CWDM DWDM Networking Solutions

Wavelength division multiplexing is a cost effective and efficient way for expanding the fiber optic transmission capacity, because it allows using current electronics and current fibers and simply shares fibers by transmitting different channels at different color (wavelength) of light.
Wavelength Division Multiplexing, WDM is a technique that multiplexing several signals over a single fiber optic cables by optical carriers of different wavelength, using light from a laser or a LED. According to the number of wavelengths it supports, there are Coarse Wavelength Division Multiplexing (CWDM) and Dense Wavelength Division Multiplexing (DWDM).
CWDM was introduced as a low-cost approach to increasing bandwidth utilization of the fiber infrastructure. By using several wavelengths/colors of the light, 18 channels are viable and defined in the ITU-T standard G.694.2. CWDM systems typically provide 8 wavelengths, separated by 20nm, from 1470nm to 1610nm.
Benefits of CWDM
Passive equipment that uses no electrical power
Extended Temperature Range (0-70C)
Much lower cost per channel than DWDM
Scalability to grow fiber capacity with little or no increased cost
Protocol Transparent
Simple to install and use
Drawbacks of CWDM
16 channels may not be enough
Passive equipment offers no management capacities
DWDM packing WDM channels denser than in CWDM systems, 100 GHz spacing (approx. 0.8nm), more channels and higher capacity can be achieved using DWDM. IUT-T recommendation G.694.1 defines the DWDM channels spectrum. DWDM comes in two different versions: an active solution and a passive solution. An active solution is going to require wavelength management and it a good fit for applications involving more than 32 lines over the same fiber. In most cases, passive DWDM is looked at as a more realistic alternative to active DWDM.
Benefits of DWDM
Up to 32 channels can be done passively
Up to 160 channels with an active solution
Active solutions typically involve optical amplifiers to achieve longer distances
Drawbacks of DWDM
DWDM is very expensive
Active solutions require a lot of set-up and maintenance expense
"Passive" DWDM solution still requires power
Optical Add/Drop Multiplexing (OADM)
By optical add/drop multiplexing techniques, wavelength channels may be added and dropped at intermediate nodes using passive optical components only. Optical Add/Drop Multiplexers are used in WDM Systems for multiplexing and routing fiber optic signals. They can multiplex several low-bandwidth streams of data into a single light beam, and simultaneously, it can drop or remove other low-bandwidth signals from the stream of data and direct them to other network routers. There are CWDM OADM and DWDM OADM.
FiberStore offer a wide range of WDM optical networking products that allow transport of any mix of service from 2Mbps up to 200Gbps. Our highly reliable WDM/CWDM/DWDM products include CWDM
multiplexers and demultiplexer, DWDM Multiplexers and demultiplexers, CWDM & DWDM Optical Add-drop Multiplexer, Filter WDM modules, CATV amplifier, OEO converters as well as many other most demanding CWDM DWDM networking infrastructure equipment.

Fiber Identifier Supplied by FiberStore

As we know, fiber identifier is an essential tool for fiber optic lossless installation and maintenance work, which can be used for both single mode and multimode optical fiber probing anywhere. In the fiber optic maintenance, installation, wiring and recovery period, we often need to find and isolate a specific optical fiber without interrupting the operations. By inject a 1310 or 1550 optical signals with specific modulated signal from one end into the optical fiber, with the fiber identify on the way to find it out. It can also used to indentify the traffic direction that indicated by LED with illumination. In the working process of the fiber indentify, use the appropriate chuck, firmly grip the bare fiber or pigtails into the testing area, turn on the tool to start testing. During this process, the fiber optic identifier won’t generate harm or damages to the fiber cable.
Why we need to the fiber identifier?
During out daily fiber optic maintenance work, we often need to cutover, splice or connect the fiber optic cables. In order to accurately detect the working conditions of the fiber core, we always need use an optical identifier to determine. If traffic is present on the fiber under test, an audible tone can be heard.

