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There are many different kinds of fiber optic cables and they are optimized for different applications. For example, an optical fiber used for long distance transmission.

But it is the ability to transmit light from a source to a specific location that continues to evolve. And because of this never-ending progress, we decided to take you on a tour into the world of fiber optic lighting.

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In 1854, John Tyndall demonstrated to the Royal Society that light could be guided through a curved stream of water.  His famous experiment was the first official demonstration of TIR, although he had no explanation for why this phenomenon was occurring. [source]

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In the paper, he proposed that if someone could create fiber with an attenuation reduced below 20 decibels per kilometer (dB/km), that would enable long-term communication. They correctly and systematically theorized the light-loss parameters needed to create such fibers and Kao was awarded the Nobel Prize in Physics in 2009 for this discovery.

That same year, Harold Hopkins and Narinder Kapany at Imperial College in London succeeded in making image-transmitting bundles with over 10,000 fibers and subsequently achieved image transmission through a 75 cm long bundle which combined several thousand fibers. Kapany went on to coin the term “fiber optic” and is considered the “Father of Fiber Optics.”

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An interesting application of this technology was discovered by the medical team of Roth and Reuss of Vienna who used a bent glass rod to illuminate body cavities in 1888. It was used to illuminate the larynx, nose, and even some ophthalmological surgeries. This is something that Lumitex has perfected and now manufactures in-cavity instrumentation lighting for many surgical applications.

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Long distance cables for communication usually run underwater can be up to 10,000 km in length. Over that distance, signal quality is extremely important and they typically have multiple cores and more layers for protection.

Three years later in 1973, Bell Laboratories developed a modified chemical vapor deposition process that heats chemical vapors and oxygen to form ultra-transparent glass that can be mass-produced into low-loss optical fiber. This process still remains the standard for fiber optic cable manufacturing and was a significant contribution which led to fiber optic adoption.

They are an important component used in advanced telecommunications, imaging, medicine, and robotic vision. But they can also be found in mundane things such as kids' toys and Christmas trees.

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To overcome this, a coating is added over the core with a lower index of refection (RI) than the core. This is called cladding. When the light is traveling through the core of the optical fiber and encounters the lower RI cladding, it will TIR and continue to transmit through the core. This cladding layer is what makes a light guide a fiber optic.

If you had a light guide, imagine an acrylic rod, which has a refractive index of 1.49, and you coupled a laser to one end, the light would continue to propagate through the rod as long as the angle is greater than the critical angle.

In 1970, A team of researchers from Corning Glass invented fiber optic wire or "Optical Waveguide Fibers" (patent #3,711,262) by experimenting with fused silica. They were able to solve the challenges presented by Kao and created a fiber that could carry light waves to a destination a thousand miles away.

At Lumitex, we counteract this process by using proprietary processing techniques to cause the fiber optics to emit light in a controlled manner.

In theory, in a perfect vacuum with no scattering/reflectance loss of light would continue to propagate to infinity and beyond. However, in reality, if anyone was to touch the light guide or if it was to come into contact with any other materials it could cause the light to unpredictably escape. This makes acrylic light guides good for short distances or to demonstrate TIR but not for long-distance communication or other technical applications where signal quality is important.

Alberti said, “Each atom acts like a small sensor that records the intensity of the beam. By examining thousands of atoms at different locations, we can determine the location of the beam to within a few thousandths of a millimeter.”

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Where n  represents the index of refraction and θ represents the angle of the incident and exiting light ray. A classic example demonstrating refraction is the visual distortion that occurs when a pencil is submerged in a glass of water.

In this study, physicists used atoms to measure the propagation of laser beams. They did this by changing the laser light in a specific way called elliptical polarization. Illumination of atoms by laser beam changes their state in a significant way. It is possible to measure those changes with high precision.

image credit:  By Meganbeckett27  Pencil in glass showing refraction [CC BY-SA 3.0 (https://creativecommons.org/licenses/by-sa/3.0)], from Wikimedia Commons

In 1953, Dutch scientist Bram van Heel first demonstrated image transmission through bundles of optical fibers with a transparent cladding.

Fiber optic lighting utilizes optical fiber (flexible fiber made of glass or plastic) to transmit light from a light source to a remote location.  It is comprised of a core and cladding (coating) that trap light, allowing light to travel long distances.

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Maybe you have been lucky enough to see the fiber optic starry ceiling in the cabin of Emirates newly redesigned Boeing 777 or in the interior ceiling of a Rolls-Royce Phantom.

