible to make the cable up to 50 meters?
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24 Fibers LC to SC 10G OM3 50/125 Multimode MultiFiber PreTerminated Breakout Trunk Cable Had an issue with my order. someone actually provided...
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A Pair of 10/100/1000M Single Fiber 1310/1550nm 10km External Power Supply Mini Gigabit Media Converter I am very satisfied with your Service. Again, thank you...
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FC UPC to ST UPC Duplex PVC/LSZH/OFNP 9/125 Single Mode Fiber Patch Cable Very good product.
Items arrived timely, well...
5 of 5 Stars!
Fujikura ADC-11 AC Adapter for FMM-50S/50R Fusion Splicer i place the order two days ago, now i had received the...
5 of 5 Stars!
NEMA L5-30 (Male) to IEC60320 C19 (Female) 12/3 AWG 125V/20A SJT Power Cord i find many stores, but finally buy this power cord...
5 of 5 Stars!
Rubber Dust Cap Covers ST Connector Housing and ST Adapters,Yellow Color,100pcs/pack very fast delivery, the quality is good, i like to buy more...
5 of 5 Stars!
3M(9.8ft) 40GBASE QSFP+ to LC/SC/ST/FC Connector(8) Breakout Active Optical Cable the cable works good with our switch, will but it again...
5 of 5 Stars!
3M(9.8ft) 40GBASE QSFP+ to LC/SC/ST/FC Connector(8) Breakout Active Optical Cable is it possible to make the cable up to 50 meters?
4 of 5 Stars!
24 Fibers LC to SC 10G OM3 50/125 Multimode MultiFiber PreTerminated Breakout Trunk Cable Had an issue with my order. someone actually provided...
5 of 5 Stars!
A Pair of 10/100/1000M Single Fiber 1310/1550nm 10km External Power Supply Mini Gigabit Media Converter I am very satisfied with your Service. Again, thank you...
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FC UPC to ST UPC Duplex PVC/LSZH/OFNP 9/125 Single Mode Fiber Patch Cable Very good product.
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Thursday 18 January, 2018 | RSS Feed

Passive DWDM vs. Active DWDM

by Fiber-MART.COM

DWDW is short for dense wavelength division multiplexing. It is an optical multiplexing technology used to increase bandwidth over existing fiber networks. DWDM works by combining and transmitting multiple signals simultaneously at different wavelengths on the same fiber. It has revolutionized the transmission of information over long distances. DWDM can be divided into passive DWDM and active DWDM. This article will detail these two DWDM systems.
 
Passive DWDM
Passive DWDM systems have no active components. The line functions only due to the optical budget of transceivers used. No optical signal amplifiers and dispersion compensators are used. Passive DWDM systems have a high channel capacity and potential for expansion, but the transmission distance is limited to the optical budget of transceivers used. The main application of passive DWDM system is metro networks and high speed communication lines with a high channel capacity.
 
Active DWDM
Active DWDM systems commonly refer to as a transponder-based system. They offer a way to transport large amounts of data between sites in a data center interconnect setting. The transponder takes the outputs of the SAN or IP switch format, usually in a short wave 850nm or long wave 1310nm format, and converts them through an optical-electrical-optical (OEO) DWDM conversion. When creating long-haul DWDM networks, several EDFA amplifiers are installed sequentially in the line. The number of amplifiers in one section is limited and depends on the optical cable type, channel count, data transmission rate of each channel, and permissible OSNR value.
 
The possible length of lines when using active DWDM system is determined not only with installed optical amplifiers and the OSNR value, but also with the influence of chromatic dispersion—the distortion of transmitted signal impulses, on transmitted signals. At the design stage of the DWDM network project, permissible values of chromatic dispersion for the transceivers are taken into account, and, if necessary, chromatic dispersion compensation modules (DCM) are included in the line. DCM introduces additional attenuation into the line, which leads to a reduction of the amplified section length.
 
Passive DWDM vs. Active DWDM
Both passive DWDM and active DWDM have their own pros and cons.
 
Pros and Cons of Passive DWDM
Cost savings: unlike active backbone networks with amplifiers and dispersion compensators, the passive DWDM allows to arrange a high speed system having high channel capacity with substantial cost savings.
 
Less complex: passive DWDM isn’t complex at all. It’s really plug and play, and there is nothing to provision.
 
Even though passive DWDM has the two main benefits, it still has the drawback.
 
Scalability: you are limited to colored optics, and less wavelengths on the transport fiber. As you grow, you would be required to have more passive devices. Furthermore, with the more passive devices, you have more difficulty to manage. And you will have to start managing the same wavelength on multiple passive devices and they could be serving different purposes on each depending on your setup.
 
Control: if you need to change a wavelength or connection for whatever reason, your option is limited to taking it out of service and disconnecting the physical cabling as the wavelength is tied to the optic.
 
