Maya Ellison
Plastic optical fiber (POF) or polymer optical fiber is an optical fiber made out of polymer. It is a highly promising transmission medium for future home networking. Plastic optical fiber is also known as graded plastic optical fiber or graded-index polymer optical fiber (GIPOF) when it is of the graded index (GI) type. The graded index type is one of the two types of optical fibers, the other being the step index (SI) type. The GI type has a higher transmission capacity than the SI type. Graded plastic optical fiber offers advantages such as great flexibility and easy handling compared to glass optical fibers.
| Characteristics | Values |
|---|---|
| Composition | Polymer, usually Poly(Methyl MethylAcrylate) (PMMA) |
| Core Material | Acrylic polymer PMMA |
| Cladding Material | Fluorinated polymers |
| Core Diameter | 1mm |
| Attenuation Loss | About 1 dB/m @ 650 nm |
| Bandwidth | ~5 MHz-km @ 650 nm |
| Applications | Telecommunications, home networking, industrial light guides, short-distance data transmission, remote sensing, multiplexing, textile manufacturing |
| Advantages | Low cost, flexibility, ease of installation and maintenance, robustness under bending and stretching, insensitive to electromagnetic radiation, no heat generation |
| Disadvantages | Difficult to create fusion splices with acceptable attenuation, mechanical damage causes signal loss |
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What You'll Learn
Plastic optical fiber's advantages
Plastic optical fiber (POF) or polymer optical fiber is an optical fiber made out of polymer. It is similar to glass optical fiber in that it transmits light (for illumination or data) through the core of the fiber. However, POF has several advantages over glass fiber:
Ease of Installation and Maintenance
POF is easier to install and maintain than glass fiber, making it a lower-cost solution for short-distance links. This is because POF can be installed by untrained personnel and even home users, whereas glass fiber requires highly trained technicians. The tools and equipment for glass fiber termination are also typically expensive.
Flexibility and Handling
POF offers greater flexibility and is easier to handle than glass fiber due to its larger diameter and the flexibility of the material. This makes POF attractive for shorter distances.
Robustness
POF is more robust than glass fiber under bending and stretching. It can be bent further without breakage and has a larger core diameter, making it less susceptible to damage during manufacturing and use.
Safety
POF does not generate heat and is insensitive to electromagnetic (EM) radiation, making it safer to use in various applications, including textiles.
Cost
The materials used for POF are low-cost, and the installation with associated assemblies is not expensive. In addition, plastic or polymer materials are being used to replace metal and ceramic components in optical fiber connectors, reducing costs and improving electromagnetic radiation susceptibility.
Applications
POF has a wide range of applications, including in home networking, remote sensing, multiplexing, and textiles. It is also suitable for low-speed, short-distance applications in digital home appliances, industrial networks, car networks, and illumination.
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Applications of plastic optical fiber
Plastic optical fiber (POF) is a highly flexible, cost-effective alternative to glass optical fiber. Its chief advantages are its robustness under bending and stretching, ease of installation, and suitability for short-distance data transmission.
POF is commonly used for low-speed, short-distance applications in digital home appliances, home networks, industrial networks, and car networks. In the home, POF is expected to be used for next-generation Gigabit/s links. In the automotive industry, POF is increasingly used in vehicles for communication and sensor networks, including entertainment systems, dashboard displays, and in-car communication systems.
POF is also used for illumination applications, such as fiber optic Christmas trees, and for low-speed data transmission in Hi-Fi systems. Its large core diameter and high numerical aperture make it beneficial when light-emitting diodes are used as data transmitters.
POF is further used in industrial control systems, where its low cost, ease of installation, and suitability for short-distance transmission are advantageous.
Polymer optical fibers can be used for remote sensing and multiplexing due to their low cost and high resistance. They can be easily integrated into textiles, transmitting data signals, transmitting light for optical sensing, detecting deformations in fabrics, and performing chemical sensing.
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Plastic optical fiber vs. glass optical fiber
Plastic optical fiber (POF) and glass optical fiber (GOF) are the two primary types of fiber optic cables, each with distinct characteristics, advantages, and limitations.
Plastic optical fiber is made from polymer materials, usually polymethyl methacrylate (PMMA), and sometimes other plastics. POF has a thicker core compared to GOF, which allows for easier light propagation but limits its transmission range. Plastic fiber is also more flexible and robust under bending and stretching. It is less expensive and less complex to install and maintain, making it a cost-effective solution for short-distance, low-speed data transmission applications. Examples of POF applications include home networking, in-vehicle communications, and industrial automation systems.
On the other hand, glass optical fiber is made from extremely pure silica glass and exhibits superior performance in terms of data transmission speed and distance. Glass fiber has a higher refractive index, enabling it to carry more data with minimal signal loss, even over long distances. It also has higher temperature resistance, making it suitable for harsh environments. However, glass fiber requires special equipment and highly trained technicians for installation and maintenance, resulting in higher costs. GOF is ideal for high-performance applications such as long-haul telecommunications, internet backbone infrastructure, and undersea cables.
