Side-tone OTDR for in-service optical cable monitoring

Details Side-tone OTDR for in-service optical cable monitoring Side-tone OTDR for in-service optical cable monitoring

1996-10-10

1999-07-20

McGraw, Vincent P.

Optics: measuring and testing

For optical fiber or waveguide inspection

G01N 2188

Patent

active

059262630

ABSTRACT:
An OTDR provides both in-service and out-of-service measurement information for an optical transmission system with multiple repeaters. The repeaters include an optical high-loss loop back (HLLB) path and an OTDR path. The OTDR is coupled to the input lines of the optical transmission system via an optical coupler so that both traffic signals and test signals from the OTDR can be transmitted simultaneously. When the OTDR is providing in-service measurement information, test signals in the form of side-tone pulses are transmitted on the transmission system. The wavelengths of the test signals are sufficiently offset from the wavelength of the traffic signal so there is minimal interference between them. The level of the test signals is low relative to the traffic signal to also minimize interference. The OTDR filters out the traffic signal from the returned signal. The HLLB path through the amplifier pairs of each repeater is distinguishable in the filtered returned signal. When the OTDR is providing out-of-service measurement information, the level of the side-tone pulses is increased because interference with traffic signal is no longer a concern. Both the HLLB path and the OTDR path are distinguishable in the filtered returned signal when the higher level out-of-service test pulses are transmitted.

REFERENCES:
patent: 3981592 (1976-09-01), Williams
patent: 4212537 (1980-07-01), Golob et al.
patent: 5436746 (1995-07-01), Hirst

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