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Opt Lett. 1985 Mar 1;10(3):157-8.

Self-detecting optical-time-domain reflectometer for single-mode fibers.


A new type of optical-time-domain reflectometer (OTDR) has been demonstrated. It uses a semiconductor laser diode (LD) as both a pulse emitter and a photodetector. With a LD operating at 1.31 microm, a fault-location length for a single-mode optical fiber of about 20 km has been achieved by extrapolating the log-transformed OTDR slope to the background-noise level. This length has been extended to 25 km at a wavelength of 1.56 microm. Wavelength and polarization dependences of the LD's as photodetectors were also investigated. No polarization dependence was observed.

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