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Category: Fiber Testers & Tools

Choosing the Right Cleaner for Your MPO/MTP Cleaning

Choosing the Right Cleaner for Your MPO/MTP Cleaning

There are various kinds of fiber optic cleaning tools in the market nowadays. In the previous post “Cleaning Tools for Fiber Optic End-face Cleaning” we have presented the importance of cleaning and several kinds of popular tools for fiber optic cleaning in the modern fiber optic systems. MPO/MTP connector and adapter is a multi-fiber assembly that is widely used in today’s parallel and high-density network cabling. Just like other fiber optic connectors and adapters, such as LC, SC, FC, etc., the end-face of the MPO/MTP also requires to keep clean in order to ensure the best optical performance. Since the MPO/MTP is special, there is a specific cleaner for MPO/MTP cleaning when you choose the one-click pen type. Of course, if you just need to clean the MPO/MTP connector, the fiber optic cassette cleaner may be a better choice that it can support cleaning for almost all kinds of fiber optic connectors.

One-Click Cleaner for MPO/MTP

One-click cleaner, as an easy to use fiber cleaning tool, becomes a necessity for both installers as well as fiber optic technicians and troubleshooters. The most commonly used one-click cleaners are 1.25mm cleaner and 2.5mm cleaner, as well as MTP/MPO cleaner. The 1.25mm cleaner is usually used for LC, LC secure keyed and MU connectors cleaning while the 2.5mm cleaner is used to clean SC, ST, FC and E2000 connectors with either UPC or APC polished ferrules. The MTP/MPO cleaner is mainly used for MPO/MTP based connector cleaning. Some MPO/MTP cleaners can also be used to clean both flat polished multimode and 8° angled single-mode MT ferrules.

A common type of one-click cleaner for MPO/MTP is shown in Figure 1. It consists of several parts including the thumb wheel, cleaning head and protective cap.


Figure 1. One-click MPO/MTP Cleaner

One-click MPO/MTP cleaner can be used to clean multimode and single-mode (angled) MPO/MTP connectors, MPO/MTP connectors in adapters, exposed MPO ferrules, and so on. Without the use of alcohol, just a easy one-click operation, it can help user to clean a variety of contaminates on the end-face efficiently. Figure 2 shows the cleaning details of a one-click MPO/MTP cleaner.

cleaning details of a one-click MPO/MTP cleaner

Figure 2. Cleaning Details of One-click MPO/MTP Cleaner

Fiber Optic Cassette Cleaner

Fiber optic cassette cleaner is an ideal choice for fiber connector cleaning. Because it is designed for effective cleaning of almost all fiber optic connectors with an accessible ferrule including LC, MU, SC, FC, ST, MPO/MTP, MTRJ and so on. Fiber optic cassette cleaner uses a densely woven micro-fiber cleaning fabric to remove harmful contaminates off of the ferrule end face. The cleaning tape can be easily replaced with a simple push button shutter operation which greatly help reduce the cost and minimize unwanted dust. Figure 3 shows us the MPO/MTP cleaning with fiber optic cassette cleaner.

MPO/MTP Cleaning With Fiber Optic Cassette Cleaner

Figure 3. MPO/MTP Cleaning With Fiber Optic Cassette Cleaner

Product Recommendation

Recently, FS.COM has launched some special offers of fiber optic cleaners. The prices are very favorable, and with an adequate stock. If you have any requirement on the fiber optic cleaner, such as 1.25mm, 2.5mm and MTP/MPO cleaners or the fiber optic cassette cleaners, it may be good options for you. For more details, I recommend you to visit the promotion page.

Cleaning Tools for Fiber Optic End-face Cleaning

Cleaning Tools for Fiber Optic End-face Cleaning

Among key sources of loss that can bring a fiber network down, dirty and damaged end-faces are the threat most underestimated. Fiber optics has zero tolerance for dirt! Thus, proper end-face cleaning and inspection are very necessary. Today, three common types of fiber optic cleaning tools will be introduced here.

