OTDR length

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At which wavelength OTDR will report very accurate length of optical fiber / cable

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1625nm

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At 1310 nanometers OTDRs give accurate optical length. Hence for field measurements 1310 nm wavelength is used to measure fiber length. Accurate fiber length is important to estimate physical cable length correctly that are used in trouble shooting especially in case of fiber break.

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please explain me how 1625nm is more accurate

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