GAO Tek’s OTDRs are used in the field of fiber optics for testing and troubleshooting fiber optic cables. OTDR stands for Optical Time Domain Reflectometer.  OTDRs are designed to measure the characteristics of optical fibers, such as length, attenuation, and reflections. The main function of an OTDR is to send a short pulse of light into a fiber optic cable and analyze the reflected and scattered light that returns. This enables the OTDR to provide information about the fiber’s length, loss, and the locations of any faults or anomalies along the cable.

GAO’S OTDRs are composed of a laser source, coupler/splitter, optical circulator, photodetector, time measurement system, display, and control panel.

The other common names of OTDRs are OTDR devices, reflectometer units, fiber optic testers, optical cable analyzers, time-domain reflectometer tools, reflectometry systems, optical signal analyzers, fiber optic diagnostic equipment, cable testing instruments, reflective pulse analyzers, light pulse reflectors, fiber testing devices, optical reflection analyzers, pulse-echo testers, and time-of-flight analyzers.

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GAOTek Fiber Optic Equipment Multifunction FTTR MINI OTDR

GAOTek Fiber Optic Equipment Multifunction FTTR MINI OTDR is used to measure the length, loss, splice quality, and other parameters of various types of optical fiber and optical cable and is widely used in the fields of engineering construction, line maintenance, and emergency rescue testing of optical fiber to the home, metropolitan networks, and secondary backbone communication systems, as well as in the development and production measurement of optical fiber and optical cable.

GAOTek Fiber Optic Equipment Test Machine Mini OTDR

GAOTek Fiber Optic Equipment Test Machine Mini OTDR combine 9 functions with highly integrated OTDR, Event maps, Stable Light source, Optical power meter, Visual fault locator, cable sequence proofreading, cable length measurement and lighting functions.

GAOTek Fiber Optic Equipment Test Machine Mini OTDR

Features Auto OTDR, expert OTDR, event map, OPM, Light Source, VFL, Lan cable tracker (Including line finder), Lan cable sequence,

GAOTek Fiber Optic Mini smart Handheld OTDR for Broadband Fiber Installation

GAOTek fiber optic mini smart handheld OTDR for broadband fiber installation is a unique mainly designed for construction and maintenance of telecommunication and CATV networks.

GAOTek Fiber Optic Tester Reflectometer

This Enterprise Fiber Optic Tester Reflectometer has a 20 dB dynamic range, 39.37 ft (12 m) Attenuation Dead Zone, and 9.8 ft (<3 m) event dead zone.

GAOTek Fiber Optic Testing Instruments


GAOTek Fiber Optic Testing Instruments: 7" touch screen, dual battery, water-resistant, USB/SD data export, and auto light detection for efficient testing.

GAOTek Fiber Optical SM or MM or PON OTDR

GAOTek Fiber Optical SM or MM or PON OTDR have a 5.7''scontrol and a fiber inspection probe with optional built in OLTS function (light source and power meter), PING test function, and visual fault locator.

GAOTek Fiber Optical SM/MM/PON OTDR

Features Humanized OTDR software provides detailed test reports Waveform display, fast zoom through event points Silicone buttons, dust-proof, cover for

GAOTek Handheld Mini Optical Time Domain Reflectometer

GAOTek handheld mini optical time domain reflectometer is apply to FTTx and access network construction and maintenance, to test fiber breakpoint, length, loss and input light automatic detection, automatic test by one key.

GAOTek Handheld Mini OTDR Fiber Optic OPM VFL

Ensure precise fiber testing with GAOTek Handheld Mini OTDR. Offering a testing range of 0.06 mi to 49.7 mi, equipped with FC/SC ports, high sampling resolution, and a 4.3" touch screen. Explore its accuracy with versatile accessories.

GAOTek Handheld Smart Mini Pro Multifunction OTDR with Event Map

GAOTek Handheld Smart Mini Pro Multifunction OTDR with Event Map combine 9 functions with highly integrated OTDR, Event maps, Stable Light source, Optical power meter, Visual fault locator, cable sequence proofreading, cable length measurement and lighting functions.

GAOTek High Precision

This Enterprise High Precision OTDR has 328.1 ft (100 m) minimum distance, 19.7 ft (<6 m) attenuation DZ, and 1.6 ft (0.05 m) distance resolution.


GAOTek MaxTester MAX-730C OTDR EXFO is the first tablet inspired OTDR line that is handy, lightweight and rugged enough for any outside plant environment.

GAOTek Mini Fiber Optic OTDR Tester

This Mini Fiber Optic OTDR Tester offers 1310/1550 nm wavelength, 28/26 dB dynamic range. Compact size, 5-inch color LCD + touch Screen. USB data interface.

GAOTek Mini Fiber Optic OTDR with One-Key Operation

GAOTek Mini Fiber Optic OTDR with One-Key Operation tester is developed and designed by adopting a single wavelength 1625 nm, based on the full understanding of FTTH network, it replaces the PON OTDR with multi-wavelength in one (1310 or 1550 or 1625) on the market, reduces purchase and operation costs, completely meets the demand of rapid troubleshooting from end users during maintenance work.

