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FAQ

  • Q Precision Cleavers

    Precision cleavers are the most commonly used cleavers in the industry. They use a diamond or tungsten wheel/blade to provide the nick in the fiber. Tension is then applied to the fiber to create the cleaved end face. The advantage to these cleavers is that they can produce repeatable results through thousands of cleaves by simply just rotating the wheel/blade accordingly. Although more costly than scribe cleavers, precision cleavers can cut multiple fibers while increasing speed, efficiency, and accuracy. In the past, many cleavers were scribes, but over time, as fusion splicers became available and a good cleave is the key to low splice loss, precision cleavers were developed to support various applications and multiple fiber cleaving with blades that have a much longer life span.

    Precision Cleaver

  • Q Scribe Cleavers

    A traditional cleaving method, typically used to remove excess fiber from the end of a connector before polishing, uses a simple hand tool called a scribe. Scribe cleavers are usually shaped like ballpoint pens with diamond tipped wedges or come in the form of tile squares. The scribe has a hard, sharp tip, generally carbide or diamond, that is used to scratch the fiber manually. Then the operator pulls the fiber to break it. Since both the scribing and breaking process are under manual control, this method varies greatly in repeatability. Most field and lab technicians shy away from these cleavers as they are not accurate. However, if in skilled hands, this scribe cleaver offer significantly less investment for repairs, installation, and training classes.

    Scribe

  • Q Two Types of Fiber Optic Cleavers

    We know that the closer to 90 degrees the cleave is, the more success you will have with matching it to another cleaved fiber to be spliced or mated by a connector. So it’s important to use the proper tool with good technique to consistently achieve a 90 degree flat end. Good cleavers are automatic and produce consistent results, irrespective of the operator. The user need only clamp the fiber into the cleaver and operate its controls. Some cleavers are less automated, making them more dependent on operator technique and therefore less predictable. There are two broad categories of fiber optic cleavers, scribe cleavers and precision cleavers.
  • Q What Is Fiber Optic Cleaver?

    A cleave in an optical fiber is a deliberate, controlled break, intended to create a perfectly flat end face, perpendicular to the longitudinal axis of the fiber. A fiber optic cleaver is a tool that holds the fiber under low tension, scores the surface at the proper location, then applies greater tension until the fiber breaks. Usually, after the fiber has been scored, the technician will use a cleaver either bend or pull the fiber end, stressing the fiber. This stress will cause the fiber to break at the score mark, leaving a 90 degree flat end if all goes well. So the cleaver doesn’t cut the fiber. In fact, it just breaks the fiber at a specific length.
  • Q A Good Fiber Optic Cleaver Helps Cut Out Costly Mistakes

    To get good fiber optic splices or terminations, especially when using the pre-polished connectors with internal splices, it is extremely important to cleave the fiber properly. If the fiber ends are not precisely cleaved, the ends will not mate properly. To prepare a fiber end for a connector or splice, the end of the fiber must be cleaved to a 90 degree flat end. For technicians the problem is that the end of the fiber strand is so small that it is impossible to tell with the naked eye whether the strand has a flat end. So in order for this to happen, you must use a cleaving tool called fiber optic cleaver. Some knowledge of fiber optic cleaves will be provided in this article.


    good and bad fiber cleave
  • Q When should DCM be used?

    Dispersion compensation module (DCM) should be used when the chromatic dispersion caused by your distance exceeds what your receiver optical module can handle. So the answer is “it depends”. If you’re using 1000BASE DWDM optics, then it will be fine. If you’re using 10GBASE DWDM optics, then it depends on the distance they were designed to handle.
  • Q When to use EDFA AGC mode and when to use EDFA APC mode?

    An EDFA has two modes of operation: AGC (automatic gain control) and APC (automatic power control). The AGC mode is favored for a multi-channel WDM system where the amplifier gain needs to be kept constant, regardless of the number of newly lit channels. Conversely, the APC mode keeps the output power constant and is mostly used in cases where the output power value plays an important role and where the channel count is low.
  • Q How to use EDFA in DWDM network?

    Booster amplifier—placed immediately after the transmitter, it is used to increase the output power at the beginning of the link.

    In-line amplifier—placed in the middle of an optical link, it is used to increase the power level at the end of the transmission line according to receiver sensitivity.

    Pre-amplifier—placed in front of an optical receiver, it is used to compensate the attenuation of the link.

  • Q How to select DWDM channels?

    There are no standards. But some points can be kept in mind. Higher channel number would lead to higher giant of EDFA on this channel. When choosing consequent number of channels, it could trigger four-wave mixing (FWM) effect. You have to leave blank channels between neighboring channels.
  • Q What’s the difference between dual fiber line port and single fiber line port?