FiberStore, a reputable online stocking distributor of fiber optic tools and a complete range of fiber optic related products, has recently released a reliable and portable optical fiber identifier AFI400, which is specially designed for engineers and technicians that work in the construction and maintenance of optical fiber communication and optical fiber CATV systems. These AFI400 fiber identifier is idea to indentify excessive problem fibers (excessive loss, dark, live fiber) that may be caused by misalignment of mechanical splices or poor connections. This optimized device can indentifies multiple signal frequencies including 270HZ, 1Khz and 2Khz and used for testing H0.25, 0.25mm, 0.9mm, 3.0mm fiber. It operates at a wavelength range of 800nm to 1700nm and works. Powered by 2 units of 1.5V AA alkaline batteries, it can work at least ten hours on a full charge. Besides, the fiber chuck , with mechanical damping design, can ensure that no fiber damages occurred. Meantime, it has both sound and light alarm function and key lock function, making it easier and more comfortable to operate.
Features
Support to detect optical signals without disrupting traffic
Based on non-destructive technology
Indicate the signal direction in fiber
Detect a variety of optical tones, 270Hz, 1kHz and 2kHz
Build in visible fault locator 1mW or 10mW optional;
Battery low indication
Specifications
Working wavelength: 800-1700nm
Type identification signal CW, 270HZ ± 5%, 1KHZ ± 5%, 2KHZ ± 5%
Probe Model: Ø1mm InGaAs2pcs
Adapter type (mm) Ø 0.25 Ø 0.9/2.0/3.0 used for bare fiber pigtail
Signal direction: LED indicates
Optical frequency: 270Hz, 1KHz, 2KHz LED indicator shows
Batteries: Powered by 2 units of 1.5V AA alkaline batteries
Operating Temperature (° C) -10 ~ +60
Storage temperature (° C) -25 ~ +70
FiberStore is a global leader in research, development and manufacturing of high performance optical fiber tools and network equipment. For our optical fiber identifier, we provide one year warranty for that. You can also buy this AFI400 at a large quantity with the wholesale price. If you are the one have such requirement, why not contact us, I’m sure you will get good surprise on our product and service.

How to Clean Fiber Optic Connectors

Fiber optic cleaning is one of the most important procedures in the maintenance of fiber optic system, which need to keep the quality connections between all fiber optic equipment. As we know, the fiber optic connector consists of fiber optic plug and the adapter. The ends of the fiber optic cables are held in the core of ferrule in the plug. Keeping the fiber end face and ferrule absolutely clean is very essential, since any particles on the end face of the fibers will cause problems such as scratching the glass surface, instability in the laser system, and a misalignment between the fiber cores, which may as a result disrupt the light transmission between the fiber optical system.
For proper performance of the SC fiber optic cable, you must keep the SC connector clean and free of dust. Small micro-deposit of oil and dust in the canal of the connector could cause loss of light, reducing signal power and possible causing intermittent problems with the optical connections. Below picture show the part of the end face of an unclean and clean ferrule of SC connectors.
Steps to follow before the fiber optic cleaning
Before cleaning the fiber optic connectors, make sure to disconnect the fiber optic cables from both ends and then turn off any laser source.
Do not allow the end of the fiber optic cable to make contact with any surface including your fingers.
Never to bend the fiber cable, which will in turn cause internal breaks along the fiber and cause poor performance or instability.
Use the finger cots or powder free surgical gloves to handle the fiber optic cables. use fresh spectroscopic grade Methanol or Isopropyl Alcohol as the only cleaning solvent.
In the daily connection work, a connector housing should be used when plugging or unplugging a fiber. A protective cap should be used to cover the unplugged fiber connectors. In the process of the fiber optic cleaning, the end face of the connector should never be touched and also the clean area of a tissue of swab should not be touched or reused.
Cleaning fiber ends
At the beginning of cleaning job, a fiber microscope should be used to inspect the fiber end, if it is contaminated as either images shows below, it should be cleaned with the dry cleaning method.

