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Panel session on single-polarization single-mode (SPSM) optical fibers ? a sketch report

✍ Scribed by Snyder, Allan W.

Publisher
Springer
Year
1984
Tongue
English
Weight
142 KB
Volume
41
Category
Article
ISSN
0003-6994

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✦ Synopsis

Professor Snyder, organizer of the Panel, opened the Session and introduced the subject. He said that the subject of SPSM fibers is very fascinating, and of great current interest. In the special issue of the Journal of IEEE on QE of last April, there were three invited papers on this subject, by Kaminow, Okoshi, and Payne, respectively. Each of them is here today, together with many other workers. It is indeed very interesting to get the latest views on this subject. Our discussion will focus on basic ideas and concepts, not going into the details of mathematics.

Dr. Payne, as an initial speaker, talked about the need for single polarized fibers in sensors and/or communication systems. He pointed out that, currently, there are two approaches to produce SPSM fibersthe structural and the material approach. The structural (or geometrical) approach uses asymmetrical structure -the side-pit or side-tunnel structure, in which one of the polarized modes is cut off. On the other hand, the material approach uses birefringent material to form the waveguide. Due to the anisotropy of the effective index, one of the polarized modes will become leaky, so only one polarized mode will transmit along the waveguide. Dr. Payne explained the scheme they adopted to fabricate SPSM fibers. The fiber has a bow-tie structure, which combines the W-profile with the stress-induced birefringence. The fabrication process uses MCVD method. They deposit buffer and stressed layers first, then deposit clad and core, and finally the tube collapses into a preform. The process is much simpler than that of fabricating panda-structure fibers reported by Japanese workers. Dr. Payne also talked about the measurement of the fiber characteristics. Extinction ratios higher than 50 dB have

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