Low radiation loss branching/combining of optical circuits using high-silica channel waveguides

• Published in: Journal of lightwave technology Vol. 4; no. 12; pp. 1732 - 1735
• Main Authors: Shin Sumida, Magari, K., Kawachi, M.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 1986; Institute of Electrical and Electronics Engineers
• Subjects: Applied sciences; Circuit properties; Circuits; Electric, optical and optoelectronic circuits; Electronics; Exact sciences and technology; Miscellaneous; Optical and optoelectronic circuits; Optical buffering; Optical devices; Optical films; Optical filters; Optical losses; Optical refraction; Optical surface waves; Optical waveguides; Wavelength division multiplexing; Combiner circuit; Integrated optics; Branching; Optical multiplexer; Channel waveguide; Wavelength division multiplexing; Optical waveguide; Demultiplexer
• ISSN: 0733-8724; 1558-2213
• DOI: 10.1109/JLT.1986.1074682

A new branching/combining optical circuit structure using high-silica channel waveguides was proposed to reduce radiation loss where branching occurs. In this structure, an additional low-refractive-index layer was formed at the junction surface between the main and branching channels. The loss in a conventional circuit could be successfully reduced by over 0.4 dB in the through channel and 0.1 dB in the reflecting channel. The allowable conditions for a low-refractive-index layer were obtained through experimental and theoretical studies.