1.Blow the fiber surface with a stream of Clean Dry Air (the so called CDA), which will dislodge larger, loose particles. Keep in mind, don’t tip the can of the CDA while blowing. Because the liquid may be released contaminant on the surface of the fiber.
2.Place 1-3 drops of spectroscopic grade methanol or isopropyl alcohol in the center of a lens tissue. Do not use Acetone as a cleaning solvent on the fiber optical surfaces. Besides, to ensure the purity of the methanol or alcohol, you should never insert the lens tissue or swabs into the liguid.
3.Hold the fiber by the connector. Place the wet portion of the lens tissue on the optical surface and slowly drag it across. At this step, don’t use lens paper to dry it because the dry lens paper is extremely abrasive.
4.Examine the surface of the fiber under high density light using a magnifier, an optical loop, or a video inspection tool. If streaks or contaminants still remain, repeat the process using a fresh lens tissue.
5.Immediately install a protective cover over the end of the cable to avoid re-contamination or insert the fiber for immediate use.
FiberStore provides all kinds of Fiber optic cleaner, such as the Cletop Reel Type cleaner, Neoclean-E-Pen Cleaner basic set, Cartridge-Type Cleaner, OAM connector cleaners are also good solutions, all of them are brand new and manufactured following strict industrial standards. You can follow the instruction documents to conduct your fiber optic connector cleaning job with cleaning kit you need.

How to Clean Fiber Optic Connectors

Fiber optic cleaning is one of the most important procedures in the maintenance of fiber optic system, which need to keep the quality connections between all fiber optic equipment. As we know, the fiber optic connector consists of fiber optic plug and the adapter. The ends of the fiber optic cables are held in the core of ferrule in the plug. Keeping the fiber end face and ferrule absolutely clean is very essential, since any particles on the end face of the fibers will cause problems such as scratching the glass surface, instability in the laser system, and a misalignment between the fiber cores, which may as a result disrupt the light transmission between the fiber optical system.
For proper performance of the SC fiber optic cable, you must keep the SC connector clean and free of dust. Small micro-deposit of oil and dust in the canal of the connector could cause loss of light, reducing signal power and possible causing intermittent problems with the optical connections. Below picture show the part of the end face of an unclean and clean ferrule of SC connectors.
Steps to follow before the fiber optic cleaning
Before cleaning the fiber optic connectors, make sure to disconnect the fiber optic cables from both ends and then turn off any laser source.
Do not allow the end of the fiber optic cable to make contact with any surface including your fingers.
Never to bend the fiber cable, which will in turn cause internal breaks along the fiber and cause poor performance or instability.
Use the finger cots or powder free surgical gloves to handle the fiber optic cables. use fresh spectroscopic grade Methanol or Isopropyl Alcohol as the only cleaning solvent.
In the daily connection work, a connector housing should be used when plugging or unplugging a fiber. A protective cap should be used to cover the unplugged fiber connectors. In the process of the fiber optic cleaning, the end face of the connector should never be touched and also the clean area of a tissue of swab should not be touched or reused.
Cleaning fiber ends
At the beginning of cleaning job, a fiber microscope should be used to inspect the fiber end, if it is contaminated as either images shows below, it should be cleaned with the dry cleaning method.

1.Blow the fiber surface with a stream of Clean Dry Air (the so called CDA), which will dislodge larger, loose particles. Keep in mind, don’t tip the can of the CDA while blowing. Because the liquid may be released contaminant on the surface of the fiber.
2.Place 1-3 drops of spectroscopic grade methanol or isopropyl alcohol in the center of a lens tissue. Do not use Acetone as a cleaning solvent on the fiber optical surfaces. Besides, to ensure the purity of the methanol or alcohol, you should never insert the lens tissue or swabs into the liguid.
3.Hold the fiber by the connector. Place the wet portion of the lens tissue on the optical surface and slowly drag it across. At this step, don’t use lens paper to dry it because the dry lens paper is extremely abrasive.
4.Examine the surface of the fiber under high density light using a magnifier, an optical loop, or a video inspection tool. If streaks or contaminants still remain, repeat the process using a fresh lens tissue.
5.Immediately install a protective cover over the end of the cable to avoid re-contamination or insert the fiber for immediate use.
FiberStore provides all kinds of Fiber optic cleaner, such as the Cletop Reel Type cleaner, Neoclean-E-Pen Cleaner basic set, Cartridge-Type Cleaner, OAM connector cleaners are also good solutions, all of them are brand new and manufactured following strict industrial standards. You can follow the instruction documents to conduct your fiber optic connector cleaning job with cleaning kit you need.

