What is the use of launch cable in OTDR?
What is the use of launch cable in OTDR?
The launch cable allows the OTDR trace to settle down after the test pulse is sent into the fiber so you can analyze the beginning of the cable you are testing.
What is a launch cable used for?
OTDR Launch Cables are designed to be used in conjunction with an OTDR to measure complete link loss of a fiber. They are also known as pulse suppressor cables, launch cords, launch leads, receive cables or fiber rings.
When using an OTDR The launch fiber must be the same as the fiber to be tested?
OTDR Testing With Launch and Receive Cable For very long haul, 4000 m of cable may be used. The larger the pulse width, the longer the launch cable and receive cables. Always notice that launch and receive cables must be the same type as the fiber under test.
Which wavelength is recommended for OTDR testing?
Generally speaking, 1625 nm is the preferred wavelength for monitoring legacy 1310/1550-nm systems, largely due to laser cost. The 1650-nm wavelength is recommended for CWDM, DWDM, XGS-PON, and TWDM-PON systems where the traffic wavelengths extend into the L-Band.
How far can an OTDR test?
Assuming typical fiber attenuation of 0.20 dB/km at 1550 nm and splices every 2 km (loss of 0.1 dB per splice), a unit such as this one will be able to accurately certify distances of up to 120 km.
What does OTDR measure?
The OTDR measures distance and loss between the two markers. This can be used for measuring loss of a length of fiber, where the OTDR will calculate the attenuation coefficient of the fiber, or the loss of a connector or splice.
How should you connect the OTDR to the fiber optic cable?
Test Procedure
- Turn on OTDR and allow time to warm-up.
- Clean all connectors and mating adapters.
- Attach launch cable to OTDR. Attach receive cable (if used) to far end of cable.
- Set up test parameters on OTDR.
- Attach cable to test to end of launch cable. Attach receive cable (if used) to far end of cable.
- Acquire trace.
What is the distance range of OTDR?
Dynamic Range
| Wavelength | 1310 nm | 1550 nm |
|---|---|---|
| Dynamic Range | 35 dB | 40 dB |
| Typical maximum OTDR measurement range | 80 km | 150 km |
How do you perform an OTDR test?
What are the applications of OTDR?
The Applications and Basic Settings of OTDR
- OTDR can be used for return loss measurements, although quoted accuracy is not particularly high.
- OTDR is useful for testing fiber optic cables.
- OTDR is also widely used for optical cable maintenance and construction.
Which diode is used in OTDR?
60mw-80mw 1310nm Pulse Laser Diode. It is widely used in OTDR system.
Why do you need OTDR launch box?
An OTDR can test the light loss and locate the breaks, splices and connectors in fiber optic network. However, an OTDR has a “Dead Zone” which can affect the test results. To overcome the limitation of this OTDR dead zone , an OTDR Launch Box is used.
What should you know before using an OTDR?
Using an OTDR to Certify New Links. The health of your network depends on the quality of your network infrastructure.
What is OTDR and how does it work?
Optical Time Domain Reflectometer (OTDR) which is a measurement device that works indirectly on the fibre optic cables. It measures losses of data and finds faults in the optic cable.
What is OTDR testing?
The Optical Time Domain Reflectometer (OTDR) is useful for testing the integrity of fiber optic cables. It can verify splice loss, measure length and find faults. The OTDR is also commonly used to create a “picture” of fiber optic cable when it is newly installed.