Lint Free Pads Wetted Cleaning Solution

Wipe-solutionThe lint free pads wetted cleaning solution is a traditional cleaning method for single and multifiber connectors but not in an adapter. It general includes two steps:

  • Step 1. Wipe the pad across the ferrule end face several times to remove contamination.
  • Step:2. Dry the connector by blowing with dry compressed air.

Note: that most shop air supplies have a significant amount of oil that will further contaminate the ferrule, so choose the right dry air.

Pen Type In-Adapter Ferrule Cleaner

Pen type cleaner, also called push-type cleaner, features an easy one push action which quickly and effectively clean the end-face of connectors on jumpers or through adapters. It is a cost-effective per clean option to clean single fiber connector and maximize network performance. In general, several steps are included when using pen type cleaner. Take example of “one-click” cleaner here:

  • Step 1. Select the cleaner model for the connector type to be cleaned, for example, 2.5 mm for SC, FC and ST, and 1.25 mm for LC and MU.
  • Step 2. Remove the guide cap and insert cleaning tip inside the adapter.
  • Step 3. Simply insert the cleaner into an adapter and press the cleaner forward until it clicks.
  • Step 4. Remove the cleaner and replace the cap on it to prevent any contamination of the cleaning tip. Also apply the dust cap to the adapter, or proceed to make the connection.


Note: There is mini pen type cleaner which is useful when the work space is limited and it is difficult for workers to access to adapters.

Reel Cleaner

Reel cleaner is an advanced dry cloth reel cassette with micro-fiber cloth that captures debris and other contamination from ferrule end-faces for single and multifiber connectors. Thus, it is also called cassette cleaner. Compared with pen type cleaner, reel type cleaner can quickly and effectively clean a variety of connectors. Its refillable cleaning tapes makes it ideal for lab, assembly lines and field use. When using reel connector, there are also several steps.


Basic Steps:

  • Step 1. Select the cleaner model for the connector type to be cleaned, basic model for all connectors except MTRJ and MTP/MPO types w/pins, and the slot model for MTRJ and MTP/MPO types with pins.
  • Step 2. Remove the connector dust cap and slide the cover back on the cleaner.
  • Step 3. Slide the end face along the cloth surface several times.
  • Step 4. Replace the dust cap and close the cleaner cover.
  • Step 5. Advance the cleaner reel every 5-10 connectors.

In-Adapter Cleaning:

  • Step 1. Remove the cap from the tip of the cleaner and remove the dust cap from the adapter.
  • Step 2. Insert the cleaner tip into the MTP/MPO bulkhead or adapter.
  • Step 3. Rotate the cleaner wheel (2 clicks) to clean the end-face in the adapter.
  • Step 4. Replace the dust cap and the cleaner cap.


Stand-Alone Connector Cleaning:

  • Step 1. Open the door on the cap at the tip of the cleaner and remove the dust cap from the connector.
  • Step 2. Insert the connector into the cap at the tip into the cleaner.
  • Step 3. Rotate the cleaner wheel (2 clicks) to clean the connector end-face.
  • Step 4. Replace the dust cap and close the door on the cleaner cap.

In addition to the above three cleaning tools, there are a wide variety of tools available to clean end-faces. While the more complex tools may achieve better results, but cost far more money. Users should determine the best approach for the application and budget. In addition, to be remember that the one key criterion for wiping materials is that they be lint-free. Shirtsleeves are unacceptable. Where to buy cost-effective fiber optic cleaning tools and consumables? I will always highly recommend you FS.COM.

Relationship Between Dynamic Range & Dead Zones

Relationship Between Dynamic Range & Dead Zones

OTDR_testOTDR (Optical Time Domain Reflectometer), as an important test instrument, is widely used in OSP (Outside Plant) and premises cabling networks to characterize an optical fiber. Dynamic range and dead zone are two main specifications of an OTDR. So, is there any relationship between them? And what do they mean to OTDR performance?

