1/4/2018, Corning TXF 
Fiber is a new type of fiber designed for long-distance transmission of terrestrial high-speed systems. As the rate of data traffic continues to increase, 100G/s systems have been widely deployed in long-haul transmission networks. In some regions, 200G/s systems have begun to be applied, and 400G/s systems have also begun to emerge. Upgrading to high transmission rates requires higher optical signal-to-noise ratio (OSNR). Compared to traditional single-mode fibers, TXF fibers have ultra-low loss and large effective area characteristics, which can significantly improve the optical signal-to-noise ratio of the system.
The challenge of increasing transmission rate
Network operators are faced with the huge challenge of continuous data capacity growth. Users have become accustomed to enjoying high-traffic video services using reliable low-latency transmission networks. As the price of connected devices and services declines, more and more users use content access services. In addition, the Internet of Things connects machines and sensors and wearable devices to each other and communicate with each other. It is estimated that by 2020, the number of devices in the Internet of Things will exceed 50 billion. The rise of the Internet of Things requires the transmission network to increase capacity to meet the needs of the Internet of Things.
Increasing channel speed is the most common way to upgrade your system. The current long-distance transmission system is gradually upgraded from 10Gb/s to 100Gb/s, 200Gb/s, and even 400Gb/s. The modulation mode requirements of the system are getting higher and higher, which is more strict on the system optical signal-to-noise ratio (OSNR). Claim. The system can achieve error-free operation only when the signal is much higher than the noise, but the loss of the link and the accumulation of nonlinear effects will degrade the signal, thus affecting the transmission distance of the system.
The research results show that (Note: the actual achievable distance depends on the design rules of the actual network), and the transmission distance is obviously improved when 100Gb/s (using PM-QPSK modulation) is upgraded to 200Gb/s (using PM-16QAM modulation). decline. The 100Gb/s system can reach distances of several thousand kilometers, meeting the needs of long-distance transmission on land. However, the transmission distance of 200Gb/s is reduced to several hundred kilometers, and long-distance transmission requires expensive signal regeneration equipment. So if you upgrade to a larger capacity, higher spectrum efficiency system, operators may need to take on more capital expenditures to build additional relay stations to address transmission capacity and distance issues.
Advantages and characteristics of new fiber
The innovative design of the fiber helps to increase the optical signal-to-noise ratio of the system and extend the transmission distance of high-speed systems. Two key features of the fiber are ultra low loss and large effective area. A conventional single mode fiber uses an erbium doped silica core with a typical attenuation value of ≦0.20 dB/km at a wavelength of 1550 nm. Low-loss fibers typically have attenuation values ​​of ≦0.18dB/km@1550nm. These fibers are also erbium-doped silica cores that are implemented by advanced fiber drawing processes. To further reduce the fiber attenuation to ≦0.17dB/km, it is necessary to use a pure silica core instead of the erbium-doped core. Ultra-low loss pure silicon fiber can more effectively maintain the optical power in the core and extend the signal transmission distance. The typical attenuation value of Corning TXF fiber is 0.168dB/km@1550nm.
The large effective area is achieved by increasing the core size of the optical signal transmission, allowing the input of higher optical power into the fiber, which is another way to extend the transmission distance. The large effective area will spread the optical power in the core more dispersedly and reduce the center peak power density, which is very important for a wavelength division multiplexing (WDM) transmission system with dozens of channels. Once the power density of the incident signal exceeds a certain threshold, it is easy to cause nonlinear distortion of the signal (such as four-wave mixing, self-phase modulation, cross-phase modulation). Dispersing optical power into a large effective area core allows transmission to receive greater optical power before reaching a non-linear threshold. The typical effective area of ​​Corning TXF fiber is 125μm2.
We typically use the quality factor (FOM) to evaluate the transmission performance of different fibers. This approach compares the advantages of this fiber to a reference fiber (usually the standard G.652.D fiber). We compared several different terrestrial long-distance transmission fibers, the results of which are shown in Figure 2. The FOM on the y-axis is a Q-factor increment relative to the standard G.652.D fiber and can be understood as an increase in transmission distance. The 1dB advantage corresponds to a distance increment of ~25%, the 2dB advantage corresponds to a distance increment of ~60%, and the 3dB advantage corresponds to a distance increment of ~100%. Compared to other long-haul transmission fibers, Corning TXF fiber provides the best transmission performance and provides the margin for upgrading to higher speed systems.
ITU-TG.654E specification
“ITU-TG.654 Specification Cut-Off Displacement Single-Mode Fiber and Cable†– This standard was developed in ITU-T 1998 and periodically revised. This standard describes the characteristics of G.654 fiber: a larger effective area than conventional G.652 fiber, the cutoff wavelength can be shifted below 1530 nm, with minimal attenuation at 1550 nm. The AD subclass of this standard describes the typical fiber used in submarine cables. It must have low loss and large effective area characteristics to provide efficient connection for trans-oceanic distance transmission. In September 2016, the latest version of the G.654 standard was adopted, and the E subclass was added to standardize the cut-off wavelength displacement large effective area fiber for terrestrial long-distance large-capacity high-rate transmission networks, further narrowing the effective area. The range improves the bending performance of the fiber to the G.652 level. Corning TXF fiber fully meets the ITU-TG.654.E specification.
