What is the maximum distance that an OTDR network tester can measure?

The local network is generally within 5 km! The OTDR of long-distance optical cable is generally within 160km!! Generally, the optical cable will not be so long, too long and too much loss! ~~

Dynamic range is an important one.

OTDR parameters. This parameter reveals the from.

When the backscatter level of an OTDR port drops to a specific noise level.

The maximum optical loss that can be analyzed by the OTDR. In other words, this is the maximum fiber length that the longest pulse can reach. Therefore, the dynamic range (in units) is .

db), the longer the distance it can reach. Obviously, the maximum distance is different in different applications because the loss of the link under test is different. Connectors, splices, and splitters are also lowered.

Factors for the maximum length of the OTDR. Therefore, averaging over a longer period of time and using an appropriate distance range is key to increasing the maximum measurable distance. Most dynamic range specifications are three-minute averages, signal-to-noise ratios using the longest pulse width.

SNR) = 1 (root mean square.

rms) noise value of the average level). Again, it is important to note that it is important to carefully read the detailed test conditions indicated in the footnotes of the specifications.

As a rule of thumb, we recommend choosing a dynamic range that is higher than the maximum loss that may be encountered.

Arrive. db.

otdr。For example, using dynamic range is.

DB of single-mode.

OTDR can meet the dynamic range in.

db around the need. Suppose in.

Typical attenuation for a typical fiber on nm is:

db km, in each.

Welding at kilometers (loss per splice.)

db), such a device can accurately measure the maximum distance.

Kilometer. The maximum distance can be divided using fiber attenuation.

OTDR dynamic range. This helps determine the dynamic range that enables the device to reach the end of the fiber. Keep in mind that the more loss in the network, the greater the dynamic range required. Please note that in.

The specified large dynamic range does not ensure that the dynamic range is also as large at short pulses, and excessive trajectory filtering can artificially inflate the dynamic range of all pulses, leading to undesirable fault finding solutions.

The full name of OTDR is Optical Time Domain Reflectometer.

The test distance needs to be calculated according to the specific module you choose to obtain the maximum distance of the OTDR test in an ideal state. Please provide the module DB range of your OTDR first.

Summary. Hello dear ! Before testing an optical fiber with an OTDR, parameters such as operating wavelength, average time, fiber refractive index, pulse width, and distance range (range) should be set.

Among them: the distance range is generally selected as the multiple of the length of the measured fiber; The pulse width depends on the length of the distance, that is, the long distance uses a wide pulse duration, and the short distance uses a narrow pulse duration; The working wavelength of the OTDR is consistent with the actual working wavelength of the optical fiber; Set the refractive index to be consistent with the actual refractive index of the fiber; If the average time is long, the curve effect is good.

Hello dear ! Before using the OTDR to test the optical fiber, the operating wavelength, average time, fiber refractive index, pulse width, distance range (range) and other parameters should be set. Where:

The distance range is generally selected as a multiple of the length of the measured fiber; The pulse width depends on the length of the distance, that is, the long distance uses a wide pulse duration, and the short distance uses a narrow pulse duration; The working wavelength of the OTDR is consistent with the actual working wavelength of the optical fiber; The refractive index is set to be consistent with the actual refractive index of the optical fiber; If the average time is long, the curve effect is good. I hope it can help you keep an eye on the chaos!

How much pulse width. Pulse width setting: The instrument can choose the pulse width of the slag and the beam has 10ns, 30ns, 100ns, 300ns, 1 s, 10 s and other parameters to choose, the smaller the pulse width, the shorter the sampling distance, the more accurate the test, and vice versa, the longer the test distance.

1. It is made according to the principle of backscattering of light and Fresnel anti-macro slag direction, and uses the backscattered light generated when light propagates in the optical fiber to obtain attenuation information.

2. It can be used to measure optical fiber attenuation, splice loss, optical fiber fault point location and understand the loss distribution of optical fiber along the length, etc., which is an indispensable tool in the construction, maintenance and monitoring of optical cables.

The working principle of the optical fiber tester: through the analysis of the measurement curve, the instrument to understand the uniformity, defects, fractures, joint coupling and other properties of the optical fiber match. Absorbing and reflecting light.

In the fault inspection hall wide test of optical cable, the commonly used equipment is the OTDR optical fiber tester, which is mainly used to measure the transmission characteristics of the optical fiber, which can realize the functions of optical fiber length measurement, event attenuation measurement, fault location, etc., in addition, the domestic OTDR Jilon KL-6200 has another 5 functions: optical power meter, stable light source, red light source, end face detection, network testing, and has only 1m event blind zone. In comparison, the domestic OTDR machine has a small number of arguments that can surpass the KL-6200

OTDR optical fiber tester plays a very large role in the construction and maintenance of optical cables, and the 6200 of Jilong is currently top-notch in terms of accuracy and permeability.

OTDR is optical time domain reflectometer, which is a necessary instrument to measure the characteristics of optical fiber in the construction of communication optical cable engineering and the maintenance of optical cable lines. In addition, optical time domain reflectometers are an important tool for inspecting the integrity of fiber optic cables, which can be used to measure cable length, measure transmission performance and connection attenuation, and detect fault locations in fiber optic cable links. However, with the change of technology, the current optical time domain reflectometer (OTDR) has more functions such as this code, taking the 30-year-old Geelong KL-6200 in my hand as an example, this multi-function optical time domain reflectometer has another 5 functions:

Light source, optical power meter, red light source, endface detection and network monitoring.