Dynamic Range

Dynamic range is the dB difference between the initial power level reflected from the fiber under test and the value equal to the noise floor of the detector. It is specified at the OTDR’s largest pulse width when making a measurement for 3 minutes. Dynamic range is one of the most important characteristics of an OTDR, because it determines the maximum observable length of a fiber and the OTDR suitability for analyzing a particular network. The higher the dynamic range, the higher the SNR (Signal to Noise Ratio), and the better the trace and event detection. The dynamic range is relatively difficult to determine because all manufactures do not use a standard computation method. Additionally, depending on the noise level reference, there are many difinitions of dynamic range, as the following picture shown:


Dead Zones

The dead zone of an OTDR is the distance (or time) where the OTDR cannot detect or precisely localize any event or artifact on the fiber link. When a strong reflection occurs, the power received by the detector is saturable. It requires time to recover from its saturated condition. During this time, it will not detect the backscattered signal accurately. We call the length of fiber that is not fully characterized during this period as dead zone. In general, dead zone on the OTDR trace can be divided into event dead zone (EDZ) and the attenuation dead zone (ADZ).


Relationship Between Dynamic Range and Dead Zones

In simple terms, the relationship between dynamic range and dead zone is directly proportional, i.e., the higher the dynamic range, the longer the dead zone. As we know, dead zones can be reduced by using a lower pulse width which will decrease the dynamic range. Why? For example, if more dynamic range is needed to test a longer fiber, a wider test pulse is required which will result in a longer deadzone. Because an OTDR will not have “high dynamic range” for short fiber lengths. So, how to balance the relationship between the dynamic range and dead zones? Two common situations will be introduced in the following:

For Premises Fiber Testing & Troubleshooting
In this case, short dead zones are much more important than dynamic range since the distances are short enough that you do not need a great deal of dynamic range. However, in order to detect patch cords and measure the loss at each end of a short fiber link, short dead zones are required.

For Long-Haul Fiber Testing & Communication
Here, the long-haul applications refers to the distance that is greater than 20 km. In this case, loss of the fiber itself creates a significant amount of loss, thus dynamic range is an important specification for these long fiber links. Additionally, distance range is also important for long links. However, OTDR suppliers do not always specify dynamic range in a meaningful way.


Dynamic range and dead zones are both important specification of OTDRs and they have a directly proportional relationship. As dynamic range increases, the deadzone increases. To balance the relationship between the dynamic range and dead zones should depend on the application enviroment. In addition, due to the specification difference between different OTDR manufactures, it is important to read and understand the fine print in the specification sheets before buying.

Fiber Optic Cable Plants Testing with OTDR

Fiber Optic Cable Plants Testing with OTDR

OTDRIf you are a fiber optic cable (FOC) technician or plants installer, you may be very familiar with Optical Time Domain Reflectometer (OTDR). OTDR testing creates a snapshot of a fiber optic cable. This test is commonly used to verify the quality of the installation and troubleshoot problems. OTDR testing requires interpretation of the data acquired, called the trace or signature, by a skilled operator. No matter you are a beginner or a workflow expert, you should master the basic operation skills and considerations of OTDR to ensure the accuracy and correctness of the test result. This paper is a basic guide of fiber optic cable plants testing with OTDR.

Equipment Needed To Perform This Test
  • OTDR with modules appropriate for the cable plant (e.g. multimode: 850 and/or 1300nm, singlemode, 1310, 1550 and/or 1625nm.)
  • Launch and/or receive reference cables of the same fiber type and size as the cable plant and with connectors compatible to those on the cable plant.Notes:
    a. If you are only testing for length, you only need a launch reference cable. The receive cable allows you to measure loss of the final connector on the cable.
    b. Reference cables must be long enough for the OTDR’s initial test pulse to settle down back to the baseline.c. Connectors on the launch and receive cables must be in good condition (low loss) to properly test connectors on the cable under test.
  • Cleaning supplies.
Test Procedure
  • Turn on OTDR and allow time to warm-up.
  • Set parameters on OTDR appropriate for the cable plant being tested (range, wavelength, number of averages, etc.)
  • Clean all connectors and mating adapters.
  • Attach launch reference cable to OTDR and to cable plant under test.
  • Attach optional receive cable to far end of cable under test.
  • Acquire trace and analyze.