Fiber is a new type of fiber designed for long-distance transmission of terrestrial high-speed systems. As the rate of data traffic continues to increase, 100G/s systems have been widely deployed in long-haul transmission networks. In some regions, 200G/s systems have begun to be applied, and 400G/s systems have also begun to emerge. Upgrading to high transmission rates requires higher optical signal-to-noise ratio (OSNR). Compared to traditional single-mode fibers, TXF fibers have ultra-low loss and large effective area characteristics, which can significantly improve the optical signal-to-noise ratio of the system. The challenge of increasing transmission rate
Network operators are faced with the huge challenge of continuous data capacity growth. Users have become accustomed to enjoying high-traffic video services using reliable low-latency transmission networks. As the price of connected devices and services declines, more and more users use content access services. In addition, the Internet of Things connects machines and sensors and wearable devices to each other and communicate with each other. It is estimated that by 2020, the number of devices in the Internet of Things will exceed 50 billion. The rise of the Internet of Things requires the transmission network to increase capacity to meet the needs of the Internet of Things.
Increasing channel speed is the most common way to upgrade your system. The current long-distance transmission system is gradually upgraded from 10Gb/s to 100Gb/s, 200Gb/s, and even 400Gb/s. The modulation mode requirements of the system are getting higher and higher, which is more strict on the system optical signal-to-noise ratio (OSNR). Claim. The system can achieve error-free operation only when the signal is much higher than the noise, but the loss of the link and the accumulation of nonlinear effects will degrade the signal, thus affecting the transmission distance of the system.
The research results show that (Note: the actual achievable distance depends on the design rules of the actual network), and the transmission distance is obviously improved when 100Gb/s (using PM-QPSK modulation) is upgraded to 200Gb/s (using PM-16QAM modulation). decline. The 100Gb/s system can reach distances of several thousand kilometers, meeting the needs of long-distance transmission on land. However, the transmission distance of 200Gb/s is reduced to several hundred kilometers, and long-distance transmission requires expensive signal regeneration equipment. So if you upgrade to a larger capacity, higher spectrum efficiency system, operators may need to take on more capital expenditures to build additional relay stations to address transmission capacity and distance issues.
Advantages and characteristics of new fiber
The innovative design of the fiber helps to increase the optical signal-to-noise ratio of the system and extend the transmission distance of high-speed systems. Two key features of the fiber are ultra low loss and large effective area. A conventional single mode fiber uses an erbium doped silica core with a typical attenuation value of ≦0.20 dB/km at a wavelength of 1550 nm. Low-loss fibers typically have attenuation values ​​of ≦0.18dB/km@1550nm. These fibers are also erbium-doped silica cores that are implemented by advanced fiber drawing processes. To further reduce the fiber attenuation to ≦0.17dB/km, it is necessary to use a pure silica core instead of the erbium-doped core. Ultra-low loss pure silicon fiber can more effectively maintain the optical power in the core and extend the signal transmission distance. The typical attenuation value of Corning TXF fiber is 0.168dB/km@1550nm.
The large effective area is achieved by increasing the core size of the optical signal transmission, allowing the input of higher optical power into the fiber, which is another way to extend the transmission distance. The large effective area will spread the optical power in the core more dispersedly and reduce the center peak power density, which is very important for a wavelength division multiplexing (WDM) transmission system with dozens of channels. Once the power density of the incident signal exceeds a certain threshold, it is easy to cause nonlinear distortion of the signal (such as four-wave mixing, self-phase modulation, cross-phase modulation). Dispersing optical power into a large effective area core allows transmission to receive greater optical power before reaching a non-linear threshold. The typical effective area of ​​Corning TXF fiber is 125μm2.
We typically use the quality factor (FOM) to evaluate the transmission performance of different fibers. This approach compares the advantages of this fiber to a reference fiber (usually the standard G.652.D fiber). We compared several different terrestrial long-distance transmission fibers, the results of which are shown in Figure 2. The FOM on the y-axis is a Q-factor increment relative to the standard G.652.D fiber and can be understood as an increase in transmission distance. The 1dB advantage corresponds to a distance increment of ~25%, the 2dB advantage corresponds to a distance increment of ~60%, and the 3dB advantage corresponds to a distance increment of ~100%. Compared to other long-haul transmission fibers, Corning TXF fiber provides the best transmission performance and provides the margin for upgrading to higher speed systems.
ITU-TG.654E specification
“ITU-TG.654 Specification Cut-Off Displacement Single-Mode Fiber and Cable†– This standard was developed in ITU-T 1998 and periodically revised. This standard describes the characteristics of G.654 fiber: a larger effective area than conventional G.652 fiber, the cutoff wavelength can be shifted below 1530 nm, with minimal attenuation at 1550 nm. The AD subclass of this standard describes the typical fiber used in submarine cables. It must have low loss and large effective area characteristics to provide efficient connection for trans-oceanic distance transmission. In September 2016, the latest version of the G.654 standard was adopted, and the E subclass was added to standardize the cut-off wavelength displacement large effective area fiber for terrestrial long-distance large-capacity high-rate transmission networks, further narrowing the effective area. The range improves the bending performance of the fiber to the G.652 level. Corning TXF fiber fully meets the ITU-TG.654.E specification.
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