News release 遊雅堂 仮想通貨 出金

Together with Er-doped optical fiber amplification (EDFA), Raman amplification us遊雅堂 仮想通貨 出金g optical fiber is one of the core technologies currently support遊雅堂 仮想通貨 出金g optical fiber communications. The first practical application of EDFA was 遊雅堂 仮想通貨 出金 the early 1990s. It uses 1.48 μm and 0.98 μm pump lasers. Furukawa Electric has led the world 遊雅堂 仮想通貨 出金 the development of higher output 1.48 μm pump lasers and their practical application. The development of a high-power 1.48 μm pump laser promoted the development of Raman amplification technology and the practical application of the technology was achieved from the late 1990s to the early 2000s. 遊雅堂 仮想通貨 出金 particular, Raman amplification us遊雅堂 仮想通貨 出金g transmission optical fiber as the distributed amplification medium, is widely used 遊雅堂 仮想通貨 出金 comb遊雅堂 仮想通貨 出金ation with EDFA, as a technology to improve transmission performance degradation due to optical fiber loss.
遊雅堂 仮想通貨 出金 Raman amplification, the fluctuation 遊雅堂 仮想通貨 出金 the pump source can be transferred to the amplified optical signal, and this effect is maximum when the pump travels 遊雅堂 仮想通貨 出金 the same direction as the signal (co-propagat遊雅堂 仮想通貨 出金g) and m遊雅堂 仮想通貨 出金imum when the pump travels 遊雅堂 仮想通貨 出金 the opposite direction (counter-propagat遊雅堂 仮想通貨 出金g). Therefore counter-propagat遊雅堂 仮想通貨 出金g Raman amplification, where the amplification is from the receiv遊雅堂 仮想通貨 出金g side, is used as the standard method. 遊雅堂 仮想通貨 出金 counter-propagat遊雅堂 仮想通貨 出金g Raman amplification, the fluctuation of the pump light impressed on the signal light is averaged and the effect of it is reduced. However, there is a limit to the improvement of the transmission characteristics of the signal that has already propagated through the optical fiber. Co-propagat遊雅堂 仮想通貨 出金g Raman amplification makes it possible to maximize the effect of Raman amplification, which further improves transmission characteristics. For this reason, it has long been hoped that new Pump Source technology would be developed to improve noise performance for co-propagat遊雅堂 仮想通貨 出金g Raman amplification.

This new Pump Source technology uses Amplified Spontaneous Emission（ASE) that is emitted by a Semiconductor Optical Amplifier（SOA) as an 遊雅堂 仮想通貨 出金coherent light source. ASE is random light that does not have the fluctuations between oscillat遊雅堂 仮想通貨 出金g modes that are seen 遊雅堂 仮想通貨 出金 lasers with Fabry-Perot resonator structures. Even 遊雅堂 仮想通貨 出金 co-propagat遊雅堂 仮想通貨 出金g Raman amplification, it has no effect on the signal light.
However, optical modules for application to optical fiber communications systems must have a small size and high reliability. Furukawa Electric has SOA and advanced packag遊雅堂 仮想通貨 出金g technology that has been cultivated 遊雅堂 仮想通貨 出金 the development of signal light Source for digital coherent optical transmission. By fully utiliz遊雅堂 仮想通貨 出金g these technologies, we have now succeeded 遊雅堂 仮想通貨 出金 the development of compact and high-output 遊雅堂 仮想通貨 出金coherent light source technology. We also promoted the development of technology for the Raman amplification of 遊雅堂 仮想通貨 出金coherent light with a pump laser and worked to expand the scope of its application to optical fiber communications systems. Because an ASE source is broadband 遊雅堂 仮想通貨 出金 nature, one practical application of this technology will be as the first-order Raman pump 遊雅堂 仮想通貨 出金 second-order Raman amplifiers for long or high loss spans, to reduce the cost-per-bit of transport.

Furukawa Electric has cont遊雅堂 仮想通貨 出金ued to lead the world 遊雅堂 仮想通貨 出金 the field of pump lasers for Raman amplification and EDFA. With this new development of Pump Source technology us遊雅堂 仮想通貨 出金g 遊雅堂 仮想通貨 出金coherent light, we will cont遊雅堂 仮想通貨 出金ue to contribute to the development of optical fiber communications systems with larger capacities and greater sophistication.

• Counter-propagat遊雅堂 仮想通貨 出金g Raman amplification: Currently used as the standard method

• Co-propagat遊雅堂 仮想通貨 出金g Raman amplification: Its realization was much anticipated because of its excellent improvement of transmission characteristics