Pros and Cons of Active DWDM
Active DWDM can fit more wavelengths onto a single fiber pair. The composite signal that is sent over a single fiber pair can carry more bandwidth than a passive of the same size could. In turn, you don’t need as much physical fiber between your two sites. This is advantageous when distance is a problem because it allows you to get more out of a single fiber pair as opposed to passive.
 
Active setups grant you more control over your optical network. You can dynamically re-tune wavelengths without dropping connections. It’s transparent to whatever is riding on that wavelength. Moreover, active DWDM can be easier to scale as your network grows. You can fit more wavelengths on the fiber.
 
Active DWDM has drawbacks, too.
 
Expensive: active DWDM setups are extremely expensive compared to passive DWDM. If you don’t need that long distance requirements, not choose active DWDM.
 
Configuration: depending on your vendor, configuration can be a serious undertaking, and require a solid understanding of optical networks. There are many more components in active builds. DWDM necessarily require transponders, further, after muxing the signals, they typically need active amplification to have any interesting reach. Without this, you’re only going a relatively short distance.
 
Summary
No matter passive DWDM or active DWDM, choose the one that best suits your network. Knowing their own features can help you better judge which one you need. DWDM mux/demux is a must in both passive DWDM and active DWDM. fiber-mart.COM offers a series of DWDM mux/demux. If you need to buy DWDM mux/demux, fiber-mart.COM is a good place. Visit www.fiber-mart.com or contact us over sales@fiber-mart.com for the details.




Single Fiber CWDM MUX and DEMUX Tutorial

by Fiber-MART.COM

In CWDM networks, bidirectional CWDM MUX DEMUX (also called dual fiber CWDM MUX DEMUX) uses the same wavelengths for transmitting and receiving. It is often used in dual way transmission applications. The working principle is easy to understand. A duplex fiber cable links two dual-fiber CWDM MUX DEMUXs supporting the same wavelengths installed on each end of the fiber optic network. The wavelengths of the two fibers are the same, but they are running on the different directions for duplex transmission. However, in some cases, there is only one fiber available for network capacity expansion. Then, single fiber CWDM MUX and DEMUX is being used, which is very different from the dual-fiber one.
 
Understand Single Fiber CWDM MUX and DEMUX
The single fiber CWDM MUX DEMUX has a simplex line port (shown in the above picture), which is the biggest difference from the bidirectional CWDM MUX DEMUX on the appearance. There are also some single fiber CWDM MUX and DEMUX are made with a duplex port. But only one port of this duplex port is in use, the other is usually marked with N/A. For instance, our FMU single fiber CWDM MUX DEMUX also uses this design.
 
The reason why single fiber CWDM MUX and DEMUX can achieve dual way transmission is because it uses the CWDM wavelengths in a different way compared with the bidirectional CWDM MUX DEMUX. In bidirectional CWDM network, each wavelength runs on two opposite directions. However, in single fiber CWDM network, each wavelength just runs on one direction. In other works, if you want to build a dual way transmission link between two sites, you can use one wavelength over duplex fiber with dual-fiber CWDM MUX DEMUX, or use two wavelengths (one for TX and the other for RX) over simplex fiber with single fiber CWDM MUX DEMUX.
 
The above picture shows how CWDM wavelengths are used in a single fiber CWDM network. In this network, 16 wavelengths are used to support 8 pairs of dual-way transmission. On site A, there deployed an 8-channel single fiber CWDM MUX DEMUX using 8 wavelengths for transmitting and the other 8 wavelengths for received. On the opposite site B, also a single fiber CWDM MUX and DEMUX is deployed. However, the wavelengths for TX and RX are reversed. For instance, a pair of dual-way signal uses 1270nm for TX and 1290nm for RX on site A, while use 1290nm for TX and 1270nm for RX on site B. This is how the single-fiber CWDM MUX and DEMUX achieving dual-way transmission.
 
How to Select Fiber Optic Transceiver for Single Fiber CWDM MUX and DEMUX
Some might get confused about how to select the CWDM transceivers for single fiber CWDM network as there are two different wavelengths on a duplex channel port. The selection for single fiber CWDM MUX DEMUX is mainly based on the wavelength for TX. Still take the above mentioned example, on site A 1270nm is used for TX, thus, a 1270nm CWDM transceiver should be used. On site B, a 1290nm CWDM transceiver should be used. The fiber optic transceivers used for single fiber CWDM MUX and DEMUX are different on the two sites.
 
Single Fiber CWDM MUX DEMUX Case Study
Here offers a case of how to use single fiber CWDM MUX and DEMUX to build CWDM network which supports four pairs of dual-way signals. To build such a single fiber CWDM network, eight different wavelengths should be used. Here we use two of our FMU 4 channel CWDM MUX DEMUX to show the details. These two single fiber CWDM MUX DEMUX can be used together. The following shows their channel port details.
 