OTDR test diagram

Note: Most OTDRs have an “auto test” function, but these functions are not foolproof. Most problems with OTDR tests occur when untrained users use the autotest function without having an understanding of how the instrument works, what a good trace looks like and, most inportantly, what are the characteristics of the cable plant they are testing (length, number and locations of splices and connectors). Refer to the next section on reading OTDR traces. Once you are confident that the autotest function is giving valid results, it is a major timesaver in OTDR testing.

Options For Testing
  • Use of the receive reference cable is optional, it is required if the far end connector loss is to be measured and included in total cable plant loss
  • Testing at more than one wavelength may be required. Longer wavelength testing is often used to find stress related to installation problems. Traces may be compared for analysis.

Record the date of the test, operator, test equipment used, cable and fiber identification, test wavelength(s) and all traces for the fiber under test.

OTDR Trance Information


  • Insertion loss testing of the cable plant is recommended for acceptance testing.
  • Not all cable plants are long enough for OTDR testing. Ensure the OTDR has sufficient resolution for the cables being tested.
  • Always use a launch cable long enough to allow the OTDR to recover from test pulse overload and permit proper testing of the cable plant.
  • Do not use the OTDR automatic cable analysis until a skilled technician analyzes a trace and confirms it is appropriate for the cable plant under test.


  • Fiber Optic Testing With Optical Time Domain Reflectometers – OTDRs (FOA)
  • OTDR Testing of Fiber Optic Cable Plants (FOA)
Overview Of OTDRs

Overview Of OTDRs

When you need to measure points loss on installed systems, where it is used to find faults and measure point losses such as caused by splicing, turn to an OTDR.


What Is OTDR?

Optical time domain reflectometers (OTDRs) are impressive pieces of equipment which is essentially an optical radar: it sends out a flash of bright light, and measures the intensity of echo or reflections. This weak signal is averaged to reduce detection noise, and computation is used to display a trace and make a number of mathematical deductions. OTDR is most commonly used during installation acceptance and maintenance of outside plant cables. In this role, it is likely to be used to identify point losses, the length of various cables, and to measure return loss.

What Is The Difference Between OTDR Testing And Insertion Loss Testing?

An insertion loss test made with a light source and power meter is a simple test that is similar in principle to how a fiber optic link works. A light is placed on one end of the cable and a power meter measures loss at the other end, just like a link transmitter and receiver use the fiber for communications.

An OTDR works like radar that sends a pulse down the fiber and looks for a return signal from fiber backscatter and reflections from joints, creating a display called a “trace” or “signature” from the measurement of the fiber. From this trace, the OTDR calculates fiber length, attenuation and joint loss. So ODTR does not measure loss directly, it implies it from the trace.

OTDR Limitations
We can use the OTDR to pinpoint breaks in the cable, splices, and connectors, as well as to measure light loss in the system. However, they have the following limitations:

  • High skill requirements – Interpreting the trace requires too much skill for most field technicians. OTDR readings must be analyzed and interpreted by trained and experienced people. These people must rely on the built in automation program to compile data tables, and may have little idea what to do with the trace. Since only highly skilled users can set up the parameters for this automation, in some circumstances most users can get into major difficulty.

  • Limited Accuracy – Limited accuracy when determining the end to end loss of a system. It typically makes a poor job of measuring the loss of the end connectors, which are themselves a cause of problems. In addition, The distance measurement accuracy is only about 1 – 2 % at best. For example a displayed result of 12.1567 Km is actually more realistically 11.91 – 12.39 Km, an uncertainty to field staff of nearly half a Km. The reasons for this are fundamental and are due to variations in cable manufacture and index of refraction. So a measurement of 1 Km, is typically not 1 Km of cable, and certainly not the exact route length. Use of a Cold Clamp can greatly improve distance accuracy.