During the interaction of atoms, atoms often exhibit unusual behavior due to their quantum behavior. The effect can be used to develop quantum computers, solving specific problems that conventional computers struggle with.

As light transfers from air, which has a refractive index (RI) of 1.0, to water, which has an RI of 1.33, the light bends.

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“In this way, the researchers succeeded, for example, in adjusting four laser beams so that they intersected at exactly the desired position. Such an adjustment would normally take several weeks, and you would still have no guarantee that the optimum had been reached. With our process, we only needed about one day to do this.”

Refraction occurs when a light ray passes from one medium to another. As it crosses the boundary, the light ray will bend. The angle of this bend is determined by the difference in the index of refraction of the two mediums. This is governed by Snell’s Law:

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“But that’s not all—you have to do it blindfolded. This is because quantum experiments occur in an almost perfect vacuum, where the laser beams are invisible.”

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Fiber optics are one of the most significant inventions in our history. Currently more than 2 billion kilometers of optical fiber is deployed around the world.

Dr. Andrea Alberti, who led the study at the Institute of Applied Physics at the University of Bonn, said, “This task is less trivial than it sounds. For one thing, it requires great accuracy. It’s kind of like having to aim a laser pointer from the stands of a soccer stadium to hit a bean that’s on the kickoff spot.”

We use fiber optics in many diverse applications. From delivering phototherapeutic light to treat babies with Jaundice, or allowing spinal surgeons to visualize deep in cavities, to backlighting components found in automobiles, keyboards, and even shoes.

However, such experiments need maneuvering individual atoms into exactly the right position. This task is performed by using laser beams that serve as conveyor belts of light.

The second coating layer has a lower RI than the cladding to ensure that any stray light that makes its way into the cladding is reflected back into the core. The cable is then wrapped in a strong covering, such as Kevlar, and then covered with a thick cable jacket to protect it from the environment. The buffer zone isolates the fiber optic from the stresses in the cable.

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Gautam Ramola, the study’s lead author, said, “If you want to move the atoms in different directions, you usually need many of these conveyor belts. When more atoms are transported to the same location, they can interact with each other. For this process to take place under controlled conditions, all pockets of the conveyor belt must have the same shape and depth. To ensure this homogeneity, the lasers must overlap with micrometer precision.”

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While traveling through the vacuum, laser beams are invisible unless shot directly into your eye. But, now, physicists make laser beams visible in a vacuum by developing a method that makes it easier to perform the ultra-precise laser alignment required to manipulate individual atoms.

Now by this same principle, if a light ray is traveling through water and encounters a medium with a lower RI such as air, it will refract out as long as the angle of incidence is below a certain value called the critical angle. If the angle of incidence is above this critical angle, it will reflect back into the water.

If the light ray was in the air and it encounters a higher RI such as water, it will always refract into higher RI. An additional note is that in reality some light will always reflect and some light will always scatter when interfacing a boundary.

In 1880, William Wheeler invented a system of glass light pipes lined with a highly reflective coating that illuminated homes by using light from an electric arc lamp placed in the basement and directing the light around the home with the pipes. While this accomplishes the same goal, this is not a fiber optic because it does not use TIR.

It’s an interesting question because there were many people with significant contributions that advanced our understanding of light transmission that led to the fiber optic we have today.

As a company, we engineer light where it is needed and create solutions that have a positive impact on life. We have brought many innovations to the fiber optic backlighting world in the Medical, Transportation, and Electronics markets. One is the integration of light into medical tools.

In 1964, Charles Kao and George Hockham published a pivotal paper that defined TIR and proposed that attenuation in fibers at that time was caused by impurities in the glass. At this time, the impurities in the silica and lack of a practical method of manufacturing had prevented long-term communication for breaching reality.

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By the end of the century, more than 80 percent of the world's long-distance traffic was carried over fiber optic cables.

The invention of our Woven Fiber Optic™ technology (flexible, lit fabric) occurred over 30 years ago in a garage using a repurposed loom. We have since refined this technology and invented different ways of delivering light.

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If you coat the core with a perfect mirror, it would reflect and transmit the light but in reality, a perfect mirror is difficult to achieve. It would be very expensive and you could end up with an imperfect mirror that would lead to a lot of absorption and scattering. A cladding layer is a much more practical approach.

Such a conveyor belt of light contains countless pockets, each of which can hold a single atom. It is possible to move those pockets back and forth- allowing an atom to be transported to a specific location in space.

To understand how light propagates through an optical fiber, you need to understand two basic concepts: refraction and total internal reflection.