Nondestructive Evaluation of Coupling Constants in Singlemode Optical Thannel Waveguides

Makoto Tsubokawa, Mitsuhiro Tateda, Nori Shibata, Masao Kawachi

Research output: Contribution to journalArticlepeer-review


A nondestructive method is proposed for evaluating power coupling coefficients at directional couplers contained in an optical integrated circuit. This technique, which is based on optical heterodyne interferometry, makes it possible to obtain individual coupler element information without removing the element from the optical circuit. General N-channel waveguide coupling characteristics are analyzed, and they are experimentally evaluated for two-and four-channel waveguides that have been practically designed as frequency multi/demultiplexers operating in the 1.55-μm-wavelength region.

Original languageEnglish
Pages (from-to)1209-1216
Number of pages8
JournalJournal of Lightwave Technology
Issue number7
Publication statusPublished - 1988 Jul
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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