     Dual fiber Mux/Demux uses the same wavelength for dual-way transmission. It means the TX port and RX port of every duplex channel port supporting the same wavelength. The WDM Mux/Demux with dual fiber line ports installed on the two ends of the network could be the same.

    For single fiber Mux/Demux, all the wavelengths flow in one direction. And the TX port and RX port of every duplex channel port support two different wavelengths. If you choose a single fiber Mux/Demux on one side of the network, on the other side, there should be a single fiber Mux/Demux which supports the same wavelengths but has the reverse order on the TX port and RX port of every duplex channel port.

  • Q Do you know the special ports of DWDM Mux/Demux?

    The special ports of DWDM Mux/Demux include express and upgrade port, monitor port and 1310nm port.

    Express and Upgrade Port—For DWDM Mux/Demux, the purpose of an upgrade port is to add, drop, or pass through C-band DWDM channels not already in use, i.e., only channels that reside in the band 1530-1565 nm. If the DWDM Mux/Demux also has an express (or expansion) port, then that port is normally used for additional channels residing outside the C-band, such as most of the CWDM channels.

    Monitor Port—This port is used to monitor or test the power signal coming out of a muxed DWDM or before it gets demuxed from the signal coming through the fiber network, usually at a 5% or less power level.

    1310nm Port—The 1310nm port is used in some legacy networks and sometimes as a return path. With the special designed 1310nm port, the signal running through ordinary fiber optic transceivers can be combined together with other wavelengths.

  • Q What’s the IL (insertion loss) of your DWDM Mux/Demux?

     

    The IL of a WDM product is given as the maximum insertion loss occurring at the channel port with the highest loss. Usually, IL is a focus point during the selection of DWDM Mux/Demux. The following table shows the typical and maximum insertion loss of FS DWDM Mux/Demux.

    AAWG technology 3 dB (Typical) 4.5 dB (Max)
    TAWG technology 3.5 dB (Typical) 5 dB (Max)

    The picture below demonstrates the max insertion loss values of 40 channels DWDM Mux/Demux offered by different vendors for your reference.

     max-insertion-loss-comparison-of-40ch-dwdm-mux-demux-in-the-market

     

     

  • Q Why is fiber preferred to copper or coaxial cable?

    Optical fiber is unique because it can carry a high bandwidth signal enormous distances.

    The longer the distance the signal travels on copper or coaxial cable, the lower the bandwidth.

    Fiber networks can also be upgraded by changing the electronics or using different lasers that increase the bandwidth

    without changing the fiber itself. That’s why fiber networks are said to be “future proof.”
  • Q Is it okay to print “Corning” on the cable your company provides?

    Yes. But we can only print “Coring Fiber Cable” not “Corning Cable” on our cables.
  • Q Can your components or adapters be printed with our own LOGO?

    Yes. But customers shall pay the mould which is newly made for the LOGO. The purchase quantity is unlimited. When

    the purchase quantity reaches a certain amount (unfixed), we will return the mould fee to buyers step by step according

    to the type and unit price of the products they buy. Customers can communicate with our clerks about the specifics.

  • Q what is ONFCG cable

    OFCG stands for Optical Fiber Conductive General-Purpose. They have the same fire characteristics as OFNG cables but they have conducting armor or central strength members which is typically steel. OFCG cables should be properly grounded at both ends. They should not be installed in the same cable tray or conduits as power cables.
  • Q what is OFNG cable

     OFNG stands for Optical Fiber Nonconductive General-Purpose. They are typically used in horizontal cabling, single floor applications. OFNG cables can not be used in plenums or risers. OFNP and OFNR cables both can be used as substitutes for OFNG cables.
  • Q what is ONFCR cables

    OFCR stands for Optical Fiber Conductive Riser. OFCR cables have the same fire rating characteristics as OFNR cables but they have conducting armor or central strength member which is usually steel. OFCR cables should also be properly grounded at both ends. OFCP cables can be used as substitutes for OFCR cables. OFCR cables can not be installed in the same cable trays or conduits as power cables.
  • Q what is OFNR

    OFNR stands for Optical Fiber Nonconductive Riser. OFNR cables are used in Riser areas which are building vertical shafts or runs from one floor to another floor. OFNR cables can not be installed in plenum areas since they do not have the required fire and smoking rating as Plenum rated cables. OFNP plenum cables can be used as substitutes for OFNR cables.
  • Q What is OFNP for cable

    OFNP stands for Optical Fiber Nonconductive Plenum. OFNP cables have fire-resistance and low smoke production characteristics. They can be installed in ducts, plenums and other spaces used for building airflow. This is the highest fire rating fiber cable and no other cable types can be used as substitutes.

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Kunshan Kewei Fiber Communcations Equipment Co.,Ltd.

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Fax: 0512-57873993
Mobile: +86 18625257159
Whatspp:+86 18625257159

 E-mail: janewang@keweifiber.com
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