Fiber-Optic Sensor Using an Injection-Locked Local Laser

Haruo Okamura, Katsumi Iwatsuki

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


An interferometric fiber-optic sensor using a local laser is proposed. An Er-doped-fiber ring-laser is injection locked to a signal carrier using a fiber coupler and the extracted carrier is directly homodyned with the signal light at the output of the coupler. With a feedback loop suppressing the local laser instability, demodulation linearity over 2 decades and minimum detection in the 10-3 rad range are attained. The Er-doped fiber ring laser constructed for this work has a linewidth of less than 1.4 kHz.

Original languageEnglish
Pages (from-to)552-557
Number of pages6
JournalJournal of Lightwave Technology
Issue number4
Publication statusPublished - 1991 Apr
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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