The following picture shows how to build a 10G single fiber CWDM network. As clearly showed, all the wavelengths just go in one direction. CWDM SFP transceivers working on 1470nm, 1510nm, 1550nm and 1590nm are linked with the CWDM MUX and DEMUX on one side of the network. The other CWDM MUX DEMUX deployed on the other end of the network is connected with CWDM SFP transceiver working on wavelengths of 1490nm, 1530nm, 1570nm, 1610nm. Thus, eight wavelengths are used for 4 pair dual-way transmission in this single fiber CWDM network.
 
fiber-mart.COM Single Fiber CWDM MUX DEMUX Solution
The above mentioned products for CWDM network are all available in fiber-mart.COM. Various CWDM MUX DEMUX and CWDM transceivers including CWDM SFP/SFP+/XFP are available and can be customized. Please note the special ports like expansion port and monitor can also be added and they are all simplex. Kindly contact sales@fiber-mart.com for more details if you are interested.




How to Use Field Assembly Connector?

by Fiber-MART.COM

The expansion of FTTH application has brought prosperity to the manufacturing of field assembly connectors for fast field termination. This type of connector gains its popularity due to the applicability to cable wiring and compact bodies which are easily stored in optical fiber housings. With excellent features of stability and low loss, field assembly connector has now become a reliable and durable solution for fiber optic systems. However, do you really know the field assembly process of the connector? This article provides an easy guide to show you the way of using field assembly connector.
 
Introduction to Field Assembly Connector
Before getting to know the instruction process, let’s have a look at the basic knowledge about field assembly connector. Field assembly connector or fast connector is an innovative field installable optical fiber connector designed for simple and fast field termination of single fibers. Without using additional assembling tools, field assembly connector can be quickly and easily connected to the drop cable and indoor cable, which saves a lot of required termination time. It is specially designed with the patented mechanical splice body that includes a factory-mounted fiber stub and a pre-polished ceramic ferrule. Field assembly connector is usually available for 250 µm, 900 µm, 2.0 mm and 3.0 mm diameter single-mode and multimode fiber types. The whole installation process only takes about 2 minutes which greatly improves the working efficiency.
 
Internal Structure of Field Assembly Connector
From the following figure, we can see the specific internal structure of field assembly connector. The ferrule end face of the connector is pre-polished in a factory for later connection with the fiber. A mechanical splice is also formed at the end of the ferrule for mechanical fixation of optical fiber. The mechanical splice consists two plates, one with a V groove, another with flat surface above the V groove, and a clamp for the insertion of the two plates. When inserting the fiber, a wedge clip will keep the V groove open for easier installation. After the fiber insertion, the wedge clip can be extracted from the V groove.
 
Features and Applications
Key Features
Field-installable, cost-effective, user-friendly
No requirement for epoxy and polishing
Quick and easy fiber termination in the field
No need for fusion splicer, power source and tool for pressure
Visual indication of proper termination
Applications
Fiber optic telecommunication
Fiber distribution frame
FTTH outlets
Optical cable interconnection
Cable television
Field Assembly Instruction Guide
Although it is an simple way to use field assembly connector, the right operation process is also important. Here will introduce some basic steps for connector installation.
 
Step 1, prepare the field assembly connector parts and related tools required during the process. There is no need for special tools, but fiber cleaver and jacket stripper are still necessary.
 
Step 2, insert the connector boot into the fiber cable.
 
Step 3, cut and reserve 10mm bare fiber by fiber cleaver and then make sure the total fiber length of 30 mm.
 
Step 4, insert the fiber from bottom until the stopper and make fiber present micro bend.
 
Step 5, press the press cover to tight the bare fiber.
 
Step 6, lock the boot with yarn.
 
Step 7, cut the yarn.
 
Step 8, screw the boot and put on housing to complete assembly.
 
 
 
Precautions
Here are some precautions for you to notice during the process:
 
Point 1, the product is sensitive to dirt and dust. Keeping it away from any possible contamination is necessary.
 
Point 2, the performance will be influenced by the fiber cutting surface condition. Use a cutter with a sharp blade for the best results.
 
Point 3, insert the fiber into the connector slowly. If the fiber is roughly inserted, it might be damaged or broken, leading to failure of connector installation. Broken fiber could scatter in all directions.
 
Point 4, do not remove the dust cap until the connector has been completely assembled in order not to cause a high insertion loss.
 
Point 5, a proper amount of index matching gel is applied in the connector. Do not insert fiber more than once into connector.
 
Conclusion
Fiber assembly connector enables quick termination to improve reliable and high connector performance in FTTH wiring and LAN cabling systems. All the above solutions provided by fiber-mart.COM are available to meet your requirements. Please visit the website for more information.





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