Top 7 Advantages of Fiber Optic Cabling

Compared with the traditional standard copper coaxial cables, fiber optic cabling is a brand new and advanced method used in modern telecommunication and data transmission networking applications.In fiber optic networking system, fiber optic cable and end equipment use light pulses to transmit data. Light resource, Fiber optic cable and optical transceiver play a leading role in the whole transmission process. Fiber optic cables are made up of transparent glass or plastic fibers which allow light to be guided from one end to the other with minimal loss. Fiber optic cabling has obvious advantages over copper cabling when it comes to transmission efficiency, capacity, material cost and even environmental friendliness. Here are the detailed top 7 advantages of fiber optic cabling versus copper cabling.

1. Great transmission capacity
Compared with traditional copper, working frequency of fiber optic is 8-9 orders of magnitude higher, which work a greater carring capacity. Fiber optic cable is capable of carrying far more data than copper. Besides, it can also carry the information for much more distances. For example, a fiber optic can easily transmit a signal as far as 80 km or more without the need for amplification.
2. More transmission efficiency
In comparison, fiber Optic cables can transmit far more information, and with a greater degree of fidelity. Fiber links offer over 1,000 times as much bandwidth over distances over 100 times further than copper. For example, downloading a 2 GB movie over a typical "Fast Ethernet" connection (100 Mbps) would take almost 22 minutes. While, downloading the same movie over GPON with fiber optic cabling, and it would only take about 2 minutes. By providing quicker access to volumes of data that will empower end-users to be more productive.
3. Energy saving and environmental friendly
The equipment used for a Gigabit Passive Optical Network (GPON) fiber optic implementation is typically about 50% more energy efficient than the traditional networking equipment found in a IDF/Telco closet. This reduction in energy consumption for the IT network also means there is a huge reduction in the amount of Greenhouse Gas emitted into the atmosphere.
4. Free of interference
Unlike electrical cables which conduct with electricity, fiber optic cables are glass-based carring light signals. This eliminates the need for grounding and makes them immune to any type of electrical interference - even lightning. Taking the advantages of resistance to interference and atmospheric conditions, outdoor fiber optic cables can be used outdoors and even in close proximity to electrical cables without concern.
5. More data secured
Except for interference-free, class fibers can also work well in roughing conditions. We know, copper cabling is sensitive to water and chemicals, class fiber optic cabling runs nearly no risk of being damaged by harsher elements. Fiber Optic cables can easily endure living environment that coaxial cable just cannot, such as being buried with soil, or in close proximity to chemicals. Besides, since it is also far more difficult to tap, fiber Optic cabling would offers extra security for the data being transmitted.
6. Easy handling and installation
Fiber optic cables are much smaller and lighter as compared to copper-based cables, which make it much easier to handle and require less time and effort to install. In addition, the carriers would never get shocked when the fiber optic cables are break as the electrical coaxial cables do. Since Fiber optic cabling transmits light and not electricity, the people handling it run no risk of injury from fire, sparking or electrocution.
7. Cost effective
With the development of fiber optic technology, fiber optic cable is no longer always thought to be too fragile or expensive to the deployed for general applications, by contract, it has becomes more easier to work with and install. With various cable metal material price rising on the present market, while optic fiber has declined and the manufacturing processes have also been improving, Which has created an important prerequisite for the quick development of optical fiber communication.

Fiber optic cabling is being deployed in buildings, campuses and offices to provide an efficient, high-speed broadband network for end users. Fiber optic network can transmit larger quantities of data with far less loss, is able to delivery signals over long distances, carries little risk of corrosion, is with great environmental features and virtually free from interference. That’s the concludes from Ingellen.com, among the worlds foremost providers of fiber optic cables, fiber cable management solutions and other fiber networking and equipment management solutions for both business and home utilizations.