Fujikura Ltd.

Optical

It is a technology platform that produces optical-related technologies such as our company's flagship product, "Optical fiber/Optical fiber cable". In recent years, we have applied a wide range of optics-related technologies cultivated in optical fibers for communications to conduct research and development in fields other than telecommunications.

Optical Communication Technology

Technology related to "Telecommunication" within the technology platform “Optical”. We are contributing to the construction of optical information and telecommunications networks, which are indispensable for the modern ICT society, including our company's flagship product, "Optical fiber/Optical fiber cable".

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Optical Component

Optical Component

With the spread of data centers and 5G, the construction of optical fiber networks is progressing rapidly in countries all over the world. For this purpose, connection technology for connecting optical fibers is necessary, and various connection technologies have been developed according to applications such as connector connection, fusion connection, and mechanical splice. Especially in the case of outdoor connection, a connection technology called FA (Field Assembly) connector (Fig. 1) has been developed because simple connection in the field and high reliability are required. The FA connector consists of a ferrule with internal fiber bonded, fixed and polished at the factory. It is connected by a mechanical splice (FIG. 2) to an optical fiber that has been processed in the field. The mechanical splice comprises a V-groove substrate, an upper lid, and a U-shaped spring, and when the optical fibers are connected, a wedge is inserted from the side of the mechanical splice, and the opposed optical fibers are connected by pushing each other. Then, the wedge is pulled out to be mechanically fixed by a U-shaped spring. A refractive index matching gel is used between the end faces of the connected optical fibers to avoid Fresnel reflection. There is no adhesive and polishing process to assemble a mechanical splice in the field, and it is also unnecessary a power supply for the assembly. For the reliability of the optical fiber network, how the optical fiber is stored and maintained after it is connected is very important, and it is necessary to ensure the long-term reliability in various environments in the field such as rain, wind, and ultraviolet rays. FIG. 3 is a connector connection housing case, which is constructed of a plastic housing and a rubber packing, and has an economical structure that ensures long-term reliability.

Figure 1. FA Connector Structure

1) internal structure 2) wedge insertion

Figure 2. Mechanical Splice

Figure 3. Drop Connecting Case

Optical Connector

Optical Connector

Optical connectors are products that realize low-loss, high-reliability repeated connections by precisely aligning optical fibers with each other and bringing the end faces close or in contact. Optical connectors are applied from single-fiber connections to multi-fiber bulk connections with multiple connection method. Fujikura has core technologies for each connection method, and provides a variety of solutions to meet customer needs.
Physical contact (Fig. 1) is a method in which optical fiber end faces are physically brought into contact with each other. Fujikura has made progress in reducing the loss and increasing the number of cores of optical connectors through high-precision polishing technology and precision molding technology. We also offer field assembled optical connector (Figure 2) solutions that combine physical contact with refractive index matching and fused connections.
In recent years, with the increase of traffic in optical transmission equipment or advances in silicon photonics technology, the proximity and non-contact connection of optical fibers in optical modules or devices has attracted greater attention. Fujikura is developing solutions in these new fields, such as butt joint connection technology (Fig. 3) which realizes optical coupling by adjusting the mode field of optical fibers for optical devices, and lens connection technology (Fig. 4) which combines free-space optical design with optical resin molding technology.

Figure 1: Physical Contact Connection for Single-Fiber, Multi-Fiber Connectors
   (Left: Schematic; Right-Top: LC connector (single-fiber); Right-Bottom: MPO connectors (multi-fiber)

Figure 2: Example of a Field Assembly Connector (Left: Fused MPO connectors; Right: Index-matched single-fiber connectors)

Figure 3: Example of an MFD Converter Butt Joint (Top: Diagram of connection part, Bottom: Appearance of product)

Figure 4: Example of a Lens Connection (Left: Lensed MPO connector; Right: Cross section view)

Optical Fiber Fusion Splicer

Optical Fiber Fusion Splicer

We are engaged in research and development of equipment to remove coating, cut and splice optical fibers. The core position of an optical fiber is measured with high accuracy, and two optical fibers are aligned at the submicron level by a precise axis alignment mechanism, and then spliced by quasi-corona discharge or CO2 laser. Fusion splicers using quasi-corona discharge with tungsten electrode can be miniaturized and is mainly used for splicing optical fiber for telecommunication. On the other hand, fusion splicers that use CO2 lasers do not have tungsten adhered to optical fibers, and are mainly used for processing specialty optical fibers. The characteristics of CO2 lasers are utilized not only in splicing but also in tip lens processing and optical coupler manufacturing. Our splicer, which makes full use of mechatronics technology, has the world's top share.

12-fiber Mass Fusion Splicer 12-fiber fusion splicing by discharge Laser Fusion Splicer Fusion splicing type ball lens
Optical Fiber Cable

Optical Fiber Cable

We have developed Spider Web Ribbon® (SWR®) in which the intermittently bonded fibers are flexible to form bundle compared to conventional ribbon structure, and Wrapping Tube Cable® (WTC®), which is a cable made by bundling and effectively packing the SWRs. Thanks to the innovative technologies of SWR and WTC, we have succeeded in the development of ultra-high density optical cables with the world's highest core count. This technology was awarded the "ICT Business Development Prize" by The Telecommunications Association of Japan, and is contributing to the construction of optical communications networks not only in Japan but also around the world. Using SWR & WTC, we are developing ultra-high density optical fiber cables and components to support large-capacity optical communications, as well as high-performance optical fiber cables tailored to applications in countries around the world.