The working principle of the optical time domain reflectometer OTDR: in the process of testing the fiber optic cable, the instrument injects a higher power laser or optical pulse from one end of the fiber optic cable and receives the reflected signal through the same side. When the light pulse is transmitted through the fiber optic cable, some of the scattering and reflection are returned to the transmitter.

Optical Time Domain Reflectometry (OTDR) only measures the light signal reflected back with high intensity, records the time from transmission to return of the signal and the speed at which the signal travels through the glass, and then calculates the length of the fiber optic cable using a formula. Compared with power supply and energy meters, which can directly measure the loss of optical cable equipment, OTDR works indirectly, OTDR is made according to the principle of backscattering and Fresnel inverse of light, and uses the backscattered light generated when light propagates in the optical fiber to obtain attenuation information, so as to indirectly measure the loss and fault location of optical cable.

Line monitoring is an important task to ensure the smooth operation of the optical network, and in order to ensure that it is always in good working condition, regular maintenance of the optical cable is required. As the network continues to evolve to a higher transmission rate in the future, the optical time domain reflectometer (OTDR) plays a vital role in ensuring that the optical cable is not frequently replaced during use.

Optical Time Domain Reflectometer (abbreviation: OTDR) is an instrument used to measure the characteristics of optical fibers in the field of telecommunications.

The optical time domain reflectometer injects a series of light surges into the optical fiber for inspection. The test is done by receiving the optical signal from the same side of the incoming wave, because the incoming signal will scatter (Rayleigh scattering) and reflect back when encountering a medium with a different refractive index. The strength of the reflected optical signal is measured and is a function of time and is a signal of time, so it can be converted into the length of the fiber.

The optical time domain reflectometer can be used to measure the length and attenuation of optical fibers, including the fusion and adapter of optical fibers. It can also be used to measure the breakpoint when the fiber is broken.

OTDR can test the length, breakpoint, average loss and other methods of fiber optic cable as follows:

1. Turn on the OTDR power

2. Connect the optical fiber: use alcohol cotton to scrub the pigtail joint and connect the flange of the OTDR 3. OTDR parameter setting: according to the wavelength and refractive index, set the mode selection, wavelength, distance (automatically set first, and then set according to the distance), pulse width, high resolution and test time; •

4. Start-up: After starting the OTDR, the connector cannot be unplugged, and the eye cannot see the end of the optical fiber 5. Data processing: according to different optical cables, test the length of the optical cable, the attenuation coefficient, the average loss, the total loss, the loss and attenuation coefficient of any two points, the loss of the movable joint and the melting point loss, etc., record the measurement data and calculate, in order to reduce the error, two-way measurement is required.

6. Printing of test curves: print out the test curves and analyze the data of the curves. Note:

When the optical cable fails, because the equipment is still emitting light, generally do not use the OTDR test, it should be noted that the equipment and the OTDR emit the same light, which may destroy the equipment or the OTDR, but use the optical power meter to test. Topography OTDR has the function of automatic monitoring of the communication optical signal in the optical fiber under test, and once the monitoring has optical information access to the instrument, it will give an alarm prompt, which can provide the fastest and most timely protection for the instrument and equipment.

Hello, glad to answer for you, when using a 200m fiber optic cable for OTDR testing, you need to set up as follows: confirm that the wavelength of the OTDR is the same as that of the test fiber, usually 1310nm or 1550nm. The OTDR test distance range is set to be greater than the actual length of the cable to ensure complete detection of signal reflection and attenuation.

Set the start and end points so that the OTDR can take measurements over a specific distance range. Confirm that the test fiber connection is stable and eliminate any stray signals (e.g. Hutanhe lamp suction, environmental noise, etc.). For long-distance cable testing, a gain regulator can be used to improve the accuracy of the OTDR.

1. Test wavelength: set to the window of 850 (provided you have this working wavelength).

2. Test range: set to 0-10km, test range = actual test distance * 3 pulse width: the farther the measurement distance is set, the larger the value, this principle.

Generally, the attenuation blind area of the OTDR is a few meters, and the event blind area is more than ten meters, which roughly means that there are several meters of optical fiber from the starting point, which is unmeasurable, and this distance is called the blind zone.

Therefore, there is no need to add a 1000m auxiliary test fiber. Unless you're going to measure fiber over short distances of nearly 100m.

If you have any questions, you can email me, or add q:532718734

If you use multi-mode to transmit a distance of 3km, the inherent loss of multi-mode optical fiber is pressed, 3km, that is, the optical signal loss is about 80%, plus the loss of the coupling, there is no point in transmission, personal understanding, mutual communication.

850nm is a multi-mode fiber, and the attenuation of a general multi-mode fiber is 3db 1000m, so if you are 3 km, it is 9dbThe signal is attenuated by half at 3db, and now that you're attenuating, you're adding a 3dbI guess I can't measure anything.

First of all, your OTDR must have an 850nm test module (typical OTDRs only have 1310 and 1550nm).

Secondly, the addition of about 1000m auxiliary fiber is only to be able to measure the part of the OTDR dead zone in front of the 3000m fiber optic cable.

Again, what fiber optic cable and what signal can't transmit 3000m at 850nm, right? You can't get the wavelength wrong?