In summary, the choice between plastic and glass optical fiber depends on the specific application requirements. POF is suitable for short-distance, low-cost applications, while GOF is preferred for long-distance, high-performance, and high-reliability transmissions.
Graded plastic optical fiber is a type of plastic optical fiber that has been enhanced to improve transmission speeds. Graded-index polymer optical fibers (GIPOF) have been developed to achieve higher transmission speeds over POF. GIPOF offers superior performance over traditional POF, with a world record of 2.5 Gbit/s transmission speed set in 1999. Graded-index fibers have larger core diameters, improving light propagation and flexibility, making them attractive for short-distance applications.
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Graded index MMF
Graded index multimode fiber (GI-MMF) is a type of optical fiber where the refractive index is higher at the axis of the core and then gradually decreases toward the core-cladding interface. This means that the refractive index of a graded-index fiber gradually decreases from its center, eventually reaching the same value as the cladding at the core edge. This change in refractive index causes refraction rather than total internal reflection. When light passes through a layer with a a lower refractive index, it will fold back to the fiber axis.
The speed of light propagation in graded-index multimode fibers is different because the speed of guided light varies with the refractive index of the fiber core. The farther the light goes from the center of the fiber, the faster its speed. This speed difference compensates for the longer paths followed by the light rays that travel farthest from the center of the fiber. This equalization of transmission time for different modes reduces mode dispersion, allowing graded-index fiber to achieve a higher bandwidth than step-index fiber.
Graded-index multimode fibers provide improved transmission rates and are available with different bandwidth options. They are particularly well-suited for use in telecom applications, where the bandwidth is optimized for high-performance 850 nm laser systems. They can also be used with LEDs at 850 nm or 1300 nm, although this will result in a reduced bandwidth.
Graded-index multimode fibers have an operating temperature range of -20°C to +80°C, with a 250 µm acrylate buffer coating. This allows for continuous operation in an extended temperature range of -65°C to +135°C. Graded-index multimode fibers are typically used in medium-distance (10-20 km) and relatively higher-speed (34-140 Mb/s) communication systems. They are also used in short-range communication networks and high-speed transmission applications.
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Graded index polymer optical fiber's pioneers
Plastic optical fiber (POF) or graded index polymer optical fiber is a type of optical fiber made out of polymer. It is similar to glass optical fiber in that it transmits light (for illumination or data) through the core of the fiber. However, POF has the advantage of being more robust under bending and stretching.
Giok Djan Khoe at Eindhoven University of Technology and Yasuhiro Koike, a polymer scientist at Keio University, are pioneers in high transmission speed over graded index polymer optical fibers (GIPOF). In 1999, they set a world record of 2.5 Gbit/s and demonstrated in 2001 that Gigabit transmission and transmission with Wavelength-Division Multiplexing are possible. GIPOF is easier to handle and has a larger diameter and more flexibility, making it attractive for shorter distances.
The development of graded index polymer optical fibers has been influenced by various authors and researchers. Mark Kuzyk, in 'Polymer Fiber Optics', writes in detail about the theory of light propagation, while Maryanne Large and Frederic Zolla present the application of microstructuring processes in polymers in 'Microstructured Polymer Optical Fibres' and 'Photonic Crystal Fibres', respectively.
In addition, Mohamed Atef's book, 'Optical Communication Over Plastic Optical Fibers: Integrated Optical Receiver', and Yasuhiro Koike's book, 'Fundamentals of Plastic Optical Fibers', provide insights into the field. The development of graded index polymer optical fibers has also been influenced by research projects such as POF-ALL and POF-PLUS, which aim to explore the potential of POF for high-speed home networking applications.
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Frequently asked questions
Graded plastic optical fiber (GIPOF) is a type of polymer optical fiber (POF) that has a graded index profile. This means that the core of the fiber has a varying refractive index, which allows for the transmission of light and data at high speeds over short distances.
Graded plastic optical fiber offers several advantages over other types of optical fibers, such as glass fiber. It is flexible, easy to handle, and has a larger diameter, making it more suitable for shorter distances. Graded plastic optical fiber is also less expensive and easier to install and maintain, making it a popular choice for home and office networking applications.
Graded plastic optical fiber offers improved transmission characteristics compared to step-index plastic optical fiber. It provides higher bandwidths and better attenuation performance, making it suitable for higher-speed applications. However, step-index fiber is currently the only commercial product available.
Graded plastic optical fiber is well-suited for short-distance applications, such as home networking, industrial networks, car networks, and data center wiring. It is also being considered for next-generation Gigabit/s links inside homes due to its potential for high-speed data transmission. Additionally, graded plastic optical fiber can be woven into textiles for aesthetic purposes, safety applications, or data transmission.
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