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

Masataka Nakazawa, Takashi Nakashima, Shigeyuki Seikai

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


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 μm, 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 μm. Wavelength and polarization dependences of the LD's as photodetectors were also investigated. No polarization dependence was observed.

Original languageEnglish
Pages (from-to)157-159
Number of pages3
JournalOptics Letters
Issue number3
Publication statusPublished - 1985
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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