Optical Fiber

Optical Fiber

Optical fiber networks are essential backbones for providing next-generation wireless environments such as fifth generation mobile communication systems (5G). Optical fibers play a central role in technologies supporting high-speed and high-capacity transmission. Almost all optical fibers are used as optical fiber cords or high-fiber-count optical fiber cables. In order to improve the efficiency of installing optical fibers and to make effective use of the space for laying the optical fiber cables, optical fiber manufacturers are competing with each other to develop optical fiber cables with higher density, lighter weight and smaller diameter.
Fujikura has already released ultra-high density and high fiber count cables with our proprietary 12 core intermittently fixed optical fiber ribbons,
Spider Web Ribbon ®. We are also advancing the technology and developing ultra-high density and high fiber count cables with thinner-than-standard fibers with a coating diameter of 200 μm. We are also developing multicore fibers that can achieve higher density by sharing the cladding area.
Fujikura has the technology to design and manufacture optical fibers with as many as over 30 cores. In November 2016, we received the Horizon Prize for our research on optical fiber transmission using our ultra-high core count multicore fibers, in collaboration with the Technical University of Denmark and the University of Southampton.

Horizon Prize

Based on our design and manufacturing technologies, Fujikura is pushing forward with research and development focusing on four-core fibers that are optically compatible with existing single-mode fibers, with the same cladding diameter (125 μm) as the most commonly used optical fibers, for early commercialization.


Example of multicore fiber

For inquiries regarding research and development, please contact us from here.

Fiber Laser Technology

We are developing world-class high-power laser diodes, specialty fibers such as rare-earth-doped optical fibers, and elemental technologies such as fiber-optic components, as well as fiber laser oscillators by integrating these technologies. Research and development of high-power continuous-wave single-mode fiber lasers with excellent beam quality is drawing attention from around the world, receiving numerous business achievement awards and invited lectures at laser-related academic societies and international conferences both in Japan and overseas.
In addition to the research and development of single-mode fiber lasers, we are also focusing on the development of new products and technologies to support the improvement of performances, functions and costs of continuous-wave high-power multimode fiber lasers used in metal cutting and welding, and pulse fiber lasers used in marking and micromachining.
In the future, in addition to the development of fiber laser oscillators, we will promote research on fiber laser applications and contribute to the further spread of fiber lasers.

330 W output Fiber-Coupled laser Diode Module External view of a prototype high-power continuous-wave single-mode fiber laser Appearance of pulse-oscillating
fiber laser product
Metal cutting by multimode fiber laser

For inquiries regarding research and development, please contact us from here.

Optical Sensing Technology

We are researching and developing optical application sensing technology by applying a wide range of optical technologies cultivated in optical fibers for telecommunications. our company possesses a number of technologies that enable it to propose products that meet customer needs, such as "Image fiber" "Miniature CMOS image sensor module for Endoscope" and "Optical fiber sensor".

Related technology

Image Fiber

Image Fiber

An image fiber is an optical fiber that transmits an image formed on a fiber end surface to the other end through a lens, and it is used in industrial applications and medical endoscopes that observe the inside of the human body.
Fujikura's image fiber is silica glass based image fiber and have the largest share in the world market. These products have the unique properties that utilizes the sophisticated optical fiber design and the manufacturing technologies over many years.
On this time, the high-resolution image fiber has been developed in accordance with the customer requests for higher image quality. That has approximately three times the number of pixels while maintaining the outer diameter of the fiber.
The high-resolution has been achieved by applying the shorter distance from pixel to pixel, which is difficult with standard image fibers.
And, by optimizing the entire design, the color reproducibility has succeed to keep as almost same as standard products.
The good reputation for this product has been already received from customers in the industrial and medical fields, and this new product is hoped to further contribute to the visualization technology of narrow places, which has been difficult to observe up to now.
Fujikura is going to challenge the new technology and to contribute to society by utilizing its optical fiber technology.

Color picture of high-resolution image fiber

Resolution comparison (Red circles show lines at interval of 4.4 μm)

Miniature CMOS image sensor module for Endoscope

Miniature CMOS image sensor module for Endoscope

Fujikura has realized an ultra-thin camera module that revolutionizes the medical technology by combining in-house technologies such as optical, micro-coaxial cable and micro-assembly technologies.
The camera module realized 1.4mm diameter with 160,000 pixel image quality as well as high flexibility and this technology becomes possible to take clear images of affected area inside body directly with less pain and minimum-invasion which were not enable with existing technologies.
The camera module provides a very low cost that can be also used for single-use video endoscope to avoid the risk of secondary infections.

Miniature CMOS image sensor module for Endoscope
Optical Fiber Sensor

Optical Fiber Sensor

Fiber-optic sensing is a technology that utilizes an optical fiber itself as a sensor by taking advantage of its characteristics in which various parameters of light propagating in the fiber change in response to temperature, strain, magnetic field, and other factors. A typical example of such an optical fiber sensor is an optical fiber gyro that measures angular velocity and has been put to practical use in the aerospace field. In recent years, sensors for measuring shapes and dimensions in addition to temperature, strain, and magnetic fields have been proposed. This allows the sensors to find wide application in the social infrastructure such as bridges and tunnels, nuclear facilities, natural resource mining sites, and medical equipment.
The examples of our R & D on optical fiber sensors include an optical fiber sensor flight demonstration project conducted by the Japan Aerospace Exploration Agency (JAXA) in fiscal 2016 and 2017. An optical fiber sensor developed by our company was mounted on an experimental aircraft named Hisho, and the sensor succeeded in measuring the strain generated in the aircraft in flight in real time.

Outline of the Optical Fiber Sensor Flight Demonstration Project in 2016 and 2017 (Materials provided by JAXA)

For inquiries regarding research and development, please contact us from here.

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