GAOTek Mini Fiber Optic Tester Exfo Reflectometer

This Enterprise Mini Fiber Optic Tester EXFO Reflectometer has 0.20 dB loss threshold, 8.2 ft (2.5 m) event blind zone, and 26.25 ft (8 m) ATT Blind Zone.

GAOTek Mini Handheld Measure Test OTDR

GAOTek mini handheld measure test OTDRs feature a 3.5 in (88.9 mm) color screen, double operation of keys and touch.

GAOTek MINI OTDR Event Dead Zone

Optimize FTTX networks with GAOTek MINI OTDR. Equipped with Bluetooth & Wi-Fi, operating at 1310/1550 nm wavelengths for G652 fiber. Exceptional 1.6 ft event dead zone performance.

GAOTek Mini OTDR Machine

This Enterprise Mini OTDR Machine has a 1.0000 to 2.0000 index of refration, 3.7 V 2400 mAh Lithium Battery, and -50 dB to +26 dB testing range.

GAOTek Mini OTDR Power Meter

This OTDR Power Meter  is designed for FTTX, dynamic range of 34dB, distance range up to 99.4 mi, accurate loss measurement.

GAOTek Mini OTDR tester

GAOTek mini OTDR tester is a new generation of intelligent optical measuring instrument designed for the optical fiber communication system testing.

GAOTek Mini Time Domain Reflectometer

This Enterprise Mini time Domain Reflectometer has a 9.8 ft (3 m) event dead zone, 1310 nm wavelength, and 26.25 ft (8 m) attenuation dead zone.

GAOTek Multi-Functional Fiber Optic Reflector

GAOTek multi-functional fiber optic reflectors OTDRs adopt 3.5 in color screens.

GAOTek Multifunction Optical Time Domain Reflectometer with VFL Light

GAOTek multifunction optical time domain reflectometer with VFL Light is a new generation of portable and intelligent measuring instrument for testing optical fiber communication system.

GAO’s OTDRs have the following functions:

  • Distance Measurement: GAO’s OTDRs can accurately measure the length of a fiber optic cable by analyzing the time it takes for the light pulse to travel through the fiber and return. This helps in determining the physical distance between two points in the cable.
  • Loss Measurement: Our OTDRs measure the signal loss (attenuation) along the fiber optic cable by analyzing the strength of the reflected or backscattered light. This allows technicians to identify areas of excessive loss and pinpoint the locations of splices, connectors, or breaks that may be causing the loss.
  • Fault Localization: GAO’s OTDRs are used to locate faults or anomalies in fiber optic cables, such as breaks, bends, or high loss points. By analyzing the differences in reflection or backscatter patterns, technicians can identify the exact locations of these faults and plan for necessary repairs or replacements.
  • Reflectance Measurement: Our OTDRs can detect and measure the amount of light reflected at different points in the fiber optic cable. This reflection measurement helps in evaluating the quality of connectors, splices, and other components by assessing their ability to minimize signal reflections.
  • Fiber Characterization: Our OTDRs provide information about the overall quality and performance of fiber optic cables. They can assess parameters such as fiber attenuation, splice and connector loss, and fiber uniformity, helping technicians evaluate the suitability of the fiber for specific applications.

GAO Tek’s OTDRs are rugged, versatile, and precision measurement instruments. They comply with applicable industry standards such as IEC 61010, IEC 60529, TIA-568, ANSI/TIA-1096-A, and MIL-STD-1344.

GAO Tek’s OTDRs help our customers comply with relevant U.S. government regulations such as:

  • FCC (Federal Communications Commission).
  • National Electrical Code (NEC).
  • Restriction of Hazardous Substances (RoHS) Directive.
  • Occupational Safety and Health Administration (OSHA) Standards.
  • Defense Federal Acquisition Regulation Supplement (DFARS).

GAO Tek’s OTDRs help our clients in complying with relevant Canadian government regulations such as:

  • Canadian Electrical Code (CEC).
  • Health Canada Regulations.
  • Canadian Radio-television and Telecommunications Commission (CRTC) Regulations.

GAO's OTDRs have the following applications:

  • Fiber Optic Network Installation: GAOTek’s OTDRs are used during the installation of fiber optic networks. They help technicians verify the integrity and quality of the installed fiber optic cables, ensuring that they meet the required specifications and performance standards.
  • Fault Location and Troubleshooting: When there are issues with fiber optic cables, our OTDRs are used in locating and troubleshooting faults. By analyzing the backscattered or reflected light, technicians can pinpoint the exact location of breaks, bends, or other faults in the cable.
  • Fiber Optic Link Characterization: GAO’s OTDRs provide valuable information about the characteristics of fiber optic links. They can measure parameters such as fiber attenuation, splice loss, and connector loss, helping technicians assess the overall quality and performance of the link.
  • Fiber Optic Cable Testing and Certification: GAOTek’s OTDRs are used for testing and certifying newly installed fiber optic cables. They measure the length of the cable, identify any excessive losses or reflections, and ensure that the cable meets the required performance standards.
  • Fiber Optic Link Monitoring: Our OTDRs can be used for continuous monitoring of fiber optic links to detect any degradation or changes in performance over time. This helps in proactive maintenance and ensures the reliable operation of the network.

Our OTDRs can be shipped overnight within the continental U.S. and Canada, and can be shipped globally.