  • Dead Zone – OTDRs have a “dead zone” that may extend a hundred meters from the unit in which accurate readings are unavailable. You can overcome this limitation if you use a launch cable, but you must carefully interpret the signal trace. Although instruments may advertise an event dead zone of say 5 m, this is only under specific conditions. Inpractice the dead zone may go up to a km for long distance work. This makes these instruments of less use on short systems. Other tools, such as a visible laser, may be required to precisely identify the fault. This has become a big issue as the fibre count in cables has increased, which has caused an increase in the requirement to avoid disturbing already installed closures and racks.

  • Limited Applications – Limited use on “passive optical network” systems that use couplers or splitters to connect one source to multiple locations. This is because measuring in this configuration only works in one direction, and so this method cannot be reliable. Additionally, it can not be used in compliance with new multimode fiberoptics loss measuring standards, which mandate the use on an LED source with defined characteristics.

  • Cost – If you plan to use an OTDR frequently, it makes sense to buy a good one. If not, you’ll want to rent one when you need it, but make sure you rent a unit that was recently calibrated. Moreover, you make know that misapplication of OTDR testing will cost you much in wasted time and materials.

Operating An OTDR

Operating an OTDR is not especially difficult, but it does require familiarity with the particulars of the make and model you are using. To properly operate an OTDR, you generally have to make the following settings:

  • Fiber type: Singlemode or multimode.

  • Wavelength: Singlemode is set for 1310 nm or 1550 nm, and multimode is set for 850 nm or 1300 nm.

  • Measurement parameters: The typical parameters to be set are distance range, resolution, and pulse width.

  • Event threshold: This determines how much loss or change will be tagged as an event.

  • Index of refraction: This is the speed of light in that fiber. You can obtain this figure from the fiber manufacturer. In most cases you can take it directly from a standard specsheet.

  • Display units: These are usually labeled in feet or meters.

  • Storage memory: This should be cleared so a new figure can be saved and/or stored.

  • Dead zone jumper: You must connect this fiber, which should be sufficiently long, between the OTDR and the fiber under test. Sometimes you may have to connect it at the farend of the cable, as well.

Measurement Problems

At times, you will encounter some obstacles you cannot overcome. The following events will put your troubleshooting skills to the test.

  • Nonreflective break: This occurs when a fiber has been shattered or immersed in liquid. In both cases, very little light reflects back to the OTDR, and it’s difficult to identify the break.

  • Gainer: A gainer is a splice in a fiber that shows up as a gain in power. A passive device like a splice cannot generate light and cannot cause a gain in light. But if there is amismatch in the fibers that are spliced, it may appear to the OTDR as a gain. For example, if the splice goes from a 50-micron fiber to a 62.5-micron fiber, the difference in backscatter coefficients (the 62.5-micron core being larger) appears to the OTDR as a gain in light.

  • Ghosts: Ghosts are repetitions of a trace or portion of a trace. They are caused by a large reflection in a short fiber, causing light to bounce back and forth.

Tips for Selecting OTDR

Since OTDRs are very expensive and have only specific uses, the decision to buy one must be made carefully. When selecting the right OTDR, network engineers should make sure the tool has certain functionality, such as loss-length certification, channel/event map view, power meter capabilities, an easy-to-use interface, and smart-remote options. In addition, the OTDR needs to provide a reliable means to document the results. However, if you are not familiar with their operation or cannot understand the results of OTDR tests, it would be much better to hire a specialist to do the testing for you.


ODTRs are valuable fiber optic testers when used properly, but improper use can be misleading and, in our experience, lead to expensive mistakes for the contractor. Once you’re familiar with its limitations and how to overcome them, you’ll be prepared to detect and eliminate your optical fiber events. In a word, if you have an OTDR, it is very important for you to understand how to use it correctly and take good care of it.