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With the high-speed transmission technology in the current network applications, long-distance transmission technology development is also of concern, especially after the current commercial 100G technology, 400G, 1T transfer rate has been put on the agenda, based on the existing technological development route, long-distance transmission capacity limitation can be challenged, to ensure long-distance transmission of the optical signal intensity, while extending the transmission capacity of long-haul optical communication field has become an important issue.
Bell Labs has now developed to break this limitation breakthrough technology, through the "phase conjugate light," significantly reduces fiber nonlinear optical effect caused by signal degradation. It is understood that Bell Labs used the technology transfer eight multiplexed optical signals of different wavelengths of long-haul optical communication systems, confirm that a 12,800 km-long fiber with 406.6Gbit / sec transfer capacity.
This figure is useful in the current transmission capacity of the same date, it is worth mentioning that, in contrast, the use of new technology of higher quality optical signal, or simply a smaller intensity of the optical signal.
Technological bottlenecks
From the existing long-distance transmission technology development, the long-distance transmission capacity and transmission technology to enhance the signal strength have been close to the limit, especially from the current network 100G technology point of view, operators have faced the question how to reduce non-linear effects , including the use of low-loss, low loss optical fiber in order to reduce transmission losses, with more high-speed transmission technology further application, the transmission capacity to achieve the ultimate level of technology will become a major bottleneck.
It is understood that long-distance optical communication through wavelength division multiplexing (WDM) technology allows dozens of different wavelengths of light through an optical fiber, the fiber may be because of the heat and melt. At the same time, the current may pass through a single fiber optical output power is about 1.2 ~ 1.4W, if not non-linear optical effect, 100Tbit / s transmission capacity is a limit.
The latest submarine cable transmission capacity of 3.5Tbit / s, this capacity has basically become a traditional long-distance transmission technology capacity limit, now more and more focused on how technical experts from the basic level to break this limit.
Phase conjugate light
Represents the phase conjugate light from the light source of the light emitted by the phase conjugate mirror and follow the original path of the light reflected back toward the source.
Phase conjugate light amplitude and frequency of the light is the same as the original, just in the opposite direction of light propagation. Compared with conventional reflected light, the phase conjugate light only eliminates signal distortion, and chromatic dispersion, phase noise, etc. will therefore disappear. Conventional optical transmission, the optical signal passes through a series of reflection for light transmission, the transmission of the optical signal attenuation, etc. nonlinear effects are present, and by the phase conjugate light transmission, can effectively eliminate a series of nonlinear effects.
It is understood that the phase conjugate light of research has been going on a long time, while in the field of optical communication has been studied, but because the process requires special transmission repeaters, thus practical low.
Bell Labs this innovative technology is proposed using a phase conjugate light, enabling the existing fiber can also be reduced due to the nonlinear optical effect causes signal distortion.
The communication system proposed by Bell Labs repeater is not necessary.
The optical signal transmission system, can also transmit the optical signal A normal phase conjugate light and the optical signal A.
Although any one light signal appears on the transmission path are deteriorated, but are subject to signal distortion A major component of the A signal encoding and opposite the main component of the distortion. That is, A and A synthesized signal will cancel each other most of the distortion.
Bell Labs has now developed to break this limitation breakthrough technology, through the "phase conjugate light," significantly reduces fiber nonlinear optical effect caused by signal degradation. It is understood that Bell Labs used the technology transfer eight multiplexed optical signals of different wavelengths of long-haul optical communication systems, confirm that a 12,800 km-long fiber with 406.6Gbit / sec transfer capacity.
This figure is useful in the current transmission capacity of the same date, it is worth mentioning that, in contrast, the use of new technology of higher quality optical signal, or simply a smaller intensity of the optical signal.
Technological bottlenecks
From the existing long-distance transmission technology development, the long-distance transmission capacity and transmission technology to enhance the signal strength have been close to the limit, especially from the current network 100G technology point of view, operators have faced the question how to reduce non-linear effects , including the use of low-loss, low loss optical fiber in order to reduce transmission losses, with more high-speed transmission technology further application, the transmission capacity to achieve the ultimate level of technology will become a major bottleneck.
It is understood that long-distance optical communication through wavelength division multiplexing (WDM) technology allows dozens of different wavelengths of light through an optical fiber, the fiber may be because of the heat and melt. At the same time, the current may pass through a single fiber optical output power is about 1.2 ~ 1.4W, if not non-linear optical effect, 100Tbit / s transmission capacity is a limit.
The latest submarine cable transmission capacity of 3.5Tbit / s, this capacity has basically become a traditional long-distance transmission technology capacity limit, now more and more focused on how technical experts from the basic level to break this limit.
Phase conjugate light
Represents the phase conjugate light from the light source of the light emitted by the phase conjugate mirror and follow the original path of the light reflected back toward the source.
Phase conjugate light amplitude and frequency of the light is the same as the original, just in the opposite direction of light propagation. Compared with conventional reflected light, the phase conjugate light only eliminates signal distortion, and chromatic dispersion, phase noise, etc. will therefore disappear. Conventional optical transmission, the optical signal passes through a series of reflection for light transmission, the transmission of the optical signal attenuation, etc. nonlinear effects are present, and by the phase conjugate light transmission, can effectively eliminate a series of nonlinear effects.
It is understood that the phase conjugate light of research has been going on a long time, while in the field of optical communication has been studied, but because the process requires special transmission repeaters, thus practical low.
Bell Labs this innovative technology is proposed using a phase conjugate light, enabling the existing fiber can also be reduced due to the nonlinear optical effect causes signal distortion.
The communication system proposed by Bell Labs repeater is not necessary.
The optical signal transmission system, can also transmit the optical signal A normal phase conjugate light and the optical signal A.
Although any one light signal appears on the transmission path are deteriorated, but are subject to signal distortion A major component of the A signal encoding and opposite the main component of the distortion. That is, A and A synthesized signal will cancel each other most of the distortion.
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