COURSE 8
AN INTRODUCTION TO PLASTIC OPTICAL FIBERS
Yucatan 2
Instructor: Dr. Ramakrishnaiyer Raman
Consultant
Tucker, Georgia
DESCRIPTION
Plastic Optical Fiber, or POF is essentially a "fat" polymeric analogue of glass waveguides, both in terms of design as well as light transmission. Indeed each technological advance such as Single Mode Fiber, amplifier, or photonic switching has produced a plastic twin, the market driver being its low cost. This course is a detailed introduction to an exciting subject that has become increasingly important in short-distance telecommunications, specifically IEEE 1394 applications.
In contrast to multi-mode glass fibers having 50 to 200 micron core diameter, POF comes with larger core diameter, typically 1000-3000 microns. One difference between POF and glass fiber is its high attenuation, 180 to 400 dB/km. However, for shorter distances it poses less of a problem.
Of importance to all applications is the optical transparency offered by materials such as Polymethyl Methacrylate (PMMA) which is the backbone of all POF technology, the same PMMA that is used in CD players and contact lenses. The bulk of the applications of POF, either in the form of tubes or bundles is in the area of illumination, signs, and displays. POF containing dyes and dopants are used as sensors for measuring temperature, position, pH radiation, etc. Medical applications include laser guides for surgery, baby protective coils, and flexible diagnostic probes.
In recent years, there is a tremendous upsurge of interest in using POF for short distance communications. The fact that Asahi Glass has demonstrated the feasibility of transmitting 1 Gb/s over 500 meters of POF, has certainly given POF technology a big boost. Applications such as fiber to the desk-top, fiber to the home, internet, aircraft entertainment networks to the seat, and automotive networks are all LAN, but highly connector-intensive and is, overwhelmingly copper-based. This is an area where glass has failed to penetrate, but where POF has broken the barrier. The big advantage is that POF is flexible, eliminates stress fracture (unlike glass), easy to handle, easy to couple, and can operate at short wavelengths (visible region), and at the same time inexpensive.
This course is divided into four parts: Part I will focus on POF basics, core, cladding materials, fundamental chemistry, manufacturing, transmission characteristics, end preparation, connectivity, and opto-electronics. Part II will consist of applications, POF grades, loss factors, performance enhancement, mechanical properties, and LAN systems. Part III will cover high-speed data transmission, Graded Index fiber, application space, aging, new bend requirements and recent advances. Part IV will highlight Standards, market, business issues, industry trends and information resources followed by concluding remarks.
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